摘要
通过湖南宝山地区花岗闪长质隐爆角砾岩体的岩石学、地球化学特征的研究, 表明岩体中的角砾与基质岩石的特征大致相近, 均为高钾钙碱性准铝质花岗质岩石, 其成因为壳-幔同熔型。锆石SHRIMPU Pb定年研究表明, 隐爆角砾岩中花岗闪长斑岩的角砾岩石年龄为(164 1±1 9) Ma, 基质岩石年龄为(162 2±1 6) Ma, 表明两者的形成时间相近, 是燕山期构造岩浆作用的产物。隐爆角砾岩体的岩石学、地球化学特征又与其共生的含矿花岗闪长斑岩体相似, 岩体中的角砾与基质岩石中的W、Mo、Cu、Pb、Zn成矿元素丰度都很高, 其周围有利部位也有矿化, 说明隐爆角砾岩体同样可为成矿母岩, 这对该区岩体成因及其多金属矿成矿作用的研究具有重要的意义。
The study on the cryptoexplosion breccia in petrology and geochemistry indicates that the breccia and matrix are high potassium calc alkaline metaluminous granodiorite, which formed through crust mantle interaction Zircon SHRIMP dating shows that breccia of granodriorite yields 207 Pb/ 206 Pb age of 164 1±1 9 Ma, and matrix of granodiorite yields 162 2±1 6 Ma Both breccia and matrix almost formed at the same time Petrological and geochemical characteristics of granodioritic cryptoexplosion breccia are the same as ore bearing granodiorite porphyry The contents of metallogenic elements, such as W, Mo, Cu, Pb, Zn, etc , are very high in the breccia and matrix And there are some polymetallic mineralizations in the boundary between granodioritic cryptoexplosion breccia and country rocks It infers that granodioritic cryptoexplosion breccia may be the ore bearing parent rock as well So this has a very important significance to exploring more polymetallic ore deposits in the research area
出处
《现代地质》
CAS
CSCD
北大核心
2005年第2期198-204,共7页
Geoscience
基金
中国地质调查局国土资源大调查项目 (1212010310206)
中国地质调查局区域地质调查项目 (200213000035)。
