Journal of Asian Earth Sciences最新文献

{"title":"A study of crustal deformation beneath the Qinling Orogenic belt, Central China based on receiver function data","authors":"Ya Sun ,&nbsp;Yangyi Deng ,&nbsp;Syed-Muzyan Shahzad ,&nbsp;Bo Chen","doi":"10.1016/j.jseaes.2024.106404","DOIUrl":"10.1016/j.jseaes.2024.106404","url":null,"abstract":"<div><div>A joint shear wave splitting technique based on receiver function data is employed to invert the crustal anisotropy, Moho depth, and Vp/Vs ratio in the Qinling Orogenic belt (QOB). Our findings reveal a relatively low Vp/Vs ratio (∼1.74) and a thin crust in east QOB. This suggests that potential crustal flow from central Tibet may not significantly influence the crustal deformation in east QOB. Our results demonstrate high Vp/Vs ratios (∼1.75–1.88), thick crust (∼44–56 km), and significant crustal anisotropy with a delay time of 0.22–0.86 s in south QOB, Dabashan, and west QOB regions. The fast directions of crustal anisotropy in the south QOB and Dabashan areas are NW-SE, which reflect the orientation of crustal fabrics associated with the collision between the North China Block and the South China Block. However, weak or negligible splitting times are observed beneath the Shennongjia-Huangling (SNHL), Hannan-Micang (HNMC) domes, and Jianghan Basin. The presence of weak crustal anisotropy is likely related to the stable basements beneath two domes, while the negligible splitting time beneath the Jianghan Basin might be attributed to the nearly vertical α-axis of olivines or mica associated with a subvertical mantle flow caused by slab break-off of the subducted Yangtze Block. The underlying magmas have gathered in the lower crust and formed the mafic lower crust, which cause an increase in the crust Vp/Vs ratio and crustal extension.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106404"},"PeriodicalIF":2.7,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Zircon and garnet U-Pb dating reveals the mineralization history of volcanic-related skarn iron deposits","authors":"ZhiYuan Sun ,&nbsp;MingLiang Wang ,&nbsp;YongGang Sun ,&nbsp;XiaoQiang Zhu ,&nbsp;Tao Yang","doi":"10.1016/j.jseaes.2024.106401","DOIUrl":"10.1016/j.jseaes.2024.106401","url":null,"abstract":"<div><div>The genesis of skarn garnet in volcanic-related skarn iron deposits is controversial because of the absent or ambiguous spatiotemporally related intrusions. In this study, we present combined LA-ICP-MS garnet U-Pb and SHRIMP zircon U-Pb ages to determine the spatiotemporal relationship between skarn garnet and a potentially related intrusion or causative volcanic rock. Three types of garnet (Grt1, Grt2, and Grt3) are identified in the Yamansu deposit, and Grt1 yields a lower intercept age of 326 ± 9 Ma (n = 32, MSWD = 0.3). SHRIMP zircon U-Pb dating of the associated volcanic rock yields a weighted mean age of 327 ± 3 Ma (n = 10, MSWD = 1.4), suggesting an isochronous relationship between the volcanic rock and Grt1. Grt2 and Grt3 yield lower intercept ages of 316 ± 6 Ma (n = 22, MSWD = 1.4) and 315 ± 6 Ma (n = 35, MSWD = 1.5), respectively. However, the zircon U-Pb weighted mean age of 252 ± 4 Ma (n = 5, MSWD = 0.8) obtained from the associated intrusion is obviously younger than the skarn age and the previously reported ore-forming age, implying no temporal relationship between mineralization and the intrusion. More significantly, precise ²⁰⁶Pb/²³⁸U weighted mean ages of 325 ± 9 Ma (n = 15, MSWD = 0.3), 316 ± 8 Ma (n = 11, MSWD = 0.4), and 319 ± 7 Ma (n = 12, MSWD = 0.5) were obtained from Grt1, Grt2, and Grt3, respectively, and we find that andradite-rich garnet with high U and ΣREE concentrations has the potential to yield the more precise U-Pb ages. The combined garnet and zircon U-Pb ages reveal that the hydrothermal skarn and mineralization in volcanic-related skarn iron deposits are related to volcanic activity rather than intrusions. Multiple episodes of volcanic-related hydrothermal activity may have caused multiple phases of skarn formation and mineralization in volcanic-related skarn iron deposits.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106401"},"PeriodicalIF":2.