LA-ICPMS U-Pb Ages of Zircon from Metaleucosomes, Olongbuluke Microcontinent , North Qaidam, and Implications on the Response to the Global Rodinia Supercontinent Assembly Event in NW China
- Received Date: 2017-03-02
- Accepted Date: 2017-03-02
- Available Online: 2017-03-02
Abstract: U-Pb dating was conducted on different domains of zircons from metamorphosed leu- cosomes in Delingha(德令哈) complex, the lower basement rocks of the Olongbuluke (欧龙布鲁克) microcontinent, North Qaidam, in order toreview its complex tectonothermal history. The zircon core is comprised of highly-modified magmatic zircon relicts, the zircon mantle was produced in response to anatexis of a Late Protoproterozoic thermal event;age and isotopic composition of both the zircon core and the zircon mantle have been seriously disturbed due to the thermal event related with growth of the zircon overgrowth rim. The 207 Pb/ 206 Pb apparent age of the overgrowth rim was estimated to be ～ 1 030 Ma. This Late Mesoproterozoic thermal event hasbeen interpreted as aresponse to the global Rodinia supercontinent assembly event in the Olongbuluke microcontinent, Northwest China.