The Disintegration of Kuanping Group in
详细信息
- 责任者：Diwu Chunrong (State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwestern University ; Xi’an 710069 ; China) ; Sun Yong
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(7)
- 关键词：变火山岩 ; metavolcanic rocks ; 绿片岩 ; greenschist ; 秦岭 ; Qinling Mountains
- 页码：p.2025-2038
- 图表：5 illus., 2 tables, 41 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Kuangping Group located in North Qinling orogenic belt which consists chiefly of metabasalts and meta-sedimentary.A new LA-ICPMS zircon U-Pb age of metabasalt of Kuanping Group is presented and gives a weighted mean 207Pb/206Pb age of 943 Ma which in the Neo-proterozoic time.However,the meta-sedimentary of Kuanping Group is limited to that in Early Phanerozoic time,but the Proterozoic,as previously considered.Therefore,this indicate that the two types of rock is not a continuous stratigraphic unit,protoliths of metabasalts were tholeiitic basalts with N-MORB geochemical characteristics,which represents a dismembered ophiolite and indicate a remnants of Greenville orogeny in the North Qinling orogenic belts.