China Geology最新文献

{"title":"Changes of coastline and tidal flat and its implication for ecological protection under human activities: Take China’s Bohai Bay as an example","authors":"Yong Li ,&nbsp;Ming-zheng Wen ,&nbsp;Heng Yu ,&nbsp;Peng Yang ,&nbsp;Fei-cui Wang ,&nbsp;Fu Wang","doi":"10.31035/cg2023007","DOIUrl":"10.31035/cg2023007","url":null,"abstract":"<div><p>The change processes and trends of shoreline and tidal flat forced by human activities are essential issues for the sustainability of coastal area, which is also of great significance for understanding coastal ecological environment changes and even global changes. Based on field measurements, combined with Linear Regression (LR) model and Inverse Distance Weighing (IDW) method, this paper presents detailed analysis on the change history and trend of the shoreline and tidal flat in Bohai Bay. The shoreline faces a high erosion chance under the action of natural factors, while the tidal flat faces a different erosion and deposition patterns in Bohai Bay due to the impact of human activities. The implication of change rule for ecological protection and recovery is also discussed. Measures should be taken to protect the coastal ecological environment. The models used in this paper show a high correlation coefficient between observed and modeling data, which means that this method can be used to predict the changing trend of shoreline and tidal flat. The research results of present study can provide scientific supports for future coastal protection and management.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000533/pdfft?md5=83cd982ba243f63ce80c5a4e8f619d2f&pid=1-s2.0-S2096519224000533-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78317134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Harmful evaluation of heavy metals from soil layer to the groundwater: Take the Jilin Hunchun Basin as an example","authors":"Xiao-Dong Guo ,&nbsp;Qiang Liu ,&nbsp;Hui-Rong Zhang ,&nbsp;Xu-Fei Shi ,&nbsp;Chuan-Yu Qin ,&nbsp;Zhi-Qiang Zhang","doi":"10.31035/cg2022050","DOIUrl":"10.31035/cg2022050","url":null,"abstract":"<div><p>The continuous enrichment of heavy metals in soils has caused potential harm to groundwater. Quantitative methods to evaluate the harm of heavy metals in soil to groundwater are lacked in previous studies. Based on the theory of groundwater circulation and solid-liquid equilibrium, a simple and easy-to-use flux model of soil heavy metals migrating to groundwater is constructed. Based on groundwater environmental capacity, an innovative method for evaluating the harm of heavy metals in soil to groundwater is proposed, which has been applied in Hunchun Basin, Jilin Province, China. The results show that the fluxes of soil heavy metals into groundwater in the study area are Zn, Cu, As, Pb, Cd, Ni, and Hg in descending order. The content of heavy metals in groundwater (As, Hg, Cu, Pb, Zn, Ni, and Cd) in most areas has not risen to the threshold of environmental capacity within 10 years. The harm levels of soil heavy metals to groundwater in the most townships soils are at the moderate level or below. This evaluation method can quantify the flux of soil heavy metals into groundwater simply and quickly, determine the residual capacity of groundwater to heavy metals, evaluate the harm level of soil heavy metals to groundwater, provide support for relevant departments to carry out environmental protection of soil and groundwater, and provide a reference to carry out similar studies for related scholars.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000600/pdfft?md5=11113c322d6754271213ccb06179f172&pid=1-s2.0-S2096519224000600-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75414386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"LA-ICP-MS zircon U-Pb dating of tuffites in the Sachakou Pb-Zn mining area, Karakorum, Xinjiang and its establishment of Early Triassic strata","authors":"Xiao-jian Zhao ,&nbsp;Nuo Li ,&nbsp;Kai Weng ,&nbsp;Ming Wang ,&nbsp;Qing-lin Sui ,&nbsp;Deng-hui Chen ,&nbsp;Zhou-ping Guo ,&nbsp;Meng-qi Jin","doi":"10.31035/cg2023048","DOIUrl":"10.31035/cg2023048","url":null,"abstract":"","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000636/pdfft?md5=9376bffaa36574d37ec05c59ce9338a0&pid=1-s2.0-S2096519224000636-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84739004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geological