Journal of Asian Earth Sciences: X最新文献_第3页

Fate of the Late Triassic Songpan-Ganzi Basin in the eastern Paleo-Tethys Ocean: Geochemical and geochronological constraints in the NE Tibetan Plateau 古特提斯洋东部晚三叠世松潘-甘孜盆地的命运：青藏高原东北缘的地球化学和年代学约束

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Journal of Asian Earth Sciences: X Pub Date : 2025-06-01 Epub Date: 2025-03-30 DOI: 10.1016/j.jaesx.2025.100194

Hong-Xu Mu , Dan-Ping Yan , Liang Qiu , Ruo-Yan Kong , Ling-Xiao Gong

{"title":"Fate of the Late Triassic Songpan-Ganzi Basin in the eastern Paleo-Tethys Ocean: Geochemical and geochronological constraints in the NE Tibetan Plateau","authors":"Hong-Xu Mu , Dan-Ping Yan , Liang Qiu , Ruo-Yan Kong , Ling-Xiao Gong","doi":"10.1016/j.jaesx.2025.100194","DOIUrl":"10.1016/j.jaesx.2025.100194","url":null,"abstract":"<div><div>The Songpan-Ganzi Basin in the northeastern Tibetan Plateau preserves well-developed Late Triassic flysch sequences, making it an ideal region for investigating the provenance and tectonic evolution of the basin. This study aimed to constrain the provenance and tectonic setting of the basin by analyzing whole-rock geochemistry and detrital zircon U-Pb ages from Late Triassic flysch sediments. The flysch sequences show low SiO<sub>2</sub> (average 51.16 wt%), Al<sub>2</sub>O<sub>3</sub> (average 9.85 wt%) and Fe<sub>2</sub>O<sub>3</sub><sup>T</sup> + MgO (average 6.56 wt%) values, and K<sub>2</sub>O/Na<sub>2</sub>O (average 2.71) ratios, along with high SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratios (averaging 6.99), suggesting a continental arc setting. They also exhibit moderate chemical weathering (CIA: 60.32–83.72) and high component variability (0.9–2.34, average 1.61), revealing a moderately weathered source. Tectonic discrimination diagrams based on La-Sc-Th and Th-Sc-Zr/10 ratios suggest a continental arc setting. U-Pb ages of detrital zircons mainly range from 222 to 300 Ma and 450 to 520 Ma, reflecting the time of the emplacement of Paleozoic to Late Triassic plutons in the Qinling orogenic belt and Kunlun arc. Minor age peaks (720–850 Ma, 950–1300 Ma and 1400–2400 Ma) suggest subordinate contribution from the northern and western margins of the Yangtze Block. Cumulative proportion curves of zircon U-Pb ages for lower formations exhibit a steep accumulation trend, suggesting a convergent tectonic setting. In contrast, upper formations display a relatively flat accumulation curve, indicative of a collisional environment. This shift in curve characteristics suggests that the sedimentary environment evolved from convergent to collisional settings among the North China, South China, and Qiangtang blocks.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100194"},"PeriodicalIF":1.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing the performance of machine learning and analytical hierarchy process (AHP) models for rainwater harvesting potential zone identification in hilly region, Bangladesh 评估机器学习和层次分析法（AHP）模型在孟加拉国丘陵地区雨水收集潜在区识别中的性能

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Journal of Asian Earth Sciences: X Pub Date : 2025-06-01 Epub Date: 2025-01-03 DOI: 10.1016/j.jaesx.2024.100189

Md. Mahmudul Hasan , Md. Talha , Most. Mitu Akter , Md Tasim Ferdous , Pratik Mojumder , Sujit Kumar Roy , N.M. Refat Nasher

