北淮阳构造带东段响洪甸地区成岩成矿作用研究

发布时间：2018-06-15 02:35

本文选题：响洪甸碱性杂岩体 + 钼矿　；参考：《合肥工业大学》2015年硕士论文

【摘要】：随着金寨沙坪沟超大型钼矿床的发现,北淮阳构造带东段中生代中酸岩浆岩与成矿作用的关系已成为地质找矿工作重点。本文依托安徽省公益性地质工作项目“六安市西峰寺地区铝多金属矿成矿条件调查”(2013-g-11),通过对响洪甸碱性杂岩体的岩石化学、稀土和微量元素分析测试、碱性侵入岩的LA-ICPMS锆石U-Pb测年、辉钼矿Re-Os同位素测年以及综合分析整理,着重研究响洪甸碱性侵入岩和火山岩的岩石学特征、方家洼铝矿床的地质特征及成因探讨,总结成矿规律,为本区找矿提供科学理论基础。响洪甸火山岩以假白榴石响岩、粗面质凝灰熔岩和粗面质一假白榴石响岩质火山角砾岩为主。碱性侵入岩岩石组合为正长岩、碱性正长岩和霞石正长岩,成岩时代划分为3个期次：早期霞石正长岩的年龄为130-136Ma,中期为正长岩和正长斑岩,成岩年龄为125-130 Ma,晚期为碱性正长岩年龄为122-125 Ma。碱性侵入岩和火山岩具有相似的地球化学特征,总体为富碱、高钾、贫钛的碱性-过碱性岩石,均具有富集大离子亲石元素K、Rb、U、Sr、Nd、相对亏损高场强元素Nb、Ta、P、Ti,较高的稀土元素的总量,富集轻重稀土元素等特点,显示本区岩浆演化程度为中等,二者岩浆岩源区物质组成相似、有同源的演化特征。方家洼钼矿床成矿年龄为123.6Ma,属大别山钼成矿带晚燕山成矿期。成矿物质来源于正长斑岩,成矿流体具低温低盐的特征,矿床成因属斑岩型钼矿床大类。NWW向断裂与NE向断裂交汇部位为热液运移提供了良好的通道和容矿空间,后期正长斑岩与成矿关系密切。
[Abstract]:With the discovery of the super large molybdenum deposit in the Jinzhai Sha Ping gully, the relationship between Mesozoic middle acid magmatic rocks and mineralization in the eastern part of the northern Huaiyang tectonic belt has become the focus of geological prospecting. This paper relies on the "investigation of the metallogenic conditions of the aluminum polymetallic ore in the Xifeng Temple area of Lu'an" (2013-g-11), through the public welfare geological project of Anhui Province, through the randine base The petrochemistry of the sexual complex, the analysis and test of rare earth and trace elements, the LA-ICPMS zircon U-Pb dating of the alkaline intrusive rocks, the Re-Os isotope dating of molybdenite and the comprehensive analysis and arrangement, mainly study the petrological characteristics of the alkaline intrusive and volcanic rocks of the Xiang Hong Dian, the geological characteristics and genesis of the Fangjia DIWA al deposit, and the metallogenic regularity. It provides a scientific basis for ore prospecting in this area. The volcanic rocks of Xiang Hong Dian are mainly composed of false white granite, coarse and coarse, and coarse, and white garite ringing volcanic breccia. The alkaline intrusive rock is composed of syenite, alkaline syenite and nepheline syenite, and the age of diagenesis is divided into 3 stages: the age of early nepheline syenite is 13 0-136Ma, in the middle period, is diorite and normal porphyry, the age of diagenesis is 125-130 Ma, and the later period of alkaline syenite is 122-125 Ma. alkaline intrusive rock and volcanic rock with similar geochemical characteristics. The whole is alkali rich, high potassium and alkaline alkaline rock of poor titanium. All of them have rich ion stone elements, K, Rb, U, Sr, Nd, and relatively high field strength. The elements Nb, Ta, P, Ti, the total amount of rare earth elements, and the enrichment of the light and heavy rare earth elements, show that the magma evolution in this area is medium, and the two magmatic source areas are similar in material composition and have the same homologous evolution characteristics. The metallogenic age of the Fangjia Mo deposit is 123.6Ma, which belongs to the late Yanshan metallogenic period of the Dabieshan molybdenum metallogenic belt. The source of the metallogenic material is Yu Zheng long. Porphyry and ore-forming fluids are characterized by low temperature and low salinity. The genesis of the ore deposit is a good channel and ore bearing space for the hydrothermal migration of the large.NWW trending fault and NE fault zone of the porphyry molybdenum deposit, and the later syenite porphyry is closely related to the mineralization.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P612

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