conditions and reservoir characteristics of various shales in major shale-hosted regions of China","authors":"Shu-jing Bao ,&nbsp;Tian-xu Guo ,&nbsp;Jin-tao Yin ,&nbsp;Wei-bin Liu ,&nbsp;Sheng-jian Wang ,&nbsp;Hao-han Li ,&nbsp;Zhi Zhou ,&nbsp;Shi-zhen Li ,&nbsp;Xiang-lin Chen","doi":"10.31035/cg2022082","DOIUrl":"https://doi.org/10.31035/cg2022082","url":null,"abstract":"<div><p>China is home to shales of three facies: Marine shale, continental shale, and marine-continental transitional shale. Different types of shale gas are associated with significantly different formation conditions and major controlling factors. This study compared the geological characteristics of various shales and analyzed the influences of different parameters on the formation and accumulation of shale gas. In general, shales in China’s several regions exhibit high total organic carbon (TOC) contents, which lays a sound material basis for shale gas generation. Marine strata generally show high degrees of thermal evolution. In contrast, continental shales manifest low degrees of thermal evolution, necessitating focusing on areas with relatively high degrees of thermal evolution in the process of shale gas surveys for these shales. The shales of the Wufeng and Silurian formations constitute the most favorable shale gas reservoirs since they exhibit the highest porosity among the three types of shales. These shales are followed by those in the Niutitang and Longtan formations. In contrast, the shales of the Doushantuo, Yanchang, and Qingshankou formations manifest low porosities. Furthermore, the shales of the Wufeng and Longmaxi formations exhibit high brittle mineral contents. Despite a low siliceous mineral content, the shales of the Doushantuo Formation feature a high carbonate mineral content, which can increase the shales’ brittleness to some extent. For marine-continental transitional shales, where thin interbeds of tight sandstone with unequal thicknesses are generally found, it is recommended that fracturing combined with drainage of multiple sets of lithologic strata should be employed to enhance their shale gas production.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000624/pdfft?md5=4c575be4d5ba8eebae3dc028c375ebdb&pid=1-s2.0-S2096519224000624-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139699567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Age and geochemical evolution of granite magmatism in Olkhon region from Caledonian syncollisional ore-free granite to the rare metal granite and pegmatite of Middle Paleozoic intraplate setting","authors":"Viktor Antipin ,&nbsp;Valentina Makrygina ,&nbsp;Larisa Kushch ,&nbsp;Nataliya Sheptyakova","doi":"10.31035/cg2023040","DOIUrl":"10.31035/cg2023040","url":null,"abstract":"<div><p>The detailed description of two granite complexes in the Olkhon subterrane is given. The Early Paleozoic Sharanur complex was formed by granitization of gneisses of the Olkhon series. It includes migmatites, granite-gneisses, granites and pegmatites of normal alkalinity; they belong to the type of syncollisional granites. The Middle Paleozoic Aya granite complex includes mother Aya massif of amazonite-bearing granites and several types of rare-metal pegmatites. They have elevated alkalinity, low of Ba, Sr, and high LILE and HFSE elements contents. The Aya pegmatites lie in northwest cracks of stretching and associated with the rise of the territory under the influence of the North Asian plume. These cracks and pegmatites mark the beginning of a new intraplate geodynamic setting. Two geochemical types are distinguished among the pegmatites of this complex. These are amazonite pegmatites of Li-F type with Ta mineralization and complex type pegmatite with Be-Rb-Nb-Ta and Li-F mineralization (the Ilixin vein). The Tashkiney pegmatite vein is similar to Ilixin, but lies in the gneisses of the Olkhon series. It shows high concentrations of Be, Nb, Ta, as well as W, Sn, but lacks Li and F, due to a greater depth and higher temperature of the melt crystallization of this pegmatite.