地质学报2011，Vol.85Issue(5)：712-730,19.DOI:CNKI:11-1951/P.20110511.2140.004
长江中下游成矿带火山岩盆地的成岩成矿作用
Petrogensis and Metallogeny Study of the Volcanic Basins in the Middle and Lower Yangtze Metallogenic Belt
摘要
Abstract
The Middle-Lower Yangtze River valley is one of the most important Cu-Fe polymetallic belts in China, in which hosts many volcanic basins, such as Li-Shu, Li-Yang, Ning-Wu, Fan-Chang, Lu-Zong,Huai-Ning and Jin-Niu volcanic basin. Compared with the uplift area in this region, the researches on the petrogenetic and metallogenetic in the volcanic basin are still poorly investigated. Basing on the contributions of the previous researchers as well as our fundamental studies in recent years mainly on Lu-Zong basin and Ning-Wu basin, this paper discussed the geological characteristics, the temporal-spatial framework, and geochemistry, geochronology of petrogenesis and mineralizations and metallogenetic model of the volcanic basins in the Middle-Lower Yangtze metallogenetic belt. The chronological results of the igneous rocks suggest that the magmatic rocks in the volcanic basins formed in early Cretaceous (135～123Ma). The geochemical features of the volcanic rocks and the intrusive rocks in the volcanic basins indicate that their evolution, sources and the origin of the four formation volcanic rocks and the two epochs of intrusions are comparable. The source of the igneous rocks might be the metasomatic mantle; the formation of the metasomatic mantle was related to the subduction of the paleo-Pacific plate. The magma evolution underwent fractional crystallization and in the magma chamber and contamination during rising.Iron is the main mineralization occurred in the volcanic basins, which represented by the "porphyry iron deposits". The "porphyry iron deposits" include a series of volcanic-subvolcanic hydrothermal deposits,sedimentary-reformed deposits, pyrite deposits, anhydrite deposits and alunite deposits. The geological and geochemiscal characteristics of these deposits indicated that their formation were closely related to the subvolcanic rocks (diorite porphyry) and diorite intrusions, and also controlled by the volcanic structures and the basal halites in the Triassic strata. The mineralization chronology shows all the porphyry iron deposits are "booming" formed around 130Ma in a short interval. This paper proposes a petrogenetic and metallogenetic model for the volcanic basins in the Middle and Lower Yangtze metallogenetic belt. The petrogenetic and metallogenetic in these volcanic basins is one part of Mesozoic tectonic-magmatic-metallogenic event controlled by the geodynamic setting of eastern China in the Yanshanian period.关键词
火山岩盆地/地球化学特征/成岩成矿作用/成矿模式/长江中下游成矿带Key words
Volcanic basin； Geochemistry characteristics； petrogenic and metallogenic epoch/Metallogenetic model； the Middle-Lower Yangtze River metallogenetic belt引用本文复制引用
周涛发,范裕,袁峰,张乐骏,马良,钱兵,谢杰..长江中下游成矿带火山岩盆地的成岩成矿作用[J].地质学报,2011,85(5):712-730,19.基金项目
本文为国家自然科学基金项目(编号40830426,40803015)、国家"深部探测技术与实验研究专项计划"专题(编号SinoProbe-03-02-05)及国土资源部公益性行业科研专项项目课题(编号201011047-07),中国地质调查局地质调查工作项目(编号1212011121115)、"十一五"国家科技支撑计划项目(编号2009BAB43B02)、高等学校博士学科点专项科研基金(编号20100111110010)、安徽省地质公益性地质项目(编号2007-1)和新世纪优秀人才支持计划项目(编号NCET-10-0324)资助的成果. （编号40830426,40803015）