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rock-ice avalanche-generated erosion behaviors at the Sedongpu gully, Tibet, China: New insights from the geomorphologic perspective","authors":"Tiantian Zhang ,&nbsp;Kai He ,&nbsp;Bin Li ,&nbsp;Yueping Yin ,&nbsp;Haoyuan Gao ,&nbsp;Shaohua Gao","doi":"10.1016/j.jseaes.2024.106403","DOIUrl":"10.1016/j.jseaes.2024.106403","url":null,"abstract":"<div><div>In recent years, massive rock-ice avalanches frequently occur in the Sedongpu gully, forming an extensive dammed lake. Rock-ice avalanches not only threaten residents living in upstream and downstream areas, but also significantly change geomorphology. The gully geomorphology also experienced complicated alterations, due to distal motion distance and strong entrainment of debris flows, coming from the conversion of rock-ice avalanches. This study aims to determine the relation between dynamics erosion of rock-ice avalanches and geomorphology evolution during rock-ice avalanche events at the Sedongpu gully, where a large amount of moraine was distributed with five branch ditches. Field investigations, digital elevation models (DEMs), unmanned aerial vehicles (UAVs), multiphase remote-sensing images, topographic profiling, and InSAR monitoring are carried out to characterise the material changes, including composition, structure, transition, and deposits. Materials were entrained and scraped by debris flows and transported into the Yarlung Zangbo River. The total erosion volume of materials on the valley floor reached 980 million m³ from 2010 to 2021. Topographical profiling suggests that the most severe erosion also occurred in the midstream Sedongpu gully, with the maximum width of above 500 m. The overall elevation of the downstream valley increased by 50 m due to continuous deposits, and formed a large debris fans. The results might be helpful in further studies to reveal dynamic erosion geomorphology of rock-ice avalanches.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106403"},"PeriodicalIF":2.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrical architecture across the Ridge-Fault structure in the seismically active Jind-Rohtak-Delhi regions, NW India: Imaged from magnetotellurics studies","authors":"Amit Kumar ,&nbsp;C.K. Rao","doi":"10.1016/j.jseaes.2024.106407","DOIUrl":"10.1016/j.jseaes.2024.106407","url":null,"abstract":"<div><div>The Delhi region is principally seismically active in the process of the India-Asia collision. Therefore, broadband Magnetotelluric (MT) studies were carried out at 11 stations along NW-SE profile passing through Jind-Rohtak regions. The rotation of the impedance tensor showed a regional strike angle of N8^oW, and phase tensor response approximate the 2-D structure. Therefore, electrical crustal structure was obtained from joint TE- and TM-modes data using a 2-D nonlinear conjugate gradient algorithm. The outcomes showed a ∼300 m thick sediments layer with conductivity ∼1 Ω-m beneath the entire profile, and conductor C2 revealed in the upper crust that joins the surface conductive layer. The conductors C1 and C3 are crustal features associated with Lahore-Delhi Ridge (LDR) and Delhi-Haridwar Ridge (DHR), respectively. The NNE-SSW trending Mahendragarh-Dehradun Fault (MDF) parallel to the DHR is suggested northwest dipping. The high conductivity supports the source of serpentine minerals in the lower crust. Our inference that the two ridges may be connected in the lower crust in the study region, and suggesting a triple junction. The fault zone tectonically associated with Himalayan arc, seismicity in the region occurs due to the movement of deep-seated heat in the process subduction. The surface conductive layer is attributed to Pleistocene age alluvium materials (silts and clays), and conductors are interpreted the partial melt or fluids that migrate upward through the pathway.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106407"},"PeriodicalIF":2.