{"title":"Assessing the performance of machine learning and analytical hierarchy process (AHP) models for rainwater harvesting potential zone identification in hilly region, Bangladesh","authors":"Md. Mahmudul Hasan , Md. Talha , Most. Mitu Akter , Md Tasim Ferdous , Pratik Mojumder , Sujit Kumar Roy , N.M. Refat Nasher","doi":"10.1016/j.jaesx.2024.100189","DOIUrl":"10.1016/j.jaesx.2024.100189","url":null,"abstract":"<div><div>Water scarcity in hilly regions presents unique challenges, particularly in Bangladesh, where obtaining fresh drinking water has become difficult to access. This study aims to evaluate the potential zones for rainwater harvesting (RWH) using machine learning (ML) algorithms and geospatial analysis. Specifically, four ML algorithms—random forest (RF), boosted regression trees (BRT), k-nearest neighbors (KNN), and naïve bayes (NB)—alongside the analytical hierarchy process (AHP) were employed to delineate potential RWH zones in the Chattogram hilly districts, including Chattogram, Rangamati, Bandarban, Khagrachari, and Cox’s Bazar. Eleven influencing factors were considered: aspect, distance from road, drainage density, elevation, hill shade, lineament density, land use/land cover (LULC), slope, topographic wetness index (TWI), rainfall, and geology. Inventory data from the study area, consisting of 135 suitable and 135 non-suitable points, were randomly split, with 70% used for training the models and the remaining 30% for validation using the area under the curve (AUC) values. The southern regions are highly suitable for harvesting rainwater. Among the five models, BRT and RF demonstrated superior performance with AUC values of 0.93 for both models. In contrast, the AHP method yielded the lowest AUC value at 0.82. Notably, drainage density and elevation emerged as the most influential factors in constructing these models. The application of machine learning algorithms has enhanced the precision of rainwater harvesting zone estimate systems by examining diverse aspects. The findings of this study can provide valuable insights for policymakers in making informed decisions regarding RWH in these regions.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100189"},"PeriodicalIF":1.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural and bio-stratigraphic records of Janakor valley in north-western Himalayas, Pakistan: Implications for closure of Neo-Tethys Ocean 巴基斯坦喜马拉雅山脉西北部Janakor山谷的构造和生物地层记录：对新特提斯洋闭合的启示

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Journal of Asian Earth Sciences: X Pub Date : 2025-06-01 Epub Date: 2024-12-24 DOI: 10.1016/j.jaesx.2024.100187

Ferdous Jamal , Liang Qiu , Shah Faisal , Suleman Khan , Rafi Ullah , Ahsan Naseer , Qihui Zhang , Dan-Ping Yan , Zhicheng Zhou

{"title":"Structural and bio-stratigraphic records of Janakor valley in north-western Himalayas, Pakistan: Implications for closure of Neo-Tethys Ocean","authors":"Ferdous Jamal , Liang Qiu , Shah Faisal , Suleman Khan , Rafi Ullah , Ahsan Naseer , Qihui Zhang , Dan-Ping Yan , Zhicheng Zhou","doi":"10.1016/j.jaesx.2024.100187","DOIUrl":"10.1016/j.jaesx.2024.100187","url":null,"abstract":"<div><div>The closure of the Tethys Sea, driven by the collision between the Indian and Eurasian plates, represent a significant event in Earth’s tectonic history. However, many aspects of its structural and stratigraphic implications remain poorly understood. This study investigates on the structural style and biostratigraphic framework of the northwestern Himalayas, focusing on the region at the junction of the Attock-Cherat and Kalachitta Ranges, where deformation is dominated by two major faults, e.g., the Hissartang Fault in the Attock-Cherat Ranges to the north and the Janakor Fault along the Main Boundary Thrust (MBT) to the south. Our analysis reveals a tectonostratigraphic sequence ranging from the Cambrian to the Miocene. Notably, units from the Mid-Cretaceous, Early Paleocene, and Eocene periods are conspicuously absent. Structurally, the region exhibits east–west trending tight, isoclinal folds, where Early and Late Cretaceous units occupy the fold crests and troughs, respectively. Jurassic and Paleocene strata are also involved in deformation, with a network of forethrusts, backthrusts, and overturned thrust contributing to the development of pop-up structure and triangular zones. This study further delineates the boundary marking the Neo-Tethys Ocean closure defined between Eocene marine and Miocene fluvial units. These findings enhance our understanding of the tectonic evolution during this critical period and provide new insights into the kinematic linkage of surface structures with a subsurface décollement within Jurassic strata. This article addresses the scientific challenges of the Neo-Tethys Ocean closure and present a clear and precise account of the structural and biostratigraphic implications of this tectonic event.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100187"},"PeriodicalIF":1.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Are hydropower dams and sand mining responsible for hydrological change in the Red river (Asia)? 水电站大坝和采砂是红河（亚洲）水文变化的原因吗？

