高校地质学报2018，Vol.24Issue(3)：325-339,15.DOI:10.16108/j.issn1006-7493.2017131
安徽铜陵地区晚中生代早、晚两期侵入岩的地质和地球化学特征
Geological and Geochemical Characteristics of the Intrusive Rocks of Early and Late Stages during Late Mesozoic in Tongling District, Anhui Province
摘要
Abstract
The Tongling district of Anhui Province is an important ore concentrating area in the tectonic-magmatic-metallogenic belt of the middle and lower reaches of Yangtze River in eastern China. The copper-gold polymetallic deposits in this area are closely related to the Late Mesozoic (Late Yanshanian) magmatism. Previous studies have suggested that the isotopic ages of intrusive rocks are concentrated in the range of 147-135 Ma. Based on the new zircon U-Pb dating results, this study found that there are a small amount of intrusions were formed between 132-124 Ma. Therefore, according to these new age data of the intrusive rocks, the magmatism during the Late Mesozoic in the Tongling district can be divided into two stages, corresponding to Late Jurassic-Early Cretaceous and Early Cretaceous, respectively. This paper has systematically studied the geological characteristics of the two stage intrusive rocks, including rock types, occurrences and spatial distribution, and geochemical characteristics of major, trace and rare earth elements. By comparing these two stage intrusive rocks with the volcanic-intrusive rocks in Ningwu and Luzong basins, it is concluded that the early and the late stage magmatism were generated under a transitional setting from compression to extension and an extensional setting, respectively. The late stage intrusive rocks were formed jointly by re-emplacement of magma from the early stage magma chamber and magma from further partial melting of the deep crust. The significance of the mineralization related to the late stage intrusion can not be ignored.关键词
晚中生代侵入岩/同位素地质年龄/地质和地球化学特征/构造背景/安徽铜陵地区Key words
Late Mesozoic intrusive rocks/isotopic ages/geological and geochemical characteristics/tectonic setting/Tongling district of Anhui Province分类
天文与地球科学引用本文复制引用
徐晓春,左续,何俊,傅仲阳..安徽铜陵地区晚中生代早、晚两期侵入岩的地质和地球化学特征[J].高校地质学报,2018,24(3):325-339,15.基金项目
国家自然科学基金(41472066) （41472066）
国家重点研发计划项目(2016YFC0600209)联合资助 （2016YFC0600209）
