典型文献
Geochronology and geochemistry of Cretaceous-Eocene granites,Tengchong Block(SW China):Petrogenesis and implications for Mesozoic-Cenozoic tectonic evolution of Eastern Tethys
文献摘要：
The Early Cretaceous-Early Eocene granitoids in the Tengchong Block record the evolutionary history of the Mesozoic-Cenozoic tectono-magmatic evolution of Eastern Tethys.(a)The Early Cretaceous grani-toids with relatively low(87Sr/86Sr)i ratios of 0.7090-0.7169 and εNd(t)values of-9.8 to-7.8 display metaluminous,calc-alkaline dominated by Ⅰ-type granite affinity and hybrid mantle-crust geochemical signatures.They may have been derived from melting of the subducted Meso-Tethyan Bangong-Nujiang oceanic crust with terrigenous sediments in an arc-continent collisional setting.(b)The Late Cretaceous-Paleocene granitoids with relatively high(87Sr/86Sr)i ratios of 0.7109-0.7627,and εNd(t)val-ues of-12.1 to-7.9 exhibit metaluminous to peraluminous,calc-alkaline dominated by S-type granite affinity and hybrid Lower-Upper crust geochemical signatures,which may be originated from partial melting of the Meso-Proterozoic continental crust in the collision setting between the Tengchong Block and Baoshan Block.(c)The Early Eocene granitoids have metaluminous,calc-alkaline Ⅰ-type and S-type granites dual affinity,with relatively high(87Sr/86Sr)i ratios of 0.711-0.736,εNd(t)values of-9.4 to-4.7,showing crust-mantle mixing geochemical signatures.They may have been originated from par-tial melting of the late Meso-Proterozoic upper crustal components mixed with some upper mantle mate-rial during the ascent process of mantle magma caused by the subduction of the Neo-Tethyan Putao-Myitkyian oceanic crust,and collision between the Western Burma Block and the Tengchong Block.It is these multi-stage subductions and collisions that caused the spatial and temporal distribution of the granitic rocks in the Tengchong Block.
文献关键词：
中图分类号：
作者姓名：
Yongqing Chen;Guangjie Li;Luxue Qin;Yingxiang Lu;Chengxing Jiang
作者机构：
School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Yunnan Geological Survey,Kunming 650051,China
文献出处：
引用格式：
[1]Yongqing Chen;Guangjie Li;Luxue Qin;Yingxiang Lu;Chengxing Jiang-.Geochronology and geochemistry of Cretaceous-Eocene granites,Tengchong Block(SW China):Petrogenesis and implications for Mesozoic-Cenozoic tectonic evolution of Eastern Tethys)[J].地学前缘（英文版）,2022(02):214-236
A类：
grani,toids,Bangong,Putao,Myitkyian,subductions
B类：
Geochronology,geochemistry,Cretaceous,Eocene,granites,Tengchong,Block,SW,China,Petrogenesis,implications,Mesozoic,Cenozoic,tectonic,Eastern,Tethys,Early,granitoids,record,evolutionary,history,tectono,magmatic,relatively,low,87Sr,86Sr,ratios,Nd,values,display,metaluminous,calc,alkaline,dominated,by,type,affinity,hybrid,mantle,geochemical,signatures,They,may,have,been,derived,from,melting,subducted,Tethyan,Nujiang,oceanic,terrigenous,sediments,arc,collisional,setting,Late,Paleocene,high,exhibit,peraluminous,Lower,Upper,which,originated,partial,Proterozoic,continental,between,Baoshan,dual,showing,mixing,late,upper,crustal,components,mixed,some,mate,rial,during,ascent,process,caused,Neo,Burma,It,these,multi,stage,collisions,that,spatial,temporal,distribution,granitic,rocks
AB值：
0.42292
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