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Metamorphic evolution and Petrogenesis of garnet?corundum silica?undersaturated metapelitic granulites: A new case study from the Mianl?e Tectonic Zone of South Qinling, Central China

文献类型：期刊论文

作者Liao, Xiaoying2; Liu, Liang2; Zhai, Mingguo1,2; Liang, Sha3; Yang, Wenqiang2; Kang, Lei2; Gai, Yongsheng2; Zhang, Chengli2
刊名LITHOS
出版日期2021-07-01
卷号392页码:23
ISSN号0024-4937
关键词Garnet?corundum metapelitic granulites Trace elements in garnet Phase equilibria modelling P?T?t path Mianl?e Tectonic Zone
DOI10.1016/j.lithos.2021.106154
英文摘要Newly identified garnet & ndash;corundum silica-undersaturated pelitic granulites in the Mianl & uuml;e Tectonic Zone of the South Qinling belt, central China, preserve a distinct mineral assemblage of garnet + corundum + biotite + plagioclase +/- kyanite + sillimanite + staurolite and are therefore useful for deciphering the metamorphic evolution of the zone. Most of the garnet porphyroblasts preserve prominent major-and trace-element zoning, which provides evidence for two stages of garnet growth, under subsolidus conditions and then fluid-absent conditions, during pro grade metamorphism. The distinctive yttrium annuli in garnet grains are most likely the result of the breakdown of xenotime. Four stages in the pressure & ndash;temperature (P & ndash;T) evolution of the granulites are inferred from the results of P & ndash;T pseudosection analysis together with petrographic observations. The first stage records the early prograde evolution, comprising isobaric heating at-7 kbar from 580 to-700 degrees C, and the later-stage prograde evolution with increasing pressure and temperature to the peak-pressure stage. The second stage is marked by the maximum XGrs in the garnet mantle, indicating the peak conditions in the high-P & ndash;high-T granulite facies of 830 degrees C at-11.7 kbar. The third stage is characterized by a continued increase in pyrope in the garnet rim, suggesting decompression with slight heating from the peak pressure to reach the peak temperature at-9.4 kbar and-850 degrees C. The late retrograde cooling stage is represented by further decompression after the peak temperature, accompanied by the growth of staurolite. 7 & ndash;13 mol% melt was produced during prograde metamorphism via the reaction sill + bi + pl -> g + crn + melt. Although later melt loss reduced the bulk-rock Si and Al, the low-Si and high-Al & ndash;Fe bulk compositions of restite were inherited mainly from the protolith, which comprised high-Fe sediments (bauxites) derived from weathering of adjacent mafic rock. U & ndash;Pb dating of metamorphic zircon rims yielded two age clusters:-227 Ma represents the timing close to peak-pressure conditions, and 222 & ndash;217 Ma represents the timing of post-Tmax cooling to the solidus. Monazite U & ndash;Pb ages of 212 & ndash;206 Ma are interpreted as the timing of further retrograde cooling under the solidus. The geochronological data and clockwise P & ndash;T paths indicate the garnet & ndash;corundum pelitic granulites record a complete metamorphic P & ndash;T & ndash;t history, including crustal thickening during continental collision/subduction and subsequent exhumation and cooling during the early Mesozoic. Combined with recent high-precision early Neoproterozoic data, we proposed that the MTZ was formed as a result of Grenvillian oceanic plate subduction and the assembly of Rodinia during the early Neoproterozoic and that it also records processes related to continental collision/subduction during the early Mesozoic. (c) 2021 Published by Elsevier B.V. Superscript/Subscript Available
WOS关键词ULTRAHIGH-TEMPERATURE GRANULITES ; MINERAL EQUILIBRIA CALCULATIONS ; PRESSURE MAFIC GRANULITES ; GARNET-CORUNDUM ROCKS ; LUE SUTURE ZONE ; T-X CONSTRAINTS ; U-PB AGE ; BEARING GRANULITES ; PHASE-EQUILIBRIA ; BOHEMIAN MASSIF
资助项目National Natural Science Foundation of China[41902050] ; National Natural Science Foundation of China[42030307] ; National Natural Science Foundation of China[41572049]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000680827900001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/101917]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Liu, Liang; Zhai, Mingguo
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
3.Inst Geol & Mineral Explorat Co LTD, Xian 710100, Peoples R China
推荐引用方式
GB/T 7714		 Liao, Xiaoying,Liu, Liang,Zhai, Mingguo,et al. Metamorphic evolution and Petrogenesis of garnet?corundum silica?undersaturated metapelitic granulites: A new case study from the Mianl?e Tectonic Zone of South Qinling, Central China[J]. LITHOS,2021,392:23.
APA Liao, Xiaoying.,Liu, Liang.,Zhai, Mingguo.,Liang, Sha.,Yang, Wenqiang.,...&Zhang, Chengli.(2021).Metamorphic evolution and Petrogenesis of garnet?corundum silica?undersaturated metapelitic granulites: A new case study from the Mianl?e Tectonic Zone of South Qinling, Central China.LITHOS,392,23.
MLA Liao, Xiaoying,et al."Metamorphic evolution and Petrogenesis of garnet?corundum silica?undersaturated metapelitic granulites: A new case study from the Mianl?e Tectonic Zone of South Qinling, Central China".LITHOS 392(2021):23.

入库方式： OAI收割

来源：地质与地球物理研究所

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