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000569/pdfft?md5=646c9292802440c3f2c847a44a0b0ce4&pid=1-s2.0-S2096519224000569-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86087020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential evaluation of saline aquifers for the geological storage of carbon dioxide: A case study of saline aquifers in the Qian-5 member in northeastern Ordos Basin","authors":"Yan Li ,&nbsp;Peng Li ,&nbsp;Hong-jun Qu ,&nbsp;Gui-wen Wang ,&nbsp;Xiao-han Sun ,&nbsp;Chang Ma ,&nbsp;Tian-xing Yao","doi":"10.31035/cg2023045","DOIUrl":"10.31035/cg2023045","url":null,"abstract":"<div><p>The well-developed coal electricity generation and coal chemical industries have led to huge carbon dioxide (CO₂) emissions in the northeastern Ordos Basin. The geological storage of CO₂ in saline aquifers is an effective backup way to achieve carbon neutrality. In this case, the potential of saline aquifers for CO₂ storage serves as a critical basis for subsequent geological storage project. This study calculated the technical control capacities of CO₂ of the saline aquifers in the fifth member of the Shiqianfeng Formation (the Qian-5 member) based on the statistical analysis of the logging and the drilling and core data from more than 200 wells in the northeastern Ordos Basin, as well as the sedimentary facies, formation lithology, and saline aquifer development patterns of the Qian-5 member. The results show that (1) the reservoirs of saline aquifers in the Qian-5 member, which comprise distributary channel sand bodies of deltaic plains, feature low porosities and permeabilities; (2) The study area hosts three NNE-directed saline aquifer zones, where saline aquifers generally have a single-layer thickness of 3–8 m and a cumulative thickness of 8–24 m; (3) The saline aquifers of the Qian-5 member have a total technical control capacity of CO₂ of 119.25 × 10⁶ t. With the largest scale and the highest technical control capacity (accounting for 61% of the total technical control capacity), the Jinjie-Yulin saline aquifer zone is an important prospect area for the geological storage of CO₂ in the saline aquifers of the Qian-5 member in the study area.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000521/pdfft?md5=383117874fe046aa0596dec4ba06b466&pid=1-s2.0-S2096519224000521-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79869007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mangrove wetlands distribution status identification, changing trend analyzation and carbon storage assessment of China","authors":"Chang Li ,&nbsp;Fu Wang ,&nbsp;Peng Yang ,&nbsp;Fei-cui Wang ,&nbsp;Yun-zhuang Hu ,&nbsp;Yan-lin Zhao ,&nbsp;Li-zhu Tian ,&nbsp;Rui-bin Zhao","doi":"10.31035/cg2023049","DOIUrl":"10.31035/cg2023049","url":null,"abstract":"<div><p>This research investigates the ecological importance, changes, and status of mangrove wetlands along China’s coastline. Visual interpretation, geological surveys, and ISO clustering unsupervised classification methods are employed to interpret mangrove distribution from remote sensing images from 2021, utilizing ArcGIS software platform. Furthermore, the carbon storage capacity of mangrove wetlands is quantified using the carbon storage module of InVEST model. Results show that the mangrove wetlands in China covered an area of 278.85 km² in 2021, predominantly distributed in Hainan, Guangxi, Guangdong, Fujian, Zhejiang, Taiwan, Hong Kong, and Macao. The total carbon storage is assessed at 2.11×10⁶ t, with specific regional data provided. Trends since the 1950s reveal periods of increase, decrease, sharp decrease, and slight-steady increases in mangrove areas in China. An important finding is the predominant replacement of natural coastlines adjacent to mangrove wetlands by artificial ones, highlighting the need for creating suitable spaces for mangrove restoration. This study is poised to guide future mangrove-related investigations and conservation strategies.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S209651922400051X/pdfft?md5=abd372254bbcb39a72aa3cfa15ac1f61&pid=1-s2.0-S209651922400051X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90127441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plume-lithosphere interaction in the Comei Large Igneous Province: Evidence from two types of mafic dykes in Gyangze, south Tibet, China","authors":"Ya-ying Wang ,&nbsp;Ling-sen Zeng ,&nbsp;Li-e Gao ,&nbsp;Li-long Yan ,&nbsp;Ling-hao Zhao ,&nbsp;Jia-hao Gao ,&nbsp;Ying-long Di ,&nbsp;Guang-xu Li ,&nbsp;Yi-hong Tian","doi":"10.31035/cg2023023","DOIUrl":"10.31035/cg2023023","url":null,"abstract":"<div><p>Two suites of mafic dykes, T1193-A and T1194-A, outcrop in Gyangze area, southeast Tibet. They are in the area of Comei LIP and have indistinguishable