摘要
羊拉矿区的火山岩形成于石炭纪金沙江裂谷洋盆中段，其构造 岩浆类型有３ 种：早石炭世羊拉岩组的富集型洋中脊拉斑玄武岩（ Ｅ－ Ｍ Ｏ Ｒ Ｂ） ；晚石炭世里农岩组的洋岛钙碱性安山岩（ Ｏ Ｉ Ａ） 和洋岛碱性玄武岩（ Ｏ Ｉ Ｂ） 。 Ｏ Ｉ Ａ 是 Ｏ Ｉ Ｂ 与 Ｅ－ Ｍ Ｏ Ｒ Ｂ 混合岩浆结晶分异的产物，部分 Ｅ－ Ｍ Ｏ Ｒ Ｂ 是由 Ｏ Ｉ Ｂ 与 Ｎ－ Ｍ Ｏ Ｒ Ｂ 进行物质能量交换后形成的。各种构造
Ln the Yangla ore district, the volcanic rocks were formed in the central part of Jinshajiang rift-oceanic basin.There are three kinds of tectono_magmatic types:Early Carboniferous enrichment mid_ocean ridge tholeiitic basalts (E-MORB) of Yangla Formation Complex,Late Carboniferous ocean_island calc_alkalic andesite(OIA )and ocean_island alkalic basalts(OIB) of Linong Formation Complex. OIA was produced by crystallization differtiation of OIB and E_MORB mixed magma,and part of E_MORB was formed by mass and energy exchange of OIB and N_MORB.The formation of tectono_magmatic types was related to the mantle plume.
基金
国土资源部资源与环境攻关项目
定向基金项目"滇西德钦羊拉地区铜矿成矿条件及远景预测(95 - 12)"课题
关键词
洋中脊
玄武岩
构造-岩浆类型
火山岩
mid_ocean ridge basalts ocean_island basalts ocean_island andesite
