The Dahongliutan medium-sized lithium deposit in Xinjiang is one of the largest rare-metal pegmatite deposits in the West Kunlun orogenic belt, mainly composed of biotite monzonitic granite, biotite soda granitic granite and two mica granite with a mass of widely developed dark microgranular enclaves. LA-ICP-MS zircon U-Pb dating shows that the embedding ages of biotite monzonitic granite and biotite soda granite are（213±2.1） Ma（MSWD=1.3） and（214±1.8） Ma（MSWD = 0.56）, respectively, the two ages are identical, indicating that the Dahongliutan pluton was formed in the Late Triassic. The Dahongliutan pluton has higher value of δ7Li（0.76‰～8.75‰） and lower content of lithium（5.04～52.22）ppm, which is close to the δ7Li value（mean value of 3.13‰） of the ore-bearing pegmatite, and the whole has a small range of variation, proving that there may be a genetic relationship between the Dahongliutan rare metal pegmatite and the rock mass. The initial ratio of(87Sr/86Sr)i is 0.7087～0.71574, and εNd（t） is-8.71～0.02, two-stage mode age ranged between 990 and 1700 Ma. The majority zircon εNd（t） value ranged from 0.12 and 4.3, except a small number of < 0, and the two-stage mode age ranged between 974 and 1307 Ma. The comprehensive research shows that the Dahongliutan pluton has derived from magma mixing between Mesoproterozoic crust and mantle.
类型: 国际会议
作者: DING Kun,LIANG Ting,YANG Xiuqing,ZHANG Ze,WANG Yiqian,DING Liang
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学
专业: 地质学,地质学,地质学
单位: College of Earth Sciences and Resources, Chang’an UniversityMineralization and Dynamics Laboratory of Chang’an University
分类号: P597.3;P588.121
DOI: 10.26914/c.cnkihy.2019.028378
页码: 178
总页数: 1
文件大小: 189k
下载量: 2
本文来源: https://www.lunwen66.cn/article/85c193ed9d946d114bfebdd9.html