Study of Ocean Floor Structure and Evolution by Drilling

通过钻探研究洋底结构及演化

• 批准号: 06044051
• 负责人: SUYEHIRO Kiyoshi
• 金额: $ 20.86万
• 依托单位: Ocean Research Institute, Univ.of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06044051/
• 关键词: Carbonate Platform; Sequence Stratrgraphy; Sea Level Change; Climatic Change; Heinrich Event; Hydrothermal Ore; Accretionary Prism; Subduction Erosion; 深海掘削; 地層の形成; ガスハイドレート; 大陸分裂; 北大西洋深海水; ドリフト堆積物; 有機質泥岩; 海洋循環; 大陸衝突; ブレーク海嶺; 天然ガス資源; 海底

The purpose of this research project is to investigate the history of Earth's environmental changes and geodynamics of the Earth interior through ocean drilling. This year, the following four main themes were investigated.1) Study of sea level changes and carbonate platform sequence stratigraphy based on the drilling in the Bahama bank. The study showed that progradation, agradation and hiatus formation were closely related to sea level changes and verified the use of sequence stratigraphy in this kind of setting.2) Investigation of the records and causes of rapid climatic and paleoceanographic changes recorded in the high-resolution core samples of the California margin and Sanich Inlet. The results showed that both rapid cooling and warming events were recorded in these cores suggesting that similar rapid events revealed by ice cores and hig latidude ocean such as Heinrich Event are in global scale nature.3) Study of hydrothermal system and ore deposits in the Juan de Fuca Ridge and its sedimented part based on a long-term borehole observatory (CORK). The area of hydrothermal fluid discharge and recharge was specified and the magnitude of circulation cell was determined. This result contributed significantly to the simulation of the hydrothermal system.4) Study of plate subduction, accretionary prism hydrogeology, tectonic erosion in the Barbados and Costa Rica margins. The CORK experiment and logging while drilling was found to be extremely useful for the study of fluid flow and physical properties of the subduction complex. The Costa Rica margin turned out to be a boundary which is dominated by large-scale subduction erosion, not by sediment underplating which was preferred interpretation before drilling.

该研究项目的目的是通过海洋钻探调查地球环境变化的历史和地球内部的地球动力学。本年度主要研究了以下四个主题：1）以巴哈马海岸钻井为基础的海平面变化和碳酸盐岩台地层序地层学研究。研究表明，海侵、加积和间断的形成与海平面变化密切相关，并验证了层序地层学在这类背景下的应用。2）探讨了加州边缘和Sanich湾高分辨率岩心中记录的气候和古海洋快速变化的记录及其原因。结果表明，在这些冰芯中记录到了快速变冷和变暖事件，表明类似于Heinrich事件的冰芯和高纬度海洋所揭示的快速变冷和变暖事件具有全球尺度的性质。3）基于长期钻孔观测（CORK）的Juan de Fuca海岭及其沉积部分热液系统和矿床研究。确定了热液的排泄和补给区域，确定了循环单元的大小。4）巴巴多斯和哥斯达黎加边缘板块俯冲、增生棱柱体水文地质、构造侵蚀研究。CORK实验和随钻测井被认为是非常有用的流体流动和俯冲复合体的物理性质的研究。哥斯达黎加边缘原来是一个边界，这是占主导地位的大规模俯冲侵蚀，而不是沉积物底侵，这是钻井前的首选解释。

项目成果

多田隆治: "我が国における石油根源岩堆積環境の再検討" 石油技術協会誌. 60. 5-14 (1995)

Ryuji Tada：“重新审视日本石油源岩的沉积环境”日本石油技术协会杂志 60. 5-14 (1995)。

Fujimoto,Hiromi and Nakakuki,T.: "Stress field in slabs penetrating into the lower mantle,and rheology and composition of the lower mantle." Proc.Japan Aced.70,Ser.B,No.2. 19-24 (1994)

Fujimoto，Hiromi 和 Nakakuki，T.：“穿透下地幔的板片中的应力场，以及下地幔的流变性和成分。”

多田隆治・入野智久: "第四紀後期における日本海の海洋環境変化" 月刊地球. 16. 667-677 (1994)

多田龙二和入野智久：“第四纪晚期日本海海洋环境的变化”地球月刊16。667-677（1994）。

多田隆治:Tada,R.Irino,T.,and Koizumi,I.: "Possible Dansgaard-Oeschger Oscillation signal recorded in the Japan Sea sediments." Proceedings of 1994 IGCP Symposium at Sapporo. (印刷中). (1995)

Tada, R. Irino, T. 和 Koizumi, I.：“日本海沉积物中记录的可能的 Dansgaard-Oeschger 振荡信号。”1994 年札幌 IGCP 研讨会论文集（1995 年）。

平朝彦、徳山英一、末広潔、高橋成実、清川昌一、森田澄人、斉藤実篤、青池寛: "大陸地殻はどのようにしてできたか。" 月刊地球. 号外No.16. 88-92 (1996)

Asahiko Taira、Eiichi Tokuyama、Kiyoshi Suehiro、Narumi Takahashi、Shoichi Kiyokawa、Sumito Morita、Saneatsu Saito、Hiroshi Aoike：“大陆地壳是如何形成的？”月刊特刊第 16 期。88-92（1996 年）