Journal of Asian Earth Sciences: X最新文献_第10页

Van Canh Triassic granite in the Kontum Massif, central Vietnam: Geochemistry, geochronology, and tectonic implications 越南中部孔图姆地块Van Canh三叠纪花岗岩:地球化学、地质年代学和构造意义

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2021.100075

Doan Dinh Hung , Yukiyasu Tsutsumi , Pham Trung Hieu , Nguyen Trung Minh , Pham Minh , Nguyen Thi Dung , Nguyen Ba Hung , Toshifumi Komatsu , Nguyen Hoang , Kenta Kawaguchi

{"title":"Van Canh Triassic granite in the Kontum Massif, central Vietnam: Geochemistry, geochronology, and tectonic implications","authors":"Doan Dinh Hung , Yukiyasu Tsutsumi , Pham Trung Hieu , Nguyen Trung Minh , Pham Minh , Nguyen Thi Dung , Nguyen Ba Hung , Toshifumi Komatsu , Nguyen Hoang , Kenta Kawaguchi","doi":"10.1016/j.jaesx.2021.100075","DOIUrl":"10.1016/j.jaesx.2021.100075","url":null,"abstract":"<div><p>The Kontum Massif, located in central Vietnam, played an essential role in the evolution of Indochina and its adjacent areas. The Van Canh granites, exposed throughout the Southern Kontum Massif, display SiO<sub>2</sub> contents ranging from 65.82 to 75.35 wt%, and total alkaline (Na<sub>2</sub>O + K<sub>2</sub>O) from 5.47 to 9.82 wt%, with A/CNK values between 0.97 and 1.08. The main rock-forming minerals of the Van Canh granites are quartz (25–30 vol%), K-feldspar (27–30 vol%), plagioclase (28–30 vol%), and biotite (3–5 vol%). The whole-rock chemical composition is characterized by Ba, Nb, Ce, P, and Ti- depletion, and the enrichment of Th, K, Pb, Nd, and Y. The ɛ<sub>Hf(t)</sub> values of zircon grains range from −11.1 to −6.7, and the Hf model ages (T<sub>DM2</sub>) are from 1.97 to 1.70 Ga. Their geochemical features are similar to the S-type granite, being derived from partial melting of Paleoproterozoic sources. The zircon Hf model ages and inherited zircon ages are evidence of Paleoproterozoic basement in the study region. LA-ICP-MS zircon U-Pb dating yields crystallization ages of 251–229 Ma, showing the existence of Triassic magmatism in the Kontum Massif. The Van Canh granites in the Kontum Massif, central Vietnam, provide significant evidence for the syn-/post-collision of North Vietnam-South China and Indochina blocks.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100075"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056021000323/pdfft?md5=dee29684d8f61a5bd119a1581c9ff934&pid=1-s2.0-S2590056021000323-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47186171","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: 5

Model-based approach to improve class 1 AVO attributes 基于模型的1类AVO属性改进方法

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2021.100076

Ashok Yadav , Soumya Nayak , Samit Mondal , Rima Chatterjee

{"title":"Model-based approach to improve class 1 AVO attributes","authors":"Ashok Yadav , Soumya Nayak , Samit Mondal , Rima Chatterjee","doi":"10.1016/j.jaesx.2021.100076","DOIUrl":"10.1016/j.jaesx.2021.100076","url":null,"abstract":"<div><p>We propose a model-based Amplitude Variation with Offset (AVO) approach to address the assumption of weak elastic contrast in the linearized approximations of Aki-Richard equation. Existing approximations, especially for the Class 1 AVO response, which indicates the positive elastic contrast, deviate significantly from the Zoeppritz equation in presence of large elastic contrast. Results of the proposed approach show that it can minimize the deviation from the Zoeppritz equation, improve AVO attributes, and is capable of providing the desired attribute for characterizing a reservoir. The method starts with two matrices. One matrix is of the simulated rock properties termed as the rock-property-matrix and the other of the Zoeppritz AVO responses for those rock properties termed as the response-matrix. A model-based AVO equation or the basis-function-matrix is computed utilizing the rock-property-matrix and the response-matrix. The inverse of the basis-function-matrix is applied to the real data to get the AVO attributes from this approach. The conventional AVO (Aki-Richards) and model-based AVO attributes are compared in a class 1 AVO environment from the offshore east coast of India. The curvature attribute based on model-based AVO shows significant improvement. The synthetic-seismic correlation of the curvature attribute improves from −0.03 to 0.9 while synthetic-seismic correlation of the gradient attribute improves from 0.5 to 0.77. The improved AVO attribute volumes add significant values in the reservoir characterization.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100076"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056021000335/pdfft?md5=b818089ec639df3b0e814a6441624e8b&pid=1-s2.0-S2590056021000335-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46093339","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

