贵州西部地区“玄武岩-古风化壳沉积(堆积)型”铁矿成矿作用与成矿模式  

Ore-Forming Role and Its Model of a Sedimentary(Accumulation)Type of Iron Deposits from Basalt-Paleo-Weathering Crust in Western Guizhou

作　　者：刘幼平[1] 程国繁[1] 刘坤[1] 崔滔[1] Liu Youping Cheng Guofan Liu Kun Cui Tao(Guizhou Institute of Technology, Guiyang 550003, Chin)

机构地区：[1]贵州理工学院,贵阳550003

出　　处：《地质科技情报》2017年第4期107-112,共6页Geological Science and Technology Information

基　　金：贵州省国土资源厅公益性基础性地质工作项目"贵州省西部地区铁矿成矿规律;控矿因素与成矿预测研究"(2015-21);贵州理工学院教学团队建设项目(2014JXD01)

摘　　要：在阐述了"玄武岩-古风化壳沉积(堆积)型"铁矿的成矿背景和成矿地质特征的基础上,讨论了铁矿的风化、剥蚀、搬运、沉积(堆积)、成岩后期变化、淋滤富集成矿作用,并将成矿过程划分为3期6个阶段,3期分别为:矿源层形成期、含铁岩系形成期、淋滤富集成矿期;6个阶段分别为:峨眉地幔柱上隆-玄武岩浆喷溢阶段、风化蚀顶-玄武岩古风化壳形成阶段、古风化壳沉积物堆积-迁移-沉积-含矿层形成阶段,地壳振荡性升降-暴露-含矿层风化淋滤阶段、含矿层次生富集成矿阶段、含矿层被覆盖保存阶段,从而建立了"玄武岩-古风化壳沉积(堆积)型"铁矿的成矿模式。On the basis of the metallogenetic setting and metallogenetic geological characteristics of iron deposits from basalt-paleo-weathering crust,this paper discusses the ore-forming role,including weathering,denudation,transportation,deposition or accumulation,late diagenetic change and leaching.A relative process can be divided into 3periods：resource forming,iron-bearing layer formation and leaching-enrichment and 6stages：Emei plume upwelling-basaltic magma eruption,un-roofing-basalt weathering crust formation,accumulation of weathering crust,migration of sedimentary-ore bearing formation,periodicity crust going up and down-leaching enrichment and ore bearing layer in hidden respectively.According to this division,a description model is established at last.

关 键 词：玄武岩 古风化壳 铁矿 成矿作用 成矿模式 贵州西部 

分 类 号：P618.31[天文地球—矿床学]