豫西南泥湖钼多金属矿田地质地球化学找矿模型

发布时间：2018-04-01 09:10

本文选题：豫西　切入点：南泥湖　出处：《中国地质大学(北京)》2015年硕士论文

【摘要】：豫西地区,是东秦岭钼矿带的重要组成部分。南泥湖钼多金属矿田位于豫西洛阳市栾川县南部的冷水镇境内,在成矿带划分上位于华北(陆块)成矿省华北陆块南缘成矿带之小秦岭—豫西成矿亚带,矿田内钼、钨、铅、锌资源丰富,找矿潜力巨大。矿田内分布有南泥湖、三道庄、上房沟三个超大型斑岩-矽卡岩型钼矿床,是该区钼矿床的主要类型之一。通过研究建立南泥湖钼矿田典型钼矿床的地质-地球化学找矿模型,总结出区内较典型的斑岩-矽卡岩型钼矿床的一套成矿规律、找矿标志等,对于指导新矿体的发现,扩大矿床规模,甚至对找矿战略布局及战术性的找矿评价工作都将具有重要的指导作用。本文在收集南泥湖钼矿田内地质资料和区域岩石、蚀变岩与矿石、区域水系沉积物化探数据、中大比例尺水系沉积物化探数据的基础上,研究区内三个超大型矿床的地质特征、地球化学异常特征,建立了三个矿床的地质-地球化学找矿模型。得出以下结论:1、南泥湖钼多金属矿田内三个超大型斑岩-矽卡岩型矿床矿体均呈出露状态,赋矿地层为栾川群矽卡岩和角岩,成矿与南泥湖和上房沟两个燕山期花岗斑岩体密切相关。区内北西向及北东向构造共同作用,控制了燕山期中酸性岩体的侵入与矿床的分布。主要矿石类型为矽卡岩型、斑岩型、角岩型,围岩蚀变主要为主要有矽卡岩化、钾化、硅化三种。2、与中国花岗岩相比,南泥湖钼多金属矿田花岗岩类岩石明显富集Cu、Zn、Nb、Ta、Th、U、Rb、Cr、Ga、Ge等元素,富集系数大于1.2;稀土元素较贫化。与区域岩石相比,南泥湖钼多金属矿田内蚀变岩明显富集Sr、V、Cr、Co、Ni、Zn、Ga、Ba、Pb和Sc等元素,富集系数大于1.19。中大比例尺水系沉积物化探研究显示,该区成矿指示元素组合为Mo、W、Pb、Zn、Au、Ag、Cu、As计8项元素;相对于中国水系沉积物而言,区内Pb、Mo、Ag、W、Zn明显富集,富集系数大于5.0。区域水系沉积物化探研究显示,可作为该区成矿指示元素的有Mo、W、Bi、Cu、Pb、Zn、Cd、Au、Ag、F、Mn、P、V、As、Sb、Sn计16种元素;相对于中国水系沉积物而言,区内明显富集的元素有Pb、Cd、W、Ag、Bi、Zn、Mo,富集系数均大于2.5。
[Abstract]:The West Henan area is an important part of the East Qinling molybdenum ore belt. The South Nainihu molybdenum polymetallic ore field is located in Lengshui Town in the south of Luanchuan County, Luoyang City, Western Henan Province. The ore-forming subzone of Xiaoqinling-Western Henan Province is located in the southern margin of the North China block in the division of metallogenic belt. The ore field is rich in molybdenum, tungsten, lead and zinc resources and has great prospecting potential. Three superlarge porphyry skarn type molybdenum deposits in Shangfanggou are one of the main types of molybdenum deposits in this area. A set of metallogenic rules and prospecting marks of typical porphyry skarn type molybdenum deposits in the area are summarized, which can guide the discovery of new orebodies and enlarge the scale of the deposits. This paper collects geological data and regional rock, altered rock and ore, regional water system sediment geochemical exploration data in Nannihu molybdenum ore field. On the basis of geochemical exploration data of sediments in large and medium scale water system, the geological characteristics and geochemical anomalies of three super large deposits in this area are studied. The geological geochemical prospecting models of the three deposits are established, and the following conclusions are drawn: the orebodies of the three super-large porphyry skarn type deposits in the South Nihu Molybdenum Polymetallic Orefield are exposed, and the ore-bearing strata are skarn and hornstone of Luanchuan group. The mineralization is closely related to the Yanshanian granitic porphyry in Nannihu and Shangfanggou. The interaction of NW and NNE structures controls the intrusions and the distribution of Yanshanian intermediate acidic rock bodies. The main ore types are skarn type. Porphyry type, hornstone type and wall rock alteration are mainly composed of skarn, potassium and silicification. Compared with Chinese granites, the granite rocks in the molybdenum polymetallic ore field of Nannihu Lake are obviously enriched in the elements such as Cuznznzhu-NbPu, Th _ (+) ~ (+) ~ (-) ~ (-) ~ ((1)) ~ ((1)) ~ (-) ~ ((1)), etc. The enrichment coefficient is greater than 1.2 and the rare earth element is relatively poor. Compared with the regional rocks, the altered rocks in the molybdenum polymetallic ore field of Nannihu Lake are obviously enriched in elements such as Sr _ (V) _ (V) _ (Cr) _ (C) _ (1) ~ ((1)) ~ (-) ~ (-) ~ (-) ~ (-) ~ ((1)), and the enrichment coefficient is greater than 1.19. The results of geochemical exploration on medium and large scale hydrological sediments show that. The ore-forming indicator element assemblage in this area is composed of 8 elements, which are composed of eight elements, and the Pb MoMoAg-WN Zn in this area is obviously enriched with a enrichment coefficient greater than 5.0 compared with the sediments of the Chinese water system, and the geochemical exploration of the regional drainage sediments shows that, There are 16 kinds of elements which can be used as indicator elements for mineralization in this area, and there are 16 kinds of elements in this area. Compared with the sediments of Chinese water system, the obvious enrichment elements in this area are PbCU, CDW, AgBiZnMo, and the enrichment coefficients are all more than 2.5.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2

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