Along-strike variations in protothrust zone characteristics at the Nankai Trough subduction margin
Along-strike variations in protothrust zone characteristics at the Nankai Trough subduction margin
复制标题
南海海槽俯冲边缘原逆冲带特征的沿走向变化
DOI:
10.1130/ges02305.1
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发表时间:
2021
期刊:
影响因子:
2.5
通讯作者:
Kodaira, Shuichi
中科院分区:
文献类型:
--
作者:
Tilley, Hannah L.;Moore, Gregory F.;Yamashita, Mikiya;Kodaira, Shuichi
Significant along-strike changes in the protothrust zone at the toe of the Nankai Trough accretionary prism were imaged in new high-resolution seismic reflection data. The width of the protothrust zone varies greatly along strike; two spatially discrete segments have a wide protothrust zone (∼3.3–7.8 km, ∼50–110 protothrusts), and two segments have almost no protothrust zone (∼0.5–2.8 km, <20 protothrusts). The widest protothrust zone occurs in the region with the widest and thickest sediment wedge and subducting turbidite package, both of which are influenced by basement topography. The trench wedge size and lithology, the lithology of the subducting section, and the basement topography all influence the rate of consolidation in the trench wedge, which we hypothesize is an important control over the presence and width of the protothrust zone. We conclude that protothrusts are fractures that form from shear surfaces in deformation band clusters as the trench fill sediment is consolidated. Strain localization occurs at sites with a high density of protothrusts, which become the probable locations of future frontal thrust propagation. The frontal thrust may propagate forward with a lower buildup of strain where it is adjacent to a wide protothrust zone than at areas with a narrow or no protothrust zone. This is reflected in the accretionary prism geometry, where wide protothrust zones occur adjacent to fault-propagation folds with shallow prism toe surface slopes.
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影响因子:
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作者:
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通讯作者:
D. Saffer
影响因子:
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作者:
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J. Fruehn;R. S. White;T. Minshull
DOI:
--
发表时间:
1996
期刊:
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G. Westbrook
DOI:
--
发表时间:
2009
期刊:
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通讯作者:
Satish C. Singh