地质通报2015，Vol.34Issue(12)：2266-2279,14.
藏北南羌塘盆地二叠纪曲地组碎屑锆石LA-ICP-MS U-Pb年龄及其地质意义
The detrital zircon LA-ICP-MS U-Pb ages of Qudi Formation in southern Qiangtang basin, northern Tibet, and their significance
摘要
Abstract
The southern Qiangtang basin is a set of tectonic accretionary geological bodies produced by Tethys subduction, and is al-so the key area for the study of early tectonic evolution in the Tibetan Plateau. In this basin, Carboniferous strata are rarely exposed. In this paper, the major compositions elements, trace elements and rare earth elements were studied by using two samples collected from the Late Paleozoic Qudi Formation. Zircon U-Pb dating through LA-ICP-MS isotope measurement shows that the ages have six peaks, i.e., 330~270Ma, 560~480Ma, 880~720Ma, 1750~1650Ma, 2400~2000Ma and 2800Ma. An analysis of geochemical charac-teristics suggests that the geotectonic background for the source region of Qudi Formation was passive continental margin and land arc, and the provenance of sediments had multi-source character, which, however, needs further research. It is inferred that the mate-rial source might have come from the northern Gondwana during Permian.关键词
南羌塘盆地/改则/晚古生代/碎屑锆石/LA-ICP-MSU-Pb年龄/物源Key words
southern Qiangtang basin/Gerze/Late Paleozoic/detrital zircon/LA-ICP-MS U-Pb age/provenance analysis分类
天文与地球科学引用本文复制引用
石晓龙,黄强太,夏斌,王志龙,夏中宇,胡西冲,郑浩,李卓飞..藏北南羌塘盆地二叠纪曲地组碎屑锆石LA-ICP-MS U-Pb年龄及其地质意义[J].地质通报,2015,34(12):2266-2279,14.基金项目
中国地质调查局项目(编号:1212011221087、1212011221088) （编号:1212011221087、1212011221088）
