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자료유형
학술저널
저자정보
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.19 No.1
발행연도
2015.1
수록면
69 - 80 (12page)

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The Shulu Sag is a typical rift valley basin in easternChina, where the formation mechanism of Cenozoic salt-bearingseries has been poorly understood. In this paper, petrologic analysis,X-ray powder Diffraction (XRD) analysis and the analysis ofhalite ion concentrations of the first member of the Shahejie Formationfrom two drilling cores were conducted to interpret theformation mechanism of these salt-bearing series in Shulu Sag. Theresults indicated that the salt-bearing series is mainly composed of calcilutiteor mudstone at top and bottom, and anhydrite-bearing haliteand thin interbeds of salt-bearing calcilutite and dark grey shale inthe middle part. These thin interbeds with porphyritic or petalshapedglauberite crystals or some thinner dark grey shale interbedsseparated halites into several members with the average thicknessof only 9~12 cm in the two drilling holes. This typical rhythmicpattern due to frequent alternation of concentration was evidencedby the variation of chemical composition and hydrogen isotopes ofhalite fluid inclusions. The presence of large number of primaryfluid inclusions within chevron crystals and vertically orientedbottom-growth crystals showed that the halite were precipitated inshallow water (<60 cm). These features are direct evidence for thisfrequent alternation of dissolution and concentration of brines andterrigenous detrital-chemical shallow-water sedimentary model ofthese small rift-valley basins in eastern China.

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