field occurrences with two other dykes in Gyangze, T0902 dyke with 137.7±1.3 Ma zircon age and T0907 dyke with 142±1.4 Ma zircon age reported by <span>Wang YY et al. (2016)</span>, indicating coeval formation time. Taking all the four diabase dykes into consideration, two different types, OIB-type and weak enriched-type, can be summarized. The “OIB-type” samples, including T1193-A and T0907 dykes, show OIB-like geochemical features and have initial Sr-Nd isotopic values similar with most mafic products in Comei Large Igneous Provinces (LIP), suggesting that they represent melts directly generated from the Kerguelen mantle plume. The “weak enriched-type ” samples, including T1194-A and T0902 dykes, have REEs and trace element patterns showing within-plate affinity but have obvious Nb-Ta-Ti negative anomalies. They show uniform lower <em>ε</em>_Nd(<em>t</em>) values (–6––2) and higher ⁸⁷Sr/⁸⁶Sr(<em>t</em>) values (0.706–0.709) independent of their MgO variation, indicating one enriched mantle source. Considering their closely spatial and temporal relationship with the widespread Comei LIP magmatic products in Tethyan Himalaya, these “weak enriched-type” samples are consistent with mixing of melts from mantle plume and the above ancient Tethyan Himalaya subcontinental lithospheric mantle (SCLM) in different proportions. These weak enriched mafic rocks in Comei LIP form one special rock group and most likely suggest large scale hot mantle plume-continental lithosphere interaction. This process may lead to strong modification of the Tethyan Himalaya lithosphere in the Early Cretaceous.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000570/pdfft?md5=06f477356c3e6a6f9efc0166fa64de7c&pid=1-s2.0-S2096519224000570-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74896089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cassiterite U-Pb dating of the Yelonggou pegmatite-type lithium deposit in western Sichuan and its metallogenic age constraints","authors":"Xiang-yuan Yue ,&nbsp;Qian Zhang ,&nbsp;Jun-jun Zhang ,&nbsp;Wei Zhang ,&nbsp;Jing Zhang ,&nbsp;Zhi-quan Jia ,&nbsp;Li-ping Luo","doi":"10.31035/cg2023047","DOIUrl":"https://doi.org/10.31035/cg2023047","url":null,"abstract":"","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000648/pdfft?md5=03ef34b807a78e4c4d7ae8843c039f03&pid=1-s2.0-S2096519224000648-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139699568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deep-large faults controlling on the distribution of the venting gas hydrate system in the middle of the Qiongdongnan Basin, South China Sea","authors":"Jin-feng Ren ,&nbsp;Hai-jun Qiu ,&nbsp;Zeng-gui Kuang ,&nbsp;Ting-wei Li ,&nbsp;Yu-lin He ,&nbsp;Meng-jie Xu ,&nbsp;Xiao-xue Wang ,&nbsp;Hong-fei Lai ,&nbsp;Jin Liang","doi":"10.31035/cg2023086","DOIUrl":"https://doi.org/10.31035/cg2023086","url":null,"abstract":"<div><p>Many locations with concentrated hydrates at vents have confirmed the presence of abundant thermogenic gas in the middle of the Qiongdongnan Basin (QDNB). However, the impact of deep structures on gas-bearing fluids migration and gas hydrates distribution in tectonically inactive regions is still unclear. In this study, the authors apply high-resolution 3D seismic and logging while drilling (LWD) data from the middle of the QDNB to investigate the influence of deep-large faults on gas chimneys and preferred gas-escape pipes. The findings reveal the following: (1) Two significant deep-large faults, F1 and F2, developed on the edge of the Songnan Low Uplift, control the dominant migration of thermogenic hydrocarbons and determine the initial locations of gas chimneys. (2) The formation of gas chimneys is likely related to fault activation and reactivation. Gas chimney 1 is primarily arises from convergent fluid migration resulting from the intersection of the two faults, while the gas chimney 2 benefits from a steeper fault plane and shorter migration distance of fault F2. (3) Most gas-escape pipes are situated near the apex of the two faults. Their reactivations facilitate free gas flow into the GHSZ and contribute to the formation of fracture - filling hydrates.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000545/pdfft?md5=dab51f4d0a130f0012c385101ea3d530&pid=1-s2.0-S2096519224000545-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139699501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}