GENESIS OF NODULAR LIMESTONE IN THE UPPER CAMBRIAN BAOSHAN FORMATION IN WESTERN YUNNAN PROVINCE

HAO Jia-xu; PENG Cheng-long; ZHANG Guo-xiang

2012 Vol. 18, No. 4

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HAO Jia-xu, PENG Cheng-long, ZHANG Guo-xiang. GENESIS OF NODULAR LIMESTONE IN THE UPPER CAMBRIAN BAOSHAN FORMATION IN WESTERN YUNNAN PROVINCE[J]. Journal of Geomechanics, 2012, 18(4): 410-417.

Citation:

HAO Jia-xu, PENG Cheng-long, ZHANG Guo-xiang. GENESIS OF NODULAR LIMESTONE IN THE UPPER CAMBRIAN BAOSHAN FORMATION IN WESTERN YUNNAN PROVINCE[J]. Journal of Geomechanics, 2012, 18(4): 410-417.

GENESIS OF NODULAR LIMESTONE IN THE UPPER CAMBRIAN BAOSHAN FORMATION IN WESTERN YUNNAN PROVINCE

Geological Surveying Academy of Guizhou Province, Guiyang 550005, China

Received Date: 31 July 2012

Publish Date: 25 December 2012

Abstract

Abstract

In this paper, the depositional environment and formation mechanism of the nodular limestone from the Under Cambrian Baoshan Formation in Shidian region, western Yunnan Province was discussed on the basis of mineral components, texture and structure of the node and matrix. Researches show that there are three origins of the nodular limestone in the study area. The first is that the semi-consolidate or weak-consolidate mud and carbonate sediment is altered into the nodular structure by the differential compaction and pressure solution, and the occurrence mode of the nodular limestone is determined by the content of compositions of rock and the pressure solution intensity. The second is that the semi-consolidate or weak-consolidate mud and carbonate sediment is altered into the shoestring and rudaceous nodular limestone by the slope slumping. The third is that the argillo calcareous sediment with exposure and cracking is cemented into the nodular limestone by sediment filling.
- nodular limestone /
- Baoshan Formation in Upper Cambrian /
- Late Pan-African movement /
- Shidian region /
- western Yunnan

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References

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