40Ar/39Ar geochronology and exhumation of mylonitized metamorphic complex in Changle-Nanao ductile shear zone

被引：0
|
作者：
王志洪
卢华复
机构：
[1] China
[2] Nanjing University
[3] Nanjing 210008
[4] Institute of Geology
[5] Chinese Academy of Sciences
[6] Department of Earth Sciences
[7] Beijing 100029
来源：
ScienceinChina(SeriesD:EarthSciences) | 1997年 / 06期
关键词：
Changle-Nanao ductile shear zone; 40Ar/39Ar plateau ages; closure temperature; uplift;
D O I：
暂无
中图分类号：
P597 [同位素地质学与地质年代学];
学科分类号：
070902 ;
摘要：
New 40Ar/39Ar plateau ages from rocks of Changle-Nanao ductile shear zone are 107.9 Ma(Mus), 108.2 Ma(Bi), 107. 1 Ma(Bi), 109. 2 Ma(Hb) and 117. 9 Ma(Bi) respectively, which are concordant with their isochron ages and record the formation age of the ductile shear zone. The similarity and apparent overlap of the cooling ages with respective closure temperatures of 5 minerals document initial rapid uplift during 107-118 Ma following the collision between the Min-Tai microcontinent and the Min-Zhe Mesozoic volcanic arc. The 40Ar/39Ar plateau ages, K-Ar date of K-feldspar and other geochronologic information suggest that the exhumation rate of the ductile shear zone is about 0.18-1.12 mm/a in the range of 107-70 Ma, which is mainly influenced by tectonic extension.
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页码：641 / 647
页数：7
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