LA-ICP-MS Zircon U-Pb Age of Meta-Basic Plutons in Eastern Quanji Massif: Evidence for Mesoproterozoic Continental Break-Up
详细信息
- 责任者：Liao Fanxi (Faculty of Earth Sciences ; China University of Geosciences ; Wuhan 430074 ; China) ; Gong Songlin
- 刊名：Geological Bulletin of China
- 出版年：2012
- 卷期：31(8)
- 关键词：变火成岩 ; metaigneous rocks ; 铀—铅计时 ; U-Pb dating ; 柴达木盆地 ; Qaidam Basin
- 页码：p.1279-1286
- 图表：3 illus., 2 tables, 35 refs.
- 分类号：0802
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
The meta-basic plutons are extensively developed within the Paleoproterozoic monzogranitic gneiss in the eastern most Quanji massif. In this paper, the zircon U-Pb age of one of the meta-basic plutons was determined with LA-ICP-MS. Ten analytical data show strong lead loss due to thermal events, but their discordant line remains well correlated with the upper intercept age of (1712±47) Ma and lower intercept age of (472±29) Ma, MSWD=1.4. The dating result indicates that the protolith of this pluton was formed in the early Mesoproterozoic, being the product of the initial break-up process after the assembly of the Quanji massif with the supercontinent Columbia in the Late Paleoproterozoic.