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrological and geochronological constraints on the genesis of the Foping gneiss dome, South Qinling Belt, central China","authors":"Zhihui Liu ,&nbsp;Longyao Chen ,&nbsp;Xiaochun Liu ,&nbsp;Bin Fu ,&nbsp;Juan Hu ,&nbsp;Guanggao Zheng","doi":"10.1016/j.jseaes.2024.106406","DOIUrl":"10.1016/j.jseaes.2024.106406","url":null,"abstract":"<div><div>The Foping dome in the South Qinling Belt is a typical gneiss dome that records a multi-stage tectonic evolution from <em>syn</em>-collisional orogenesis to post-orogenic extension. We conducted a detailed petrological and geochronological investigation to constrain the genesis of the dome and its tectonic implications. Field occurrence, mineral assemblage, and metamorphic grade were used to divide the rocks of the Foping dome into three tectonic units. Conventional thermobarometry and pseudosection modelling were used to estimate the P-T conditions of the three units, yielding 640–680 °C and 3.4–5.0 kbar for the upper unit, 690–740 °C and 4.8–7.8 kbar for the middle unit, and 770–800 °C and 5.1–6.8 kbar for the lower unit, corresponding to amphibolite to granulite facies metamorphism under a geothermal gradient of ∼35 °C/km. The metamorphic patterns of three units reveal a metamorphic zonation characterized by decreasing metamorphic temperature from the centre to the periphery of the dome. Monazite SHRIMP U-Pb dating of metapelites yielded two major age clusters at 214–210 Ma and 207–197 Ma. The former cluster represents the timing of early regional progressive metamorphism induced by crustal thickening in a compressional setting, and the latter represents the timing of subsequent thermal metamorphism induced by magmatic diapirism in an extensional setting. The metamorphic zonation characteristics and ages of the Foping dome match with the pattern, nature, and ages of magmatism in this area, suggesting that the dome was formed by magmatic diapirism in a post-collisional extensional setting that was superimposed on the preceding progressive metamorphism associated with crustal thickening.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106406"},"PeriodicalIF":2.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Abundance and origin of helium in the Lower Paleozoic gas: A case study from the Daniudi field of the Ordos Basin, central China","authors":"Xiaoqi Wu ,&nbsp;Quanyou Liu ,&nbsp;Chunhua Ni ,&nbsp;Ping Wang ,&nbsp;Dongya Zhu ,&nbsp;Huichong Jia","doi":"10.1016/j.jseaes.2024.106405","DOIUrl":"10.1016/j.jseaes.2024.106405","url":null,"abstract":"<div><div>Natural gas from ancient strata in sedimentary basins tends to be enriched with helium (He). Lower Paleozoic gas in the Daniudi field (DNDF) of the Ordos Basin in central China provides a good case study to reveal He generation and accumulation mechanisms in deep strata. Understanding He accumulation in the Daniudi field is crucial because the increasing global demand for He requires the identification of new sources in existing natural gas reservoirs. Here, the geochemical characteristics of Lower Paleozoic gas from the DNDF are investigated, aiming to reveal the concentration, origin, and controlling factors of He accumulation. Natural gas in Lower Ordovician Majiagou Formation (O₁m) reservoirs is He-depleted (0.0126 %–0.0187 %, mean 0.0153 %). The ³He/⁴He and corresponding R/Ra ratios range from 3.12 to 3.95 × 10⁻⁸ and 0.022 to 0.028, respectively, indicative of a crustal origin of He. The He concentration was diluted by alkane gases, as indicated by a negative correlation between He content and the CH₄ content, as well as the dryness coefficient; however, it was not affected by the degree of thermal maturity or the type of organic matter in the source rocks, as indicated by a lack of correlation between He content and the carbon isotopic ratios of CH₄ and C₂H₆. The N₂/He ratio of O₁m gas is generally in a range from 1.14 to 7.65, which is markedly lower than the ratio (19–50) in natural gas with He commercial production value (He% ≥ 0.1 %). The He content in O₁m gas is negatively correlated with the content of total dissolved solids (TDS) in formation water; the low He content may be attributable to the high TDS content. The pressure in Paleozoic strata of the DNDF has decreased since the Late Cretaceous due to continuous regional uplift, resulting in decreased He solubility in the formation water and the exsolution of previously dissolved He into gas pools.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106405"},"PeriodicalIF":2.