Journal of Asian Earth Sciences: X最新文献_第2页

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

IF 1.7

Journal of Asian Earth Sciences: X Pub 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":"2025-01-03","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

IF 1.7

Journal of Asian Earth Sciences: X Pub 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":"2024-12-24","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

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 : 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":"2024-12-10","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

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 : 2024-09-02 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":"2024-09-02","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

Shuttle radar topography-based analysis reveals the active Borneo Island Fault in Borneo, SE Asia 基于穿梭雷达的地形分析揭示了东南亚婆罗洲活跃的婆罗洲岛断层

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2024-08-24 DOI: 10.1016/j.jaesx.2024.100184

Hazwan Syafiq , A.A. Shah , Muhammad Gazali Rachman

{"title":"Shuttle radar topography-based analysis reveals the active Borneo Island Fault in Borneo, SE Asia","authors":"Hazwan Syafiq , A.A. Shah , Muhammad Gazali Rachman","doi":"10.1016/j.jaesx.2024.100184","DOIUrl":"10.1016/j.jaesx.2024.100184","url":null,"abstract":"<div><p>This study presents the results of shuttle radar topography-based analysis providing new insights into the geological and structural architecture of the island of Borneo. The aim is to examine whether Borneo is tectonically active and to better understand the origin of prominent topographic features such as the Dulit Plateau and the large oroclinal bend of Sarawak. The results show that the Tinjar and the Lupar lines are tectonically active fault zones. The Lupar fault zone is broadly distributed along the spine of the island, representing a major suture featured by ophiolites and extensive volcanism. The development of the Dulit Triangle and the large oroclinal bend are related to fault interactions. The seismological, geodetic and geomorphological evidence suggests that Borneo is tectonically active. The Borneo Island Fault is the major active fault piercing through the island’s mountainous backbone. On a tectonic scale, the oblique northeastward active convergence of the Australian plate with the Sunda plate drives the deformation on the island of Borneo, some of which is also associated with the northward motion of the Philippine Sea plate. Recent GPS data indicate that the Sunda plate is moving slowly to the southwest, and our results suggest this motion is consistent with the interaction between the Sunda and the Australian plates.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"12 ","pages":"Article 100184"},"PeriodicalIF":1.7,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056024000124/pdfft?md5=eee27b96b452e7def2e11cd31ffaf808&pid=1-s2.0-S2590056024000124-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142129114","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

Anthropogenic impacts on the water chemistry of a transboundary river system in Southeast Asia 人类活动对东南亚跨界河流水化学的影响

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2024-08-14 DOI: 10.1016/j.jaesx.2024.100183

Duc A. Trinh , Nga T. Do , Virginia N. Panizzo , Suzanne McGowan , Jorge Salgado , Andy R.G. Large , Andrew C.G. Henderson , Thuy T. Vu

{"title":"Anthropogenic impacts on the water chemistry of a transboundary river system in Southeast Asia","authors":"Duc A. Trinh , Nga T. Do , Virginia N. Panizzo , Suzanne McGowan , Jorge Salgado , Andy R.G. Large , Andrew C.G. Henderson , Thuy T. Vu","doi":"10.1016/j.jaesx.2024.100183","DOIUrl":"10.1016/j.jaesx.2024.100183","url":null,"abstract":"<div><p>The Red River originating from Yunnan province, China is the second largest river in Vietnam in terms of length and discharge. Combination of water chemistry monitoring data of 4 years (2018–2022) from different sub-basins of the Red River (the Da, Lo, Thao, Tra Ly, and Day) with historical datasets indicates a decline in pH from 8.1 in 2000 to 7.7 in 2021, greater CO<sub>2</sub> concentrations and a shift from waters naturally dominated by carbonate weathering to waters dominated by evaporite weathering. Such changes were most apparent in the delta area where heavy human activities have increased influxes of most dissolved chemicals, except SiO<sub>2</sub>. Evaporite weathering is particularly enhanced by mining and deforestation occurring in upstream regions of both China and Vietnam. Pyrite oxidation, alongside silicate weathering, is enhanced along the Red River Fault Zone but reduced in tributaries with a higher proportion of hydropower reservoirs. Longer water residence times in these large reservoirs (total volume > 2.7x10<sup>10</sup> m<sup>3</sup>) located in the Da and Lo sub-basins have also increased primary productivity, leading to higher evasion/uptake of CO<sub>2</sub> and SiO<sub>2</sub>, lower total dissolved solids (TDS), and higher pH. The total physical and chemical denudation rates of upstream mountain tributaries ranged between 0.107 ± 0.108 and 0.139 ± 0.137 mm yr<sup>−1</sup>, mainly due to reservoir implementation and instream aquatic biogeochemistry changes. Our findings demonstrate that anthropogenic activities are profound factors impacting the water chemistry of the Red River system.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"12 ","pages":"Article 100183"},"PeriodicalIF":1.7,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056024000112/pdfft?md5=89ed199b16d1c7b2a79f98be11fbb1d7&pid=1-s2.0-S2590056024000112-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141998356","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

IF 1.7

Journal of Asian Earth Sciences: X Pub 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":"2024-07-17","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}

