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近年来,美国和日本的一些科学家公布了在南海中央盆地海底测得的36个热流值。本文结合我们所作的部分地球物理成果对这些热流数据进行初步分析。 南海中央盆地热流值的分布特点有三:1.盆地中部热流值高,边缘较低,海沟(马尼拉海沟)与海槽(巴拉望海槽)处最低;2.热流的最高值(3.63HFU)出现在中央盆地西缘断裂的东侧,沿此北东向大断裂(属岩石圈断裂)的走向,集中出现大于2.5HFU的高值,此种高热流值与大断裂相伴随的现象反映了盆地高热流值与大断裂密切有关;3.盆地中大于2HFU的等值线成北东南西向展布,与构造线的方向一致,但在西沙群岛与中沙群岛的北缘,沿北西西方向,于北纬16°30′附近,序在一稍低的热流带,热流值在1.8—1.99HFU之间。此低热流带将盆地热流值分成两个区。此带以北为北区,以南为南区。北区热流值在1.9—2.46HFU之间;南区热流值较高,为2.11—3.63HFU之间。北区热流等值线为北东偏东方向展布,南区为北东向。 为了进一步了解南海热流值的特点,对照了日本海、西菲律宾海、东菲律宾PareceVela海、苏禄海、苏拉威西海等西太洋边缘海的热流值与构造的关系。总的看来,与南海中央盆地类似,这些海盆的热流值大致都为中部高边缘低,最高值大多沿大断裂带或板块扩张轴的延伸方向分布。看来,边缘海的热流值?
In recent years, some scientists in the United States and Japan have released 36 heat flow values measured at the bottom of the South China Sea Central Basin. In this paper, we make a preliminary analysis of these heat flow data based on some of the geophysical results we have made. There are three characteristics of the distribution of heat flow in the Central South China Sea Basin: 1. The highest heat flow value in the central part of the basin with a low margin, the lowest in the trench (Manila trench) and the trough (Palawan trough); 2. The highest heat flux (3.63HFU) On the east side of the central margin of the central basin, along the north-easterly major faults (lithospheric faults), concentrations of more than 2.5HFU occur intensively. Such high heat flux values are accompanied by large faults, reflecting the basin The high heat flow value is closely related to the major faults. (3) The isoline line greater than 2HFU in the basin spreads north-southeastward and westward, which is consistent with the direction of the tectonic line. However, in the northern margin of Xisha and Zhongsha Islands, At a latitude of 16 ° 30 ’north latitude, a slightly lower heat flow zone with a heat flow of between 1.8 and 1.99 HFU. This low-heat flow zone divides the basin heat flow into two zones. This zone is north to north and south to south. North heat flow between 1.9-2.46HFU; South heat flow is higher, between 2.11-3.63HFU. The northern isotherm contour is distributed to the northeast and east and the south to the north. In order to further understand the characteristics of the South China Sea heat flow, the relationship between the heat flow and the tectonic setting in the marginal sea of the western Pacific Ocean, such as the Japan Sea, the West Philippine Sea, the PareceVela Sea in the East Philippines, the Sulu Sea and the Sulawesi Sea, is contrasted. Generally speaking, similar to the South China Sea Central Basin, the heat flow values of these basins are generally lower in the central high margin and the highest values are mostly distributed along the extension direction of the major fault zone or plate expansion axis. It seems that the edge of the sea heat flow value?