3.3～3.1 Ga Magmatism Recorded in an Outcrop of the Dongshan Complex in the Anshan Area, North China Craton: Evidence from Geochemistry and SHRIMP Zircon Dating
详细信息
- 责任者：Dong Chunyan (Beijing SHRIMP Center ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Wan Yusheng
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(2)
- 关键词：杂岩 ; complexes ; 岩浆作用 ; igneous processes ; 辽宁 ; Liaoning Province
- 页码：p.414-420
- 图表：illus., 2 tables, 20 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
This paper reports 3.33～3.14Ga magmatism recorded in an outcrop of the Dongshan Complex in Anshan. 3.33Ga gabbro is cut by 3.28Ga and 3.14Ga trondhjemites, with all showing metamorphism and deformation to different degrees. Meta-gabbro is high in FeOT and low in MgO, characterized by high ΣREE contents and weak light/heavy REE differentiation. Trondhjemites are high in Na2O and low in K2O, showing strong light/heavy REE differentiation. The well-developed Paleoarchean to Mesoarchean magmatism probably suggests a long-term high-temperature process relating to mantle activity.
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