Tectonic implication in the evolution of lake and Quaternary landforms in the Lohawati river basin, Kumaun outer Lesser Himalaya 库曼外小喜马拉雅洛哈瓦蒂河流域湖泊和第四纪地貌演化的构造意义

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2022.100102

Khayingshing Luirei , Limasanen Longkumer , Girish Ch. Kothyari , Suman Rawat , Mohd Zulquer Nain

{"title":"Tectonic implication in the evolution of lake and Quaternary landforms in the Lohawati river basin, Kumaun outer Lesser Himalaya","authors":"Khayingshing Luirei , Limasanen Longkumer , Girish Ch. Kothyari , Suman Rawat , Mohd Zulquer Nain","doi":"10.1016/j.jaesx.2022.100102","DOIUrl":"10.1016/j.jaesx.2022.100102","url":null,"abstract":"<div><p>The evolution of the Quaternary landforms in the Champawat area of the outer Kumaun Lesser Himalaya is reconstructed from the paleolake sections and the geometry of the landscape. Conjugate sets of normal faults are observed in both the bedrocks and Quaternary deposits at Banlek. The most prominent normal faults are those striking NE-SW and NW-SE and most of them are steeply dipping faults while some are vertical faults. Sediments akin to the lacustrine deposits are observed at four sites; while the contact between the bedrock and the lake sediments is observed at only one site in the peripheral side. The exposed sediments thicknesses vary from 8.30 m to 4.8 m and consist of an alternation of black carbonaceous mud and sandy horizons indicating different depositional regimes. The total thickness of the lake sediments appears to be more than 75 m as deduced from elevational differences between the exposed sites. From Site 1, two OSL samples collected from 2.5 m and 8 m from the present ground surface, were analyzed which give OSL ages of 16 ka and 17 ka, respectively; while one sample collected from Site 4 gives an OSL age of 13 ka. A total of 3653 lineaments were mapped encompassing 2,277.8 sq km from the eastern Kumaun Himalaya. Maximum of the lineaments trend ENE-WSW or almost E-W (∼46.5%); the major principal stress is deduced to be in NE-SW direction. Lake, mature topography and gentle stream gradient in the Champawat area are the result of highly weathered bedrocks and development of the normal faults.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100102"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056022000238/pdfft?md5=a355360213fb733f77c65955413c6146&pid=1-s2.0-S2590056022000238-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44557203","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: 1

Occurrence of small to moderate magnitude earthquakes in Kachchh intraplate zone: A special emphasis to the 2020 Bhachau earthquake Kachchh板内带中小震级地震的发生:特别强调2020年巴肖地震

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2022.100089

Pallabee Choudhury , Charu Kamra , Santosh Kumar , Ketan Singha Roy , K. Madhusudhana Rao , Sumer Chopra , M. Ravi Kumar

