Influence of Melt-Peridotite Interactions on Deformation and Seismic Properties of the Upper Mantle Beneath a Destroyed Craton: A Case Study of the Damaping Peridotites From the North China Craton

被引:3
|
作者
Wen, Da-Peng [1 ,2 ]
Wang, Yong-Feng [1 ,2 ,3 ]
Zhang, Jun-Feng [1 ,2 ,3 ]
机构
[1] China Univ Geosci, Sch Earth Sci, Wuhan, Peoples R China
[2] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R China
[3] China Univ Geosci, Global Tecton Ctr, Sch Earth Sci, Wuhan, Peoples R China
基金
中国国家自然科学基金;
关键词
melt-peridotite interaction; deformation; olivine fabric; crystallographic preferred orientation; seismic anisotropy; North China Craton; SINO-KOREAN CRATON; LATTICE PREFERRED ORIENTATIONS; MOLTEN UPPER-MANTLE; LITHOSPHERIC MANTLE; ELASTIC-CONSTANTS; ROCK INTERACTION; WATER CONTENTS; MELT/PERIDOTITE INTERACTION; EXPERIMENTAL CONSTRAINTS; AZIMUTHAL ANISOTROPY;
D O I
10.1029/2022JB026263
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Extensive melt-peridotite interactions had been documented in the lithospheric mantle beneath the North China Craton (NCC), a prime example of destroyed cratons in the world. Yet the impacts of melt-peridotite interactions on the deformation and seismic anisotropy of the NCC upper mantle remain unclear. Here we studied in detail the microstructure, crystallographic preferred orientation (CPO) of minerals, and seismic properties of 26 peridotite xenoliths from the Damaping area of the NCC. The studied samples can be classified into two groups: weakly to nonfoliated and strongly foliated. Petrographic and microstructural observations suggest that multiple melt-peridotite interactions and at least two stages of deformation had influenced samples from both microstructural groups. Dislocation creep in response to a transpression deformation led to the [010]-fiber type olivine CPOs in most samples. Variable degrees of annealing followed the last stage of deformation. Due to a higher degree of melt-peridotite interactions, which had promoted nondislocation creep, and more extensive annealing, olivine and pyroxene in the strongly foliated samples developed weaker CPOs. This in turn leads to weaker maximum P wave propagation anisotropy and S wave polarization anisotropy for this microstructural group. Our data, therefore, cast light on a strong control of intensity of melt-peridotite interactions on deformation and seismic properties of the upper mantle beneath the NCC. If foliation and lineation are vertical and horizontal, respectively, the measured SKS splitting parameters can be well explained by the "fossil" anisotropy frozen in the lithospheric mantle, with no need to invoke asthenospheric flow as a source of the anisotropy.
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页数:30
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