| 张龙升.苏丹东北部哈维特金矿地质特征及控矿构造研究[J].地质与勘探,2022,58(1):207-216 |
| 苏丹东北部哈维特金矿地质特征及控矿构造研究 |
| Geological characteristics and ore-controlling structures of the Haweit gold deposit，NE Sudan |
| 投稿时间：2020-09-04 修订日期：2020-12-10 |
| DOI：10.12134/j.dzykt.2022.01.020 |
| 中文关键词: 地质特征 剪切带构造 造山型 哈维特金矿 苏丹 |
| 英文关键词: geological characteristics, shear zone, orogenic gold deposit, Haweit deposit, NE Sudan |
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| 中文摘要: |
| 哈维特金矿床位于阿拉伯-努比亚地盾Gabgaba地块，是苏丹东北部近年来新发现的一个金矿床。通过系统的野外地质调查和控矿构造研究，初步揭示了该矿床的地质特征及矿床类型，基本查明了矿区的构造特点及其含矿性，为矿区进一步勘查指明了方向。矿区金矿（化）体，呈脉状，严格受NW向脆-韧性剪切带控制，产于低绿片岩相的片理化带内，主要以含金硅化碳酸盐化黄铁矿化绢英岩或碎裂岩的形式产出。硅化、黄铁矿化、碳酸盐化和绢云母化与金成矿关系密切。就矿床成因类型而言，应属于造山型金矿床。综合分析矿区构造特征发现，矿区脆-韧性剪切带具左行特征，其内广泛发育NW、NE、NEE、NNW、NNE向断裂构造；NW向左行左列断裂、NE向右行左列断裂和NEE向右行断裂是本区最主要的含矿构造，而NNW、NNE向断裂多为成矿期后的断裂构造；矿区构造形成演化过程中，先后经历了挤压变形、后挤压和伸展作用三个阶段，金成矿作用主要形成于后挤压作用阶段。矿区今后勘查找矿工作应重点针对NW向、NE向断裂构造控制的金矿体展开。 |
| 英文摘要: |
| The Haweit gold deposit, situated in the Gabgaba terrain of the Arabian-Nubian Shield, is newly discovered in northeastern Sudan in recent years. Through systematic flied investigation and ore-controlling structural analysis, this work discussed the geological characteristics of orebodies, the gold deposit type and the characteristics of structures in the Haweit gold deposit, in an attempt to provide basis for further exploration. The gold orebodies (mineralization) display vein type, and show a significant control by NW-trending brittle-ductile shear zone. They are hosted in low greenschist facies schistositized zone, and occur in gold-bearing silicified pyritized sericitolite with carbonation or cataclasite. Silicification, pyritization, carbonation and sericitization are closely related to gold mineralization. The Haweit gold deposit is inferred to be an orogenic gold deposit. Comprehensive analysis of the structural characteristics in the deposit suggests that, the brittle-ductile shear zone is featured by sinistral movement, with well-developed NW-, NE-, NEE-, NNW- and NNE-trending faults. The NW-trending, NE-trending and NEE-trending faults are the most important ore-controlling structures, and the NNW- and NNE-trending faults tend to be formed after the major gold mineralization period. During the formation of structures, the deposit was subjected to compressional deformation, post-compression and extension, and the gold mineralization was dominant in the post-compressional stage. The next exploration should focus on these gold orebodies controlled by the NW-trending and NE-trending fault structures. |
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