Finding of the Dolostones with Special Carbon Isotopic Composition and Its Significance

ZHANG Xiao bao; WANG Zhi yong; XU Yong chang

According to publications, the δ¹³ C value of the dolostones mainly ranges from -5‰ to +5‰ in a geological history except the Precambrian and Tertiary. However, we obtained some data of the dolostones which are more enriched in ¹³ C than +5‰ when we researched the dolostones in the Upper Permian Lucaogou Formation. The δ ¹³ C value of the dolostones varies in the range from +7.3‰ to +17.9‰ with an average of +11.7‰(7) and that of the dolomites from +7.9‰ to +16.1‰, averag +11.6‰(5). Based on the data of regional geology, petrology, mineralogy of the Upper Lucaogou Formation, the carbon isotopic characteristics of CO ₂ from modern sedimentary sections in oceans and lakes and the simulation of bacterial process and carbonate minerals in ancient sedimentary sections we analyzed the distribution characteristics of the dolostones and considered that except higher buried rate of the global Permian living things and higher salinity of the researched area the anomally ¹³ C-enriched dolosdones are mainly due to the formation of ¹³C-depleted CH ₄ and ¹³ C-enriched CO ₂ed till now, but as one of possible sources of natural gas attention should be paid to it.

Finding of the Dolostones with Special Carbon Isotopic Composition and Its Significance

1 Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000;

2 Tuha Institute of Petroleum Exploration and Development, Hami Xinjiang 839009

Received Date: 2000-03-31

Publish Date: 2000-09-10

Key words:

Abstract: According to publications, the δ¹³ C value of the dolostones mainly ranges from -5‰ to +5‰ in a geological history except the Precambrian and Tertiary. However, we obtained some data of the dolostones which are more enriched in ¹³ C than +5‰ when we researched the dolostones in the Upper Permian Lucaogou Formation. The δ ¹³ C value of the dolostones varies in the range from +7.3‰ to +17.9‰ with an average of +11.7‰(7) and that of the dolomites from +7.9‰ to +16.1‰, averag +11.6‰(5). Based on the data of regional geology, petrology, mineralogy of the Upper Lucaogou Formation, the carbon isotopic characteristics of CO ₂ from modern sedimentary sections in oceans and lakes and the simulation of bacterial process and carbonate minerals in ancient sedimentary sections we analyzed the distribution characteristics of the dolostones and considered that except higher buried rate of the global Permian living things and higher salinity of the researched area the anomally ¹³ C-enriched dolosdones are mainly due to the formation of ¹³C-depleted CH ₄ and ¹³ C-enriched CO ₂ed till now, but as one of possible sources of natural gas attention should be paid to it.

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Reference (19)

[1]	Veizer J,Hefs J. The nature ofsecular trends insedimentary carbonate rocks[J] . Geochim Cosmochim Acta 1976,40:1387～1 395
[2]	Degens E T. Epstein S. Oxygen and Carbon isotope ratios in coexistingcalcites and dolomites from recent and ancient sediments[J] . Geochim.Cosmochim, Acta, 1964,28(1) :23～44
[3]	Schoelle R A. Arthur M A. Carbon isotope flutuations in Cretaceouspelagic limestones: potential stratigraphic and petroletnm explorationtool[J] . AAPG Bulletin, 1980,64(1): 67～87.
[4]	黄思静.上扬子二叠系－三叠系海相碳酸盐岩的碳同位素组成与生物绝灭事件[J] .地球化学,1994,23(1)：60～68
[5]	李玉成.华南晚二叠世碳酸盐岩碳同位素旋回对海平面变化的响应[J] .沉积学报,1998,16(3)：52～65
[6]	陈绵石.同位素地层学和地质事件[A] .见：于津生主编,中国同位素地球化学研究[C] .北京：科学出版社,1997.49～63
[7]	张晓宝.博格达山北麓中二叠统芦草沟组黑色页岩中白云岩夹层的成因探讨[J] .沉积学报,1993,11(2)：133～139
[8]	黄思静.碳酸盐实验研究方法[J] .矿物岩石,1990,10(2)：108～116。
[9]	Irwin H,Curtis C. Isotopic evidence for source of diagenetic carbonatesformed during burial of organic- rich sediments[J ] . Nature, 1977,269:209～213
[10]	Whiticar M J, Faber E, Schoell M. Biogenic methane formation in ma-rine and freshwater environments: CO2 reduction vs. acetate fermenta-tion-isotope evidence[J] . Geochimica et Cosmochimica Acta, 1986,50: 693～709
[11]	Nissenbaum A, Presley B J,Kaplan I R. Early diagenesis in a reducingfjord,Saanich Inlet, B. C., I Chemical and isotopic changes in majorcomponents of interstitial water [J] . Geochimca. Comochim. Acta1972,36:1007～1027
[12]	Friedmann I, Hardcastle K. Interstitial water studies, leg. 15 - Isotopiccomposition of water. In: Initial Reports Deep Sea Drilling project,Vol. 20 (eds. Heezen B. C. Macgregor I. D.), Washington U. S.Govt. Printing Office. 1973,901～903
[13]	Games L M, Hayes J M, Gunsalas R D. Methane producing bacteria:natural fractionations of the stable carbon isotopes [ J ] . Geochimca.Cosmochimca. Acta 1978, 42:129～1 297
[14]	William D R,Silverman S R. Carbon isotope fractionation in bacterialproduetion of methane[J] . Science, 1965,130:1658～1659.
[15]	刘传联.东营凹陷沙河街组湖相碳酸盐岩碳氧同位素组分及其湖泊学意义[J] .沉积学报,1998,16(3),103～114
[16]	任磊夫,关平.油气生成过程中微粒－质点矿物[M] .北京：地质出版社,1992.38～4l
[17]	谭健,康祺发.内陆湖泊相碳酸盐δ13C严重正异常成因模式[J] .石油大学学报,1997,2l(1)：15～17
[18]	Coleman M L,Curtis C D, Irwin H.,Burial rate:a key to source andreservoir potential[J] . world Oil, 1979,188.83
[19]	郑淑蕙,郑斯成,莫志超.稳定同位素地球化学分析[M] .北京：北京大学出版社,1986.21～39,68～80

Finding of the Dolostones with Special Carbon Isotopic Composition and Its Significance

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