非洲中南部碳酸岩型稀土矿床时空分布、资源潜力与勘查进展
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本文为中国地质调查局项目(编号DD20230125,DD20230572)资助的成果


Spatial- temporal distribution, resource potential and exploration progress of carbonatite- type rare earth deposits in central and southern Africa
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    摘要:

    作为内生稀土矿床最重要的成矿类型,非洲中南部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,本文对非洲中南部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。将碳酸岩型稀土矿床划分为4条成矿带:匹林斯堡- 帕拉博鲁瓦稀土元素成矿带,成矿时代主要集中于古元古代—中元古代;纳马夸兰- 布须曼兰- 瓦姆巴德稀土元素成矿带,成矿时代为40~80 Ma;纳米比亚- 安哥拉西缘稀土元素成矿带,成矿时代集中于550~750 Ma和125~135 Ma之间;东部非洲稀土元素成矿带可进一步划分为赞比西成矿亚带、坦桑尼亚- 刚果(金)- 布隆迪- 卢旺达- 乌干达(东非裂谷西支)成矿亚带和坦桑尼亚- 肯尼亚- 乌干达(东非裂谷东支)成矿亚带,赞比西成矿亚带成矿时代可划分660~690 Ma、520~550 Ma和110~135 Ma三期;坦桑尼亚- 刚果(金)- 布隆迪- 卢旺达- 乌干达(东非裂谷西支)成矿亚带成矿时代主要集中于900~1000 Ma、500~700 Ma和100~120 Ma三期;坦桑尼亚- 肯尼亚- 乌干达(东非裂谷东支)成矿亚带成矿时代主要集中于110~120 Ma和5~25 Ma两期。系统归纳总结了各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,对成矿带资源潜力及近年来的勘查进展进行了梳理与解剖。我国在非洲中南部开展稀土工作起步较晚,目前虽取得了一定进展,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 carbonatite type rare earth deposits in central and southern Africa have superior geological metallogenic conditions and prospecting 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. Carbonatite 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 40~80 Ma; west margin of Namibia- Angola belt, which the metallogenic epoch were mainly concentrated in the 550~750 Ma and 125~135 Ma; East African REE metallogenic belt could be further subdivided into three metallogenic sub- belts: Zambezi sub- belt, with metallogenic epoch divided into three phases: 660~690 Ma, 520~550 Ma, and 110~135 Ma; Tanzania- Democratic Republic of the Congo- Burundi- Rwanda- Uganda (the western branch of the East African Rift system) sub- belt, where mineralization mainly occurred in three phases: 900~1000 Ma, 500~700 Ma and 100~120 Ma. The Tanzania- Kenya- Uganda (eastern branch of the East African Rift) Sub- belt, with mineralization concentrated in two phases: 110~120 Ma and 5~25 Ma. 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. Although China has made some progress in rare earth exploration and development in central and southern Africa, its involvement began relatively late. To secure resource advantages, it is imperative to accelerate exploration and development activities in the region.

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唐文龙.2025.非洲中南部碳酸岩型稀土矿床时空分布、资源潜力与勘查进展[J].地质学报,99(4):1085-1108.
TANG Wenlong.2025. Spatial- temporal distribution, resource potential and exploration progress of carbonatite- type rare earth deposits in central and southern Africa[J]. Acta Geologica Sinica,99(4):1085-1108.

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  • 在线发布日期: 2025-04-27