基于地幔通道流理论的郯庐断裂东侧三个巨型成矿带地球物理特征与成矿背景探讨  

Discussion on the geophysical characteristics and metallogenic background of three giant metallogenic belts on the eastern side of the Tanlu fault based on the mantle flow theory

作　　者：严加永[1] 黄宗理[1] 张昆[1] 张辉 陈昌昕 王志辉[1] 高磊 王晓娟 YAN Jiayong;HUANG Zongli;ZHANG Kun;ZHANG Hui;CHEN Changxin;WANG Zhihui;GAO Lei;WANG Xiaojuan(State Key Laboratory of Deep Earth and Mineral Exploration,Chinese Academy of Geological Sciences,Beijing 100094,China)

机构地区：[1]深地探测与矿产勘查全国重点实验室,中国地质科学院,北京100094

出　　处：《地质学报》2025年第3期778-793,共16页Acta Geologica Sinica

基　　金：国家重点研发项目(编号2023YFC2906904);中央级科研院所基本科研业务费重点攻关项目(编号JKYZD202303)联合资助的成果。

摘　　要：郯庐断裂东侧平行展布着长江中下游铜铁成矿带、胶东金矿成矿带及辽东多金属成矿带,它们间距近乎相等,是中国东部重要的金属资源富集区。本文基于重力、磁法、深反射地震及大地电磁等多尺度地球物理数据,剖析了三个成矿带在地幔岩石圈、地壳和近地表的地球物理特征。结合地幔通道流理论分析,认为成矿物质来源于地幔岩石圈深部,郯庐断裂作为幔源物质上涌的主要通道,与其东侧的长江断裂、胶北断裂、辽东断裂三个次级断裂共同控制了这三个成矿带。通过模型和实际资料分析了不同地球物理方法在幔源岩浆全程追踪中的优势和不足,认为地球物理探测可以获取地幔到地表的三维图像,可实现对幔源岩浆在岩石圈空间的全程追踪,有助于提升对不同尺度成矿系统“源-运-储”关键要素的识别能力。研究结果表明地球物理多方法联合可有效追踪幔源物质运移路径,为深部找矿提供理论支撑。The three major metallogenic belts(Middle-Lower Yangtze River Valley Cu-Fe belt,Jiaodong Au belt,and Liaodong polymetallic belt)flanking the eastern side of the Tanlu fault zone exhibit near-equidistant parallel distribution and represent crucial metal enrichment zones in eastern China.Based on multi-scale geophysical datasets including gravity,magnetic,deep seismic reflection,and magnetotelluric surveys,this study systematically examines their geophysical characteristics spanning from mantle lithosphere through crust to near-surface domains.Our analysis integrating mantle channel flow theory reveals that:①Metallogenic materials originated from deep mantle lithosphere;②The Tanlu fault zone serves as the principal pathway for ascending mantle-derived materials,coordinating with secondary faults(Yangtze fault,Jiaobei fault,and Liaodong fault)to jointly control metallogenesis.Comparative evaluation of geophysical methods demonstrates complementary strengths in tracking mantle-derived magmas through crustal levels.Integrated application of gravity-magnetic-electromagnetic-seismic methods effectively traces mantle material migration pathways,while 3D geophysical imaging enables full-process monitoring from mantle sources to near-surface reservoirs,significantly enhancing identification capabilities for critical metallogenic system elements(source-transport-reservoir)across multiple scales.This integrated approach provides theoretical support for deep mineral exploration targeting.

关 键 词：地幔通道流 地球物理 成矿带 郯庐断裂 

分 类 号：P61[天文地球—矿床学]