摘要
青海南山首次发现的兴凯期变质侵入岩(体),侵入于古元古代化隆岩群中,铀—铅同位素年龄值为(742±34)Ma(MSWD=8.2),时代为新元古代。岩浆成因属地壳物质重熔型,是同碰撞构造环境下形成的。该变质侵入岩的发现,代表了该区有兴凯期构造热事件的产物。对于南祁连华南纪基底的深入研究及进一步恢复和确定拉鸡山造山带发展演化史具有重要意义。
Metamorphic intrusive rocks of Xingkai period was discovered for the first time in Nanshan area of Qinghai province when the invasion happened in Paleoproterozoic Longhua rock group. The uranium-lead isotopic age is（ 742 ± 34） Ma（ MSWD = 8. 2）,and the age is Neoproterozoic era. Magma genesis belongs to crust material remelting type,which is formed under the same collision tectonic environment. The discovery of this metamorphic intrusive rock represents the area product of Xingkai tectonic thermal events in the area. It is of great significance for the further study of the basement of southern Qilian mountain in Southern China,including the further development and evolution history of Lajishan orogenic belt.
出处
《中国锰业》
2017年第2期14-17,共4页
China Manganese Industry
基金
中国地质调查局项目(12120113033020)
关键词
青海南山地区
兴凯期
变质侵入体
U-Pb同位素测年
Nanshan area of Qinghai province
Xingkai period
Metamorphic intrusive body
U-Pb isotope dating
