| 郭彬,张辉,何娇月.内蒙古乌尔吉地区早白垩世侵入岩地球化学特征与成矿远景预测[J].矿产勘查,2015,6(6):679-688 |
| 内蒙古乌尔吉地区早白垩世侵入岩地球化学特征与成矿远景预测 |
| Geochemical characteristics of early-Cretaceous intrusive rocks and metallogenic prediction in Wuerji area, Inner Mongolia |
| 投稿时间：2015-03-24 |
| DOI： |
| 中文关键词: 乌尔吉地区 早白垩世 侵入岩 岩石地球化学 成矿远景区 |
| 英文关键词: early Cretaceous intrusive rocks, rock geochemistry, metallogenic prospecting area, Wuerji area, Inner Mongolia |
| 基金项目: |
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| 中文摘要: |
| 乌尔吉地区地处中亚造山带东段,属大兴安岭南段铅锌银铜锡铁成矿带。区内早白垩世岩浆侵入活动强烈,岩石学及岩石地球化学研究表明:早白垩世侵入岩由斜长花岗岩—花岗闪长岩—二长花岗岩—钾长花岗岩—碱长花岗岩岩石序列组成,岩浆分异演化程度高,总体为强过铝质高钾钙碱性岩系列,是太平洋板块向欧亚板块俯冲结束后造山环境下的产物。早白垩世侵入体中富集Zn、Pb、Ag、Sn、Mo、W、As等成矿元素,岩浆侵入也为成矿元素的萃取、运移提供了热源,其中第二期侵入的花岗闪长岩和第四期侵入的钾长花岗岩与成矿关系最为密切。结合岩浆岩与构造控矿条件分析,该区成矿潜力巨大,特别是早白垩世侵入体侵入时间长,提供的热源充足,成矿物质丰富,是寻找热液型铅锌银矿、云英岩型钨锡矿和热液型金矿的最佳场所,最终在本地区初步圈定了4处成矿远景区。 |
| 英文摘要: |
| The Wuerji area located in the eastern part of central asian orogenic zone, occurs at the southern Daxinganling lead-zinc-silver-copper-tin-iron metallogenic zone. The early Cretaceous intrusive magmatic activities are very intensively in this area. The study results of petrology and rock geochemistry indicate that the intrusive rocks of early Cretaceous composed of rock sequences as plagioclase granite-granodiorite-adamellite-moyite-alkali feldspar granite with a high degree of magma evolution, overall, the intrusive rocks belong to strongly peraluminous, high potassium and calc-alkaline rock series, and are the evolution product oforogenic environment after the Pacific plate overthrusting the Eurasian plate. The early Cretaceous intrusion is enrichment with Zn, Pb, Ag, Sn, Mo, W, As and other metallogenic elements. Magmatic intrusion also provided the heat source for the extraction and migration of metallogenic elements. Among them, the second period intrusive granodiorite and fourth intrusive feldspar granite are closely associated with mineralization. Based on integrated analysis of ore-bearing intrusive rocks and the ore-controlling structural conditions, it is believed there is great prospecting potential in this area. Especially, the early Cretaceous intrusive bodies with a longtime invasion provide adequate heat source and rich metallogenic materials, therefore, it is very favorable for prospecting hydrothermal lead-zinc-silver type deposit, greisen type tungsten-tin deposit and hydrothermal type gold deposit. Finally, four metallogenic prospecting areas are initially delineated in the area. |
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