Carbonate mineral distribution and isotope-fractionation: An approach to depositional environment interpretation, Green River Formation, Wyoming, U.S.A.

Chemical Geology: Isotope Geoscience section Pub Date : 1992-09-25 DOI:10.1016/0009-2541(92)90010-3

Glenn M. Mason , Ronald C. Surdam

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引用次数: 16

Abstract

Carbonate mineral phases were investigated with respect to distribution and isotopic composition from core holes in the Green River Formation, Wyoming, an ancient lake complex. Mineral distribution data suggest dolomite genesis on a carbonate mudflat surrounding a central lake facies with transportation and subsequent later alteration in the lacustrine facies. Calcite was the dominant carbonate mineral deposited in the lacustrine facies. Samples, investigated by stable isotopes, representing each member of the Green River Formation, displayed isotopic values for δ¹³C of from − 1.3 to + 7.5‰ and for δ¹⁸C of − 6.0 to −0.8‰. Isotopic values representing modern and paleolacustrine sequences were compared. δ¹³C-values in the Green River Formation sediments were below values that might be expected from sediments which formed in a stratified lake. Mineral distribution and stable isotope evaluations demonstrated evidence to support a playa-lake depositional environment.

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碳酸盐矿物分布与同位素分选:一种沉积环境解释方法，美国怀奥明绿河组，美国

研究了怀俄明州古湖杂岩绿河组岩心孔中碳酸盐矿物相的分布和同位素组成。矿物分布资料表明白云岩形成于围绕中心湖相的碳酸盐岩泥滩上，湖相经过搬运和后期蚀变。湖相碳酸盐矿物以方解石为主。用稳定同位素研究了绿河组各成员的δ13C和δ18C的同位素值分别为−1.3 ~ + 7.5‰和−6.0 ~−0.8‰。比较了代表现代和古湖相层序的同位素值。绿河组沉积物的δ 13c值低于层状湖泊沉积物的δ 13c值。矿物分布和稳定同位素评价证明了湖湖沉积环境。

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Chemical Geology: Isotope Geoscience section

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