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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
Cong, Feng1; He, De-Feng2; Ji, Wei-Qiang3; Huang, Liang4; Xiong, Bo4; Zhang, Shao-Hua3; Huang, Xiao-Ming1
2022-03-01
Source PublicationGEOLOGICAL MAGAZINE
ISSN0016-7568
Volume159Issue:3Pages:337-356
AbstractThe 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.
KeywordCaojian rhyolites granites A-type crystal mush lithospheric delamination
DOI10.1017/S0016756821000959
Funding OrganizationNational 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
WOS KeywordSOUTHERN LANCANGJIANG ZONE ; FELSIC IGNEOUS ROCKS ; U-PB GEOCHRONOLOGY ; T-T PATH ; WESTERN YUNNAN ; SOUTHWEST CHINA ; RETROGRADED ECLOGITES ; TECTONIC IMPLICATIONS ; ISOTOPIC COMPOSITION ; LINCANG GRANITES
Language英语
Funding ProjectNational Nature Science Foundation of China[41888101] ; National Nature Science Foundation of China[92055314]
Funding OrganizationNational 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
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000753577200006
PublisherCAMBRIDGE UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104916
Collection岩石圈演化国家重点实验室
Corresponding AuthorCong, Feng
Affiliation1.Chengdu Ctr China Geol Survey, Chengdu, Peoples R China
2.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
4.Yunnan Inst Geol Survey, Kunming, Yunnan, Peoples R China
Recommended Citation
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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