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

IF 1.7

Journal of Asian Earth Sciences: X Pub 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":"2024-07-14","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

Quaternary deposition and erosion in the northeastern sunda strait: An interplay between sea level, tectonics, and magmatic activity 孙达海峡东北部的第四纪沉积和侵蚀：海平面、构造和岩浆活动之间的相互作用

Journal of Asian Earth Sciences: X Pub Date : 2024-06-02 DOI: 10.1016/j.jaesx.2024.100179

Susilohadi Susilohadi , Franto Novico , Laurent Husson , Riza Rahardiawan , Harkins Prabowo , Joni Widodo , Evie Hadrijantie Sudjono

{"title":"Quaternary deposition and erosion in the northeastern sunda strait: An interplay between sea level, tectonics, and magmatic activity","authors":"Susilohadi Susilohadi , Franto Novico , Laurent Husson , Riza Rahardiawan , Harkins Prabowo , Joni Widodo , Evie Hadrijantie Sudjono","doi":"10.1016/j.jaesx.2024.100179","DOIUrl":"10.1016/j.jaesx.2024.100179","url":null,"abstract":"<div><p>The northeastern Sunda Strait is a narrow strait separating Java and Sumatra islands. Currently, it forms a seaway between the Java Sea and the Indian Ocean. The geological setting of the region is extremely dynamic, but how the Plio-Pleistocene interplay between sea level oscillations, magmatism, and tectonics, which lead to the current setting, has not been completely understood. We analysed an important set of legacy shallow seismic data from this area to decipher these intricate relationships. Our results indicate that the tectonic extension partly dismantled the Indonesian arc since the Middle Miocene. However, volcanic products formed a barrier between the Sunda Shelf and the Indian Ocean during the Late Pliocene to the Middle Pleistocene. Marine flooding started during the Middle Pleistocene but bypassed the barrier by flooding the NW edge of Java Island. During the Late Pleistocene, high amplitudes and longer periods of the glacial-interglacial cycles ultimately connected the Java Sea with the Indian Ocean. Still, it was only during the Holocene that important erosion made this seaway efficient in transporting seawater between the two reservoirs.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"12 ","pages":"Article 100179"},"PeriodicalIF":0.0,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056024000070/pdfft?md5=257ed79d4e73ea2544892ab385b47d9e&pid=1-s2.0-S2590056024000070-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141279927","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

Mineral chemistry and alteration patterns of Cr-spinel in serpentinized peridotites from NW Iran 伊朗西北部蛇纹岩化橄榄岩中Cr-spinel的矿物化学和蚀变模式

Journal of Asian Earth Sciences: X Pub Date : 2024-04-01 DOI: 10.1016/j.jaesx.2024.100178

Mohssen Moazzen , Masoumeh Ahangari , Roland Oberhänsli , Uwe Altenberger

{"title":"Mineral chemistry and alteration patterns of Cr-spinel in serpentinized peridotites from NW Iran","authors":"Mohssen Moazzen , Masoumeh Ahangari , Roland Oberhänsli , Uwe Altenberger","doi":"10.1016/j.jaesx.2024.100178","DOIUrl":"https://doi.org/10.1016/j.jaesx.2024.100178","url":null,"abstract":"<div><p>The Late Cretaceous ophiolite mélange in the Salmas area of NW Iran is a part of the Neotethys ophiolites. The mélange includes serpentinized harzburgite, serpentinites, mafic rocks, radiolarite, layered red pelagic limestones and grey and white marbles. Harzburgite main primary mineral phases are olivine, orthopyroxene, clinopyroxene and Cr-spinel. Cr-spinel has Cr<sub>2</sub>O<sub>3</sub> contents of 21.13 to 30.18 wt% and high Al<sub>2</sub>O<sub>3</sub> (38.67–48.52 wt%), FeO (15.18–18.13 wt%) and MgO (15.18–17.51 wt%) contents. The 100 × Cr/(Cr + Al) ratios of 23 to 34 indicate 9 to 13 % partial melting in the Mid Ocean Ridge (MOR) environment for the origin of the peridotites. An alteration zone is developed around the altered Cr-spinel. Fine-grained minerals assemblage at the spinel crystals’ margin includes Cr-rich chlorite, Cr-rich garnet and spinel-silicate mixture. A 2–5 μm wide transitional zone is developed between the chromite-silicate assemblage and the Cr-rich garnet zone. The chemical variations of major oxides across the alteration zone are mainly diffusion controlled. Al, Cr and Mg have diffused out from the primary spinel and Fe and Mn have diffused into the spinel. Cr-spinel is altered in two stages due to serpentinization. During the first stage and following hydration, spinel reacted with olivine and orthopyroxene to form Cr-rich chlorite and ferrian chromite. Silica formed at this stage. At the second stage, the reaction between the chromite-silicate assemblage and Cr-rich chlorite plus silica form the first stage and Ca<sup>2+</sup> in the fluid (released from clinopyroxene alteration) produced Cr-rich garnet and H<sub>2</sub>O-rich fluid, at temperature between 400 and 600 °C.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"11 ","pages":"Article 100178"},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056024000069/pdfft?md5=e44776860847660f40be2143972ae8ce&pid=1-s2.0-S2590056024000069-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140338578","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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