Isotopic characteristics of shoshonitic rocks in eastern Qinghai-Tibet Plateau: Petrogenesis and its tectonic implication

被引：0
|
作者：
张玉泉
谢应雯
李献华
邱华宁
梁华英
李建平
赵振华
邓万明
钟孙霖
机构：
来源：
Science China Earth Sciences | 2001年 / 01期
关键词：
isotopic characteristics; magmatic rocks; shoshonitic series; eastern Qinghai-Tibet Plateau;
D O I：
暂无
中图分类号：
P595 [元素地球化学];
学科分类号：
070902 ;
摘要：
The Cenozoic magmatic rocks of shoshonitic series in the eastern Qinghai-Tibet Plateau include potassic alkaline plutonic rocks, volcanic rocks, lamprophyres and acidic porphyries. Analytical results show that these different lithological rocks are extremely similar in Sr, Nd and Pb isotopic compositions with the range of 0.705 187-0.707 254 for 87Sr/86Sr, 0.512 305-0.512 630 for 143Nd/144Nd, 18.53-18.97 for 206Pb/204Pb, 15.51-15.72 for 207Pb/204Pb and 38.38-39.24 for 208Pb/204Pb. They are isotopically similar to the EMU end-member. This indicates that mantle metasomatism must have taken place in their source region. The formation of these particular rocks is related to crustal thinning and mantle upwelling in a large-scale strike-slip and pull-apart fault zone at about 40 Ma in northern and eastern Qinghai-Tibet Plateau.
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页码：1 / 6
页数：6
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