0 INTRODUCTION The Haidewula uranium deposit is located in the Haidewula volcanic basin,which hosts a suite of basic,intermediate to felsic volcanic and subvolcanic rocks,including basalt,trachyte,trachyandesite.Previ...0 INTRODUCTION The Haidewula uranium deposit is located in the Haidewula volcanic basin,which hosts a suite of basic,intermediate to felsic volcanic and subvolcanic rocks,including basalt,trachyte,trachyandesite.Previous geochronological studies of the intrusions within this volcanic basin suggest that they primarily formed during the Silurian and Triassic periods(Dai et al.,2025;Sun et al.,2024;Wang et al.,2024;Zhu et al.,2022;Lei et al.,2021).展开更多
The metallogenesis of subvolcanic deposits is controlled by subvolcanic activities. The copper polymetallic deposits are genetically related to intermediate-acid rocks, and the silver polymetallic deposits are more cl...The metallogenesis of subvolcanic deposits is controlled by subvolcanic activities. The copper polymetallic deposits are genetically related to intermediate-acid rocks, and the silver polymetallic deposits are more closely related to acid rocks. The abundance of Cu is relatively high in the intermediate-acid rocks and subvolcanic rocks, whereas the abundances of Pb, An and Ag are high in acid rocks, indicating rich ore-forming elements in original magmas. The study of REEs shows that the magmatic type related to copper deposits is the syntectic type, and that related to silver polymetallic deposits is mainly the re-melting type. The deposits were formed under medium-low temperatures and low salinity. The metallogenic times were the late stage of the early Yanshanian or the late Yanshanian, dating 78–147 Ma.展开更多
Mesozoic volcanic rocks are widely distributed in southeastern China. There exist various kinds of subvolcanic granitoids associated with the volcanic rocks. This paper deals with the geological setting, the character...Mesozoic volcanic rocks are widely distributed in southeastern China. There exist various kinds of subvolcanic granitoids associated with the volcanic rocks. This paper deals with the geological setting, the characteristics and the metallogenesis of these subvolcanic granitoids.展开更多
The Bathani volcano-sedimentary sequence(BVSs)is a typical example of volcanic-plutonic complex from the Proterozoic Chotanagpur Granite Gneiss Complex.We conducted petrological and geochemical studies on two domains ...The Bathani volcano-sedimentary sequence(BVSs)is a typical example of volcanic-plutonic complex from the Proterozoic Chotanagpur Granite Gneiss Complex.We conducted petrological and geochemical studies on two domains of the BVSs;one is a granite pluton,while the other is a subvolcanic rhyolite dome.These two domains were intruded by mafic magmas during their evolution leading to magma mixing.The mafic rocks show tholeiitic trend,while calcalkaline affinities are displayed by the felsic rocks.The rocks display enriched LILE and fractionated REE patterns with enrichments in LREE relative to HREE.展开更多
基金financially supported by projects from the National Natural Science Foundation of China(No.42321001)the Qinghai Provincial Department of Science and Technology Key R&D Project(No.2025-SF-141)+1 种基金the Qinghai“Kunlun Talent”Program(Qing RC Talent Zi(2024)No.1)the Academician Zhao Pengda Innovation Center in Qinghai Geological Bureau of Nuclear Industry。
文摘0 INTRODUCTION The Haidewula uranium deposit is located in the Haidewula volcanic basin,which hosts a suite of basic,intermediate to felsic volcanic and subvolcanic rocks,including basalt,trachyte,trachyandesite.Previous geochronological studies of the intrusions within this volcanic basin suggest that they primarily formed during the Silurian and Triassic periods(Dai et al.,2025;Sun et al.,2024;Wang et al.,2024;Zhu et al.,2022;Lei et al.,2021).
文摘The metallogenesis of subvolcanic deposits is controlled by subvolcanic activities. The copper polymetallic deposits are genetically related to intermediate-acid rocks, and the silver polymetallic deposits are more closely related to acid rocks. The abundance of Cu is relatively high in the intermediate-acid rocks and subvolcanic rocks, whereas the abundances of Pb, An and Ag are high in acid rocks, indicating rich ore-forming elements in original magmas. The study of REEs shows that the magmatic type related to copper deposits is the syntectic type, and that related to silver polymetallic deposits is mainly the re-melting type. The deposits were formed under medium-low temperatures and low salinity. The metallogenic times were the late stage of the early Yanshanian or the late Yanshanian, dating 78–147 Ma.
文摘Mesozoic volcanic rocks are widely distributed in southeastern China. There exist various kinds of subvolcanic granitoids associated with the volcanic rocks. This paper deals with the geological setting, the characteristics and the metallogenesis of these subvolcanic granitoids.
基金a CSIR grant vide Project no.24(0317)/12/EMR-II.Bibhuti Gogoi acknowledges a CSIR JRF/SRF fellowship no.09/045(1146)/2011-EMR1.
文摘The Bathani volcano-sedimentary sequence(BVSs)is a typical example of volcanic-plutonic complex from the Proterozoic Chotanagpur Granite Gneiss Complex.We conducted petrological and geochemical studies on two domains of the BVSs;one is a granite pluton,while the other is a subvolcanic rhyolite dome.These two domains were intruded by mafic magmas during their evolution leading to magma mixing.The mafic rocks show tholeiitic trend,while calcalkaline affinities are displayed by the felsic rocks.The rocks display enriched LILE and fractionated REE patterns with enrichments in LREE relative to HREE.
