| 摘要: |
| 东北非是一个快速兴起的世界级金矿省，发育大量造山型金矿床。本文选择东北非努比亚地盾代表性造山型矿床进行总结梳理，认识到区内金矿成矿可能受控于努比亚地盾地块加积向拼合后张扭剪切转换的过程，绿片岩相-角闪岩相变质基性火山岩是主要赋矿围岩，剪切带（断层）是主要控矿构造。通过对比，发现努比亚地盾矿集区与胶东矿集区在大规模金成矿前均经历了洋壳俯冲过程，除赋矿围岩和成矿时代区别明显外，在控矿构造、矿化类型、矿物组合、成矿流体等方面较为相似。结合控矿因素与找矿标志对比，本文针对努比亚地盾造山型金矿的找矿勘查提出具体建议：遥感和地质图修编圈定找矿远景区；地球化学测量和地质图草测等圈定找矿靶区；蚀变填图、反循环钻探，结合电磁测量，追踪隐伏矿体；矿床理论研究和矿田构造分析，支撑矿床（点）深部找矿。 |
| 关键词: 东北非 努比亚地盾 造山型金矿 找矿勘查 |
| DOI： |
| 分类号: |
| 基金项目:中国地质调查局地质调查专项“北部非洲大型铜金资源基地评价”(DD20190443) |
|
| The Comparison of Orogenic Gold Deposits in Nubia Shield of Northeast Africa and in Jiaodong of China |
|
ZENG GUOPING, Xiang Wenshuai, WU FAFU, LI FULIN, WANG JIANXIONG, HU PENG
|
|
Wuhan Center, China Geological Survey (Central South China Innovation Center for Geosciences)
|
| Abstract: |
| The Nubian shield in the Northeast Africa is an emerging world-class gold province with numerous orogenic gold deposits. Based on some representative orogenic gold deposits, some basis geological features related to the orogenic gold deposits in the Nubian shield are summarized: gold mineralization in this area may be formed during the transformation from block accretion of the Nubian shield to a torsional shear after cohered, the metamorphic basic volcanic rocks of the greenschist-amphibolite facies are main host rock, and the shear zones (faults) are main ore-controlling structures. Then, the orogenic gold deposits of the Nubian shield are compared with similar deposits in China, which suggests that both regions undergone slab subduction before large-scale gold mineralization, and they are similar in ore-controlling structures, mineralization types, mineral assemblages, and ore-forming fluids, except for the obvious differences between host rocks and metallogenic ages. Combined with the comparison of ore-controlling factors and prospecting indicators, some detailed suggestions for the orogenic gold deposits exploration in Nubia Shield are proposed: (1) geochemical and geological brief survey to outline the prospecting target area; (2) alteration mapping, reverse circulation drilling, combined with electromagnetic measurement to track hidden ore bodies; (3) theoretical study and structural analysis to support deep ore-prospecting. |
| Key words: Northeast Africa Nubian Shield Orogenic gold deposits Mineral exploration |