塔里木盆地寒武—奥陶纪海平面升降变化规律研究
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摘要
利用元素地球化学特征和地震几何构型特征,对塔里木盆地寒武-奥陶纪时期海平面升降变化规律进行了研究,建立了寒武-奥陶纪相对海平面变化曲线。研究发现,塔里木盆地寒武奥陶纪可划分出3个一级旋回,8个二级旋回,17个三级旋回和多期高频震荡旋回。其中,寒武纪经历了3期二级旋回,早中奥陶世经历了2期旋回。相对于寒武纪,早奥陶世海平面升幅较大。晚奥陶世经历了3期二级旋回:第一期处于海平面低位期,幅度较小;后二期快速上升,直达最高水位状态。海平面相对升降变化控制着盆地的沉积充填和层序的形成演化,其旋回性与盆地沉积作用的旋回性相一致,并可通过沉积相的演变表现出来。
The eustatic sea-level change rule has been studied by using element geochemistry feature and seismic geometric configuration feature in the Cambrian-Ordovician in Tarim Basin,and the comparative sea-level change curve has been obtained,which can be divided into three first-grade cycles,eight second-grade cycles,seventeen third-grade cycles and more high frequency concussion cycles in the Cambrian-Ordovician in Tarim Basin.There occurred the second-grade eustatic sea-level change cycle three times during Cambrian and two times during the early Ordovician,and the extent of the sea-level rise in the early Ordovician is higher than that in Cambrian.In the middle-late Ordovician there occurred the second-grade eustatic sea-level change cycle three times,and the first time occurred at low system tract of sea level with small rise extent of the sea-level,but the sea-level rapidly reached the highest water level state in the later two times.The eustatic sea-level change controls on the basin sediment infilling and sequence formation evolution.The cyclicity of the sea-level changes are corresponded with the cyclicity of the basin sedimentation,and are represented by the sedimentary facies evolutions.
The eustatic sea-level change rule has been studied by using element geochemistry feature and seismic geometric configuration feature in the Cambrian-Ordovician in Tarim Basin,and the comparative sea-level change curve has been obtained,which can be divided into three first-grade cycles,eight second-grade cycles,seventeen third-grade cycles and more high frequency concussion cycles in the Cambrian-Ordovician in Tarim Basin.There occurred the second-grade eustatic sea-level change cycle three times during Cambrian and two times during the early Ordovician,and the extent of the sea-level rise in the early Ordovician is higher than that in Cambrian.In the middle-late Ordovician there occurred the second-grade eustatic sea-level change cycle three times,and the first time occurred at low system tract of sea level with small rise extent of the sea-level,but the sea-level rapidly reached the highest water level state in the later two times.The eustatic sea-level change controls on the basin sediment infilling and sequence formation evolution.The cyclicity of the sea-level changes are corresponded with the cyclicity of the basin sedimentation,and are represented by the sedimentary facies evolutions.
引文
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[3]Miriam Cobianchi,Vincen Picotti.Sedimentary andbiological response to sea level and paleaoceanographicchanges of a Low Middle Jurassic Tethyan platformmargin(Southern Alps,Italy)[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2000,169:219244.
[4]鲍志东,朱井泉,汪茂生,等.海平面升降中的元素地球化学响应以塔中地区奥陶纪为例[J].沉积学报,1998,16(4):32 36.BAO Zhi-dong,ZHU Jing-quan,WANG Mao-sheng,et al.Isotope and trace element evolution:Respondingto sea-level fluctuation-An example of Ordovician inmiddle Tarim Basin[J].Acta Sedimentologica Sinica,1998,16(4):32 36.
[5]汪茂生,朱井泉,陈代钊,等.塔里木盆地奥陶纪碳酸盐岩碳、锶同位素特征及其对海平面变化的响应[J].中国科学(D辑),2002,32(1):36 42.WANG Mao-sheng,ZHU Jing-quan,CHEN Dai-zhao,et al.The feature of carbon,strontium isotopeand respond to sea-level change in carbonate rock inOrdovician in Tarim Basin[J].Science in China(SeriesD),2002,32(1):36 42.
[6]彭苏萍,何宏,邵龙义,等.塔里木盆地寒武奥陶纪碳酸盐岩碳同位素组成特征[J].中国矿业大学学报,2002,31(4):353 357.PENG Su-ping,HE Hong,SHAO Long-yi,et al.Carbon isotopic compositions of the Cambrian-Ordo-vician carbonates in Tarim Basin[J].Journal of ChinaUniversity of Mining and Technology,2002,31(4):353 357.
[7]威尔格斯C K.层序地层学原理(海平面变化综合分析)[M].徐怀大,译.北京:石油工业出版社,1985:195.Vails C K.The principle of sequence stratigraphy(in-tegrated analysis of sea level changes)[M].Translatedby Xu Huai-da.Beijing:Petroleum Industry Press,1985:1 95.
[8]Robert M Carter.Two model:global sea level changeand sequence stratigraphic architecture[J].Sedimenta-ry Geology,1997,122:23 36.
[9]李兴平,许国明,李静琏,等.新疆塔里木盆地层序地层格架[J].石油实验地质,1996,18(2):134 145.LI Xing-ping,XU Guo-ming,LI Jing-lian,et al.Se-quence stratigraphic framework of the Tarim Basin,Xinjiang[J].Petroleum Geology&Experiment,1996,18(2):134 145.
[10]郭建华.塔北隆起早奥陶世碳酸盐岩与海平面变化[J].新疆石油地质,1996,17(4):338 344.GUO Jian-hua.Carbonate sedimentary facies and sea-level change in early Ordovician in Tabei uplift[J].Xinjiang Petroleum Geology,1996,17(4):338 344.
[11]冯增昭,张家强,金振奎,等.中国西北地区奥陶纪岩相古地理[J].古地理学报,2000,2(3):1 14.FENG Zeng-zhao,ZHANG Jia-qiang,JIN Zhen-kui,et al.Lithofacies palaeogeography of the Ordovicianin Northwest China[J].Journal of Palaeogeography,2000,2(3):1 14.
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