| 华南五峰组-龙马溪组黑色岩系时空展布的主控因素及其启示 |
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| 引用本文： | 苏文博,李志明,王巍,马超,李录,张磊,赵慧静.华南五峰组-龙马溪组黑色岩系时空展布的主控因素及其启示[J].地球科学,2007,32(6):819-827. |
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| 作者姓名： | 苏文博 李志明 王巍 马超 李录 张磊 赵慧静 |
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| 作者单位： | [1]中国地质大学地球科学与资源学院,北京100083 [2]中国地质大学地球科学学院,湖北武汉430074 [3]Dept of Earth ＆ Environ Sciences University of Kentucky Lexington KY 40506-0053,USA [4]Dept of Geosciences Williams College Williamstown MA01267,USA [5]Dept of Geology University of Cincinnati Cincinnat OH 45221-0013,USA |
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| 基金项目： | 国家自然科学基金
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中国石油化工股份有限公司海相油气勘探前瞻性项目 |
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| 摘 要： | 在回顾五峰组-龙马溪组两个地层单位沿革并重申其定义与划分基础上,重建了华南五峰组-龙马溪组及其相关地层序列的区域地层框架.根据这一框架中奥陶-志留纪黑色笔石岩系的穿时性、以及相关地层序列纵向演化特征与岩石圈板块挠曲模式的联系,结合所发现钾质斑脱岩源岩的板块汇聚背景,以及该阶段海平面升降与黑色岩系对应关系,提出控制该阶段华南黑色岩系的时空展布格局的主要因素有两个,即该阶段自南东向北西的华夏地块与扬子地块幕式汇聚过程所产生的岩石圈板块挠曲-周缘前陆盆地的同向迁移,以及该阶段两次全球性的三级海平面变化快速上升阶段所导致的缺氧及欠补偿水体.本文认为,要在华南奥陶-志留纪(包括其他断代)寻找其他可能的烃源岩层位,可能要首先考虑类似背景下这两种因素综合作用所导致的快速沉降及深水缺氧的沉积环境.
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| 关 键 词： | 奥陶-志留纪烃源岩 黑色页岩 岩石圈挠曲 全球海平面变化 华南板块汇聚 |
| 文章编号： | 1000-2383（2007）06-0819-09 |
| 修稿时间： | 2007-08-25 |
Distribution of Black Shale in the Wufeng-Longmaxi Formations(Ordovician-Silurian),South China: Major Controlling Factors and Implications |
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| Frank R.Ettensohn,Markes E.Johnson,Warren D.Huff,SU Wen-bo,LI Zhi-ming,Frank R.Ettensohn,Markes E.Johnson,Warren D.Huff,WANG Wei,MA Chao,LI Lu,ZHANG Lei,ZHAO Hui-jing.Distribution of Black Shale in the Wufeng-Longmaxi Formations(Ordovician-Silurian),South China: Major Controlling Factors and Implications[J].Earth Science-Journal of China University of Geosciences,2007,32(6):819-827. |
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| Authors: | Frank REttensohn Markes EJohnson Warren DHuff SU Wen-bo LI Zhi-ming Frank REttensohn Markes EJohnson Warren DHuff WANG Wei MA Chao LI Lu ZHANG Lei ZHAO Hui-jing |
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| Abstract: | Review of lithostratigraphic criteria for subdividing the Wufeng (Ordovician) and Longmaxi (Silurian) formations reaffirms their integrity and subdivisions and provides new regional correlations between the formations and related stratigraphic successions and facies. Both the black shales and the related overlying flysch deposits and other successions at the Ordovician-Silurian transition in South China appear to have migrated northwestward in time and space, reflecting probable flexural control in a foreland basin that developed in response to subduction-type orogeny southeast of the Yangtze block. The black shales also contain K-bentonites from explosive, felsic-intermediate volcanism, the distribution of which also supports orogeny to the southeast. Finally, analysis of sequence stratigraphy, which shows that the initiation of transgressive system tracts (TST) and condensed section (cs) in the related 3rd-order sequences coincided with the two black-shale horizons respectively, indicates that the major controlling factors for the deposition of the Ordovician-Silurian black shales in South China are (1) northwestwardly migrating, foreland-basin subsidence caused by deformational loading related to episodic accretion of the Cathaysia block to the Yangtze block during this period, and (2) the anoxic, sediment-starved water column caused by rapid rise of the sea level during the two successive phases of the 3rd-order, eustatic, sea-level rise near the Ordovician-Silurian transition in South China. In the future exploration for source rocks from the area in various periods, consideration of likely flexural and eustatic causes for subsiding, deep, anoxic seas may be important in recognizing other source-rock intervals. |
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| Keywords: | Ordovician-Silurian source rocks black shale lithospheric flexure eustasy plate accretion in South China |
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