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-06-01 Epub Date: 2025-03-22 DOI: 10.1016/j.jaesx.2025.100192

Anh Duc Trinh , Nho Lan Nguyen , Thu Nga Do , Andrew Watson , Michael Stockinger , Christine Stumpp

{"title":"Are hydropower dams and sand mining responsible for hydrological change in the Red river (Asia)?","authors":"Anh Duc Trinh , Nho Lan Nguyen , Thu Nga Do , Andrew Watson , Michael Stockinger , Christine Stumpp","doi":"10.1016/j.jaesx.2025.100192","DOIUrl":"10.1016/j.jaesx.2025.100192","url":null,"abstract":"<div><div>The Red River (RR) in Southeast Asia provides water for food and energy production, building materials in the form of sand mining and facilitates the movement of people and goods for millions of inhabitants in the Yunnan province in China and provinces in northern Vietnam. Since the late 20th century, rapid economic development in the region has led to significant human-induced changes to the RR. In this study, we applied multiple statistical tests (Mann-Kendall, Pettitt, Mann-Whitney and principal component analysis) to analyse daily water flow data from seven hydro-meteorological stations in the lower section of the RR, aiming to identify the primary factors altering the water flow regime. Our findings indicate that the Hoa Binh reservoir, commissioned in 1989, and the Son La reservoir, commissioned in 2010, have significantly modified the flow regime, reducing the annual mean water flow of the RR main tributary from 1763 m<sup>3</sup> s<sup>−1</sup> between 1986 and 2008 to 1334 m<sup>3</sup> s<sup>−1</sup> between 2009 and 2023. This study is the first to identify that widespread and loosely regulated sand mining in the lower RR region has not only lowered the riverbed and water levels, as reported in recent studies, but also increased groundwater discharge into the river. As a result, despite the reduced upstream water flow from the mountains, the river discharge in the downstream region has remained statistically unchanged over the past decade in the RR.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100192"},"PeriodicalIF":1.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Differential diagenetic and densification processes of low-permeability and tight sandstones: A case study of the Jurassic Shaximiao Formation in the central and western Sichuan Basin, China 低渗透致密砂岩差异成岩致密化过程——以四川盆地中西部侏罗系沙溪庙组为例

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Journal of Asian Earth Sciences: X Pub Date : 2025-06-01 Epub Date: 2025-01-09 DOI: 10.1016/j.jaesx.2025.100190

Laixing Cai , Chengfang Yuan , Shaomin Zhang , Xiaojuan Wang , Yinglin Liu , Weixue Guo , Tian Yang

{"title":"Differential diagenetic and densification processes of low-permeability and tight sandstones: A case study of the Jurassic Shaximiao Formation in the central and western Sichuan Basin, China","authors":"Laixing Cai , Chengfang Yuan , Shaomin Zhang , Xiaojuan Wang , Yinglin Liu , Weixue Guo , Tian Yang","doi":"10.1016/j.jaesx.2025.100190","DOIUrl":"10.1016/j.jaesx.2025.100190","url":null,"abstract":"<div><div>Tight sandstone reservoirs of low permeability are of both scientific and economic significance, but their origin and formation process remain not well understood.. In this paper, we present a comprehensive study of the tight sandstone reservoir of the Middle Jurassic Shaximiao Formation distributed in central and western Sichuan Basin, by integrating scanning electron microscopy, X-ray diffraction, high-pressure mercury injection, and nuclear magnetic resonance. The aim of this study was to investigate the differential diagenetic sequences constrained by quantifying the provenance of the sandstones and densification processes. Overall, the Shaximiao Formation sandstones have low porosity of 0.46 %–18.76 % (averaging 10.17 %) and low permeability ranging from 0.0003 to 632.42 × 10<sup>−3</sup> μm<sup>2</sup> (averaging 3.67 × 10<sup>−3</sup> μm<sup>2</sup>), with 73.72 % being classified as tight reservoirs. The sandstone samples from the western Sichuan Basin commonly display tubular or needle-shaped throats with less developed microfractures, consequently having weaker seepage capacity compared to the varieties in the central Sichuan Basin that are characterized by abundant lamellar and necked throats. The results suggest that the slightly lower contents of rigid particles and higher contents of fragments and argillaceous matrix facilitated continuous compaction and multitype cementation processes. Meanwhile, strong compaction of the rocks with cements of carbonate, siliceous materials, and laumontite being the cement lead to porosity reduction of 29.8 %, 12.27 %, 13.34 %, and 12.33 %, respectively. In contrast, chlorite coating and dissolution events have crucial roles in preserving pores and enhancing permeability.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100190"},"PeriodicalIF":1.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geochemical features of the Lower Silurian strata in Xiushan, Chongqing: Implications for paleoclimate reconstruction 重庆秀山下志留统地层地球化学特征及其古气候重建意义

