云南东川白锡腊碱性钛铁质辉长岩类岩株与侵入构造控矿特征  

Intrusive Structures of the Baixila Alkaline Ti-Fe-rich Gabbroic Stock and Their Controls on Orebody Distribution in Dongchuan, Yunnan

作　　者：王同荣[1,2,3] 方维萱[1,2,3] 郭玉乾[2,3] 杜玉龙[2,3] 宋丽红[2] 

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]北京矿产地质研究院,北京100012 [3]昆明中色地科矿产勘查有限责任公司,云南昆明650224

出　　处：《大地构造与成矿学》2014年第4期833-847,共15页Geotectonica et Metallogenia

基　　金：科技部科技支撑计划项目"东川–易门铜矿山深部及外围勘查技术及示范研究"(编号:2006BAB01B09);科技部转制科研院技术开发专项"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);昆明中色地科矿产勘查有限责任公司研发项目(编号:KZSDK-2008-1)联合资助

摘　　要：白锡腊矿段深部铁铜矿体属于与碱性钛铁质辉长岩侵入体有关的铁氧化物铜金型(IOCG)矿床。采用井巷工程构造岩相学填图技术,对云南东川白锡腊碱性钛铁质辉长岩类侵入体的侵入构造系统和控矿规律进行研究,认为滥泥坪-白锡腊铁铜矿段深部IOCG矿体产于碱性钛铁质辉长岩类侵入体的边缘,古火山机构、碱性钛铁质辉长岩侵入体、隐爆角砾岩体、多期叠加断裂构造和裂隙破碎带等是白锡腊IOCG矿床的控制构造组合样式。在辉长岩类侵入体中发育的脆韧性剪切带、热液角砾岩带和断裂-裂隙带等构造岩相学部位,构造-热流体耦合和水岩反应强烈,形成了蚀变构造岩相带。IOCG矿体的储矿构造类型为辉长岩类侵入体的膨大与转折部位的底部和产状变化部位、隐爆角砾岩和构造裂隙破碎带等。辉长岩侵入体的过渡相、含矿隐爆角砾岩相和蚀变构造岩相带等,它们是隐伏IOCG矿床的直接找矿预测标志。预测在白锡腊矿段深部和白锡腊-哑巴峡倒转背斜-断裂破碎带北翼深部具较大找矿前景,是寻找大型IOCG矿床有望靶区。The Baixilairon oxide copper-gold deposit is an IOCG-type deposit which is closely related to the alkaline Ti-Fe-rich diorite-gabbro intrusions. Using the tectonic lithofacies mapping methods, the characteristics of alkaline Ti-Fe-rich gabbro stock and its intrusive structure system for the ore-controlling patterns were studied in the Baixila area. It may be supposed that the IOCG-type orebody was located nearby the alkaline Ti-Fe-rich gabbro intrusions including the stock, apophyse and dykes, paleo-volcanic tectonics, cryptoexplosive breccias, and system of fault-fracture zone structure with multiperiod-superimposition. First, all of them are the ore-hosting structure patterns of the IOCG-type orebody. Secondly, the deep iron-copper orebody belongs to iron oxide copper-gold （IOCG） typewhich may be related to the alkaline dyke （apophyse） in the Baixila ore district. Finally, the locations of structure-hydrothermal fluid coupling with extensive fluid-rock reaction, resulting ore-bearing altered tectonic lithofacies zone, might be the brittle-ductile shear zone of thealkaline Ti-Fe-rich gabbro intrusions, hydrothermal breccia, and fault-fracture zone. The ore-hosted structure patterns of the IOCG-type orebody consist of the expansion of the alkaline Ti-Fe-rich gabbro intrusions, bottoms of the strolling part of the alkaline Ti-Fe-rich gabbro intrusions, the attitudes transformation part of the alkaline Ti-Fe-rich gabbro intrusions, crypto-explosive breccias, and fault-fracture zone. Therefore, the signs of direct prediction for the IOCG deposits are the transient phase of the alkaline Ti-Fe-rich gabbro intrusions, the ore-bearing altered tectonic lithofacies zone and the lithofacies of ore-bearing crypto-explosive breccias enclosed the alkaline Ti-Fe-rich gabbro intrusions. It may be predicated that there is a large-size IOCG deposit at the depth of the Baixila area. There are two pinpoint targets in the Baixila area, one target is at the depth of Baixila ore district to Zhonglaolong ore district, and anot

关 键 词：云南 滥泥坪 碱性钛铁质辉长岩 侵入构造 控矿构造 

分 类 号：P613[天文地球—矿床学]