SHRIMP Geochronology and Hf Isotope of Zircons from Granitoids of the Weilasituo Deposit in Inner Mongolia
详细信息
- 责任者：Wang Xinyu (School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Hou Qingye
- 刊名：Geoscience
- 出版年：2013
- 卷期：27(1)
- 关键词：花岗岩 ; granite ; SHRIMP定年 ; SHRIMP dating ; 内蒙古 ; Inner Mongolia
- 页码：p.67-78
- 图表：illus., 7 tables, 44 refs.
- 分类号：0801
- issnNo：ISSN1000-8527
- isbnNo：CN11-2035/P
摘要
Weilasituo copper polymetallic deposit is located in the intersection of central Asia orogenic belt and Da Xinganling orogenic belt.The zircon SHRIMP U-Pb dating shows that granitoids ages are(298.0±2.5) Ma,(308.3±4.2) Ma,(313.9±3.4) Ma and(320.5±4.1) Ma,indicating that they formed in Late Carboniferous.Rock geochemistry characteristics shows that the granitoids are the product of magmatic arc activities.Except for the zircons of granodiorites samples with εHf(t) values from-4.1 to+4.08,the zircon εHf(t) values of the other samples are positive,ranging from +0.4 to +9.9.The peak of zircon Hf model age is consistent with the time of Paleo-Asian Ocean development,suggesting that the main source material of granitoids in mining area is the subducted oceanic curst of the Paleo-Asian Ocean and some Precambrian crust.Systematic study on granitoids in mining area may provide the basic information for exploring the evolution of Xinganling-Mongolian orogenic belt in the Late Paleozoic and new evidence for the genesis of copper polymetallic deposit.