长江中下游成矿带南陵—宣城矿集区中生代构造—岩浆—成矿特征及其地质意义  

Mesozoic tectonic—magmatic—metallogenic characteristics of the Nanling—Xuancheng ore concentration district,Middle—Lower Yangtze Metallogenic Belt,and their geological significance

作　　者：徐晓春[1] 金林森 许心悦 谢巧勤[1] 夏彩莲 XU Xiaochun;JIN Linsen;XU Xinyue;XIE Qiaoqin;XIA Cailian(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,230009,China;Department of Earth and Atmospheric Sciences,University of Alberta,Edmonton,Alberta,T6G 2E3,Canada)

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009 [2]阿尔伯塔大学地球与大气科学学院,加拿大埃德蒙顿T6G 2E3

出　　处：《地质论评》2024年第5期1639-1659,共21页Geological Review

基　　金：国家自然科学基金资助项目(编号:42030801);国家重点研发计划项目(编号:2016YFC0600209)的成果。

摘　　要：安徽南陵—宣城矿集区是长江中下游成矿带中一个新确立的矿集区,近年来找矿勘查工作取得重要进展。笔者等在广泛收集以往区域地质调查以及最新地球物理探测和矿床地质勘查成果的基础上,系统总结了矿集区地质构造、岩浆岩和铜多金属矿床的地质和地球化学特征,探讨了中生代时期区域构造作用与岩浆作用和成矿作用的相互关系。研究认为,南陵—宣城矿集区构造上为一个受深大断裂控制的中生代—新生代陆相凹陷—断陷火山—沉积盆地,盆地之上叠置古生代地层构成的NE向指状展布的复背斜/逆冲推覆体,盆地基底地层组成和构造特征与盆地之上叠置的复背斜/逆冲推覆体基本一致,且两者均发育相同时代和特征的侵入岩及相关铜多金属矿床。南陵—宣城矿集区构造—岩浆—成矿特征总体上与长江中下游成矿带其他地区基本一致,反映自中生代以来受古太平洋板块向欧亚板块之下俯冲作用的控制,经历了强烈的陆内变形改造以及相应的多期次NW—SE向挤压作用和拉张作用。南陵—宣城矿集区构造—岩浆—成矿特征同时又具有其独特性,表现在其地质构造格架、侵入岩和矿床特征与长江中下游成矿带其他火山—沉积盆地明显不同,反映其在区域构造空间以及地壳基底结构和组成上的差异,同时揭示南陵—宣城矿集区是长江中下游成矿带跨构造单元复合系统的典型代表。Nanling—Xuancheng area in Anhui province is a newly established ore concentration district in the Middle and Lower Yangtze River Metallogenic Belt(MLYRMB),and mineral exploration in this area has made important progress in recent years.Based on the results of previous regional geological surveys and the latest regional geophysical exploration and geological exploration of ore deposits,the geological and geochemical characteristics of structures,magmatic rocks and Cu—polymetallic deposits were systematically summarized,the relationship between Mesozoic region tectonism and magmatism,mineralization in the ore concentration district discussed.Research results indicate that the Nanling—Xuancheng ore concentration district is a Meso—Cenozoic continental depression—fault volcano—sedimentary basin controlled by deep faults.There are a serials of NE strike finger-like anticlinoria/thrust nappes overlapping on the basin.The stratigraphic compositions and structural characteristics of the basin-basement are basically same as those of the anticlinoria/thrust nappes,and both of them developped intrusive rocks and related Cu—polymetallic deposits with same age and characteristics.Generally the tectonic—magmatic—metallogenic characteristics of the Nanling—Xuancheng ore concentration district are consistent with other areas in the MLYRMB,indicating that since the Mesozoic era,under the control of the subduction of the Paleo-Pacific plate,the ore concentration district has experienced extreme intracontinental deformation and corresponding multi-stage NW—SE compression and extension.On the other hand,the Nanling—Xuancheng ore concentration district has its peculiarity for the characteristics of structures,intrusive rocks and Cu—polymetallic deposits of it are obviously different from those of the other volcano—sedimentary basins in MLYRMB,reflecting they have some differences in regional tectonic,crustal basement structure and composition,and rvealing that the Nanling—Xuancheng ore concentration dist

关 键 词：地质构造格架 成岩成矿特征 长江中下游成矿带 江南隆起带 南陵—宣城矿集区 

分 类 号：P618.2[天文地球—矿床学]