地质学报2017，Vol.91Issue(9)：1959-1970,12.
川西里伍式铜矿床成矿物质来源:电气石元素地球化学及硼同位素制约
Boron Isotopic and Element Geochemical Constraints of Tourmaline on the Origin of the Liwu-Type Copper Deposits, Western Sichuan
摘要
Abstract
Jianglang Dome is located in the southwestern Songpan-Ganzi Orogen (SGO) in western Sichuan.A series of copper polymetallic deposits such as Liwu, Zhongzui, Sunyelin, Baixianglin, Wajingou and Heiniudong occur around the waist of the dome.All of these deposits occur as stratiform in the Mesoproterozoic strata of the Liwu Group.But their genesis is still unknown.With ore-bearing quartztourmaline from the Liwu and Heiniudong ore deposits as study objects, this paper performed boron isotopic analyses using LA-MC-ICPMS and electron microprobe methods to understand the origin of ore-forming material of the deposits.The BSE and micrographic images reveal that these tourmalines were possibly derived from a single hydrothermal source, and electronic probe results indicate these tourmalines can be grouped into magnesium tourmaline.Boron isotopic results suggest that δ11B values of tourmaline from two deposits are-15.47‰ ± 0.83‰ to-13.06‰ ±0.77‰(n=10) and-13.19‰ ±0.57‰ to-5.91‰ ± 0.67‰(n=16), respectively, both of which are consistent to that of granite, indicating that the two deposits belong to post-magmatic hydrothermal deposits.Comparison study further shows that an NE-SW trending metallogenic belt, i.e.the Songpan-Ganzi copper polymetallic metallogenic belt(SGCPMB), occurs likely within the Songpan-Ganzi orogenic belt.In summary, this study will not only be beneficial to supplement the metallogenic theory of stratiform deposits, but also significant for the copper exploration in other domes in the SGO area in future.关键词
松潘-甘孜造山带/里伍群/电气石/硼同位素/松潘-甘孜铜多金属成矿带Key words
Songpan-Ganzi Orogen/Liwu Group/tourmaline/boron isotope/Songpan-Ganzi copper polymetallic metallogenic belt引用本文复制引用
朱斯豹,周清,袁华云,张惠华,李同柱,唐高林,梁鲸,严利伟,王昌南..川西里伍式铜矿床成矿物质来源:电气石元素地球化学及硼同位素制约[J].地质学报,2017,91(9):1959-1970,12.基金项目
本文为国家自然科学基金青年基金项目(编号41202067,41202048)及中国地质调查局项目(编号121201010000150016-05,1212011085139,1212011085162)资助成果. （编号41202067,41202048）
