China Geology最新文献

{"title":"Pacific oyster (Crassostrea gigas) shell growth duration in a year in Bohai Bay and implication for its carbon sink potential","authors":"Wen-yu Wang ,&nbsp;Chang-fu Fan ,&nbsp;Zhao-jun Song ,&nbsp;Hong Wang ,&nbsp;Fu Wang","doi":"10.31035/cg2023054","DOIUrl":"10.31035/cg2023054","url":null,"abstract":"<div><div>Oyster is a bivalve mollusk widely distributed in estuarine and shallow sea environments. Its growth and burial process is a carbon sequestration and storage process. Oyster shell may stop growing due to suffer from freeze shock during the winter season within a temperate climate, therefore, in order to study the carbon sequestration capacity of oysters we need to know the water temperature at which the shell suffer from winter freeze shock. This study examines <em>δ</em>¹⁸O profiles across consecutive micro-growth layers found in three modern Pacific oyster shells from the northwest coast of Bohai Bay. A total of 165 oxygen isotope values from sequential samples of their left shells showed periodically varying values, and the variation fluctuation of oxygen isotope values was 4.97‰ on average. According to the variation range of the oxygen isotope value of the shell, combined with the sea surface temperature and the sea surface salinity data of the water in which the oysters grew, the water temperature that suffer from winter freeze shock and stops or retards the growth of Pacific oysters in Bohai Bay is about 8.3°C, and the corresponding period is from December to March of the following year. The calcification time of oysters within one year is nearly a month longer than previously thought, therefore, its carbon sink potential is also improved.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 653-660"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78237140","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 risk assessment of traffic engineering construction among 7.0–8.5 magnitude earthquake areas: Practice from the Sichuan-Tibet transport corridor in the eastern Tibetan Plateau","authors":"Ning Zhong ,&nbsp;Xian-bing Zhang ,&nbsp;Chang-bao Guo ,&nbsp;Zhen Yang ,&nbsp;Hao Yu ,&nbsp;Rui-an Wu ,&nbsp;Yang Wang ,&nbsp;Hai-bing Li","doi":"10.31035/cg2023055","DOIUrl":"10.31035/cg2023055","url":null,"abstract":"<div><div>At least 13 active fault zones have developed in the Ya’an-Linzhi section of the Sichuan-Tibet transport corridor, and there have been undergone 17 <em>M</em>_S ≥ 7.0 earthquakes, the largest earthquake is 1950 Chayu <em>M</em>_S 8.5 earthquake, which has very strong seismic activity. Therefore, carrying out engineering construction in the Sichuan-Tibet transport corridor is a huge challenge for geological technological personnel. To determining the spatial geometric distribution, activity of active faults and geological safety risk in the Sichuan-Tibet transport corridor. Based on remote sensing images, ground surveys, and chronological tests, as well as the deep geophysical and current GPS data, we investigated the geometry, segmentation, and paleoearthquake history of five major active fault zones in the Ya’an-Linzhi section of the Sichuan-Tibet transport corridor, namely the Xianshuihe, Litang, Batang, Jiali-Chayu and Lulang-Yigong. The five major fault zones are all Holocene active faults, which contain strike-slip components as well as thrust or normal fault components, and contain multiple branch faults. The Selaha-Kangding segment of the Xianshuihe fault zone, the Maoyaba and Litang segment of the Litang fault zone, the middle segment (Yigong-Tongmai-Bomi) of Jiali-Chayu fault zone and Lulang-Yigong fault zone have the risk of experiencing strong earthquakes in the future, with a high possibility of the occurrence of <em>M</em>_S ≥ 7.0 earthquakes. The Jinsha River and the Palong-Zangbu River, which is a high-risk area for geological hazard chain risk in the Ya’an-Linzhi section of the Sichuan-Tibet transport corridor. Construction and safe operation Ya’an-Linzhi section of the Sichuan-Tibet transport corridor, need strengthen analysis the current crustal deformation, stress distribution and fault activity patterns, clarify active faults relationship with large earthquakes, and determine the potential maximum magnitude, epicenters, and risk range. This study provides basic data for understanding the activity, seismicity, and tectonic deformation patterns of the regional faults in the Sichuan-Tibet transport corridor.