论铁氧化物铜金型（IOCG）矿床地球化学岩相学填图新技术研发

doi:10.11867/j.issn.1001-8166.2012.10.1178

地球科学进展 doi: 10.11867/j.issn.1001-8166.2012.10.1178

地球化学探矿新技术上一篇

论铁氧化物铜金型（IOCG）矿床地球化学岩相学填图新技术研发

方维萱

1.中色地科矿产勘查股份有限公司，北京 100012； 2.昆明中色地科矿产勘查有限责任公司，云南昆明 650224

收稿日期:2012-07-24 修回日期:2012-08-27 出版日期:2012-10-10
基金资助:
科技部国家科技支撑计划项目“东川—易门铜矿山深部及外围勘查技术研究”（编号：2006BAB01B09）；转制院所专项资金项目“铁氧化物铜金型矿床元素赋存状态及岩相构造学填图技术研发”（编号：2011EG115022）；昆明中色地科研发项目“个旧锡矿铜多金属矿山工程地球化学勘探技术集成”（编号：KZSDK-2007-03）资助.

R&D on New Mapping Technology of Geochemical Lithofacies in Prediction and Exploration for IronOxide Copper Gold Deposits (IOCG)

Fang Weixuan

1.SinoTech Mineral Exploration Joint-stock Company，Beijing 100012，China；2. Kunming SinoTech Mineral Exploration LLC., Kunming 650224，China

Received:2012-07-24 Revised:2012-08-27 Online:2012-10-10 Published:2012-10-10

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在铁质苦橄岩—铁质安山岩、钛铁辉长岩—钛铁质闪长岩和二长岩—二长斑岩岩体附近，同岩浆侵入期脆韧性剪切带中构造岩相和热液角砾岩相，它们是铁氧化物铜金型（IOCG）矿床含矿岩相学类型。总体垂向蚀变分带为：上部为粘土化—绢云母化—赤铁矿蚀变带，中部钾质蚀变相带（电气石—铁质）+热液角砾岩化相带，下部钠质蚀变相（铁质）—热液角砾岩化带。围绕二长斑岩—二长闪长岩舌状侵入体形成电气石蚀变岩相带，属于汽成热液蚀变中心。大型—超大型IOCG矿床具有多期蚀变相系叠加特征，不同成因的热液角砾岩化相带发育、异时同位多期蚀变岩相叠加和汽成热液蚀变相发育等是寻找大型—超大型IOCG矿床标志。

关键词: 地球化学岩相学, 碱性蚀变岩相系, 酸性蚀变相系, 热液角砾岩相, 蚀变分带

Tectonic lithofacies and breccia lithofacies of hydrothermal fluid were hosted in the synmagmaticbrittleductile shear zone around Fe-rich picrite -Fe-rich andesite, Ti-Fe-rich gabbro-Ti-Fe-rich diorite, and monzonite-iverniteintrusive body. All of these lithofacies are supposed to be ore-hosted lithofacies for ironoxide copper gold deposits (IOCG). In general, vertical zonation of altered lithofacies are as follows: The top altered lithofacies is calyization-sericitization-hematitization zone, and the middle altered lithofacies is potassic alteration lithofacies with tourmalinization and Fe-rich alteration lithofacies +breccia lithofacies of hydrothermal fluid, while the low sodic alteration lithofacies with Ferich alteration lithofacies+breccia lithofacies of hydrothermal fluid. However, tourmalinization lithofacies may be the center of pneumatolytic hydrothermal fluid around the tongueshaped intrusion of ivernite and monzodiorite. Largesuperlarge iron-oxide copper gold deposits (IOCG) are of multistage alteration lithofacies system superimposed by breccia lithofacies of hydrothermal fluid in different origins. Multistage of alteration lithofacies superimposed by heterochronousheterochemical potential lithofacies at the same place and excellent altered lithofacies of pneumatolytic hydrothermal fluid are exploration and predictionindicators for Large-superlarge ironoxide copper gold deposits.

Key words: Geochemical lithofacies, Lithofacies system of alkaline alteration, Lithofacies system of acdic alteration, Breccia lithofacies of hydrothermal fluid, Alteration zonation.

中图分类号:

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