{"title":"Occurrence of small to moderate magnitude earthquakes in Kachchh intraplate zone: A special emphasis to the 2020 Bhachau earthquake","authors":"Pallabee Choudhury , Charu Kamra , Santosh Kumar , Ketan Singha Roy , K. Madhusudhana Rao , Sumer Chopra , M. Ravi Kumar","doi":"10.1016/j.jaesx.2022.100089","DOIUrl":"10.1016/j.jaesx.2022.100089","url":null,"abstract":"<div><p>Since the 2001 M<sub>w</sub> 7.7 Bhuj earthquake in Gujarat, western India, a number of small-to-moderate earthquakes have occurred to the east of the Bhuj rupture, near the town of Bhachau. In this paper, we present an overview of seismic monitoring in the region, and analysis of a M<sub>w</sub> 5.3 earthquake that occurred near Bhachau on 14 June 2020. Moment tensor analysis of regional broadband data reveals a reverse mechanism with a small strike-slip component, generally similar to that of the 2001 Bhuj earthquake. A total of 20 aftershocks with magnitudes ranging from 2.0 to 4.6 were recorded within the first 10 days of the sequence. After that, this region recorded 129 tremors of magnitude 2.0–4.2 until June 2021. We conclude that this sequence occurred on the South Wagad fault (SWF)-Kachchh Mainland fault (KMF) system, a complex zone comprising many separate mapped faults. A recent analysis of Global Positioning System (GPS) data reveals that the area is under broad compressive stress, with a maximum strain of 5 nano-strain/year. The occurrence of the 2020 Bhachau earthquake underscores concerns for continuing seismic hazard in the region.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100089"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S259005602200010X/pdfft?md5=b0f34d447bf3897c510353af177b63ab&pid=1-s2.0-S259005602200010X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41287737","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

Organic petrography and depositional environments of the upper Eocene Kopili Shale, Bengal Basin, Bangladesh 孟加拉盆地始新统上Kopili页岩有机岩相学与沉积环境

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2022.100092

Shakura Jahan , Ashraf Uddin

{"title":"Organic petrography and depositional environments of the upper Eocene Kopili Shale, Bengal Basin, Bangladesh","authors":"Shakura Jahan , Ashraf Uddin","doi":"10.1016/j.jaesx.2022.100092","DOIUrl":"https://doi.org/10.1016/j.jaesx.2022.100092","url":null,"abstract":"<div><p>Mudrock samples of the upper Eocene Kopili Shale, taken from the outcrops in the northeastern Sylhet Trough areas, and drilled cores from the Indian Platform in the northwestern Bangladesh, were investigated in order to present an overview of the depositional environment. Several techniques such as organic petrography, thin section petrography, X-Ray fluorescence (XRF) elemental analysis, X-Ray diffraction (XRD) mineralogical analysis, and lithologic observations were combined to draw the best possible conclusions.</p><p>Organic petrographic analysis shows higher proportion of vitrinite along with liptinitic materials in the northeastern samples, suggesting deposition in an upper deltaic environment, whereas the northwestern samples show abundance of inertinite, indicating deposition in a lower deltaic environment. Thin section petrographic analyses, which reveal planktonic foraminifers, bioturbated fabrics, pyrite framboids, sand lenses and flame structures; and XRD and XRF analyses reveal abundance of quartz and illite in Kopili Shale, all of which suggest deposition in shallow marine reducing environments.</p><p>The fauna in the Kopili Shale can be correlated to upper Eocene faunas of the Tethys Sea around the Indian subcontinent. Organic petrographic analysis suggest provenance from a low-relief crystalline Indian craton located adjacent to the west, rather than the Himalayan or Indo-Burman ranges to the north and east of the Bengal basin. Taken together, the present results suggest that the Kopili Shale of the Bengal basin is a silty mudrock, which was deposited during rapid marine transgression and regression, in a deltaic near-shore setting.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100092"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056022000135/pdfft?md5=40e9099467c66bf3f0450082915e7500&pid=1-s2.0-S2590056022000135-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71856669","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

A review on spatial, temporal and magnitude prediction of landslide hazard 滑坡灾害时空及震级预测研究进展