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 605-629"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721456","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":"Apatite and zircon (U-Th)/He dating of sandstone in the Weibei Uplift, Ordos Basin and its revealed Eocene rapid uplift denudation event","authors":"Peng Gao ,&nbsp;Sheng-biao Hu","doi":"10.31035/cg2023064","DOIUrl":"10.31035/cg2023064","url":null,"abstract":"","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 797-800"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721442","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":"Hydrochemistry of the lakes in the southern Badain Jaran Desert and its paleosalinity reconstruction","authors":"Gao-lei Jiang ,&nbsp;Zhe Wang ,&nbsp;Zhen-long Nie ,&nbsp;Zhong-shuang Cheng ,&nbsp;Pu-cheng Zhu ,&nbsp;Le Cao ,&nbsp;Jian-mei Shen","doi":"10.31035/cg2023057","DOIUrl":"10.31035/cg2023057","url":null,"abstract":"<div><div>The reconstruction of paleohydrology, especially paleosalinity, is an important component of paleoenvironmental research. Researches on the modern characteristics of lake water chemistry and the relationship between lake salinity and hydrochemistry are the basis of paleoenvironment reconstruction. The modern hydrochemical characteristics and the relationship between ion composition and salinity of modern lakes are the basis of paleosalinity reconstruction. In this study, hydrochemical analysis of 21 lakes in the Badain Jaran Desert (BJD) was carried out. The relationships between the Sr/Ca and Mg/Ca ratios and total dissolved solids (TDS) were analyzed. The results show that Na⁺, K⁺, Cl⁻ and SO₄²⁻ have high positive correlations with TDS, and Mg²⁺, Sr²⁺, CO₃²⁻ and HCO₃⁻ have lower correlations with TDS. The Sr/Ca and Mg/Ca ratios do not increase linearly with TDS. Hydrochemical analysis indicates that the studied lakes are in the carbonate precipitation stage and that evaporation is the main factor controlling lake evolution in the BJD. The relationships between the Mg/Ca and Sr/Ca ratios and TDS are mainly influenced by lake evolution stage and the hydrochemical types of the lakes. On the basis of comprehensive previous studies, the factors affecting lake evolution, the Mg and Sr partition coefficients and other hydrochemical parameters that change with lake evolution all affect the relationship between chemical composition and salinity. To reconstruct paleosalinity more accurately, more detailed research on the modern hydrochemical characteristics of lakes and the relationship between the element ratios of carbonates and water salinity should be carried out.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 642-652"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74511525","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":"Multi-stage formation of the Feragen ophiolite, Norway: Implication from petrology and geochemistry of peridotites and chromitites and its potential for prospecting","authors":"Tian Qiu ,&nbsp;Fa-hui Xiong ,&nbsp;David G. Gee ,&nbsp;Yuan Li ,&nbsp;Jing-sui Yang","doi":"10.31035/cg2023017","DOIUrl":"10.31035/cg2023017","url":null,"abstract":"<div><div>The ultramafic massif of Feragen, which belongs to the eastern ophiolitic belt of Norway, has abundant amounts of chromite ores. Recent studies have revealed a complex melt evolution in a supra-subduction zone (SSZ) environment. This study presents new whole-rock major element, trace element, and platinum-group element chemistry to evaluate their petrogenesis and tectonic evolution. Harzburgites have high CaO, Al₂O₃, TiO₂, MgO, and REE contents corresponding to abyssal peridotites, whereas dunites have low CaO, Al₂O₃, TiO₂, MgO, and REE contents corresponding to SSZ peridotites. The Cr# and TiO₂ of chromian spinels in the harzburgites suggest as much as about 15%–20% melting and the dunites are more depleted with &gt; 40% melting. The harzburgites and the dunites and high-Cr chromitites represent, respectively, the products of low-degree partial melting in a back-arc setting, and the products of melt-rock interaction in a SSZ environment. The calculated ƒO₂ values for dunites and high-Cr chromitites (−0.17 – +0.23 and +2.78 – +5.65, respectively and generally above the FMQ buffer) are also consistent with the interaction between back-arc ophiolites with oxidized boninitic melts in a SSZ setting.