北山地区花牛山群的重新厘定——来自火山岩地球化学证据  

The Redefinition of Huaniushan Group in Beishan area:Geochemical Evidence from Volcanic Rocks

作　　者：余吉远[1,2] 王国强[1,2,3] 李向民[1,2] 计波[1,2] 闫巧娟[3] 

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]中国地质调查局西安地质调查中心岩浆作用成矿与找矿重点实验室,陕西西安710054 [3]长安大学地球科学与国土资源学院,陕西西安710064

出　　处：《新疆地质》2015年第4期537-543,共7页Xinjiang Geology

基　　金：国家自然科学基金项目中天山构造带阿拉塔格环状杂岩体成因研究(41202045);中国地质调查局大调查项目北山-祁连成矿带基础地质综合研究(1212010010405)资助

摘　　要：花牛山群火山岩地球化学特征及形成构造背景不清,导致花牛山铅锌矿床成矿地质背景及找矿方向不明确。在已有研究成果基础上,通过野外路线地质调查,据主量、微量及稀土元素地球化学等资料探讨其形成构造背景,认为原划花牛山群包含两期火山岩:1以残片形态出露的蓟县纪火山岩,为花牛山铅锌矿赋矿围岩;2形成环境为有限洋盆拉张环境的奥陶纪火山岩及不含矿火山岩。通过花牛山群火山岩岩石组合特征、形成构造背景、时代,重新厘定花牛山群,指出"花牛山式"矿床找矿方向为蓟县系并非奥陶系,为北山地区寻找"花牛山式"矿床提供了新依据。The geochemical characteristics and tectonic setting of Huaniushan Group volcanic rocks are undefined, it caused directly that the geological background and prospecting direction of Huaniushan lead and zinc deposit are undefined. Based on the previous research, detailed field geological survey and the data of major element, trace element and Rare Earth Elements（REE） of the volcanic rocks, we can discuss its tectonic background and redivide the volcanic rocks of the previous Huaniushan group into two stages. The volcanic rocks of the Jixianian Period is exposed as fragments morphology, which is the host rock of Huaniushan lead- zinc deposit. And the volcano rocks of the Huaniushan Group are really without mineralization, which is formed in an extensional environment of limited oceanic basin. Base on rock association characteristics, tectonic setting and age of the Huaniushan group, we redefined Huaniushan group, and further pointed out that＂Huaniushan type＂deposit prospecting is the strata of Jixianian Period rather than the strata of the Ordovician Period, which provide new evidences to prospect the＂Huaniushan type＂deposit in Beishan area.

关 键 词：甘肃北山 花牛山群 火山岩 地球化学特征 

分 类 号：P588.14[天文地球—岩石学] P618.4[天文地球—地质学]