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首页> 外文期刊>Journal of Asian earth sciences >Heat flow and thermal evolution of a passive continental margin from shelf to slope - A case study on the Pearl River Mouth Basin, northern South China Sea
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Heat flow and thermal evolution of a passive continental margin from shelf to slope - A case study on the Pearl River Mouth Basin, northern South China Sea

机译：陆架到斜坡的被动大陆边缘的热流和热演化-以南海北部珠江口盆地为例

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摘要

The Pearl River Mouth Basin (PRMB), the largest basin in the northern continental margin of the South China Sea (SCS), has been one of the key areas to characterize geothermal field and thermal evolution of a passive continental margin. The thermal history of the Pearl River Mouth Basin is related to the seafloor spreading of the SCS in the late Early Oligocene. Heat flow measurements show that the PRMB is characterized by a high background heat flow with average heat flow of 71.8 +/- 13.6 mW/m(2). The present-day heat flow of the northern SCS increases from the northern shelf with the thick crust to the southern slope with the thinned crust. This study employs forward and inverse modeling to simulate the rift and post-rift processes exampled by four wells at different structural settings. Two thermal evolution models of the PRMB are established for continental shelf and continental slope. In the continental shelf, heat flow increased rapidly twice during the syn-rift stage, and then followed by continuous thermal subsidence with heat flow value decreased during the post-rift stage. While the heat flow in the slope continuously increased due to lithospheric thinning, mantle upwelling and resulting multiepisode seafloor spreading in SCS during the Neogene post-rift stage, which is different from the previously proposed decreasing heat model for the slope during the post-rift. Heat flow gradually reduced after the cessation of the sea floor spreading (10 Ma). The local multi-staged magmatic activities mainly contribute to the high level of maturity in the Liwan Sag located in the lower slope.
机译：珠江口盆地（PRMB）是南中国海（SCS）北部大陆边缘最大的盆地，一直是表征被动大陆边缘地热场和热演化特征的关键区域之一。珠江口盆地的热史与渐新世早期晚期南海的海底扩散有关。热流测量表明，PRMB的特点是背景热流较高，平均热流为71.8 +/- 13.6 mW / m（2）。如今，南海北部的热流从地壳较厚的北部陆架到地壳变薄的南部斜坡增加。这项研究采用正向和逆向建模来模拟在不同结构设置下以四口井为例的裂谷和裂谷后过程。针对大陆架和大陆坡建立了两种PRMB热演化模型。在大陆架上，在同裂谷阶段热流迅速增加两次，然后持续不断的热沉陷，在裂谷后阶段热流值降低。在斜坡上的热流由于岩石圈变薄，地幔上升流以及在新近裂谷后阶段的南海南海扩张而不断增加，这与先前提出的在裂谷后减少斜坡的热模型不同。在海床扩展停止后（10 Ma），热流逐渐减少。局部的多阶段岩浆活动主要是导致下斜坡荔湾凹陷的高成熟度。

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