Orogen-scale transpression accounts for GPS velocities and kinematic partitioning in the Southern Andes
Orogen-scale transpression accounts for GPS velocities and kinematic partitioning in the Southern Andes
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造山带规模变形解释了安第斯山脉南部的 GPS 速度和运动分区
DOI:
10.1038/s43247-021-00241-4
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发表时间:
2021
影响因子:
7.9
通讯作者:
Riller
中科院分区:
文献类型:
--
作者:
Eisermann;Göllner;Riller
The Southern Andes are regarded as a typical subduction orogen formed by oblique plate convergence. However, there is considerable uncertainty as to how deformation is kinematically partitioned in the upper plate. Here we use analogue experiments conducted in theMultiBox(Multifunctional analogue Box) apparatus to investigate dextral transpression in the Southern Andes between 34 °S and 42 °S. We find that transpression in our models is caused mainly by two prominent fault sets; transpression zone-parallel dextral oblique-slip thrust faults and sinistral oblique-slip reverse faults. The latter of these sets may be equivalent to northwest-striking faults which were believed to be pre-Andean in origin. We also model variable crustal strength in our experiments and find that stronger crust north of 37 °S and weaker crust to the south best reproduces the observed GPS velocity field. We propose that transpression in the Southern Andes is accommodated by distributed deformation rather than localized displacements on few margin-parallel faults.
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DOI:
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