Constraining the density evolution during destruction of the lithospheric mantle in the eastern North China Craton
| Autor: | Zhilin Ye, Qizhe Tang, Jingui Xu, Dongzhou Zhang, Dawei Fan, Wenge Zhou |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Peridotite
Basalt geography Olivine geography.geographical_feature_category 010504 meteorology & atmospheric sciences Petrophysics Geology engineering.material 010502 geochemistry & geophysics 01 natural sciences Mantle (geology) Craton Lithosphere engineering Xenolith Petrology 0105 earth and related environmental sciences |
| Zdroj: | Gondwana Research. 91:18-30 |
| ISSN: | 1342-937X |
| Popis: | The thermoelastic properties of minerals in mantle xenoliths combined with the thermal states can provide an integrated understanding of the petrophysics of the lithospheric mantle. Here, we conducted high-pressure and high-temperature experiments on the main minerals (e.g. olivine, orthopyroxene, clinopyroxene, spinel, and garnet) in peridotite xenoliths from basalt of the eastern North China Craton (NCC) using in situ synchrotron single-crystal X-ray diffraction combined with diamond anvil cells. The pressure-temperature-volume data were fitted to the third-order Birch-Murnaghan equations of state and yielded the thermoelastic parameters that included bulk modulus, pressure and temperature derivatives, and thermal expansion coefficients. The density profiles of the eastern NCC during the destruction process since the Mesozoic are presented from the temporal and spatial aspects. The lithospheric density dramatically decreased during destruction, and high heat flow may have been a trigger. The spatially distributed density profile also provides firm evidence for lateral heterogeneities in the eastern NCC. This may suggest that the present mantle is characterized by heterogeneous destruction of the NCC. |
| Databáze: | OpenAIRE |
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