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2022.100099

Ankit Tyagi, Reet Kamal Tiwari, Naveen James

{"title":"A review on spatial, temporal and magnitude prediction of landslide hazard","authors":"Ankit Tyagi, Reet Kamal Tiwari, Naveen James","doi":"10.1016/j.jaesx.2022.100099","DOIUrl":"https://doi.org/10.1016/j.jaesx.2022.100099","url":null,"abstract":"<div><p>Over the last few decades, several landslide susceptibility and hazard mapping (LSHM) techniques have been developed. Maps for the same region have also been generated by different individuals following dissimilar approaches, which can be grouped into qualitative, semi-quantitative and quantitative approaches. As all these techniques have their pros and cons, hence no one technique is standardized for effective analysis of landslide hazards. One issue is the inconsistency in adopting common terminologies for LSHM, that has unavoidably led to many misperceptions.</p><p>Many authors use susceptibility as a synonym of hazard in landslide zonation. However, Landslide Susceptibility Mapping (LSM) or spatial prediction is just one of the three components of Landslide Hazard Mapping (LHM). The other two components are temporal and magnitude prediction. Many authors have shown their concern regarding the use of hazard and susceptibility terms as synonyms, but none has reviewed those articles and classified them. We reviewed 367 articles from 1972 to 2021, out of which 236 articles were reviewed in detail to prepare a literature database. From the analysis and graphical visualizations of the database, we found the most commonly used techniques for LSHM. We identified a clear geographical biasness in susceptibility analysis. Also, we have found that about 15% of the articles have mistakenly considered susceptibility and hazard terms as synonyms of each other. It constitutes a guideline for future studies and applications, particularly for LSHM. The paper also aims at addressing the gaps in the conversion of susceptibility maps into true hazard and risk maps.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100099"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056022000202/pdfft?md5=7bfb6c234a7ad477386c44c293093bf9&pid=1-s2.0-S2590056022000202-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71856113","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

Origin of inorganic carbon dioxide associated with hydrocarbon generation: Evidence from hydrous pyrolysis experiments and natural and shale gases 与碳氢化合物生成相关的无机二氧化碳的来源：来自含水热解实验和天然气和页岩气的证据

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2021.100079

Wanchun Wang , Liming Ji , Dongjun Song , Dongwei Zhang , Chenfu Lü , Long Su

{"title":"Origin of inorganic carbon dioxide associated with hydrocarbon generation: Evidence from hydrous pyrolysis experiments and natural and shale gases","authors":"Wanchun Wang , Liming Ji , Dongjun Song , Dongwei Zhang , Chenfu Lü , Long Su","doi":"10.1016/j.jaesx.2021.100079","DOIUrl":"10.1016/j.jaesx.2021.100079","url":null,"abstract":"<div><p>Inorganic carbon dioxide with heavier δ<sup>13</sup>C values frequently occurs in natural gases or shale gases generated from marine source rocks. To provide a better understanding on the origin of inorganic CO<sub>2</sub> associated with hydrocarbon generation, hydrous pyrolysis experiments were conducted utilizing source rocks of different depositional environments and varying carbonate mineral concentrations, at a fixed temperature 350 °C, and lithostatic pressure 50 MPa and fluid pressure 28 MPa for 48 h. Carbon dioxide yields, concentrations in gaseous products, and δ<sup>13</sup>C values tend to increase in proportion to the carbonate mineral concentrations of the original source rocks. The results showed that carbonate mineral dissolution might be the principal source of inorganic carbon dioxide generated in the experiments. Based on the δ<sup>13</sup>C values of carbon dioxide produced in the hydrous pyrolysis experiments both in this study and in the literature, we suggest that inorganic CO<sub>2</sub> show δ<sup>13</sup>C values heavier than −8‰, organic CO<sub>2</sub> show δ<sup>13</sup>C values lighter than −16‰, and CO<sub>2</sub> with mixed origins show δ<sup>13</sup>C values ranging from −16 to −8‰. We further discussed the origins of CO<sub>2</sub> in the marine Ordovician natural gases of the Ordos Basin, in the marine Miocene CO<sub>2</sub>-dominated natural gases of the Yinggehai Basin, and in the marine Silurian shale gases of the Sichuan Basin. With a majority of δ<sup>13</sup>C values higher than −8‰, a major inorganic origin from carbonate mineral dissolution were suggested for CO<sub>2</sub> in the natural and shale gases of the above basins.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100079"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056021000360/pdfft?md5=f1be99627e5091af9ce01fab41471f35&pid=1-s2.0-S2590056021000360-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49032259","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: 2

