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Petrogenesis of Triassic Caojian A-type rhyolites and associated I-type granites in the southeastern Tibetan Plateau: rejuvenation of crystal mush

文献类型：期刊论文

作者Cong, Feng2; He, De-Feng1; Ji, Wei-Qiang4; Huang, Liang3; Xiong, Bo3; Zhang, Shao-Hua4; Huang, Xiao-Ming2
刊名GEOLOGICAL MAGAZINE
出版日期2022-03-01
卷号159期号:3页码:337-356
关键词Caojian rhyolites granites A-type crystal mush lithospheric delamination
ISSN号0016-7568
DOI10.1017/S0016756821000959
英文摘要The orogenic process and crustal growth of the Changning-Menglian Palaeo-Tethys orogenic belt in the southeastern Tibetan Plateau is not fully understood. Triassic Caojian rhyolites and granites occur extensively in this orogenic belt and represent important constraints for this issue. This study aims to examine the relationships between the Triassic Caojian rhyolites and granites and to gain a better understanding of their possible petrogenesis. The study used zircon U-Pb geochronology, trace element analyses and Sr-Nd-Hf isotope data to better understand the relationships and possible origin of the rhyolites and granites. Recent zircon U-Pb ages indicated that the Caojian rhyolites were emplaced at 227.2 Ma, whereas age estimates for Caojian granites were slightly older (233.4-236.9 Ma). The Caojian rhyolites are enriched in large-ion lithophile elements and high-field-strength elements, with elevated FeOtot/MgO and Ga/Al ratios. However, they are significantly depleted in Ba, Sr, Eu, P and Ti. These geochemical characteristics indicate that they have an A-type affinity. Furthermore, the Caojian granites comprise biotite monzogranites and granodiorites and show unfractionated composition. Mineralogically, the Caojian granites were found to contain diagnostic I-type minerals such as hornblende. Geochemical data suggest that the petrogenesis of the Triassic Caojian rhyolites is characterized by rejuvenation of crystal mush represented by the Triassic Caojian granites. The necessary thermal input was supplied by mafic magma. This magmatic evolution was likely related to lithospheric delamination and upwelling of the asthenosphere during the Mid- to Late Triassic, forming post-collisional I-type granites and A-type volcanics in the Changning-Menglian Palaeo-Tethys orogenic belt.
WOS关键词SOUTHERN LANCANGJIANG ZONE ; FELSIC IGNEOUS ROCKS ; U-PB GEOCHRONOLOGY ; T-T PATH ; WESTERN YUNNAN ; SOUTHWEST CHINA ; RETROGRADED ECLOGITES ; TECTONIC IMPLICATIONS ; ISOTOPIC COMPOSITION ; LINCANG GRANITES
资助项目National Nature Science Foundation of China[41888101] ; National Nature Science Foundation of China[92055314]
WOS研究方向Geology
语种英语
WOS记录号WOS:000753577200006
出版者CAMBRIDGE UNIV PRESS
资助机构National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/104916]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Cong, Feng
作者单位1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang, Peoples R China
2.Chengdu Ctr China Geol Survey, Chengdu, Peoples R China
3.Yunnan Inst Geol Survey, Kunming, Yunnan, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Cong, Feng,He, De-Feng,Ji, Wei-Qiang,et al. Petrogenesis of Triassic Caojian A-type rhyolites and associated I-type granites in the southeastern Tibetan Plateau: rejuvenation of crystal mush[J]. GEOLOGICAL MAGAZINE,2022,159(3):337-356.
APA Cong, Feng.,He, De-Feng.,Ji, Wei-Qiang.,Huang, Liang.,Xiong, Bo.,...&Huang, Xiao-Ming.(2022).Petrogenesis of Triassic Caojian A-type rhyolites and associated I-type granites in the southeastern Tibetan Plateau: rejuvenation of crystal mush.GEOLOGICAL MAGAZINE,159(3),337-356.
MLA Cong, Feng,et al."Petrogenesis of Triassic Caojian A-type rhyolites and associated I-type granites in the southeastern Tibetan Plateau: rejuvenation of crystal mush".GEOLOGICAL MAGAZINE 159.3(2022):337-356.

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来源：地质与地球物理研究所

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