南海北部大陆架盆地热结构

基金项目:

国家自然科学基金项目(40074022)和国家重点基础研究发展规划项目(G2000047604)

THE THERMAL STRUCTURE OF MAIN SEDIMENTARY BASINS IN THE NORTHERN MARGIN OF THE SOUTH CHINA SEA

1. The Greduate School of the Chinese Academy of Sciences, Beijing 100039, China;
2. The Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

摘要: 南海北部大陆架盆地地热研究发现,各盆地深部温度结构和地壳热流在地表热流中所占比例不均一。其中,珠江口盆地地壳热流贡献小于25%,由陆向洋方向递减;莺歌海盆地中部地壳热流贡献小于30%,向NE方向递增;北部湾盆地地壳热流贡献在38%~42%之间稳定变化。分析表明,此区各盆地热结构的不均一性与大陆架地壳减薄、软流圈热物质上涌等因素有关。
- 南海北部大陆架 /
- 热流构成 /
- 莫霍面温度
Abstract: Geothermal study,for main sedimentary basins of the northern margin of the South China Sea,reveals that the distribution of temperature at depth is different.Especially,the constitutions of heat flow among these basins are not uniform with respect to each other.Calculation shows that in Preal River Mouth basin the contribution of crustal heat flow is lower than 25% and decreased by degrees from margin to sea.In Yinggehai basin,the contribution of crustal heat flow is lower than 30% and increased by degrees along the northeast direction.In Beibuwan basin,the contribution of crustal heat flow varies between 38% and 42%.The results suggest that the instability of thermal structure in this region can be attributed to the thinning of marginal crust and the up flowing of hot material of asthenosphere.
- Northern Margin of the South China Sea /
- constitution of heat flow /
- temperature of Moho