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-06-01 Epub Date: 2024-12-10 DOI: 10.1016/j.jaesx.2024.100186

La Zhang , Yang Chen , Jinhua Luan , Ruigang Zhang , Zhiwei Cui , Haitong Zhao , Qian Wang

{"title":"Geochemical features of the Lower Silurian strata in Xiushan, Chongqing: Implications for paleoclimate reconstruction","authors":"La Zhang , Yang Chen , Jinhua Luan , Ruigang Zhang , Zhiwei Cui , Haitong Zhao , Qian Wang","doi":"10.1016/j.jaesx.2024.100186","DOIUrl":"10.1016/j.jaesx.2024.100186","url":null,"abstract":"<div><div>The Silurian was featured by frequent climatic and environmental changes. Impoverished marine faunas slowly recovered from the end-Ordovician mass extinction. Diverse fossils have been reported from the Lower Silurian strata in Xiushan, Chongqing, southwest China, revealing a previously unrecognized diversification of jawed vertebrates in the Early Silurian. However, the paleoclimatic evolution during this period and the geochemical features of these strata are ambiguous. To reconstruct the Early Silurian paleoclimatic evolution, we have collected samples from the Lower Silurian (Xiaoheba, Rongxi, Xiushan, and Huixingshao formations) and Upper Silurian (Xiaoheba formation) strata in the Xiushan area. These Lower Silurian strata have a similar felsic source with insignificant sorting and recycling during deposition as documented by TiO<sub>2</sub>/Zr, La/Yb, Th/Sc, Zr/Sc, Cr/Th ratios, and ICV. The parent rocks of the Xiaoxi formation are complex and have been affected by recycled sediments. Weathering indices (CIA<sub>corr</sub>, PIA<sub>corr</sub>, WIP<sub>corr</sub>, and CIW) of the Lower Silurian vary within the range of moderate weathering, indicating that although there are small-scale climatic changes, the climate remained relatively stable from the Aeronian to the middle-late Telychian, generally characterized by a warm environment, except for a cooler interval during the early Telychian. Combined with the report of the Chongqing Lagerstätte and various fossils in this area, we speculate that a relatively stable climate and abundant terrestrial nutrient influx may have facilitated the evolution of the early gnathostomes in the Early Silurian.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100186"},"PeriodicalIF":1.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial distribution of structural lineaments in the Al-Lith geothermal field, western Saudi Arabia: Remote sensing and aeromagnetic data analysis 沙特阿拉伯西部Al-Lith地热田构造线的空间分布：遥感和航磁数据分析

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Journal of Asian Earth Sciences: X Pub Date : 2025-06-01 Epub Date: 2025-03-08 DOI: 10.1016/j.jaesx.2025.100191

Jawad Rafiq, Israa S. Abu-Mahfouz, Konstantinos Chavanidis, Daffa Arrofi, Pantelis Soupios

