摘要
尽管陕西汉阴长沟金矿区发现存在酸性岩石,却鲜少深入研究其成因和形成环境,因此对陕西汉阴长沟金矿区酸性岩石成因与形成环境进行深入分析。在陕西汉阴长沟矿区采集岩石样本,检测岩石中化学成分参数以及岩体微量元素质量分数,分析酸性岩石中含有的化学元素,确定酸性岩石的化学成因;在显微镜下分析陕西汉阴长沟金矿区酸性岩石特征,最终确定酸性岩石的形成原因,即早期成因是镁铁质岩浆的堆晶及结晶分离作用,晚期成因是富水镁铁质岩浆与花岗质岩浆相互作用。在此基础上分析酸性岩石形成环境,即该岩石是在陕西汉阴长沟金矿区,经历了多期变形变位的地质演变历程,在地质构造置换叠加以及强烈的火山活动影响下形成的。
Up to now,only the existence of acid rock has known in the Changgou gold ore district,Hanyin,Shaanxi;while its genesis and formation environment have not yet been studied in depth.Thus the author has carried out analysis of the issues thoroughly.Rock chemical composition parameters and rock mass microelement mass fractions in the rock samples from Changgou gold ore district have been checked;chemical elements in acid rocks analyzed and acid rock chemical genesis determined.Acid rock features in the ore district have been analyzed under microscope and determined acid rock genesis.The genesis in early stage is the mafic magma crystal cumulus and fractional crystallization;in later stage is the interactive between water-rich mafic magma and granitic magma.On this basis has analyzed acid rock formation environment,which is acid rocks in ore district have been experienced multi-staged deformation and shift geological evolutional processes,finally formed under the impacts from geological,structural displacement and superimposition,as well as strong volcanic activities.
作者
方树元
Fang Shuyuan(The Second Geological Exploration Institute,China Metallurgical Geology Bureau,Fuzhou,Fujian 350001)
出处
《中国煤炭地质》
2020年第10期22-26,共5页
Coal Geology of China
关键词
金矿区
酸性岩石
形成原因
形成环境
汉阴长沟
gold ore district
acid rock
genesis
formation environment
Changgou,Hanyin
作者简介
方树元(1966—),男,汉族,福建莆田人,本科,高级工程师,主要从事地质勘探研究。
