Rb—Sr Isotope Age of the Shangdaheyan Intrusion in the Bogda Shan Region and Its Geological Implications |
| |
摘 要: |
|
关 键 词: | 花岗岩 侵入岩 同位素年龄 造山带 铷同位素 锶同位素 |
Rb-Sr isotope age of the Shangdaheyan intrusion in the Bogda Shan region and its geological implications |
| |
Authors: | Chunshui Yu Lianxing Gu Hongyu Li Xinjian Xiao Zhenfu Yan |
| |
Institution: | 1. State Key Laboratory of Mineral Deposit Research, Nanjing University, 210093, Nanjing, China
|
| |
Abstract: | The Bogda Shan orogenic belt is interpreted to be an Upper Palaeozoic continental rift, which was closed towards the end of the Carboniferous period. Intrusive activities in that belt are represented mainly by a large number of diabasic sills, dykes and stocks with sparse dioritic and granitic bodies. Determinations on a group of samples from the Shangdaheyan intrusion yielded a mineral-rock Rb-Sr isochron with an age of 298.4±0.76 Ma and an initial87Sr/86Sr ratio of 0.7041. In combination with field evidence, these results indicate that most of the intusions of the Bogda Shan orogenic belt were emplaced during the Hercynian cycle as a result of initial extension following rift closure, and that post-Hercynian intrusive activities are not important in that belt. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |