地质学报2023，Vol.97Issue(11)：3550-3568,19.DOI:10.19762/j.cnki.dizhixuebao.2023048
滇西南与花岗岩有关的锡矿床时空分布与成矿作用
Temporal and spatial distribution of granite-associated tin deposits and ore-forming process in southwest Yunnan,China
摘要
Abstract
Southwest Yunnan in China experienced geological evolution similar to the world-famous Southeast Asian tin belt,so the potential of tin mineralization has always been a research hotspot.Based on previous research,this study investigates the temporal and spatial distribution patterns and ore-forming processes of Sn deposits in southwest Yunnan.The tin deposits in southwest Yunnan are mainly distributed in the Tengchong terrane,Baoshan terrane,and Changning-Menglian orogenic belt.Literature geochronological data show that three periods of tin mineralization occurred in the Tengchong terrane,i.e.,125～120 Ma,75～68 Ma,and 52～47 Ma,respectively.Our recent geochronological data identify two periods of tin mineralization in the Baoshan terrane,including Late Cenozoic(about 32～24 Ma)and Late Cretaceous(～75 Ma),and Triassic(about 235～220 Ma)tin mineralization in the Changning-Menglian orogenic belt.We propose that the Triassic tin mineralization is related to the collision after the closure of the Paleo-Tethys Ocean,the Early Cretaceous tin mineralization is related to the collision after the closure of the Meso-Tethys Ocean,the Late Cretaceous to Paleogene tin mineralization is related to the subduction of the Neo-Tethys Ocean and the subsequent slab rollback,and the Late Cenozoic tin mineralization is related to strike-slip fault activity.Generally,the tin deposits in southwest Yunnan are closely related to the late phase of the composite granite pluton,including fine-grained biotite granite,two-mica granite,or muscovite granite,which are highly differentiated and have low magmatic oxidation states.These characteristics are also shown in the Southeast Asian tin belt.Our research shows that the tin mineralization is significantly later than the emplacement of the ore-bearing Triassic granites in the Baoshan terrane and highlights the need for increased exploration and evaluation of the Late Cretaceous and Cenozoic granites and associated Sn deposits.关键词
锡矿/高分异花岗岩/成矿规律/东南亚锡矿带/滇西南Key words
tin deposit/highly differentiated granites/ore-forming regularity/Southeast Asian tin belt/southwest Yunnan引用本文复制引用
孙祥,邓军,路雷雷,司晓博,萧珂,李强,郑明俊,孙浩宇,黄云鹏..滇西南与花岗岩有关的锡矿床时空分布与成矿作用[J].地质学报,2023,97(11):3550-3568,19.基金项目
本文为国家自然科学基金重大研发计划重点支持项目(编号92162215)和高等学校学科创新引智计划项目(编号BP0719021)联合资助的成果. （编号92162215）
