地质科学2024，Vol.59Issue(2)：466-483,18.DOI:10.12017/dzkx.2024.032
新疆乌拉斯台河沉积物碎屑锆石U-Pb和Hf同位素研究及其地质意义
U-Pb and Hf isotopes of the detrital zircon in sediments from Wulasitai River in Xinjiang and its geological significance
摘要
Abstract
U-Pb dating and Hf isotope composition analysis of detrital zircons from Wulasitai River were conducted by LA-MC-ICP.The results show that the U-Pb ages can be divided into 470～390 Ma,380～320 Ma and 310～260 Ma.By comparing and analyzing the published U-Pb ages in the river sands from the South Tianshan and combining with other evidence,the Paleozoic geological evolution process of the southern central Tianshan was discussed.The zircon population from 470 Ma to 390 Ma examined in this research and the zircon population from 460 Ma to 380 Ma found in rivers located in the southern region of the South Tianshan likely suggest a bidirectional subduction of the South Tianshan Ocean.Zircon grains dating from 380 Ma to 320 Ma probably record the subduction of the South Tianshan Ocean towards the north.Detrital zircons from 310 Ma to 260 Ma probably record the closure of the South Tianshan Ocean during the Late Carboniferous and subsequent syn-and post-collisional magmatism.The results of Hf isotopic composition show that abundant juvenile mantle material was gradually added to the magma formation in the Baluntai region,which may be related to the northward subduction and closure of the South Tianshan Ocean.关键词
碎屑锆石/U-Pb年龄/Hf同位素/地质意义/巴伦台地区Key words
Detrital zircon/U-Pb age/Hf isotope/Geological significance/Baluntai region分类
天文与地球科学引用本文复制引用
刘桂萍,程远锋,郭瑞清,魏震,孙敏佳,宫相宽..新疆乌拉斯台河沉积物碎屑锆石U-Pb和Hf同位素研究及其地质意义[J].地质科学,2024,59(2):466-483,18.基金项目
新疆维吾尔自治区自然科学基金项目(编号:2022D01C422)和新疆维吾尔自治区"天池英才"引进计划项目(编号:51052300409)资助 （编号:2022D01C422）
