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| 泰国湾第四纪准层序建造及气候控制的旋回性 | |
| 引用本文： | 冯志强,T.Astin,P.W.M.Corbett,R.Westerman.泰国湾第四纪准层序建造及气候控制的旋回性[J].地学前缘,2008,15(2):20-25. |
| 作者姓名： | 冯志强 T.Astin P.W.M.Corbett R.Westerman |
| 作者单位： | 1. 英国雷丁大学,沉积学研究生院,雷丁,RG66AB;大庆油田有限责任公司,黑龙江,大庆,163453 2. 英国雷丁大学,沉积学研究生院,雷丁,RG66AB 3. 英国赫瑞·瓦特大学,石油工程系,爱丁堡,EH144As |
| 基金项目： | 国家重点基础研究发展计划(973计划) |
| 摘 要： | 泰国湾第四系显示出很好的旋回性。通过高分辨率二维地震(布玛)剖面图及工程钻井资料,共识别出8个准层序。在典型准层序中,沉积物自下而上,从海相泥沉积逐渐过渡为泛滥平原沉积。在每个准层序顶部都发育下切河体系及古土壤层,说明在每个准层序形成之后,都曾暴露过地表并遭受到侵蚀。每个准层序都代表一个海进和海退的过程。这些准层序的厚度为6～22m不等,平均厚度13m左右。通过与第四纪氧同位素曲线对比得出,这8个旋回的形成年代可追溯到距今730～10ka,平均91ka为一个循环周期,表明这些旋回应该是由气候因素所驱使的海平面升降导致的。该频率的气候变化周期相当于Milankovitch旋回中地球围绕太阳运动椭球体偏心率的变化周期,因此,在更早的地质历史时期中,类似的旋回也应该存在,并具有全球可对比性。 |
| 关 键 词： | 泰国湾 第四系 准层序建造 气候旋回 |
| 文章编号： | 1005-2321(2008)02-0020-06 |
| 修稿时间： | 2007年10月29 |
Climatically-driven cyclicity in the Quaternary of the Gulf of Thailand |
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| Feng Zhiqiang,T.Astin,P.W.M.Corbett,R.Westerman.Climatically-driven cyclicity in the Quaternary of the Gulf of Thailand[J].Earth Science Frontiers,2008,15(2):20-25. | |
| Authors: | Feng Zhiqiang TAstin PWMCorbett RWesterman |
| Abstract: | The Quaternary in the Gulf of Thailand shows well-developed cyclicity.Eight parasequences have been identified by using high resolution 2D seismic(Boomer) profiles and engineering boreholes.Sediments change from marine mud to floodplain deposits from the bottom to the top of a typical parasequence.Incised fluvial systems and soil crust developed on top of each parasequence,which may indicate a significant subaerial exposure period after construction of each parasequence.Each parasequence represents a cycle of marine transgression and regression.The thickness of these parasequences varies from 6 to 22 m,with an average about 13 m.By correlating to the Quaternary oxygen isotope curve,the eight cycles are dated 730 to 10 ka,with an average 91 ka of periodicity,which suggests that these cycles should be caused by climate driven sea level oscillations controlled by eccentricity cycles discovered by Milankovitch.These kinds of cycles should exist in earlier geological history and should have global impact. |
| Keywords: | the Gulf of Thailand Quaternary parasequence construction climatically-driven cyclicity |
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