Characteristic, Zircon Dating and Tectonic Significance of Late Triassic Granite in the Guoganjianianshan Area, Central Qiangtang, Qinghai-Tibetan Plateau, Chinaoft-com:office:office" />
详细信息
- 责任者：Hu Peiyuan (College of Earth Science ; Jilin University ; Changchun 130061 ; China) ; Li Cai
- 刊名：Geological Bulletin of China
- 出版年：2010
- 卷期：29(12)
- 关键词：花岗岩 ; granite ; 铀—铅计时 ; U-Pb dating ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.1825-1832
- 图表：6 illus., 3 tables, 33 refs.
- 分类号：0801
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
The granite rock body located in Guoganjianianshan area, Qiangtang, Northern Tibetan Plateau mainly includes biotite adamellite and granite aplite dike and intrudes into Late Triassic Wanghuling Formation and Late Carboniferous-Early Permian Zhanjin Group-complex. LA-ICP-MS U-Pb dating were carried on the zircons of this granite rock body and the dating results showed that it was formed in Late Triassic (210.3±2.6 Ma). This age is slightly later than the metamorphic peak time of the high-pressure metamorphic belt in this area and the age of the rhyolite in lower Wanghuling Formation. Geochemistry studies indicate that this granites belong to high-potassium peraluminous calc-alkaline granites and were formed in post-collisional tectonic setting and by the magmatic activity of the decompression process after the collision and thickening of lithosphere, which means that the tectonic setting of Guoganjianianshan area was transforming from collision stage to intraplate stage and entered post-collision stage.
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