{"title":"Spatial distribution of structural lineaments in the Al-Lith geothermal field, western Saudi Arabia: Remote sensing and aeromagnetic data analysis","authors":"Jawad Rafiq, Israa S. Abu-Mahfouz, Konstantinos Chavanidis, Daffa Arrofi, Pantelis Soupios","doi":"10.1016/j.jaesx.2025.100191","DOIUrl":"10.1016/j.jaesx.2025.100191","url":null,"abstract":"<div><div>Saudi Arabia is enriched in numerous geothermal resources. Among these, Wadi Al-Lith is regarded as one of the favorable geothermal prospects in western Saudi Arabia, featuring several hot springs with a discharge temperature of around 95 °C. However, there is still uncertainty regarding the delineation of the prospective geothermal reservoir, and the assessment of the geothermal energy reserves. Therefore, this paper aims to delineate the prospective geothermal area, utilizing remote sensing and geophysical (magnetic) data. This research maps the surface and subsurface geological and structural features (faults, fractures, and fold axes) and analyzes their densities using an integrated geological-remote sensing-geophysical investigation. Digital elevation models and Landsat-8 imagery, supported by field investigations, were used to analyze surface lineament density, while airborne magnetic data was used to analyze subsurface lineament density. The study area was subdivided into ten zones based on surface lineament density, with the northernmost zone presenting the highest lineament density. Subsurface lineament density analysis revealed five high-density zones, three of which correspond well with those identified on the surface. The study also identified the main high-permeability zones and associated geothermal anomalies in the Wadi Al-Lith area, improving the understanding of its potential geothermal resources. The results of this study could serve as a preliminary guide for further geothermal exploration, highlighting surface manifestations that require in-depth investigation using geoscientific and drilling tools.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100191"},"PeriodicalIF":1.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The status of artisanal coal mining in Afghanistan: Using remote sensing to assess remaining artisanally mineable Jurassic coal resources 阿富汗手工开采煤炭的现状：利用遥感技术评估剩余的可手工开采的侏罗纪煤炭资源

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2024-12-01 Epub Date: 2024-09-02 DOI: 10.1016/j.jaesx.2024.100185

Christopher Wnuk

{"title":"The status of artisanal coal mining in Afghanistan: Using remote sensing to assess remaining artisanally mineable Jurassic coal resources","authors":"Christopher Wnuk","doi":"10.1016/j.jaesx.2024.100185","DOIUrl":"10.1016/j.jaesx.2024.100185","url":null,"abstract":"<div><p>Coal mining is critical to the functioning of the current Afghan economy providing jobs, tax revenue, and foreign exchange. Taxes on coal may constitute the Taliban Government’s single largest source of operating income. Prior to the start of mining, Afghanistan had between 215 M and 430 M tonnes of hypothetical category Jurassic coal resources at depths accessible to artisanal miners. Since 1940, between 51 M and 89 M tonnes of coal have been extracted. Technologically primitive mining practices result in suboptimal coal extraction from disorganized room and pillar mines leaving significant amounts of coal unmineable. Frequent tunnel collapse, gas and coal dust explosions, and uncontrolled widespread mine fires have destroyed or made inaccessible significant additional volumes of remaining artisanally mineable resources. The haphazard unmapped development of the existing Jurassic coal makes it impossible to redevelop these fields using more efficient mining technologies. If new mines are to be developed, they will have to tap subsurface coals not accessible to artisanal miners. 66 % of the area mapped as Lower to Middle Jurassic rock does not host outcropping coal beds. This area, as well as some of the areas beneath thin veneers of lowest Cretaceous sediment are potential exploration targets. Jurassic coals are very gassy. Developing coalbed methane prospects is a more effective and less environmentally destructive means to access the energy contained in the Jurassic coals.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"12 ","pages":"Article 100185"},"PeriodicalIF":1.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056024000136/pdfft?md5=e752d3057a3052520e4eec8391f2c74b&pid=1-s2.0-S2590056024000136-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142129113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of the source rock potential in the Sirka and Giddi collieries of South Karanapura coalfield, Jharkhand, India: Insights from megaflora, palynology, and geochemistry 印度贾坎德邦南卡拉纳普拉煤田 Sirka 和 Giddi 煤矿的源岩潜力评估：巨型植物、古植物学和地球化学的启示

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Journal of Asian Earth Sciences: X Pub Date : 2024-12-01 Epub Date: 2024-07-14 DOI: 10.1016/j.jaesx.2024.100181

