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CHANG Hong-lun, KONG Fan-hui, SONG Xiao-dong, ZHAO Jin, LI Jian-feng, DU Jun, WANG Cong-ying. Dolostone Controls in Postmasburg Manganese Field, South Africa[J]. Acta Sedimentologica Sinica, 2014, 32(5): 832-839.
Citation: CHANG Hong-lun, KONG Fan-hui, SONG Xiao-dong, ZHAO Jin, LI Jian-feng, DU Jun, WANG Cong-ying. Dolostone Controls in Postmasburg Manganese Field, South Africa[J]. Acta Sedimentologica Sinica, 2014, 32(5): 832-839.

Dolostone Controls in Postmasburg Manganese Field, South Africa

  • Received Date: 2013-08-06
  • Rev Recd Date: 2013-11-13
  • Publish Date: 2014-10-10
  • Bishop and Paling mining areas are located in the western belt of Postmasburg Manganese Field, South Africa, in which typical metamorphosed sedimentary deposits developed. Six lithology units are identified for the lithology sequence, they are dolomite unit, iron-manganese mineralization unit, ferruginous fine sandstone/ferruginous conglomerate unit, pelitic siltstone unit, quartzite unit and shale unit from bottom to top, respectively, among which dolomite unit constitutes the base for ore body. There are two types of dolostone. They are Mn-rich dolostone and algal dolostone overlying, and both of them contribute to the karst system. Mass of sinkholes in the karst system provide the main space for the occurrence of depositional sequence. The morphology, size and locality of the original ore are restricted by the sinkholes, resulting in discontinuous lateral continuity. The wad is the weathering residue of the Mn-rich dolomite, and it is overlied unconformably by Mn-rich ores at bottom of the orebody, while the lateral part of the orebody is underlied directly by algal dolomite. Cummulate orebody excessively distributes at the edge of the dolomite slope. The whole development of the manganese field can be divided into three stages. The corroded depression in N-S direction formed during the first stage lays a foundation for the iron and manganese sediment. During the third stage, karstification happens again, resulting in side collapse of original ore, which accumulated on the slope, and finally the cumulate orebodies were formed.
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    [2] 董骁方. 南非矿产资源开发与利用[J]. 现代矿业, 2012(7):1-6[Dong Xiaofang. Exploration and utilization of mineral resources in South Africa[J]. Modern Mining, 2012(7): 1-6]
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  • Received:  2013-08-06
  • Revised:  2013-11-13
  • Published:  2014-10-10

Dolostone Controls in Postmasburg Manganese Field, South Africa

Abstract: Bishop and Paling mining areas are located in the western belt of Postmasburg Manganese Field, South Africa, in which typical metamorphosed sedimentary deposits developed. Six lithology units are identified for the lithology sequence, they are dolomite unit, iron-manganese mineralization unit, ferruginous fine sandstone/ferruginous conglomerate unit, pelitic siltstone unit, quartzite unit and shale unit from bottom to top, respectively, among which dolomite unit constitutes the base for ore body. There are two types of dolostone. They are Mn-rich dolostone and algal dolostone overlying, and both of them contribute to the karst system. Mass of sinkholes in the karst system provide the main space for the occurrence of depositional sequence. The morphology, size and locality of the original ore are restricted by the sinkholes, resulting in discontinuous lateral continuity. The wad is the weathering residue of the Mn-rich dolomite, and it is overlied unconformably by Mn-rich ores at bottom of the orebody, while the lateral part of the orebody is underlied directly by algal dolomite. Cummulate orebody excessively distributes at the edge of the dolomite slope. The whole development of the manganese field can be divided into three stages. The corroded depression in N-S direction formed during the first stage lays a foundation for the iron and manganese sediment. During the third stage, karstification happens again, resulting in side collapse of original ore, which accumulated on the slope, and finally the cumulate orebodies were formed.

CHANG Hong-lun, KONG Fan-hui, SONG Xiao-dong, ZHAO Jin, LI Jian-feng, DU Jun, WANG Cong-ying. Dolostone Controls in Postmasburg Manganese Field, South Africa[J]. Acta Sedimentologica Sinica, 2014, 32(5): 832-839.
Citation: CHANG Hong-lun, KONG Fan-hui, SONG Xiao-dong, ZHAO Jin, LI Jian-feng, DU Jun, WANG Cong-ying. Dolostone Controls in Postmasburg Manganese Field, South Africa[J]. Acta Sedimentologica Sinica, 2014, 32(5): 832-839.
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