古氧相分析在黄骅拗陷歧南次凹沙河街组沉积环境研究中的应用
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摘要
把古氧相分析理论与方法应用于黄骅拗陷歧南次凹古近系沙河街组沉积环境研究之中,通过古氧相分析中的微量元素V/Cr和Ni/Co分析,以及岩石与古生物分析表明,歧南次凹沙河街组具有以常氧为主、贫氧为辅的沉积环境;同时,古盐度分析指示为咸水、半咸水环境,地球物理学(地震、布格重力异常)研究结果为深水封闭湖泊环境,对比分析认为歧南次凹沙河街组为内陆深水咸化湖泊环境。在环境地质标志研究基础上进行沉积环境研究时,采用古氧相分析与古盐度分析等综合研究,可以有效避免将内陆咸化湖泊环境误判为海相或过渡相环境。
This paper introduces the application of the paleo-oxygen facies analysis to the study of the sedimentary environment in the Paleogene Shahejie Formation in the south Qikou sag.The trace elements(V/Cr,Ni/Co) analysis in the paleo-oxygen facies analysis shows the aerobic and dysaerobic environment in the Paleogene Shahejie Formation in the south Qikou sag.In the meantime,the paleosalinity(Sr/Ba and Ca/(Ca+Fe)) analysis indicates the salt and brackish water environment.The seismic and Bouguer gravity anomaly data show the abyssal and closed environment.The contrast of the paleo-oxygen facies,paleosalinity and geophysical analysis results shows the terrestrial abyssal and salty lacustrine facies of the Paleogene Shahejie Formation in the south Qikou sag.Finally,there is a suggestion that the comprehensive paleo-oxygen facies,paleosalinity and geophysical analysis can avoid taking terrestrial abyssal and salty lacustrine facies as the marine-continental transitional facies or marine facies.
This paper introduces the application of the paleo-oxygen facies analysis to the study of the sedimentary environment in the Paleogene Shahejie Formation in the south Qikou sag.The trace elements(V/Cr,Ni/Co) analysis in the paleo-oxygen facies analysis shows the aerobic and dysaerobic environment in the Paleogene Shahejie Formation in the south Qikou sag.In the meantime,the paleosalinity(Sr/Ba and Ca/(Ca+Fe)) analysis indicates the salt and brackish water environment.The seismic and Bouguer gravity anomaly data show the abyssal and closed environment.The contrast of the paleo-oxygen facies,paleosalinity and geophysical analysis results shows the terrestrial abyssal and salty lacustrine facies of the Paleogene Shahejie Formation in the south Qikou sag.Finally,there is a suggestion that the comprehensive paleo-oxygen facies,paleosalinity and geophysical analysis can avoid taking terrestrial abyssal and salty lacustrine facies as the marine-continental transitional facies or marine facies.
引文
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[14]Jones B J,Manning A C.Comparison of geochemi-cal indices used for the interpretation of palaeoredoxconditions in ancient mudstones[J].Chemical Geol-ogy,1994,111:111-129.
[2]孙镇城,杨藩张,枝焕,等.中国新生代咸化湖泊沉积环境与油气生成[M].北京:石油工业出版社,1997.
[3]Rhoads D C,Morse J W.Evolutionary and ecologicalsignificance of oxygen-deficent marine basins[J].Le-thaia,1971,4:413-428.
[4]Tyson R V,Pearson T H.Modern and ancient conti-nental shelf anoxia:an overview[C]//Modern andancient continental shelf anoxia.Geological SocietySpecial Publication,1991,58:1-24.
[5]颜佳新,张海清.古氧相——一个新的沉积学研究领域[J].地质科技情报,1996,15(3):7-13.
[6]颜佳新,陈北岳,李思田,等.鄂湘桂地区栖霞组古氧相分析与层序地层和海平面变化[J].地质论评,1997,43(2):193-199.
[7]颜佳新,徐四平,李方林.湖北巴东栖霞组缺氧沉积环境的地球化学特征[J].岩相古地理,1998,18(6):27-32.
[8]颜佳新.华南地区二叠纪栖霞组碳酸盐岩成因研究及其地质意义[J].沉积学报,2004,22(4):579-587.
[9]颜佳新,刘新宇.从地球生物学角度讨论华南中二叠世海相烃源岩缺氧沉积环境成因模式[J].地球科学:中国地质大学学报,2007,32(6):789-796.
[10]施春华,黄秋,颜佳新.广西来宾栖霞组缺氧沉积环境的地球化学特征[J].沉积与特提斯地质,2001,21(2):72-77.
[11]腾格尔,刘文汇,徐永昌,等.缺氧环境及地球化学判识标志的探讨——以鄂尔多斯盆地为例[J].沉积学报,2004,22(2):365-372.
[12]杜远生,龚一鸣,张哲,等.南华海泥盆纪烃源岩的古氧相和缺氧环境模式——以广西中、上泥盆统为例[J].古地理学报,2009,11(1):28-36.
[13]施春华,胡瑞忠,颜佳新.栖霞组沉积地球化学特征及其环境意义[J].矿物岩石地球化学通报,2004,23(2):144-148.
[14]Jones B J,Manning A C.Comparison of geochemi-cal indices used for the interpretation of palaeoredoxconditions in ancient mudstones[J].Chemical Geol-ogy,1994,111:111-129.
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