摘要
锡作为战略资源对社会经济发展具有关键作用。近年来,错那洞地区锡矿勘探突破对于喜马拉雅成矿带资源潜力评价意义重大。区内出露的穹窿构造及淡色花岗岩与锡多金属矿化存在密切成因联系,但深部物质结构对锡成矿的控制规律尚未明晰。本文基于大地电磁数据构建了深度达45 km的三维电性结构,结合三维密度结构与地球化学证据开展综合解析,结果发现喜马拉雅带东段发育两类高导异常:穹窿北侧异常可能关联南北向伸展体系,沿错那裂谷分布的南侧异常(延伸至30 km深度)则与东西向伸展作用相关。东西向伸展诱发中地壳部分熔融,不同的地幔热源导致熔融温度与程度差异,进而影响锡元素富集。本研究揭示了喜马拉雅东段锡多金属成矿系统的深部架构,为区域成矿机制研究提供新依据。
Tin,a critical strategic mineral,plays a vital role in socioeconomic development.Recent exploration breakthroughs in theCuonadong tin deposit have significantly advanced the assessment of resource potential in the Himalayan belt.Genetic connectionsexist between exposed domal structures,leucogranites,and Sn-polymetallic mineralization,yet deep structural controls on tinenrichment remain poorly constrained.This study integrates magnetotelluric data to establish a 3-D resistivity architecture extendingto a depth of 45 km,synergized with 3-D density models and geochemical evidence.The results reveal two types of high-conductivity anomalies in the eastern Himalayan belt:a dome-adjacent northern anomaly linked to N-S extensional systems,and asouthern anomaly along the Cona Rift(extended to a depth of 30 km)associated with E-W extension.E-W extension facilitates mid-crustal partial melting,where heterogeneous mantle-derived heat sources induce variations in melt temperature and differences inmelting degree,consequently influencing tin enrichment.This study unravels the deep architecture of the tin-polymetallicmetallogenic system in the eastern Himalayas,establishing critical constraints for regional metallogenic models.
作者
焦彦杰
张林奎
李光明
张志
梁生贤
付建刚
李德伟
黄勇
JIAO Yanjie;ZHANG Linkui;LI Guangming;ZHANG Zhi;LIANG Shengxian;FU Jiangang;LI Dewei;HUANG Yong(Chengdu Center,China Geological Survey(Geosciences Innovation Center of Southwest China),Chengdu 610218,China)
出处
《沉积与特提斯地质》
北大核心
2025年第4期724-736,共13页
Sedimentary Geology and Tethyan Geology
基金
深地国家科技重大专项(2025ZD1006300)
国家重点研发计划项目(2023YFC2906805,2021YFC2901903)
国家自然科学基金项目(4224100033)
中国地质调查局地质调查项目(DD20240069)。
关键词
喜马拉雅带
穹窿
锡成矿
高导异常
东西向伸展
Himalayan belt
dome
tin mineralization
high-conductivity anomaly
east-west extension
