Thermal structure and rheology of upper mantle beneath Zhejiang Province, China |
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| Authors: | Chuanyong Lin Lanbin Shi Xiuling Han Xiaode Chen Xiao'ou Zhang |
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| Institution: | (1) Institute of Geology, State Seismological Bureau, 100029 Beijing, China;(2) Institute of Geology, Chinese Academy of Sciences, 100029 Beijing, China |
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| Abstract: | The paleogeotherm derived from spinel and garnet lherzolites xenoliths for the upper mantle beneath Zhejiang Province, China
is higher than the oceanic geotherm but is similar to the geotherm for the upper mantle beneath eastern China constructed
by Xu et al. and the upper mantle geotherm of southeastern Australia. The crust-mantle boundary defined by this geotherm is
about 34 km, while the lithosphere-asthenosphere boundary is about 75 km. This result coincides well with geophysical data.
The study of rheological features of the xenoliths has revealed that at least two periods of deformation events occurred in
the upper mantle beneath this region. The first event might be related to upper mantle diapir occurring in this region before
or during late Tertiary, and the second might be related to the occurrence of small-scale shear zones in the upper mantle.
Project supported by the National Natural Science Foundation of China (Grant No. 49472105). |
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| Keywords: | mantle xenolith upper mantle geotherm rheology of upper mantle Zhejiang Province |
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