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal variations of non-seismically fatal landslides in Northwest China: A case study from Shaanxi province","authors":"Baoqin Lian ,&nbsp;Jianbing Peng ,&nbsp;Qiangbing Huang ,&nbsp;Jiading Wang ,&nbsp;Xingang Wang ,&nbsp;Sheng Hu ,&nbsp;Kai Liu","doi":"10.1016/j.jseaes.2024.106389","DOIUrl":"10.1016/j.jseaes.2024.106389","url":null,"abstract":"<div><div>Landslides are one of the devastating geo-hazards that result in severe casualties in Northwest China (NW China) every year. However, a comprehensive landslide database is yet to be available for quantitatively assessing the distribution of fatal landslides in NW China. To investigate the spatiotemporal characteristics of non-seismically fatal landslides in NW China, we carried out a study using fatal landslides that occurred in Shaanxi province as an example to construct a new database by incorporating data of fatal landslides that occurred in the period between 1996 and 2018. A total of 332 non-seismically fatal landslides that claimed 1132 lives were compiled in this database. Additionally, a thorough study of spatial and temporal variations of fatal landslides reveals that anthropogenic landslides occur approximately evenly throughout the year. Natural fatal landslides, however, rise noticeably in July, August, and September. The spatial distribution analysis showed that fatal landslides in Shaanxi province of China were mainly distributed in the An’ kang, Yan’an, and Shangluo regions. Additionally, areas with relatively high relief (46.1 to 123 m), steep–slope topography (19.2 to 26.1°), and intense precipitation (465 to 937 mm) are more vulnerable to naturally-triggered landslides. The spatiotemporal analysis of the fatal landslides revealed increasing trends in zones such as Yan’an and Yulin cities (in northern part), and in An’kang city (in southern part). When combined with other information, the Fatal Landslide Database of Shaanxi Province can be used to provide a guide for risk assessment and spatial planning studies to mitigate geo-hazard risks.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106389"},"PeriodicalIF":2.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Silician zoning of magnetite in a Fe skarn deposit: A potential low-temperature indicator in magmatic-hydrothermal systems?","authors":"Wanyi Feng,&nbsp;Jiahao Zheng","doi":"10.1016/j.jseaes.2024.106402","DOIUrl":"10.1016/j.jseaes.2024.106402","url":null,"abstract":"<div><div>Single magnetite crystals from the Cihai Fe skarn deposit in Northwestern China are strongly growth zoned. Magnetite cores are in equilibrium with garnet whereas magnetite rims are enclosed by calcite. The chemical zoning in magnetite is well defined by an abrupt core-to-rim Si and Ca increase as well as Ti decrease. Electron microprobe analysis (EMPA) results show that magnetites rims contain from 2.24 to 5.70 wt% SiO₂ (averaging 4.56 wt%), which are silician magnetite. Plots of EMPA data suggest that silician magnetite in the Cihai skarn deposit presents in the form of [Si⁴⁺]^IV + [Fe²⁺]^VI ↔ [Fe³⁺]^IV + [Fe³⁺]^VI. The LA-ICP-MS dating results show that the garnet coexisting with the magnetite core has a U-Pb age of 282.5 ± 2.6 Ma, which is consistent with the timing of Fe mineralization in the retrograde skarn stage, indicating that silician magnetite was formed within a relatively short time interval after magnetite precipitation. Based on coexisting minerals, chemical compositions, and our previous fluid inclusion analyses, we propose that the Si zoning of magnetite is largely temperature dependent and, thus, is interpreted as a retrograde growth zoning. It is suggested that silician magnetite formed as a result of changing compatibility due to decreasing temperatures and can potentially be used to trace ore-forming temperatures in hydrothermal deposits. Our study provides independent constraints on the conditions of hydrothermal magnetite formation in the Cihai Fe skarn deposit, and suggests that silician magnetite may serve as a potential relatively low-temperature (&lt;300 °C) indicator in other less-well-constrained magmatic-hydrothermal systems.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106402"},"PeriodicalIF":2.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Middle-Late Permian Yakshawa and Late Cretaceous Daresard bauxite deposits, western Iran: Elemental deportment, parental affinities and genesis of REY minerals","authors":"Farhad Ahmadnejad ,&nbsp;Giovanni Mongelli ,&nbsp;Havzhin Parkalian ,&nbsp;Hadis Haghighi ,&nbsp;Mohammad Sharifi","doi":"10.1016/j.jseaes.2024.106397","DOIUrl":"10.1016/j.jseaes.2024.106397","url":null,"abstract":"<div><div>The Middle-Late Permian Yakshawa bauxite deposit in the Sanandaj-Sirjan Zone and the Late Cretaceous Daresard bauxite deposit in the Zagros Fold-Thrust Belt have bauxite ores with different textures and mineralogical compositions. The presence of detrital and authigenic REY-phosphates, fluorocarbonates of the bastnasite group, and cerianite with diverse generations reflect an intricate formation process of the REY-bearing minerals in these two deposits. This clearly shows that the studied deposits have a multi-stage evolution including diagenetic and/or low-grade metamorphic, in situ fluid-assisted dissolution–reprecipitation reactions, and later bauxitization. The high abundance of monazite, textural relationships, and its LREE pattern indicate this mineral is the main LREE reservoir in the studied bauxite ores whereas xenotime, both authigenic and detrital, is the main host for HREE. The R-mode factor analyses indicates that the bauxitization process induces, at large, similar interelemental relationships in the studied deposits involving the attitude of Al oxyhydroxides, Ti oxides, and Fe oxyhydroxides to concentrate critical metals and the capability of REY-phosphate of being the main reservoir of REE + Y. As for provenance, the Eu/Eu*, Sm/Nd, and Nb/Ta proxies suggest that the bauxite ores of the Yakshawa deposit have a genetic relationship with Middle-Late Permian mafic volcanic rocks, whereas the ores of the Daresard deposit show parental affinity with the underlying fine-grained clayey limestone of the Sarvak Formation.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106397"},"PeriodicalIF":2.7,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrogenesis of U-rich two-mica granite from the Mesozoic Reshui pluton (Nanling Range, South China) with implications for uranium mineralization","authors":"Jihua Tao ,&nbsp;Yuegui Yang ,&nbsp;Xianyuan Su ,&nbsp;Chengbiao Leng ,&nbsp;Kaixuan Li ,&nbsp;Xilian Chen ,&nbsp;Zhitian Xu","doi":"10.1016/j.jseaes.2024.106400","DOIUrl":"10.1016/j.jseaes.2024.106400","url":null,"abstract":"<div><div>Muscovite-bearing granites are the dominant rock type associated with metallic deposits in South China. Some of these granites are rich in U and considered potential sources for subsequent hydrothermal uranium mineralization. Although widely studied, the petrogenesis of muscovite-bearing granites remains obscure. The Reshui pluton contains fine-grained biotite granite and coarse grained two-mica granite (CGTG). CGTG exhibits high U concentrations (5.07–40.15 ppm, average 15.94 ppm) and is typical of U-rich granite in South China. We conducted detailed petrographic, geochemical and biotite mineralogical analyses of the CGTG from the Reshui pluton. Our findings provide new insights into the petrogenesis of U-rich granites in South China and their significance for uranium mineralization. LA-ICP-MS zircon U–Pb dating shows that the CGTG were formed at 167.3 ± 1.7 Ma. Integrated petrological, whole-rock geochemical and biotite geochemical data, the negative and limited variation of the ε_Nd(t) values (from − 10.8 to − 9.6) and a two-stage Paleoproterozoic model age (1.72 to 1.83 Ga), suggest the U-rich S-type CGTG formed by partial melting of Paleoproterozoic clay-rich pelitic rocks and underwent extensive fractional crystallization. The U-rich pelitic magma sources characterized by relatively low oxygen fugacity and temperature, relatively high degree of magmatic differentiation and F content are the main factors controlling U enrichment in the Reshui pluton CGTG. The petrologic and whole-rock geochemical characteristics, together with the biotite chemical compositions and disseminated U-rich accessory minerals including uraninite, indicate that the CGTG in the Reshui pluton has a high uranium mineralization potential and should be given more attention in further explorations.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"277 ","pages":"Article 106400"},"PeriodicalIF":2.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}