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滇中郝家河、六苴铜矿床地质地球化学特征对比研究
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摘要
本文是在导师承担的全国危机矿山接替资源找矿项目“云南省牟定县郝家河铜矿接替资源勘查”(项目编号:200653098)、“云南省大姚县六苴铜矿小河-石门坝矿段接替资源勘查”(项目编号:200453001)以及“西南地区层控型多金属矿床成矿规律总结研究”(项目编号:20089943)的资助下完成。
     本文主要以郝家河、六苴两个铜矿床为研究对象,分析二者在矿区地层、含矿地层、岩石岩性、岩石组构、矿物及矿物组合、元素及元素分带规律等方面的一致性及差异性,并与国内外典型陆相砂岩铜矿地质地球化学特征及成因特征进行对比研究,为相似砂岩型的地层找矿提供科学依据。
     (1)郝家河、六苴铜矿床在地层、岩性、矿石类型、矿石矿物组成、金属矿物分带上具有一致性。
     (2)郝家河矿床在形成过程中受构造改造作用影响相对严重,表现在矿体规模、形态、产状及矿石组构上同六苴矿床比较更为复杂。
     (3)郝家河、六苴铜矿床岩石主量元素、稀土元素具有几乎一致的特征,而微量元素特征有所不同,致使两矿床在微量元素分带上有所差异。
     (4)通过研究郝家河、六苴铜矿床马头山组岩石的主量元素、微量元素和稀土元素地球化学特征,结合构造判别图解,得出两地区源区构造背景主要为被动大陆边缘和活动大陆边缘;沉积物源的原始物质来自上地壳,以长英质为主,属于典型的大陆型沉积体系。结合分析,认为马头山组物源区主要为东侧具有稳定被动大陆边缘建造的康滇古陆和西侧组成为活动陆缘-造山作用产物的哀牢山造山带。
     (5)通过与国内外典型陆相砂岩铜矿床对比,发现它们在区域大地构造背景、含矿层岩性特征、矿体特征、矿石特征、成因特征等方面存在明显共性。
This article is based on the Project of Superseding Resources Exploration for the State Crisis Mine—"Superseding Resources Exploration to the Haojiahe Copper Deposit, Mouding, Yunnan Province" (Item number:200653098), " Superseding Resourse Exploration to the Xiaohe-Shimenkan Ore-body in Liuju Copper Deposit, Dayao Yunnan Province "(Item number:200453001), and" Metallogenic Regularitys Research on tratabound polymetallic deposit in Southwest of China "(Item number:20089943).
     Take the Haojiahe and Liuju copper deposits as study objects, analysis the consistency and diversity in the mining stratum, the ore formation, the lithology of the rock, the rock fabric, the mineral and the mineral composition, elements and element zoning and so on. What's more, comparing the geochemical characteristics and the genesis with the typical continental sandstone coppers from home and abroad, to provide a scientific basis for finding the similar sandstone-type ore formation.
     (1) Haojiahe, Liuju copper deposits have the consistency in the formation, lithology, ore type, ore minerals, metallic minerals sub-belt and so on.
     (2) Haojiahe deposits affected by the structural transformation is more serious, shown in Haojiahe deposits more complex than Liuju in the ore body size, shape, occurrence and structure.
     (3) Haojiahe and Liuju copper deposits rock almost have the same features in the major elements, rare earth elements, the characteristics of trace elements are different, lead to the banding is also different.
     (4) Through researching the major elements,trace elements and REE geochemistry of the Matoushan formation rocks from Haojiahe, Liuju copper deposit, combined with the tectonic discrimination diagrams, refer that the provenance of Matoushan formation belongs to passive continental margin and active continental margin tectonic setting. The primary materials of sedimentary rocks should come from the upper continental crust, and are mainly composed by felsic rocks. Combined with the data of sedimentary facies and palaeogeography, we know that the principal source rock area of Matoushan formation are Kangdian ancient land and Ailaoshan orogenic belt.
     (5) Compared with the typical continental sandstone copper deposits abroad, Show that there are some obvious similarities in the regional tectonic setting, seam lithology, geological characteristics, ore characteristics, Genesis and so on.
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