河南栾川脉石英矿床地质地球化学特征及成因探讨
发布时间：2018-10-29 14:21
【摘要】：河南栾川脉石英矿床主要分布于河南省熊耳山地区马超营断裂带中段南侧,大地构造上处于华北陆块南缘。本文针对M4、M11、石门寨三个典型脉石英矿床进行研究,通过野外调查和室内研究,查明了脉石英矿床的构造控矿特征、矿体产状和规模、矿物组合、围岩蚀变等特征,探讨了成矿物质来源、成矿流体演化、成矿环境,总结了矿床成因类型,研究取得如下主要成果:1、M4、M11脉石英矿床赋存于熊耳群许山组斑状安山岩内,石门寨脉石英矿床赋存于熊耳群鸡蛋坪组流纹斑岩内,矿体呈脉状、透镜状,严格受断裂构造控制,走向主要为东西向,围岩蚀变主要为硅化,其他围岩蚀变不明显。2、通过流体包裹体研究,显示成矿温度主要集中在100~160℃,盐度主要集中在6%~8%NaCleqv,密度集中在0.90~1.05g/cm3,并根据均一温度—盐度的计算公式得出其成矿深度为1~2km,平均1.38km,指示其成矿流体属于浅成低温、低盐度、低密度的流体。3、通过H-O同位素研究,显示成矿流体由岩浆热液演化而来,并在岩浆驱动下,运移过程中混入了大量的大气降水,使得流体中大气降水占据主要成分。4、通过Si同位素研究,研究区脉石英矿床中石英和南泥湖、骆驼山金属矿床中石英和岩体的δ30Si相差不大,为0.1‰~0.5‰,显示其成因类型相同,且符合热液成因中石英的Si同位素组成-1.5‰~0.8‰。5、通过微量及稀土元素研究,研究区脉石英中石英和南泥湖、骆驼山金属矿床中石英的微量及稀土元素含量和分布特征差异很小,微量元素标准化蛛网图和稀土元素标准化分布型式图趋势基本一致,仅Cu、Mo、W、Ba、Sr元素的含量有差异,显示出岩浆热液流体的相似性,且可能是同一岩浆热液活动的产物。
[Abstract]:The Luanchuan vein quartz deposit in Henan Province is mainly distributed in the south of the Machaoying fault zone in Xiong'ershan area of Henan Province and is located in the southern margin of the North China continental block structurally. In this paper, three typical vein quartz deposits of M4CU M11 and Shimenzhai are studied. Through field investigation and laboratory study, the characteristics of tectonic ore-controlling, occurrence and scale of orebody, mineral assemblage and alteration of surrounding rock are found out. The source of ore-forming material, the evolution of ore-forming fluid and the metallogenic environment are discussed, and the genetic types of the deposit are summarized. The main results are as follows: 1the quartz deposit of vein M4M11 occurs in porphyry andesite of Xushan formation of Xiong er Group. The Shimenzhai vein quartz deposit occurs in the fluid grain porphyry of Qiuping formation in Xiong'er Group. The orebody is vein-like, lenticular and strictly controlled by the fault structure. Its strike is mainly east-west, its surrounding rock alteration is mainly silicified, and the other wall rock alteration is not obvious. Through fluid inclusion study, it is shown that the ore-forming temperature is mainly concentrated at 100 ~ 160 鈩，
本文编号：2297939
[Abstract]:The Luanchuan vein quartz deposit in Henan Province is mainly distributed in the south of the Machaoying fault zone in Xiong'ershan area of Henan Province and is located in the southern margin of the North China continental block structurally. In this paper, three typical vein quartz deposits of M4CU M11 and Shimenzhai are studied. Through field investigation and laboratory study, the characteristics of tectonic ore-controlling, occurrence and scale of orebody, mineral assemblage and alteration of surrounding rock are found out. The source of ore-forming material, the evolution of ore-forming fluid and the metallogenic environment are discussed, and the genetic types of the deposit are summarized. The main results are as follows: 1the quartz deposit of vein M4M11 occurs in porphyry andesite of Xushan formation of Xiong er Group. The Shimenzhai vein quartz deposit occurs in the fluid grain porphyry of Qiuping formation in Xiong'er Group. The orebody is vein-like, lenticular and strictly controlled by the fault structure. Its strike is mainly east-west, its surrounding rock alteration is mainly silicified, and the other wall rock alteration is not obvious. Through fluid inclusion study, it is shown that the ore-forming temperature is mainly concentrated at 100 ~ 160 鈩，
本文编号：2297939
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