Age-depth correlation of the Philippine Sea back-arc basins and other marginal basins in the world
Age-depth correlation of the Philippine Sea back-arc basins and other marginal basins in the world
复制标题
菲律宾海弧后盆地与世界其他边缘盆地的时代深度对比
DOI：
10.1016/0040-1951(90)90028-7
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发表时间：
1990
期刊：
影响因子：
2.9
通讯作者：
Kazuo Kobayashi
中科院分区：
文献类型：
--
作者：
Park Chung;K. Tamaki;Kazuo Kobayashi
对菲律宾海弧后盆地、马里亚纳海槽、四国盆地、帕雷斯贝拉盆地和西菲律宾盆地正在进行的测深剖面进行的统计分析揭示了这些盆地的年龄-深度相关性。菲律宾海基底深度为3200 ~ 6000 m，年龄为0 ~ 60 Ma。整个菲律宾海的年龄-深度曲线可以用下面的方程表示：深度（m）= 3222 + 366 μ m年龄（Ma）该方程表明，菲律宾海的基底深度比同年龄的主要洋底深约800 m。这个方程中的系数366接近于主要海洋的系数350。这表明菲律宾海岩石圈的冷却过程与主要大洋的冷却过程相似，而菲律宾海深层的结构和组成与主要大洋的岩石圈冷却过程不同，但ETOP数字测深资料的分析表明，这种关系并不适用于其它一些边缘盆地。弧后盆地以外的边缘盆地一般遵循主要海洋的年龄-深度曲线。年轻弧后盆地（<10 Ma）的基底深度变化较大，其基底深度与俯冲板片的倾角有很好的相关性。较浅的弧后盆地与较缓倾斜的板片有关，较深的弧后盆地与较陡倾斜的板片有关。然而，年龄大于15 Ma的弧后盆地总是比主要海洋深，并遵循菲律宾海弧后盆地的年龄-深度曲线。
Statistical analysis of underway bathymetric profiles of the Philippine Sea back-arc basins; the Mariana Trough, the Shikoku Basin, the Parece Vela Basin and the West Philippine Basin reveals an age-depth correlation in the basins. The basement depths of the Philippine Sea range from 3200 to 6000 m with their ages from 0 to 60 Ma. The age-depth curve of the whole Philippine Sea can be represented by the following equation: Depth (m) = 3222 + 366√Age (Ma)The equation shows that the basement depth of the Philippine Sea is about 800 m deeper than that of the major ocean floors of the same age. The coefficient of 366 in this equation is close to that for major oceans, 350. This suggests that the cooling processes of the lithospheres in the Philippine Sea and major oceans are similar to each other, whereas the structure and composition of the deeper layers of the Philippine Sea seem to be different from those of major oceans.Our analysis of ETOP digital bathymetric data, however, indicates that this relationship does not hold for some other marginal basins. Marginal basins other than back-arc basins generally follow the age-depth curve of major oceans. Young back-arc basins ( <10 Ma) show a variety of the basement depth from shallower to deeper than major oceans and their basement depths are well correlated with dipping angles of the corresponding subducting slabs. Shallower back-arc basins are associated with more gently dipping slabs and deeper back-arc basins with more steeply dipping slabs. The back-arc basins older than 15 Ma, however, are always deeper than the major oceans and follow the age-depth curve of the Philippine Sea back-arc basins.