南海南沙海槽深部热状态及其构造意义

doi:10.11978/2020074

Abstract

Abstract:

The Nansha Trough is a key region where the Proto-South China Sea subducted southward below the Borneo, and the Nansha Block collided with Borneo. Its tectonic evolution contains important evolutional information of previous and present South China Sea region. To further understand the deep thermal state in the Nansha Trough, which has a great effect on its tectonic deformation, with a numerical model of the thermal diffusion equation, we first analyzed the thermal blanketing effect of rapid accumulation of sediment on observed heat flow in the deep-water region of the Nansha Trough, and then calculated the Curie depths in the study area with a magnetic spectrum analysis technique. The results show that due to the thermal blanketing of rapid accumulation of the Brunei Landslide, the observed seafloor heat flow is just 60%~77% of the deep background heat flow in the deep-water region, which is about 77~98 mW·m^-2. The Curie depth in the trough region is generally less than 16 km, which is smaller than the Curie depth (18~24 km) in the Nansha Islands and Reefs. Further analyses show that the trough region is of high background heat flow, and the high thermal state in the study area is in accord with its greatly thinned crustal thickness, which is the result of continental rifting of the southern margin of South China, and the evolution of the South China Sea.

Key words: heat flow, thermal state, Curie depth, Nansha Trough, Nansha Block

CLC Number:

P738.6

REN Ziqiang, SHI Xiaobin, WANG Xiaofang, ZHAO Peng, SHEN Yongqiang. Deep thermal state in the Nansha Trough of South China Sea and its tectonic implications[J].Journal of Tropical Oceanography, 2021, 40(4): 98-109.

Figures/Tables 11

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站位	纬度	经度	水深/m	地温梯度/(℃·km^-1)	热导率¹ /(μW·m^-3)	热导率² /(μW·m^-3)	热流¹ /(mW·m^-2)	热流² /(mW·m^-2)
A176	6°34′54″N	113°50′30″E	2350	92	0.707	0.85	65	78
A177	6°46′18″N	114°15′18″E	2863	80	0.700	0.85	56	68
A178	6°58′18″N	114°39′42″E	2882	92	0.696	0.85	64	78
A179	7°7′42″N	115°7′E	2844	83	0.699	0.85	58	71
C182	6°N	114°1′E	2305	30	0.909	×	27	×
C183	7°27′N	114°32′60″E	1476	×	×	×	14	×

参数	取值
参数	水	砂质沉积物骨架
密度/(kg·m^-3)	1030^*	2650^*
比热/(J·kg^-1·K^-1)	4183^*	1088^*
热导率/(W·m^-1·K^-1)	0.67	4.18^*
初始孔隙度	×	0.63^#
压实因子/m^-1	×	0.51×10^-3#

参数	值
沉积层生热率	1.21µW·m^-3＆
沉积层热导率	1.3W·m^-1·K^-1†或1.7W·m^-1·K^-1‡
上地壳生热率	1.8µW·m^-3#
上地壳热导率	λ^-1=0.33+0.33×10^-3T^*
下地壳生热率	0.5µW·m^-3#
下地壳热导率	λ^-1=0.41+0.29×10^-3T^*
地幔热导率	3.4W·m^-1·K^-1

Deep thermal state in the Nansha Trough of South China Sea and its tectonic implications

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