Middle Paleoproterozoic Crustal Extensional Regime in the North China Craton: New Evidence from SHRIMP Zircon U-Pb Dating and Whole-Rock Geochemistry of Meta-Gabbro in the Anshan-Gongchangling Area
详细信息
- 责任者：Dong Chunyan (Beijing Center ; Institute of Geology ; Chinese Academy of Geological Sciences ; SHRIMP ; Beijing 100037 ; China) ; Ma Mingzhu
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(9)
- 关键词：变火成岩 ; metaigneous rocks ; 铀—铅计时 ; U-Pb dating
- 页码：p.2785-2792
- 图表：3 illus., 2 tables, 33 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
This paper reports whole-rock geochemistry and zircon geochronology of Middle Paleoproterozoic meta-gabbro from the Anshan-Gongchangling area, eastern North China Craton. Based on geochemical compositions, the meta-gabbro can be divided into two types. Type 1 is high in FeOT and low in MgO, with TREE contents and (La/Yb)N values of 107.5×10-6~114.0×1.ype 1 meta-gabbro is formed by strong recrystallization-differentiation of mafic magma staying a long period at a deep magmatic chamber, supporting a conclusion that the North China Craton was in an extensional regime during the Middle Paleoproterozoic period.