Mineralogy and lithogeochemistry of lower Cretaceous kaolin deposits in the Malha Formation, Southwestern Sinai, Egypt: Implications for the building and construction industry 埃及西奈西南部Malha组下白垩统高岭土矿床的矿物学和岩石地球化学:对建筑和建筑业的启示

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2022.100087

Hossam K. Sharaka , Hatem M. El-Desoky , Mohamed W. Abd El Moghny , Nabil A. Abdel Hafez , Sayed A.A. Saad

{"title":"Mineralogy and lithogeochemistry of lower Cretaceous kaolin deposits in the Malha Formation, Southwestern Sinai, Egypt: Implications for the building and construction industry","authors":"Hossam K. Sharaka , Hatem M. El-Desoky , Mohamed W. Abd El Moghny , Nabil A. Abdel Hafez , Sayed A.A. Saad","doi":"10.1016/j.jaesx.2022.100087","DOIUrl":"10.1016/j.jaesx.2022.100087","url":null,"abstract":"<div><p>This study analyses the exposed outcrops of the Lower Cretaceous (Aptian-Albian) kaolin deposits of the Malha Formation, and characterizes them in terms of lithological, mineralogical, and chemical composition. In addition, the effect of thermal treatment on kaolinite mineral behavior is evaluated. The Malha Formation comprises kaolin deposits, which were sampled at the Rewekna, Ras Watta, Abu El-Nomerat, Essela, and Mosaba Salama sections. The studied samples are composed of kaolinite and quartz as the main constituents, followed by anatase and hematite as accessory (coloring) minerals. X-ray fluorescence (XRF) analysis reveals high Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, and LOI, low CaO, MgO, Cl, SO<sub>3</sub>, and P<sub>2</sub>O<sub>5</sub> contents as well as alkali metals (e.g., K<sub>2</sub>O and Na<sub>2</sub>O). An increase in aluminum and silicon oxides is observed along with the presence of high kaolinite content in these samples. Calcination of the studied kaolinite, by thermal treatment, leads to dehydroxylation and/or transformation to High Reactive Metakaolinite (HRM). The partial replacement of cement by different ratios (3, 5, 10, 15, and 20%) of the produced Metakaolinite (MK) was completed to enhance the physical and mechanical properties. These procedures make the concrete more flexible and workable, increase durability, and are stronger. Besides, reduce the temperature produced from the hydration, as well as decreasing permeability and water absorption of the concrete. This work concludes that the cement substitution and mineral admixtures using Metakaolinite (MK) between 10 and 15% by weight of cement gave rise in compressive strength by 20% if compared by the control mix.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100087"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056022000081/pdfft?md5=fdb6e2d478e15ee5e219d6af6743bb0b&pid=1-s2.0-S2590056022000081-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44240988","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

Geomorphic characterization of a seasonal river network in semi-arid western India using the River Styles Framework 利用河流样式框架对印度西部半干旱地区季节性河网的地貌特征

