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本文基于弹性薄板模型,结合水深、空间重力资料,使用空间域褶积算法获取了凯尔盖朗海台岩石圈有效弹性厚度(Te)的空间变化特征,有效地揭示了凯尔盖朗海台岩石圈热力学特征.整个研究区域内,T_e的分布范围在5~35 km之间;其中在凯尔盖朗海台北部(NKP)的Te值较高,在25~35 km之间变化,说明CKP、SKP形成时负载于较强挠曲刚度的岩石圈之上;而在海台中部(CKP)以及南部(SKP),T_e值异常低,基本维持在10 km以内.经对比发现,海台载荷形成时刻的洋壳年龄与T_e值之间存在弱相关性,表明研究区域内岩石圈的热力学性质存在诸多不同.进一步结合凯尔盖朗热点喷发历史,可以推测:CKP、SKP的异常低T_e值和较深的莫霍面(~23 km)可能与当时非常高的岩浆通量有关.强烈的热点活动“烘烤”了周围地壳,降低了下覆岩石圈的挠曲刚度.NKP形成时岩浆喷发速率低,没有改变下覆岩石圈的热结构,从而保留了其一定的挠曲刚度.Elan Bank(EB)的T_e高值(~30 km),推测与此处的残留陆块有关.
In this paper, based on the elastic thin plate model, combining with the water depth and gravity data, the spatial variation of the effective elastic thickness (Te) of the lithosphere in the Kelgailong platform was obtained by using the convolution algorithm in the space domain, Lithosphere thermodynamic characteristics. Within the whole study area, the distribution range of T_e is between 5 and 35 km. Among them, the Te value at NKP in the Kelgalang Plateau ranges from 25 to 35 km CKP and SKP were formed on the lithosphere with strong flexural rigidity when they were formed. However, the values of T_e in the middle of the sea surface (CKP) and the southern part (SKP) were very low and remained basically within 10 km. There is a weak correlation between the age of the crust and the value of T_e at the time of load formation, which indicates that there are many differences in the thermodynamic properties of the lithosphere in the study area.Combining with the history of Kyle Geiger hotspot eruptions, it can be inferred that the anomaly of CKP and SKP is low T_e The value and deeper Moho (~ 23 km) may be related to the very high magmatic flux at that time.Highly intense activity “baked” the surrounding crust and reduced the flexural rigidity of the underlying lithosphere.NKP The formation of magma eruption rate is low, did not change the underlying thermal structure of the lithosphere, While retaining some of its flexural rigidity .Elan Bank (EB) is a high value T_e (~ 30 km), and the residual land masses presumed here concerned.