Seismic structure of Sri Lanka using receiver function analysis: A comparison with other high-grade Gondwana terrains
Seismic structure of Sri Lanka using receiver function analysis: A comparison with other high-grade Gondwana terrains
复制标题
使用接收函数分析斯里兰卡的地震结构：与其他高等级冈瓦纳地形的比较
DOI：
10.1016/j.gr.2005.10.006
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发表时间：
2006
影响因子：
6.1
通讯作者：
D. Sarkar
中科院分区：
文献类型：
--
作者：
Arundhati Pathak;M. Kumar;D. Sarkar
利用斯里兰卡的IRIS宽带站PALK的数据计算的接收函数模型显示了一个厚度为34公里的简单地壳。与全球前寒武纪盾的平均泊松比相比，其泊松比较低，为0.25，这证明了地壳似乎更长硅质，石英岩占主导地位。对冈瓦纳高原高等级地形的地壳组成进行概述，泊松比大都在0.24 ~ 0.26之间。这些低于太古宙和元古代盾构（包括变质区）的全球平均值，与大陆地壳成分平均估计的59%的二氧化硅含量一致，显示出前寒武纪盾构的特征。PALK的两个主要地幔不连续面分别位于418 km和678 km处，都比全球平均深度深，表明上地幔温度更高。
Modeling of receiver functions computed using data from the IRIS broadband station PALK in Sri Lanka reveals a simple crust with a thickness of 34 km. The crust appears to be more felsic with dominance of quartzite, as evidenced by a low Poisson's ratio of 0.25 compared to the global average for Precambrian shields. An overview of crustal composition of the high-grade terrains of Gondwana land reveals that Poisson's ratios mostly lie in the range of 0.24–0.26. These lower than global average values from both Archean and Proterozoic shields, including the metamorphic regions appear to be characteristic of Precambrian shields consistent with the average continental crust composition estimates showing 59% silica content. The two principal mantle discontinuities beneath PALK are found at 418 and 678 km, respectively, which are both deeper than the global averages, suggesting a hotter upper mantle.