Gongming Reservoir-Qinglinjing Reservoir Water Connection Project age attribution of carbonate strata

Abstract

The eastern section of the Gongming Reservoir-Qinglinjing Reservoir Connection Project is located in the west side of the Longgang Karst Basin in Shenzhen near the Dongguan boundary. Engineering investigation reveals 6 sections of carbonate rocks.The age of each section of carbonate rocks is controversial. In order to clarify the stratigraphic age of carbonate rocks and analyze the soluble characteristics of rock groups, it is necessary to study the stratigraphic age of each section of carbonate rocks. The technical path of "regional stratum-lithology combination-rock mineral composition and fossils" from macro to micro is adopted for comparative analysis and research. Firstly, the regional strata of the project area are studied, and the stratigraphic age of each section is preliminarily determined. Then, the lithological combination of carbonate rocks in each section is compared and analyzed to further clarify the stratigraphic age of carbonate rocks in each section. Finally, the rock mineral composition and biological fossils of each section are compared and reviewed. Through comprehensive research and analysis, the stratigraphic age of carbonate rocks in each section involved in the Gongming Reservoir-Qinglinjing Reservoir Connection Project was clarified.The determination of the stratigraphic age should be based on the study of regional geological data, The result show that the age of carbonate strata in Longgang karst basin of Shenzhen is complex, combined with the comprehensive comparison and analysis of the lithology revealed by the survey.

Keywords

carbonate rock strata / study on the age of strata / Gongming Reservoir-Qinglinjing Reservoir Connection Project