| 曹强,王晨昇,张紫程,秦秀峰.厄立特里亚Gogne矿区VMS型矿床地质特征及找矿前景分析[J].矿产勘查,2024,15(1):60-72 |
| 厄立特里亚Gogne矿区VMS型矿床地质特征及找矿前景分析 |
| Geological characteristics and prospecting prospect analysis of VMS-type deposits in Gogne mining area， Eritrea |
| 投稿时间：2022-04-28 修订日期：2022-06-26 |
| DOI：10.20008/j.kckc.202401006 |
| 中文关键词: VMS矿床 地球化学 地球物理 成矿模式 厄立特里亚 |
| 英文关键词: VMS deposit geochemistry geophysics metallogenic model Eritrea |
| 基金项目:本文受中国地质调查局项目“北部非洲大型铜金资源基地评价”（DD20190443）资助。 |
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| 中文摘要: |
| Gogne矿区位于厄立特里亚西南Bisha-Zara成矿带内，该成矿带已发现Bisha超大型VMS矿床及大型Zara金矿床。Gogne VMS矿床主要赋存于“双峰式”火山岩系中，形成于中酸性火山喷发及沉积期。火山沉积作用是矿床的首要控矿因素，具有明显喷流沉积特征。钻探取心硫化物矿石具他形晶粒结构，块状构造、稠密浸染状构造。热液蚀变与矿化关系密切，主要有硅化、钾长石化、碳酸盐化、黄铁绢英岩化，沿石英脉或构造裂隙可见闪锌矿化、黄铜矿化、孔雀石化、黄钾铁矾化等。矿体具典型的双层结构，上部为似层状、透镜状的块状硫化物矿体，下部为浸染状、细脉状—网脉状或含矿蚀变体。结合化探圈定的2个甲类异常，物探异常及VMS矿床低阻、中低磁特征圈定的4个较好异常区，对比Bisha矿区VMS矿床特征，综合分析Gogne矿区具有成为规模大、资源潜力高的VMS矿床富集区。 |
| 英文摘要: |
| The Gogne mining area is located on the Bisha-Zara metallogenic belt in southwest Eritrea， where the Bisha super-large VMS deposit and the large Zara gold deposit have been discovered. The Gogne VMS deposit is mainly hosted in the "bimodal" volcanic rock series， which was formed in the middle-acid volcanic eruption and deposition period. Volcanic sedimentation is the primary ore-controlling factor of the deposit， it has obvious jet characteristics of jet-flow deposition. The sulfide ore cored by drilling has a heteromorphic grain structure， massive structure， dense disseminated structure. Hydrothermal alteration is closely related to mineralization， mainly including silicification， potassium feldsparization， carbonatization， pyrite sericitization. Along the quartz veins or structural fissures， sphalerite mineralization， chalcopyrite， malachite， and jarotonization can be seen. The ore body has a typical double-layer structure， the upper part is a layered， lenticular massive sulfide ore body， and the lower part is disseminated， veinlet-reticulate or mineral-bearing alteration. Combined with two Class A anomalies delineated by geochemical exploration， geophysical anomalies and four good anomaly areas delineated by low resistance， medium and low magnetic characteristics of VMS deposit. Compared with the characteristics of VMS deposits in Bisha mining area， it is comprehensively analyzed that the Gogne mining area has become a large-scale and high resource potential VMS deposit enrichment area. |
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