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| 云南个旧卡房中三叠世安尼期变火山岩相序恢复及成矿分析 | |
| 引用本文： | 张 海,方维萱 张贵山 甘凤伟 魏 宁,郭玉乾.云南个旧卡房中三叠世安尼期变火山岩相序恢复及成矿分析[J].中国地质,2009,36(6):1322-1330. |
| 作者姓名： | 张 海 方维萱 张贵山 甘凤伟 魏 宁 郭玉乾 |
| 作者单位： | 1. 中国地质大学(北京)地球科学与资源学院,北京,100083;北京矿产地质研究院,北京,100012 2. 北京矿产地质研究院,北京,100012 3. 长安大学地球科学与资源学院,陕西,西安,710054 |
| 基金项目： | 危机矿山元素综合查定和可利用性评价技术(2008EG115074)资助、中色地科研发项目(RD21)"岩相地球化学勘查新方法试验研究"和昆明中色地科研发项目 |
| 摘 要： | 中三叠世安尼期个旧组卡房段变火山岩恢复为一套碱性基性-超基性岩组合,火山岩-沉积岩岩相组合包括爆发相、喷溢相、火山沉积相、潮坪相、后期盆地流体叠加相、矽卡岩相.垂向相序表现为爆发相→喷溢相→火山沉积相→潮坪相,属于弧后裂谷盆地背景下形成的岩相组合与相序结构.在研究区卡房段可划分为3个期次,进而组成一个旋回,垂直相序特征表明火山活动的多期次性、火山活动由强到弱的变化规律.后期盆地流体叠加相、矽卡岩相作为主要含矿岩相,可以作为今后的找矿指标. |
| 关 键 词： | 中三叠世安尼期 火山岩相 碱性基性-超基性岩 云南个旧 |
Facies sequence reestablishment and metallogenic analysis of Middle Triassic Anisian meta-volcanic rocks in the Kafang ore district, Gejiu, Yunnan |
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| ZHANG Hai,FANG Wei-xuan,Zhang Guishan,GAN Feng-wei,WEI Ning,Guo Yu-qian.Facies sequence reestablishment and metallogenic analysis of Middle Triassic Anisian meta-volcanic rocks in the Kafang ore district, Gejiu, Yunnan[J].Chinese Geology,2009,36(6):1322-1330. | |
| Authors: | ZHANG Hai FANG Wei-xuan Zhang Guishan GAN Feng-wei WEI Ning Guo Yu-qian |
| Abstract: | The Middle Triassic Anisian meta-volcanic rocks in Kafang Member of Gejiu Formation could be restored into a set of alkaline basic-ultrabasic rock assemblages. The restored volcanic and sedimentary lithofacies includes explosive fades, effusive fades, volcanic sedimentary fades, tidal flat fades, late-basin-fluid superimposed fades and skarn fades. It is considered that the vertical fades sequence might be in order of explosive fades→ effusive fades→volcanic sedimentary fades→tidal flat fades, belonging to the fades sequence structure and fades assemblage formed in a back-arc rift basin background. Kafang Member is divided into 3 volcanic stages in the study area, which composed a volcanic cycle. The characteristics of the vertical phase sequence indicate multi-stages of volcanic activities and variation of volcanic activities from strong to weak. Late-basin-fluid superimposed fades and skam fades can be regarded as ore-bearing lithofacies and an ore-prospecting index in future. |
| Keywords: | Middle Triassic Anisian period volcanic fades alkaline basic-ultrabasic rock Gejiu Yunnan |
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