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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.1
- 수록면
- 407 - 422 (16page)
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초록· 키워드
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The Paleocene sedimentary sequence in the Jiangling Depression was deposited in a salt lake environment. Based on detailed core observation of four drillholes in the Jiangling Depression, a study of sedimentary characteristics of glauberite in Paleocene lacustrine deposits was conducted through thin section petrography, X-ray diffraction, scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). This study has revealed five types of geological occurrences and six types of profile distribution features of glauberite. On the basis of petrological and mineralogical characteristics, we propose that the glauberite is mainly formed by crystallization from saturated sulfate solution and by ion exchange between sulfate solution and calcium-bearing pore solution. Glauberite mainly occurs in the late stage of Paleocene, when brine is relatively highly concentrated. Replacement of gypsum by glauberite is subordinate. The depositional model of glauberite is also discussed. The sulphur isotopic values δ34S) and the strontium ratios (87Sr/86Sr) of the sulphate suggest a non-marine brine supply. The profile distribution features of glauberite contribute to a better understanding of the past climate change. The glauberite in Late Paleocene is frequently interbedded with dolomite, anhydrite, halite or thenardite, suggesting fluctuation of lake water salinity and climate. Trace element compositions of the mudstones imply the reducing condition and fluctuating salinity. The Homogenization temperatures and hydrogen and oxygen isotopic values (δDSMOW and δ18OSMOW) in halite and thenardite inclusions further indicate that in Paleocene the temperature was relatively high and fluctuant. Moreover, the palaeoclimate was drier in the late stage of Late Paleocene, though the temperature was cooler/lower.
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참고문헌 (58)
참고문헌 신청
Arakel, A.V. / 1991 / Deposition and early diagenesis of playa glauberite in the Karinga Creek drainage system, Northern Territory, Australia / Sedimentary Geology 70:41~59
Bukowski, K. / 2009 / Salt geology and mining traditions: Kalush and Stebnyk mines (Fore-Carpathian region, Ukraine) / Geoturystyka 3:27~34
Deng, H.W. / 1993 / Sedimentary Geochemistry and Environmental Analysis / Gansu Science and Technology Press :154
Dill, H. / 1988 / Petrography, inorganic and organic geochemistry of Lower Permian carbonaceous fan sequences ("Brand-schiefer Series") Federal Republic of Germany: constrains to their paleogeography and assessment of their source rock potential / Chemical Geology 67:307~325
Edinger, S.E. / 1973 / The growth of gypsum: an investigation of the factors which affect the size and growth rates of the habit faces of gypsum / Journal of Crystal Growth 18:217~224
Bukowski, K. / 2009 / Salt geology and mining traditions: Kalush and Stebnyk mines (Fore-Carpathian region, Ukraine) / Geoturystyka 3:27~34
Deng, H.W. / 1993 / Sedimentary Geochemistry and Environmental Analysis / Gansu Science and Technology Press :154
Dill, H. / 1988 / Petrography, inorganic and organic geochemistry of Lower Permian carbonaceous fan sequences ("Brand-schiefer Series") Federal Republic of Germany: constrains to their paleogeography and assessment of their source rock potential / Chemical Geology 67:307~325
Edinger, S.E. / 1973 / The growth of gypsum: an investigation of the factors which affect the size and growth rates of the habit faces of gypsum / Journal of Crystal Growth 18:217~224
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