SHRIMP U-Pb geochronology of the detrital zircons from the Longshoushan Group and its tectonic significance

被引:91
|
作者
Tung, Kuoan [1 ]
Yang, HoungYi
Liu Dunyi
Zhang JianXin
Tseng, ChienYuan
Wan YuSheng
机构
[1] Natl Cheng Kung Univ, Dept Earth Sci, Tainan 701, Taiwan
[2] Museum Nat Sci, Taichung, Taiwan
[3] Chinese Acad Sci, Beijing SHRIMP Ctr, Inst Geol, Beijing 100037, Peoples R China
[4] Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
来源
CHINESE SCIENCE BULLETIN | 2007年 / 52卷 / 10期
基金
中国国家自然科学基金;
关键词
Longshoushan group; SHRIMP; detrital zircons; U-Pb geochronology; metasedimentary rocks;
D O I
10.1007/s11434-007-0189-x
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Sixty-two geologically meaningful U-Pb dates were obtained by using SHRIMP technique for the detrital zircons in three metasedimentary rocks from stratigraphically uppermost parts of the Longshoushan Group in the present study. Eighty percents of these dates range from 1.7 Ga to 2.2 Ga with a peak at 1.8-2.0 Ga and twenty percents from 2.3 Ga to 2.7 Ga. The youngest detrital zircon is dated at 1724 19 Ma which is interpreted as the maximum depositional age of the metasedimentary rocks. Therefore, the age for the diagenesis and lithification of the original sedimentary rocks of the Longshoushan Group before the metamorphism must be younger than 1724 19 Ma. Comparison of the age histograms of these detrital zircons with the ages of the igneous rocks on the surrounding older massifs suggests that the sediments of the Longshoushan Group were most likely derived from the Alaxa Block and Tarim Craton. This implies that the affinity between Alaxa Block and Tarim Craton was strong and that they might have been a unified craton during middle-early Proterozoic time.
引用
收藏
页码:1414 / 1425
页数:12
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