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 686-701"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722158","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":"In situ U-Pb dating and trace elements of magmatic rutile from Mujicun Cu-Mo deposit, North China Craton: Insights into porphyry mineralization","authors":"Fan Yang ,&nbsp;Jing-wen Mao ,&nbsp;Wei-dong Ren ,&nbsp;Jia-run Tu ,&nbsp;Gilby Jepson ,&nbsp;Si-yuan Meng ,&nbsp;Zhi-min Wang","doi":"10.31035/cg2023038","DOIUrl":"10.31035/cg2023038","url":null,"abstract":"<div><div>Porphyry Cu (Mo-Au) deposit is one of the most important types of copper deposit and usually formed under magmatic arc-related settings, whilst the Mujicun porphyry Cu-Mo deposit in North China Craton uncommonly generated within intra-continental settings. Although previous studies have focused on the age, origin and ore genesis of the Mujicun deposit, the ore-forming age, magma source and tectonic evolution remain controversial. Here, this study targeted rutile (TiO₂) in the ore-hosting diorite porphyry from the Mujicun Cu-Mo deposit to conduct <em>in situ</em> U-Pb dating and trace element composition studies, with major views to determine the timing and magma evolution and to provide new insights into porphyry Cu-Mo metallogeny. Rutile trace element data show flat-like REE patterns characterized by relatively enrichment LREEs and depleted HREEs, which could be identified as magmatic rutile. Rutile U-Pb dating yields lower intercept ages of 139.3–138.4 Ma, interpreted as post magmatic cooling timing below about 500°C, which are consistent or slightly postdate with the published zircon U-Pb ages of diorite porphyry (144.1–141.7 Ma) and skarn (146.2 Ma; 139.9 Ma) as well as the molybdenite Re-Os ages of molybdenum ores (144.8–140.0 Ma). Given that the overlap between the closure temperature of rutile U-Pb system and ore-forming temperature of the Mujicun deposit, this study suggests that the ore-forming ages of the Mujicun deposit can be constrained at 139.3–138.4 Ma, with temporal links to the late large-scale granitic magmatism at 138–126 Ma in the Taihang Orogen. Based on the Mg and Al contents in rutile, the magma of ore-hosting diorite porphyry was suggested to be derived from crust-mantle mixing components. In conjunction with previous studies in Taihang Orogen, this study proposes that the far-field effect and the rollback of the subducting Paleo-Pacific slab triggered lithospheric extension, asthenosphere upwelling, crust-mantle interaction and thermo-mechanical erosion, which jointly facilitated the formation of dioritic magmas during the Early Cretaceous. Subsequently, the dioritic magmas carrying crust-mantle mixing metallic materials were emplaced and precipitated at shallow positions along NNE-trending ore-controlling faults, eventually resulting in the formation of the Mujicun Cu-Mo deposit within an intracontinental extensional setting.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 730-746"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722182","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":"Carbon neutrality: China’s energy transition over the past decade","authors":"Li-qiong Jia ,&nbsp;Xi-jie Chen ,&nbsp;Zi-guo Hao","doi":"10.31035/cg2024086","DOIUrl":"10.31035/cg2024086","url":null,"abstract":"","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 803-806"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721444","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":"Metallogenic characteristics of Shitoukengde intrusion and its implications for Ni-Co-(Cu) sulfide mineralization in East Kunlun","authors":"Xue-peng Duan ,&nbsp;Fan-cong Meng ,&nbsp;Zong-qi Wang ,&nbsp;Xiao-fei Yu","doi":"10.31035/cg2023070","DOIUrl":"10.31035/cg2023070","url":null,"abstract":"<div><div>Xiarihamu deposit is the only super-large Ni-Co deposit found in East Kunlun orogenic belt (EKOB) until present. Shitoukengde (STKD) intrusion is considered to have the potential to become a large Ni-Co deposit in East Kunlun. In order to discuss the metallogenic potential, this study present petrographical, geochemical data, and zircon U-Pb dating for the STKD intrusion. The STKD intrusion is hosted within mafic-ultramafic rocks which contain peridotite, pyroxenite and gabbro, and mainly intruded into the marble of the Paleoproterozoic Jinshuikou Group. Harzburgite and orthopyroxenite are the main country rocks for the Cu-Ni sulfide mineralization. Combine with the positive <em>ε</em>_Hf(t) values (+1.1 to +8.6) of zircons, the enrichment of LILEs, depletion of HFSEs, and lower Ce/Pb ratios of whole rocks indicate that the parental magma was originated from the depleted asthenospheric mantle and experienced 5%–15% crustal contamination. Troctolite formed during the Early Devonian and it has weighted mean ²⁰⁶Pb/²³⁸U age of 412 Ma. Regional background information has indicated that the post-collisional extension setting has already existed during the Early Devonian, leading to the formation of STKD intrusion and Cu-Ni sulfide mineralization. STKD intrusion may have the potential to be one economic Cu-Ni sulfide deposit but seems unlikely to be a super-large one.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 714-729"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721446","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":"Arsenic and fluoride co-enrichment of groundwater in the loess areas and associated human health risks: A case study of Dali County in the Guanzhong Basin","authors":"Rui-ping Liu ,&nbsp;Fei Liu ,&nbsp;Hua-qing Chen ,&nbsp;Yu-ting Yang ,&nbsp;Hua Zhu ,&nbsp;You-ning Xu ,&nbsp;Jian-gang Jiao ,&nbsp;Refaey M El-Wardany","doi":"10.31035/cg2024015","DOIUrl":"10.31035/cg2024015","url":null,"abstract":"<div><div>This study aims to reveal the occurrence and origin of typical groundwater with high arsenic and fluoride concentrations in the loess area of the Guanzhong Basin—a Neogene faulted basin. Key findings are as follows: (1) Groundwater samples with high arsenic and fluoride concentrations collected from the loess area and the terraces of the Weihe River accounted for 26% and 30%, respectively, of the total samples, with primary hydrochemical type identified as HCO₃-Na. The karst and sand areas exhibit relatively high groundwater quality, serving as preferred sources for water supply. It is recommended that local governments fully harness groundwater in these areas; (2) groundwater with high arsenic and fluoride concentrations in the loess area and the alluvial plain of rivers in Dali County is primarily distributed within the Guanzhong Basin, which represents the drainage zone of groundwater; (3) arsenic and fluoride in groundwater originate principally from natural and anthropogenic sources; (4) the human health risk assessments reveal that long-term intake of groundwater with high arsenic and fluoride concentrations pose cancer or non-cancer risks, which are more serious to kids compared to adults. This study provides a theoretical basis for the prevention and treatment of groundwater with high arsenic and fluoride concentrations in loess areas.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 3","pages":"Pages 445-459"},"PeriodicalIF":4.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142419035","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":"Muscovite 40Ar/39Ar isotopic dating of pegmatite veins in the Bieyesamas rare metal deposit in the Altay Mountain, Xinjiang, northwestern China","authors":"","doi":"10.31035/cg2023044","DOIUrl":"10.31035/cg2023044","url":null,"abstract":"","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 3","pages":"Pages 589-591"},"PeriodicalIF":4.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79772502","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}