Sanghamitra Pradhan , Divya Mishra , Neha Aggarwal , Shreerup Goswami

{"title":"Assessment of the source rock potential in the Sirka and Giddi collieries of South Karanapura coalfield, Jharkhand, India: Insights from megaflora, palynology, and geochemistry","authors":"Sanghamitra Pradhan , Divya Mishra , Neha Aggarwal , Shreerup Goswami","doi":"10.1016/j.jaesx.2024.100181","DOIUrl":"10.1016/j.jaesx.2024.100181","url":null,"abstract":"<div><p>Permian deposits in the Indian Peninsula have long been a significant source of coal and have great potential for hydrocarbon exploration. Here we present results of megafloral, palynological, and geochemical analysis of the Late Artinskian-Kungurian sediments in the South Karanpura coalfield to assess hydrocarbon generation potential, kerogen types, depositional settings, and thermal maturation. The results suggest anoxic to oxic depositional environments with fluctuating water levels, influenced by terrestrial inputs. The Sirka colliery is considered to be most favorable for hydrocarbon generation due to the palaeodepositional setting dominated by flooded palaeomires. The dominance of degraded organic matter and the rarity of opaque phytoclasts suggest type II/III to type III kerogen material in the palaeomire of the Srika succession, characterized by low-energy dysoxic to anoxic conditions. The thermal maturation values (Tmax 429℃) and the production index (0.01–0.02) indicate that the Sirka area has immature kerogen, but the Giddi colliery has a relatively higher Tmax (average 435℃) placing the studied sample within the mature zone. However, due to deposition in the oxidized swamp, Giddi C has poor potential for hydrocarbon generation, showing that type III/IV material has charcoal input into the sediments. Our findings contribute to global knowledge of coal formations’ oil and gas storage capacity, which has implications for energy resource assessment and exploration strategies.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"12 ","pages":"Article 100181"},"PeriodicalIF":1.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056024000094/pdfft?md5=fb64c65a3fe702698fa65131fbc89141&pid=1-s2.0-S2590056024000094-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141623720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-resolution 3D ambient noise tomography around the Meishan-Chiayi active fault system of western Taiwan 台湾西部梅山嘉义活动断层系统周围的高分辨率三维环境噪声断层成像

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Journal of Asian Earth Sciences: X Pub Date : 2024-12-01 Epub Date: 2024-07-17 DOI: 10.1016/j.jaesx.2024.100182

Ching-Yu Cheng , Hao Kuo-Chen , Dennis Brown , Huajian Yao , Kai-Xun Chen , Kuo-Fong Ma

{"title":"High-resolution 3D ambient noise tomography around the Meishan-Chiayi active fault system of western Taiwan","authors":"Ching-Yu Cheng , Hao Kuo-Chen , Dennis Brown , Huajian Yao , Kai-Xun Chen , Kuo-Fong Ma","doi":"10.1016/j.jaesx.2024.100182","DOIUrl":"10.1016/j.jaesx.2024.100182","url":null,"abstract":"<div><p>The Meishan-Chiayi area of western Taiwan has a large probability of producing a major earthquake in the near future. Historically, one of the largest and most damaging of Taiwan’s earthquakes occurred there. It is, therefore, important to have a well-constrained upper crustal 3-D shear-wave velocity model that can be used to accurately determine ground motion predictions and fault geometry models used in seismic hazard and risk modelling. In this study, we carried out an ambient noise tomography experiment using 100 seismometers deployed with a ∼2 km spacing on a 20 by 20 km grid. The reliable periods of phase velocity from Rayleigh waves are 0.6 to 6.8 s, providing a well-resolved Vs structure from the surface to a depth of around 4 km. The velocity model displays a prominent, roughly northeast-striking change in Vs that follows the projected surface trace of the blind Chiayi thrust. The uplift of relatively higher Vs rocks in its hanging wall, together with a negative to positive change in dVs suggests that it dips gently eastward across the study area. A northward thickening of the lower Vs crust, together with a high negative dVs in the north of the study area is related to an increased thickness of foreland basin rocks across the Meishan fault. The Vs and dVs models provide reasonable evidence that the Meishan fault can be traced at a high angle from its surface rupture to the base of the model at 4 km depth. It cuts the Chiayi thrust.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"12 ","pages":"Article 100182"},"PeriodicalIF":1.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056024000100/pdfft?md5=ade33dc5741d22d509cfbee22177c15e&pid=1-s2.0-S2590056024000100-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141851373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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