中南部非洲碳酸岩型稀土矿床时空分布规律、资源潜力与勘查进展
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中国地质调查局天津地质调查中心

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中国地质调查局项目《南部非洲国际合作地质调查》(编号:DD20221801)和横向项目《南部非洲金铜等矿产资源选区》联合资助


Spatial-temporal distribution, resource potential and exploration progress of carbonatite-type rare earth deposits in central and southern AfricaTANG Wenlong1),2)
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Tianjin Center, China Geological Survey

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    摘要:

    作为内生稀土矿床最重要的成矿类型,中南部非洲碳酸岩型稀土矿床成矿地质条件优越,资源潜力巨大。结合火成碳酸岩时空展布特征,本文对中南部非洲碳酸岩型稀土矿床区域成矿规律、资源潜力及勘查进展进行了探讨与总结。将中南部非洲划分为4条碳酸岩型稀土成矿带:匹林斯堡-帕拉波瓦稀土元素成矿带,成矿时代主要集中于古元古代-中元古代;纳马夸兰-布什曼兰-瓦姆拜德稀土元素成矿带,成矿时代为80~40Ma;纳米比亚-安哥拉西缘稀土元素成矿带,可进一步划分为2类,一类受巴拉纳-伊滕德卡热点影响的碳酸岩型稀土矿床,成矿时代为140~125Ma,一类受达马拉造山作用控制的碳酸岩型稀土矿床,成矿时代集中于750~550Ma;东非裂谷系稀土元素成矿带,可进一步细分为东非裂谷系南段成矿亚带、东非裂谷系西支成矿亚带和东非裂谷系东支成矿亚带,东非裂谷系南段成矿亚带自津巴布韦布海拉至马拉维马隆贝地区,成矿时代主要集中于135~110Ma;东非裂谷系西支成矿亚带自马拉维奇帕拉,经坦桑尼亚恩格拉,向北延伸至乌干达阿尔伯特湖,成矿时代可划分为三期:1100~1000Ma、700~500Ma和120~100Ma;东非裂谷系东支成矿亚带自坦桑尼亚韦古山向北延伸至埃塞尔比亚阿法尔三角洲,成矿时代可以划分为2期,分别为120~110Ma和5~25Ma。对各条成矿带时空分布规律、典型矿床成矿地质背景、矿床特征、成矿条件等进行了系统的梳理与总结,对成矿带资源潜力及近年来的勘查进展进行了分析与解剖。我国在中南部非洲开展稀土工作起步较晚,目前虽取得了一定的进展,仍需加快步伐开展资源勘查开发活动。

    Abstract:

    As the most important metallogenic type of endogenetic rare earth deposits, the carbonate type rare earth deposits in central and southern Africa have superior geological metallogenic conditions and great resource potential. Combined with the spatio-temporal distribution characteristics of igneous carbonatite, this paper discussed and summarized the regional metallogenic regularity, resource potential and exploration progress of carbonatite-type rare earth deposits in central and southern Africa. Carbonate type rare earth deposits were divided into four metallogenic belts: Pilanesberg-Phalaborwa belt, which the metallogenic epoch were mainly concentrated in the Paleoproterozoic – Mesoproterozoic; Namaqualand-Bushmanland-Warmbad belt, which the metallogenic epoch were 40-80Ma; west margin of Namibia - Angola belt which could be further divided into two categories,one was the carbonate rare earth deposit influenced by the Parana- Etendeka hot spot, and the metallogenic age was 140~125Ma; the other was controlled by the Damara orogenesis, and the metallogenic age was 750~550Ma. The REE metallogenic belt of the East African Rift system could be further subdivided into three metallogenic subbelts: the southern part of the East African Rift system, the western branch of the East African Rift system and the eastern branch of the East African Rift system. The southern part of the East African Rift system subbelt ranged from Buhera, Zimbabwe to Malombe, Malawi, and the metallogenic age was mainly concentrated in 135-110Ma. The west branch of the East African Rift system subbelt extended from Chipala of Malawi through Ngualla of Tanzania, northward to Lake Albert, Uganda, whihch the metallogenic ages could be divided into three stages: 1100~1000Ma, 700~500Ma and 120~100Ma. The East branch of the East African Rift system subbelt extended fromWigu Hill in Tanzania northward to Afar triangle in Ethiopia, which the metallogenic age could be divided into two stages, 120~110Ma and 5~25Ma, respectively. The spatio-temporal distribution of each metallogenic belts, the metallogenic geological background of typical deposits, the characteristics of the deposits, and the metallogenic conditions were systematically summarized, and the resource potential of the metallogenic belt and the exploration progress in recent years were sorted and dissected. China's rare earth work in central and southern Africa started late. Although some progress has been made, it’s still necessary to accelerate the resource exploration and development activities.

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  • 收稿日期:2023-03-14
  • 最后修改日期:2023-07-21
  • 录用日期:2023-07-24
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