Structural and morpho-tectonic evidence of Quaternary faulting within the Moutere Depression, South Island, New Zealand
Structural and morpho-tectonic evidence of Quaternary faulting within the Moutere Depression, South Island, New Zealand
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新西兰南岛穆特雷凹陷第四纪断层的构造和地貌构造证据
DOI：
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发表时间：
2018
影响因子：
2.2
通讯作者：
R. Sibson
中科院分区：
文献类型：
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作者：
F. Ghisetti;M. Johnston;P. Wopereis;R. