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Geology and mineralization of the Hongqiling large magmatic nickel-copper-cobalt deposit (22×104 t) in Jilin Province, China: A review 中国吉林省红旗岭大型岩浆型镍铜钴矿床(22×104 吨)的地质与矿化:综述
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2023106
Cong Chen , Yu-chao Gu , Di Zhang , Tao-tao Wu , Ai Li , Yun-sheng Ren , Qing-qing Shang , Jian Zhang , Xiong-fei Bian , Fei Su , Jia-lin Yang , Qiu-shi Sun , Xiao-hai Li , Wan-zhen Liu , Zhen-ming Sun , Sen Zhang , Yu-hui Feng
{"title":"Geology and mineralization of the Hongqiling large magmatic nickel-copper-cobalt deposit (22×104 t) in Jilin Province, China: A review","authors":"Cong Chen ,&nbsp;Yu-chao Gu ,&nbsp;Di Zhang ,&nbsp;Tao-tao Wu ,&nbsp;Ai Li ,&nbsp;Yun-sheng Ren ,&nbsp;Qing-qing Shang ,&nbsp;Jian Zhang ,&nbsp;Xiong-fei Bian ,&nbsp;Fei Su ,&nbsp;Jia-lin Yang ,&nbsp;Qiu-shi Sun ,&nbsp;Xiao-hai Li ,&nbsp;Wan-zhen Liu ,&nbsp;Zhen-ming Sun ,&nbsp;Sen Zhang ,&nbsp;Yu-hui Feng","doi":"10.31035/cg2023106","DOIUrl":"10.31035/cg2023106","url":null,"abstract":"<div><div>The Hongqiling large nickel-copper-cobalt deposit (hereafter referred to as the Hongqiling deposit), a typical mafic-ultramafic copper-nickel deposit in China, boasts proven Ni (Ni) resources of approximately 22×10<sup>4</sup> t, associated copper resources of 2×10<sup>4</sup> t, and associated cobalt (Co) resources of 0.5×10<sup>4</sup> t, with Ni reserves ranking 10<sup>th</sup> among China’s magmatic nickel deposits. Geotectonically, the Hongqiling deposit is situated in the superimposed zone between the Xing’an-Mongolian orogenic belt and the circum-Western Pacific’s active continental margin belt. Its ore-bearing plutons occur within the metamorphic rocks of the Ordovician Hulan Group, with the emplacement of plutons and the locations of orebodies governed by the deep-seated Huifahe fault and its secondary NW-trending Fujia-Hejiagou-Beixinglong-Changsheng fault zone. In the deposit, the rock assemblages of ore-bearing plutons predominantly encompass gabbro - pyroxenite - olivine pyroxenite - pyroxene peridotite (pluton No. 1) and noriteorthopyroxenite-harzburgite (pluton No. 7), with ore-bearing lithofacies consisting primarily of olivine pyroxenite and pyroxenite facies. The Hongqiling deposit hosts stratoid, overhanging lentoid, veined, and pure-sulfide veined orebodies. Its ores principally contain metallic minerals including pyrrhotite, pentlandite, chalcopyrite, violarite, and pyrite. Despite unidentified magma sources of ore-bearing mafic-ultramafic rocks, it is roughly accepted that the magmatic evolution in the Hongqiling deposit primarily involved fractional crystallization and crustal contamination. The ore-forming materials were primarily derived from the upper mantle, mixed with minor crustal materials. The ore-bearing mafic-ultramafic rocks in the deposit, primarily emplaced during the Indosinian (208–239 Ma), were formed in an intense extension setting followed by the collisional orogeny between the North China Plate and the Songnen-Zhangguangcai Range Block during the Middle-Late Triassic. From the perspective of the metallogenic geological setting, surrounding rocks, ore-controlling structures, and rock assemblages, this study identified one favorable condition and seven significant indicators for prospecting for Hongqiling-type nickel deposits and developed a prospecting model of the Hongqiling deposit. These serve as valuable references for exploring similar nickel deposits in the region, as well as the deep parts and margins of the Hongqiling deposit.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 762-796"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721441","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}
引用次数: 0
Hydrochemical characteristics of surface water in Hengduan mountain region of Eastern Tibet and its response to human activities: A case study of Duoqu Basin, Jinsha River 藏东横断山区地表水水化学特征及其对人类活动的响应:金沙江多曲盆地案例研究
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2023053
Jing-jie Li , Sheng Lian , Ming-guo Wang , Huai-sheng Zhang , Tao Yang
{"title":"Hydrochemical characteristics of surface water in Hengduan mountain region of Eastern Tibet and its response to human activities: A case study of Duoqu Basin, Jinsha River","authors":"Jing-jie Li ,&nbsp;Sheng Lian ,&nbsp;Ming-guo Wang ,&nbsp;Huai-sheng Zhang ,&nbsp;Tao Yang","doi":"10.31035/cg2023053","DOIUrl":"10.31035/cg2023053","url":null,"abstract":"<div><div>The analysis of hydrochemical characteristics and influencing factors of surface river on plateau is helpful to study water hydrological cycle and environmental evolution, which can scientifically guide rational development and utilization of water resources and planning of ecological environment protection. With the expansion and diversification of human activities, the quality of surface rivers will be more directly affected. Therefore, it is of great significance to pay attention to the hydrochemical characteristics of plateau surface rivers and the influence of human activities on their circulation and evolution. In this study, surface water in the Duoqu basin of Jinsha River located in Hengduan mountain region of Eastern Tibet was selected as the representative case. Twenty-three groups of surface water samples were collected to analyze the hydrochemical characteristics and ion sources based on correlation analysis, piper trigram, gibbs model, hydrogen and oxygen isotopic techniques. The results suggest the following: (1) The pH showed slight alkalinity with the value ranged from 7.25 to 8.62. Ca<sup>2+</sup>, Mg<sup>2+</sup> and HCO<sub>3</sub><sup>–</sup> were the main cations and anions. HCO<sub>3</sub>-Ca and HCO<sub>3</sub>-Ca·Mg were the primary hydrochemical types for the surface water of Duoqu River. The correlation analysis showed that TDS had the most significant correlation with Ca<sup>2+</sup>, Mg<sup>2+</sup> and HCO<sub>3</sub><sup>–</sup>. Analysis on hydrogen and oxygen isotopes indicated that the surface rivers were mainly recharged by atmospheric precipitation and glacial melt water in this study area. (2) The surface water had a certain reverse cation alternating adsorption, and surface water ions were mainly derived from rock weathering, mainly controlled by weathering and dissolution of carbonates, and secondly by silicates and sodium rocks. (3) The influence of human activities was weak, while the development of cinnabar minerals had a certain impact on the hydrochemistry characteristics, which was the main factor for causing the increase of SO<sub>4</sub><sup>2–</sup>. The densely populated county towns and temples with frequent incense burning activities may cause some anomalies of surface water quality. At present, the Duoqu River watershed had gone through a certain influence of mineral exploitation, so the hydrological cycle and river ecoenvironment at watershed scale will still bound to be change. The results could provide basic support for better understanding water balance evolution as well as the ecological protection of Duoqu River watershed.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 630-641"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721457","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}
引用次数: 0
Sedimentary environment and organic matter accumulation of Wufeng-Longmaxi shales, southwest Yangtze Plate, China: Insights from geochemical and petrological evidence 中国长江西南板块五峰-龙马溪页岩的沉积环境与有机质积累:地球化学和岩石学证据的启示
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2022074
An-kun Zhao , Dong Wang , Qian Zhang , Zi-hui Lei , Qian Yu , Di Zhang , Ye-xin Zhou
{"title":"Sedimentary environment and organic matter accumulation of Wufeng-Longmaxi shales, southwest Yangtze Plate, China: Insights from geochemical and petrological evidence","authors":"An-kun Zhao ,&nbsp;Dong Wang ,&nbsp;Qian Zhang ,&nbsp;Zi-hui Lei ,&nbsp;Qian Yu ,&nbsp;Di Zhang ,&nbsp;Ye-xin Zhou","doi":"10.31035/cg2022074","DOIUrl":"10.31035/cg2022074","url":null,"abstract":"<div><div>Upper Ordovician–Lower Silurian Wufeng-Longmaxi Formation is the most developed strata of shale gas in southern China. Due to the complex sedimentary environment adjacent to the Kangdian Uplift, the favorable area for organic-rich shale development is still undetermined. The authors, therefore, focus on the mechanism of accumulation of organic matter and the characterization of the sedimentary environment of the Wufeng-Longmaxi Shales to have a more complete understanding and new discovering of organic matter enrichment and favorable area in the marginal region around Sichuan Basin. Multiple methods were applied in this study, including thin section identification, scanning electron microscopy (SEM) observations and X-ray diffraction (XRD), and elemental analysis on outcrop samples. Five lithofacies have been defined according to the mineralogical and petrological analyses, including mudstone, bioclastic limestone, silty shale, dolomitic shale, and carbonaceous siliceous shale. The paleo-environments have been reconstructed and the organic enrichment mechanism has been identified as a reduced environment and high productivity. The Wufeng period is generally a suboxic environment and the early Longmaxi period is a reducing environment based on geochemical characterization. High dolomite content in the study area is accompanied by high TOC, which may potentially indicate the restricted anoxic environment formed by biological flourishing in shallower water. And for the area close to the Kangdian Uplift, the shale gas generation capability is comparatively favorable. The geochemical parameters implied that new favorable areas for shale gas exploration could be targeted, and more shale gas resources in the mountainbasin transitional zone might be identified in the future.</div></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":"7 4","pages":"Pages 747-761"},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722183","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}
引用次数: 0
Pacific oyster (Crassostrea gigas) shell growth duration in a year in Bohai Bay and implication for its carbon sink potential 渤海湾太平洋牡蛎(Crassostrea gigas)一年中贝壳生长持续时间及其对碳汇潜力的影响
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2023054
Wen-yu Wang , Chang-fu Fan , Zhao-jun Song , Hong Wang , Fu Wang
{"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><sup>18</sup>O 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}
引用次数: 0
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 7.0-8.5 级地震区交通工程建设地质风险评估:来自青藏高原东部川藏交通走廊的实践
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2023055
Ning Zhong , Xian-bing Zhang , Chang-bao Guo , Zhen Yang , Hao Yu , Rui-an Wu , Yang Wang , Hai-bing Li
{"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><sub>S</sub> ≥ 7.0 earthquakes, the largest earthquake is 1950 Chayu <em>M</em><sub>S</sub> 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><sub>S</sub> ≥ 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}
引用次数: 0
Apatite and zircon (U-Th)/He dating of sandstone in the Weibei Uplift, Ordos Basin and its revealed Eocene rapid uplift denudation event 鄂尔多斯盆地渭北隆起带砂岩的磷灰石和锆石(U-Th)/He年代测定及其揭示的始新世快速隆起剥蚀事件
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2023064
Peng Gao , Sheng-biao Hu
{"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}
引用次数: 0
In situ U-Pb dating and trace elements of magmatic rutile from Mujicun Cu-Mo deposit, North China Craton: Insights into porphyry mineralization 华北克拉通穆吉村铜钼矿床岩浆金红石的原位 U-Pb 定年和痕量元素:斑岩成矿的启示
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2023038
Fan Yang , Jing-wen Mao , Wei-dong Ren , Jia-run Tu , Gilby Jepson , Si-yuan Meng , Zhi-min Wang
{"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 (TiO<sub>2</sub>) 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}
引用次数: 0
Multi-stage formation of the Feragen ophiolite, Norway: Implication from petrology and geochemistry of peridotites and chromitites and its potential for prospecting 挪威费拉根蛇绿岩的多阶段形成:橄榄岩和铬铁矿岩石学和地球化学的影响及其勘探潜力
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2023017
Tian Qiu , Fa-hui Xiong , David G. Gee , Yuan Li , Jing-sui Yang
{"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, Al<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub>, MgO, and REE contents corresponding to abyssal peridotites, whereas dunites have low CaO, Al<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub>, MgO, and REE contents corresponding to SSZ peridotites. The Cr# and TiO<sub>2</sub> 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 ƒO<sub>2</sub> 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}
引用次数: 0
Hydrochemistry of the lakes in the southern Badain Jaran Desert and its paleosalinity reconstruction 巴丹吉林沙漠南部湖泊的水化学及其古盐度重建
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2023057
Gao-lei Jiang , Zhe Wang , Zhen-long Nie , Zhong-shuang Cheng , Pu-cheng Zhu , Le Cao , Jian-mei Shen
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引用次数: 0
Carbon neutrality: China’s energy transition over the past decade 碳中和:中国过去十年的能源转型
IF 4.6 3区 地球科学
China Geology Pub Date : 2024-10-25 DOI: 10.31035/cg2024086
Li-qiong Jia , Xi-jie Chen , Zi-guo Hao
{"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}
引用次数: 0
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