太平洋洋底高原和海山成因——重点以Shatsky海隆成因为例

庞洁红; 李三忠; 戴黎明; 吴婷婷; 索艳慧; IODP 324航次科学团队

doi:10.3724/SP.J.1140.2011.02001

太平洋洋底高原和海山成因——重点以Shatsky海隆成因为例

1 海底科学与探测技术教育部重点实验室, 青岛 266100;
2 中国海洋大学海洋地球科学学院, 青岛 266100;
3 Integrated Ocean Drilling Program Management International, Inc., USA

基金项目:

中国大洋钻探项目(IODP-China)

国家"863"重点项目(2009AA090300)

详细信息

作者简介:
庞洁红(1986-),女,硕士生,从事西北太平洋洋底高原和海山构造成因研究,E-mail:pangjiehong123@163.com

中图分类号: P736.1
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出版历程
- 收稿日期: 2010-08-10
- 修回日期: 2010-12-14

GENESIS OF OCEANIC PLATEAUS AND SEAMOUNTS IN THE PACIFIC OCEAN——A CASE STUDY OF SHATSKY RISE

1 Key Lab of Submarine Geosciences and Prospecting Technique, Ministry of Education, Qingdao 266100;
2 College of Marine Geoscience, Ocean University of China, Qingdao 266100;
3 Integrated Ocean Drilling Program Management International, Inc., USA

摘要

摘要: 太平洋洋底虽然有大规模的洋底高原和大量大大小小的海山,但西北太平洋的Shatsky海隆不管在构造位置上,还是在理解洋底高原成因所特有的重要证据上,都是独一无二的,对研究太平洋各隆起形成的机制有重要参考价值。目前,对Shatsky海隆的形成有3种主要假说:(1)地幔柱头假说;(2)洋中脊假说;(3)陨星撞击假说。这些假说都需要大规模的、始于地球深处的热异常,把地幔深部物质运送到板块底部。其中(1)、(2)假说中,依泽奈崎、法拉隆和太平洋板块形成的RRR三节点是关键。西北太平洋海隆的形成与板块运动速度改变、洋中脊/三节点跃迁重组有关。对于Shatsky海隆来说,哪种假说更适合解释其形成?通过综合磁条带、钻孔岩心等地球物理和地球化学方面的已有数据,以及IODP324航次FMS测井得到的节理及火成岩接触的倾向玫瑰花图,从构造角度分析了其形成历史时期内发生的构造过程和机制。认为组成Shatsky海隆的三大地块中,Tamu和Shirshov地块是由三节点跃迁过程中洋中脊之间相互作用形成,Ori地块很可能是地幔柱成因,但不排除洋中脊和地幔柱相互作用的过程。
- 海隆成因 /
- 地幔柱头 /
- 三节点 /
- 洋中脊 /
- Shatsky海隆
Abstract: Although there are many large oceanic plateaus and seamounts in the northwest Pacific,the Shatsky Rise is a unique one,due to not only its tectonic location,but also the significance for understanding the genesis of oceanic plateaus in the region.It is also important to the study of the mechanism of origin of other rises in the northwest Pacific.There are three hypotheses proposed for the formation of the Shatsky Rise:(1) plume-head hypothesis,(2) ocean ridge tectonic hypothesis,and (3) meteorite impact hypothesis.All these hypotheses need a large-scale thermal anomaly from the deep,and a vehicle for transportation of the lower plume material to the base of plate.To the hypotheses of (1) and (2),a RRR triple junction separating the Izanagi,Farallon,and Pacific plates is a key.The formation of the northwest Pacific rises is related to the changes in the speed of plate movement and the jump and reorganization of the ridge/triple junction.This paper illustrates the possible tectonic events and mechanism during the period while the Shatsky Rise formed according to pre-existing geophysical and geochemical data,such as magnetic lineation,drilling cores,and the rose digrams of dip direction of joints and contacts of igneous rocks from FMS logging during the IODP324 cruise.It is suggested that the Tamu and Shirshov massifs are consistent with the seafloor spreading theory while the Ori massif is formed by aplume-head,but the possibility of ridge-plume interaction is not excluded.
- genesis of oceanic plateau /
- mantle plume head /
- triple junction /
- oceanic ridge /
- the Shatsky Rise

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