老挝-越南长山成矿带古特提斯构造岩浆演化与成矿作用  

Paleo-Tethys tectonic-magmatic evolution and mineralization in the Truong Son metallogenic belt, Laos-Vietnam

作　　者：王天瑞 侯林[1] 林方成[1] 熊富浩[2] 郭阳[1] 郭林楠 徐思维 曾祥婷 施美凤[1] 丛峰[1] WANG Tianruil;HOU Lin;LIN Fangcheng;XIONG Fuhao;GUO Yang;GUO Linnan;XU Siwei;ZENG Xiangting;SHI Meifeng;CONG Feng(Chengdu Center,China Geological Survey,Chengdu 610081,China;College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610081 [2]成都理工大学地球科学学院,四川成都610059

出　　处：《沉积与特提斯地质》2022年第2期212-227,共16页Sedimentary Geology and Tethyan Geology

基　　金：国家自然科学重点基金课题“东南亚长山带锡多金属成矿作用研究”(92162215-1);中国地质调查局二级项目“柬埔寨-老挝-越南铝土矿资源调查”(DD20201160)。

摘　　要：老挝-越南长山成矿带位于特提斯构造成矿域东南段,发育大量古特提斯旋回岩浆岩和铜-金-铁-锡等多金属矿床,是研究东特提斯构造岩浆演化与成矿作用的天然实验室。本文系统梳理了长山成矿带的成岩成矿时代、矿床组合和岩石地球化学研究成果,揭示了长山成矿带古特提斯时期的岩浆岩时空格架,构建了晚石炭—中二叠世(317~264 Ma)哀牢山-马江洋的俯冲、中二叠—晚三叠世(263~235 Ma)华南地体与印支地体的碰撞以及晚三叠世(234~202 Ma)碰撞后伸展等构造演化过程。初步建立了长山成矿带各阶段的成矿模式,包括俯冲期斑岩-矽卡岩型Fe-Cu-Au和浅成低温热液型Cu-Au-Ag成矿(305~279 Ma)、碰撞期斑岩-矽卡岩型Sn和矽卡岩型Fe-Au成矿(249~236 Ma)、伸展期热液脉型Au矿化(212~204 Ma)。受限于晚三叠世晚期岩浆活动和成矿作用研究资料的缺乏,碰撞后伸展阶段的成矿作用仍有待进一步研究。The Truong Son metallogenic belt which spans Laos and Vietnam is located in the southeast part of the Tethys tectonic-metallogenic domain.It develops a large number of Paleo-Tethys igneous rocks and Cu-Au-Fe-Sn polymetallic deposits,which makes the Truong Son belt a natural laboratory for studying the tectonic-magmatic evolution and mineralization of the Eastern Tethys.This paper systematically combs the research findings of diagenetic and metallogenic age,deposit assemblage and whole-rock geochemistry in the Truong Son metallogenic belt,and reveals the temporal and spatial framework of igneous rocks in the Paleo-Tethys period of the Truong Son metallogenic belt,and establishes the tectonic evolution processes,including the subduction of Ailaoshan-Song Ma ocean plate in the Late Carboniferous to Middle Permian(317~264 Ma),the collision between the South China block and the Indochina block in the middle Permian to Late Triassic(263~235 Ma),and the post-collision extension process in the Late Triassic(234~202 Ma).The metallogenic model of the Truong Son belt is preliminary established,including porphyry-skarn type Fe-Cu-Au and epithermal type Cu-Au-Ag mineralization(305~279 Ma)in subduction period,porphyry-skarn type Sn and skarn type Fe-Au mineralization(249~236 Ma)in collision period and hydrothermal vein type Au mineralization(212~204 Ma)in extension period.Since there are few reports on magmatism and mineralization in the Late Triassic,the mineralization of extensional period still needs to be further studied.

关 键 词：古特提斯 长山成矿带 构造岩浆演化 成矿作用 

分 类 号：P548[天文地球—构造地质学] P618.2[天文地球—地质学]