U-Pb geochronology of zircon and geochemistry of Kuiqi miarolitic granites, Fujian Province

被引:0
|
作者
Shan Qiang [1 ]
Zeng QiaoSong [1 ]
Li JianKang [2 ]
Lu HuanZhang [3 ]
Hou MaoZhou [1 ,4 ]
Yu XueYuan [1 ]
Wu ChuanJun [1 ,4 ]
机构
[1] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
[2] Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Being 100037, Peoples R China
[3] Univ Quebec Chicoutimi, Chicoutimi, PQ G7H 2B1, Canada
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词
Kuiqi miarolitic granites; A-type granite; Zircon U-Pb age; Lu-Hf isotope; Underplating; A-TYPE GRANITES; DISCRIMINATION; ORIGIN; PETROGENESIS; GENERATION; CONNECTION;
D O I
暂无
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Geochemical analysis shows the Kuiqi miarolite is characterized by high Si, alkali and lower Ca contents, and riched in LILE and HFSE, hence classified as typical A-type granite. LA-ICP-MS zircon U-Pb dating analysis shows that zircon U-Pb ages of two small miarolitic cavity granites are 101.7 +/- 2Ma and 97.3 +/- 0.77Ma respectively. Zircon U-Pb ages for two large miarolitic cavity granites are 93.6 +/- 1.5Ma and 92.0 +/- 1.3Ma respectively, representing diagenetic ages of the Kuiqi miarolite and suggesting they are the products of magmatic action of the early Late Cretaceous. Analysis of in situ zircon Lu-Hf isotope show, ens(t) is +1.45 and +1.21, the mean value of two-staged model ages for zircon are 1064Ma and 1078Ma respectively, illustrating that they are made by magma derived from mantle underplating resulted in the melting of the lower crust. All these studies show the Kuiqi A-type granites are resulted in subduction between the Kula and Eurasian plates, which induced an extensional environment of above lithospheric plates. The original magmas are products of partial melting of the Neoproterzoic lower crust, with mixture of mantle.
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页码:1155 / 1167
页数:13
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