SOURCE ROCK POTENTIAL OF SHALLOW-WATER EVAPORATES - AN INVESTIGATION IN HOLOCENE-PLEISTOCENE SALT FLAT SABKAH (PLAYA), WEST TEXAS NEW-MEXICO

被引：14

作者：

HUSSAIN, M

WARREN, JK

机构：

[1] Dpartment of Geology Sul Ross State University, Alpine, 79832, TX

[2] National Center for Petroleum Geology and Geophysics, Adelaide, 5001

来源：

CARBONATES AND EVAPORITES | 1991年 / 6卷 / 02期

关键词：

D O I：

10.1007/BF03174424

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Source rock potential of the shallow-water evaporite-carbonate sequences at Salt Flat sabkha (playa) was evaluated on the basis of total organic carbon TOC), extractable organic matter and Rock Eval pyrolysis. Sedimentological evidence indicates periodic anoxicity in the Salt Flat brine lake during evaporite deposition. This was caused during wetter intervals when inflowing runoff rested on denser brine, forming a halocline. Brine stratification inhibited free circulation of oxygen in the lake bottom, enhancing the preservation of organic matter. Organic matter in gypsum-rich horizons is dominantly of algal origin. Average organic carbon content of the sediments is 0.6% but may be 1.2% or more in gypsum-rich sediments. Hydrogen Index is generally high, ranging from a low of 300 mg HC g/C(org) for gypsum-rich beds.

引用

页码：217 / 224

页数：8

共 23 条

[1]

Bellanca A., Nerri R., Evaporite carbonate cycles of the Messinian, Sicily: stable isotopes, mineralogy, textural features, and environmental implications, Journal of Sedimentary Petrology, 56, pp. 614-621, (1986)

[2]

Borowitzka L.J., The microflora: adaptations to life in extremely saline lakes, Hydrobiologia, 81, pp. 33-46, (1981)

[3]

Clark R.C., Blumer M., Distribution of n-paraffins in marine organisms and sediment, Limnology and Oceanography, 12, pp. 79-87, (1969)

[4]

Eugster H.P., Hardie L.A., Sedimentation in an ancient playa-lake complex: the Wilkins Peak member of the Green River formation of Wyoming, Bulletin Geological Society of America, 86, pp. 319-334, (1975)

[5]

Friedman G.M., Occurrence and origin of Quaternary dolomite of Salt, Flat, west Texas, Journal of Sedimentary Research, 36, pp. 263-267, (1966)

[6]

Gehman H.M., Organic matter in limestone, Geochimica et Cosmochimica Acta, 26, pp. 886-896, (1962)

[7]

Hammer U.T., Primary production in saline lakes: a review, Hydrobiologia, 81, pp. 47-57, (1981)

[8]

Hedberg H.D., Geologic control of petroleum genesis, Proceedings 7th World Petroleum Congress, 2, pp. 3-11, (1967)

[9]

Hussain M., n-alkane in continental evaporitecarbonate sequences and its possible implications in paleoclimate study: a study in Salt Flat sabkha, west Texas-New Mexico, Bulletin of the Geological Society of America, Ahstracts with Program, 20, (1988)

[10]

Hussain M., Warren J.K., Dolomitization in sulfate-rich environment: a modern example from Salt Flat sabkha (dried playa lake) in west Texas-New Mexico, Carbonates and Evaporites, 3, pp. 473-480, (1988)

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