摘要
桂东北富川位于南岭成矿带西段,中生代成岩成矿作用广泛存在。利用LA-ICP-MS法对桂东北富川鲁洞辉绿玢岩进行了锆石U-Pb同位素定年,获得了其LA-ICP-MS锆石U-Pb年龄为207.8±1.5 Ma,代表了辉绿玢岩的形成年龄,结合前人对华南中生代成岩成矿作用的研究,认为鲁洞辉绿玢岩与印支期花岗岩及与之相关矿床为晚三叠世同一期岩浆作用的产物;华南晚三叠世处于大陆裂解或造山后伸展的构造环境;锆石Hf同位素特征显示鲁洞辉绿玢岩原岩可能为新生地壳/幔源物质与古老地壳物质的混合,以新生地壳/幔源物质为主;华南不仅存在燕山期成矿作用,而且印支期成岩成矿作用在华南同样存在。
Fuchuan is located in the western of Nanling metallogenic belt. The Mesozoic granites are extensively exposed in this area, with the age ranging from Caledonian to Yanshannian. This study reported the LA-ICP-MS zircon U-Pb age of the sillite from Ludong in Fuchuan, northeastern Guangxi.The zircon ages are mainly defined in 207.8±1.5 Ma, implying the formation age of the sillite. Combined with the previous studies about Indosinian granites and the related ore deposits, it is suggested that the formation age of the Ludong sillite is almost simultaneously with the Indosinian granites and the related ore deposits. Thus they should be the same magmatic products of the late Triassic. The discovery of the sillite with the age of ~208 Ma reveals that the eastern South of China was involved in a post-collision extension or continental rift setting during the late Triassic. The Hf isotopic characteristics of the sillite suggest that it should be sourced from both the old crust and new crust/mantle materials, with mainly new crust/mantle material. In South China, not only the Yanshanian deposits, but also the Indonsinian deposits are exposed.
作者
时毓
三元合
郭智超
刘希军
王新宇
吴祥珂
冯佐海
杨金磊
张晓晨
SHI Yu;SAN Yuan-he;GUO Zhi-chao;LIU Xi-jun;WANG Xin-yu;WU Xiang-ke;FENG Zuo-hai;YANG Jin-lei;ZHANG Xiao-chen(Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration and Development of Materials, Guilin University of Technology, Guilin 541006, China;Guangxi Collaborative Innovation Centre of Hidden Non-Ferrous Metallic Ore Deposits Exploration and Development of Materials, Guilin University of Technology, Guilin 541006, China;Guangxi Institute of Geological Survey, Nanning 530023,China)
出处
《桂林理工大学学报》
CAS
北大核心
2019年第2期291-300,共10页
Journal of Guilin University of Technology
基金
国家自然科学基金项目(41562005
41862003)
广西自然科学基金杰出青年科学基金项目(2018GXNSFFA281009)
广西自然科学基金项目(2016GXNSFAA380001)
