Zircon U-Pb LA-ICP-MS Dating of Fenghuangshan Pluton in Northern Daba Mountains and Its Implications to Tectonic Settings

详细信息   

• 责任者：Li Jianhua (Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100081 ; China) ; Zhang Yueqiao
• 刊名：Geological Review
• 出版年：2012
• 卷期：58(3)
• 关键词：侵入体 ; intrusions ; 大巴山 ; Daba Mountains
• 页码：p.581-593
• 图表：3 tables, 52 refs.
• 分类号：0801
• issnNo：ISSN0371-5736
• isbnNo：CN11-1952/P

摘要

The Fenghuangshan Pluton in the north edge of the Daba Mountains, is a Neoproterozic intrusive rock unit in the northern margin of the Yangtze Block. This paper reports the LA-ICP-MS zircon U-Pb dating of this pluton. The dating results can be divided into three phases： early phase （797±6 Ma）, middle phase （770±6 Ma, 774±5 Ma）, late phase （755±6 Ma, 750±13 Ma and 743±6 Ma）, indicating multi-phase magmatic activity in the Fenghuangshan Pluton. These magmatic activities were also widely recorded in the other Neoproterozoic complex rocks in the Yangtze Block, such as the Hannan and Huangling complex.  This research has important significance in understanding the growth and reconstruction process of continental crust of the Yangtze Block and the breakup mechanism of Rodinia supercontinent.