内蒙古孟恩陶勒盖多金属成矿远景区的成矿地质特征及找矿前景

doi:10.13278/j.cnki.jjuese.201502112

摘要/Abstract

摘要：

通过1:5万区调工作,将远景区内孟恩陶勒盖岩体解体为英云闪长岩、花岗闪长岩和二长花岗岩,并对各岩体开展了地球化学和年代学研究。地球化学分析结果表明:英云闪长岩、花岗闪长岩、二长花岗岩均属高钾钙碱性系列,富Si,过铝质,由早到晚总体表现出酸性增强,碱度加大,铝质降低,镁、铁减少的趋势。通过与I型、S型花岗岩对比可知,其属S型花岗岩,主要为壳源物质熔融的产物。LA-ICP-MS锆石测年结果表明:英云闪长岩、花岗闪长岩、二长花岗岩的加权平均年龄分别为 (260±34)、(234±1)和(230±1) Ma,代表中三叠世岩浆活动,可认为该区存在印支期构造-岩浆事件。据区内矿产、矿体分布特征及收集的各矿床硫、铅、氧同位素数据,结合野外地质工作,分析了区内岩体、地层、构造与成矿的关系,认为成矿物质来源主要与燕山期岩浆活动有关,成矿母岩可能在远景区西部深部,尚未出露;区内岩体和地层在成矿过程中主要承担有利成矿围岩的作用;断裂构造在成矿过程中意义重大,起到导矿和容矿的作用,应在下一步找矿工作中予以重视。

关键词: 孟恩陶勒盖多金属矿床, 成矿远景区, 成矿地质特征, 地球化学, 年代学, S型花岗岩

Abstract:

The geochemistry and geochronology of the tonalite, granodiorite and adamellite dismantled from the Meng'entaolegai rock are studied. The geochemical analyses show the content of SiO₂ is between 67.41% and 76.21%, while the content of K₂O is between 3.00% and 5.64%. The tonalite, granodiorite and adamellite all belong to the series of high potassium ca-alkaline. From early to late of their formation,the acidity and alkalinity are enhanced,while the aluminum, magnesium and iron are reduced. The Al₂O₃/(Na₂O+CaO+K₂O) values are higher than 1.1, the standard mineral calculation C is higher than 1%, n(⁸⁷sr)/n(⁸⁶sr) is generally greater than 0.708. The ratio of n(¹⁴³Nd)/n(¹⁴⁴Nd) falls in the range of 0.512 4 to 0.513 7, the characteristics of the S-type granite, while they belong to the per-aluminous granite based on A/CNK (1.013 to 1.249) and A/NK (1.16 to 1.50). The rockmass is mainly from the melten shell material. They are enriched in LILE elements of Rb, K, U, Th, depleted of Ti. The deficiency of Ba, Sr may reflect that the source is derived from the partial melting of the crust. The LA-ICP-MS dating respectively presents three weighted average ages for the tonalite, granodiorite and adamellite: (260±34) Ma, (234±1) Ma, and (230±1) Ma. It indicates the existence of the magmatic activity during Middle Triassic and Indosinian period. According to the distribution of minerals and ores, as well as the δ³⁴S, Pb, O isotopic data of the deposits, the source of metallogenic materials was mainly related to the magmatic activity in Yanshan period, the corresponding mother rock may exist in deep underground in the western prospecting area. The rock and the stratum are mainly responsible for the favorable wall rock in the ore-forming process; the fault structures played a significant role in ore flowing and storing. Further attention should be paid to the ore prospecting work.

Key words: Meng'entaolegai polymetallicdeposit, metallogenic prospective area, metallogenic geological characteristics, geochemical, chronology, S-type granite

中图分类号:

P618.2

庞雪娇, 宋维民, 付俊彧, 陶楠. 内蒙古孟恩陶勒盖多金属成矿远景区的成矿地质特征及找矿前景[J]. 吉林大学学报(地球科学版), 2015, 45(2): 483-494.

Pang Xuejiao, Song Weimin, Fu Junyu, Tao Nan. Metallogenic and Geological Characteristics and Prospecting Potential of Meng'entaolegai Multi Metal Metallogenic Area in Inner Mongolia[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(2): 483-494.

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