北冰洋-欧亚大陆-太平洋地学断面东南段岩石圈有效弹性厚度

Effective Lithospheric Elastic Thickness of Southeastern Part of Arctic Ocean-Eurasia Continent-Pacific Ocean Geoscience Transect

大陆岩石圈有效弹性厚度 (Te)是表示岩石圈强度的参数 ,计算该参数对研究岩石圈大规模构造 ,分析大陆板块内的均衡补偿机制有一定意义 .利用Forsyth提出的相关技术计算了北冰洋 -欧亚大陆 -太平洋地学断面东南段自黑水到泉州的Te 值 .并分析了重力和地形波长的相关性特征 ,初步认为 :计算Te 值所选的每个数据块在短波长 (6 .6～ 10 0km)内岩石圈板块的强度足以平衡地形负载 ,重力和地形不相关 ;在长波长 (10 0～ 2 5 0km)内 ,地形及地下负载由弯曲模型补偿 ,岩石圈板块在地形及地下负载作用下而挠曲 .断面通过地段具有较低热流密度值的四川陆核有较高的Te 值 ,具有较高热流密度值的宁化、大田地区有较低的Te 值 ,反映了较高的热流密度值对应较低的Te 值 ;较低的热流密度值对应较高Te 值的关系 .Te 可分为南东低值段和北西高值段 .地壳厚度大体上与Te 值呈正相关关系 .

The effective lithospheric elastic thickness of the continent is an important parameter to examine the large scale structure and analyze the mechanism of isostatic compensation within the plate, and is a parameter standing for the strength of the lithosphere. The T e values along Quanzhou Heishui, the southeast section of the Arctic Ocean Eurasian continent Pacific Ocean geoscience transect, are estimated by using the coherence technique developed by Forsthy. Studies of the feature of the coherence between gravity and topography suggest that at short wavelengths (6.6-100 km) for each data box that is used to estimate T e, the plate is strong enough to support topographic loads and gravity and topography are uncorrelated; at long wavelengths where the plate is deflected by surface and subsurface loads which are compensated by the flexure model. The high T e values of Sichuan land stone with low heat flow values and the low T e values in Ninghua, Datian with high heat flow values reflect a correlation, with low heat flow values corresponding to high T e values and with high heat flow values corresponding to low T e values. T e values can be divided into two sections: northwest high section and southeast low section. There is roughly a positive correlation between crustal thickness and effective elastic thickness of the lithosphere.