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Journal: |
Journal of Geophysical Research 2019 No.9
clicks:147 |
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Title:
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Author:
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X. Rui1 and D. S. Stamps2 |
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Adress: |
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Abstract:
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The Xianshuihe‐Xiaojiang fault system (XXFS) plays a crucial role in accommodating relative
motions of the south China block and the expanding Tibetan Plateau. Compared to the narrow southern and
northern segments of the XXFS, the central section (also referred to as the Daliangshan mountain area) is
broader and dissected by a network of faults. Geologic studies suggest that three major NNW trending faults
may dominate slip partitioning of more recent faults in this region. However, due to accessibility issues,
sparse geodetic studies have constrained geodetic fault slip rates with contradictory results. In this study, we
use 17 new Global Navigation Satellite System sites combined with existing solutions to investigate slip
partitioning of the region. We derive a tectonic velocity solution, develop a block kinematic model
constrained by Euler pole clustering technique, and calculate geodetic fault slip rates to compare with
geologic fault slip rates. We confirm that the Anninghe‐Daliangshan sliver (ADS) is a distinct, rigid block,
and we resolve a new, rigid Daliangshan‐Yingjing‐Mabian block (DYB). Kinematic modeling predicts
long‐term slip rates that suggest both the ADS and the DYB partition (~10.0–12.0 mm/year) relative motion
between the Tibetan Plateau and south China block in the central XXFS, reconciling geologic observations.
We suggest that both the continuum and microplate deformation patterns are present in our study
area, of which the local tectonics is better explained by the microplate model, but scale of the kinematics
makes its motion more consistent with the continuum model. |
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