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Study of magma-starved extension in the southern Philippine Sea

菲律宾海南部岩浆匮乏延伸区的研究

基本信息

批准号：
16340127
负责人：
OKINO Kyoko
金额：
$ 10.43万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

The Parece Vela Basin is an extinct backarc basin in the Philippine Sea and has been know as a place where some oceanic core complexes (lower crust and upper mantle material exposure near/on the surface along a large detachment fault) develop. The basin is considered to have formed under magma-starved, tectonic dominant environment. One of the core complexes is the world-largest one and the spreading rate was relatively fast, so it is an important target to understand the magma-starved spreading and the development of detachment faults. The southern part of the basin has not been systematically surveyed and the extent of the core complex distribution and an initial evolutional history of the basin have remained unsolved. During this study, we conducted two geophysical and petrological survey cruises in 2005, and obtained the following results.1. Another large core complex was found between 13-14°N, where the gabrroic rocks were recovered. Other possible core complexes were also mapped, suggesting the basin-scale, magma-starved spreading occurred in the latest stage of the basin formation.2. Ultramylonite and mylonite were first reported on the core complex surfaces, suggesting the existence of large detachment fault developing from mantle lithosphere.3. The structure of the southern tip of the basin was first mapped and a model of early stage of basin formation was proposed. Unique topography indicating robust magmatism was found in the southern tip of the basin, which may be a part of older crust formed before the backarc opening.

Parece Vela盆地是菲律宾海的一个已灭绝的弧后盆地，并被认为是一些海洋核复合体（下地壳和上地幔物质暴露在表面附近/沿着一个大的拆离断层）的发育地。该盆地被认为是在岩浆匮乏的构造环境下形成的。其中一个核杂岩是世界上最大的核杂岩，扩张速度较快，因此了解其岩浆饥饿扩张和拆离断层的发育情况是一个重要的研究目标。盆地南部尚未进行系统的调查，核心杂岩的分布范围和盆地的初始演化历史一直没有解决。在本研究期间，我们在2005年进行了两次地球物理和岩石学调查，并取得了以下成果。在北纬13-14°之间发现了另一个大型核杂岩，并在那里发现了辉长岩。其他可能的核杂岩也被绘制出来，表明盆地规模的岩浆饥饿扩张发生在盆地形成的最后阶段。在核杂岩表面首次发现超糜棱岩和糜棱岩，表明存在从地幔岩石圈发育的大型拆离断层.首次绘制了盆地南端的构造图，提出了盆地早期成盆模式。在盆地南端发现了表明岩浆活动强烈的独特地形，这可能是弧后开口之前形成的较老地壳的一部分。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

メガムリオン掘削調査から探る海洋リソスフェア

通过巨量钻探探索海洋岩石圈

DOI：
发表时间：
2004
期刊：
月刊地球号外44
影响因子：
0
作者：
R.Panajotovic;M.Jelisavcic;R.Kajita;T.Tanaka;M.Kitajima;H.Cho;H.Tanaka;S.J.Buckman;小原泰彦
通讯作者：
小原泰彦

Mantle process beneath Philippine Sea back‐arc spreading ridges: A synthesis of peridotite petrology and tectonics

DOI：
10.1111/j.1440-1738.2006.00515.x
发表时间：
2006-03
期刊：
Island Arc
影响因子：
1.5
作者：
Y. Ohara
通讯作者：
Y. Ohara

Back-arc basins

DOI：
10.1007/978-1-4615-3540-9_10
发表时间：
1991
期刊：
影响因子：
0
作者：
A. Saunders;J. Tarney
通讯作者：
A. Saunders;J. Tarney

Tectonics of the southern tip of the Parece Vela Basin, Philippine Sea Plate

DOI：
10.1016/j.tecto.2007.11.017
发表时间：
2009-03
期刊：
Tectonophysics
影响因子：
2.9
作者：
K. Okino;Y. Ohara;T. Fujiwara;Sang‐Mook Lee;K. Koizumi;Y. Nakamura;Shiguo Wu
通讯作者：
K. Okino;Y. Ohara;T. Fujiwara;Sang‐Mook Lee;K. Koizumi;Y. Nakamura;Shiguo Wu

Oceanic core complexes in the Parece Vela Basin (in Japanese)

帕雷塞维拉盆地的海洋核心复合体（日语）