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2021.100077

Sonam , Vikrant Jain , Kirstie Fryirs , Gary Brierley

{"title":"Geomorphic characterization of a seasonal river network in semi-arid western India using the River Styles Framework","authors":"Sonam , Vikrant Jain , Kirstie Fryirs , Gary Brierley","doi":"10.1016/j.jaesx.2021.100077","DOIUrl":"10.1016/j.jaesx.2021.100077","url":null,"abstract":"<div><p>The imprint of geologic, climatic and anthropogenic memory as controls on geomorphic river diversity is assessed for twelve River Styles in the Sabarmati Catchment. Geologic controls are the primary determinant of river character and behavior in the hinterland and pediment landscape units, where headwater streams transition to partly confined valleys and gorges with distinct structural lineations in a rectangular drainage network. Climate memory imprints entrenched rivers that make up alluvial fan and alluvial plain landscape units of the mid-lower catchment, shaped by phases of sediment aggradation and subsequent incision in response to enhanced monsoonal rains around 10 ka. Terraces constrain channels within confined and partly confined valleys with occasional and discontinuous floodplains respectively. Laterally unconfined channels are only found in the lower parts of the catchment, immediately upstream of the estuary/delta. Limited space for adjustment, impacts of flow regulation and ephemeral conditions restrict the range of contemporary river morphodynamics, but ridges and swales and abandoned channels on floodplains indicate more dynamic conditions in the past. Impacts of anthropogenic memory are most pronounced in the stopbank-controlled, barrage- and dam-impacted reaches, especially in the cities of Gandhinagar and Ahmedabad. An explanation of controls upon geomorphic river diversity, including an assessment of the role of stream power, presents a coherent platform to develop geomorphologically-informed approaches to river management.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100077"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056021000347/pdfft?md5=906222133b98497122c11e1a452c0fe2&pid=1-s2.0-S2590056021000347-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44927238","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: 5

High-resolution peak ground acceleration modeling using geographic information systems: A case study of the potentially active Central Cebu Fault System, Philippines 使用地理信息系统的高分辨率峰值地面加速度建模:菲律宾宿务中央断层系统潜在活动的案例研究

Journal of Asian Earth Sciences: X Pub Date : 2022-06-01 DOI: 10.1016/j.jaesx.2022.100097

Raul Benjamin Mendoza, Noelynna Ramos, Carla Dimalanta

{"title":"High-resolution peak ground acceleration modeling using geographic information systems: A case study of the potentially active Central Cebu Fault System, Philippines","authors":"Raul Benjamin Mendoza, Noelynna Ramos, Carla Dimalanta","doi":"10.1016/j.jaesx.2022.100097","DOIUrl":"10.1016/j.jaesx.2022.100097","url":null,"abstract":"<div><p>The heavily populated Cebu Island is cut by the Central Cebu Fault System (CCFS). While the CCFS has not produced any M<sub>W</sub> > 5.0 earthquakes in the past century, recent strong earthquakes in the adjacent islands have brought attention to the seismic hazards in the region. Fault properties such as strike, dip, slip direction, and surface trace length were determined based on literature review, fieldwork, and analysis of geomorphic features. Empirical relations were utilized to estimate down-dip width and magnitude. The gathered data were used to create a three-dimensional model of the four major faults in the CCFS: Balamban Fault, Central Highland Fault, Uling-Masaba Fault, and Lutac-Jaclupan Fault. The 3D model was used to generate peak ground acceleration maps of central Cebu, should an earthquake occur along any of the major faults. Site corrections were made based on the seismic velocity of the upper 30 m of the subsurface. The major faults are estimated to be capable of generating M<sub>W</sub> 6.4 to 7.1 earthquakes. Worst-case scenarios in densely populated areas show 0.40 to 0.70 g of PGA, suggesting the potential for severe damage in central Cebu. We explored the advantages of using raster mathematics in a GIS platform for calculating and presenting ground motion. These advantages include rapid calculations for tens of millions of points, reducing the effects of interpolation artifacts in final map products. This study emphasizes the importance of detailed structural, geological, and geomorphological data in modeling seismic hazards. Further investigations on the seismogenesis of the CCFS segments are recommended.</p></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"7 ","pages":"Article 100097"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590056022000184/pdfft?md5=73fcecff4afdd1d4caf7c6d6780fd98b&pid=1-s2.0-S2590056022000184-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47712500","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: 1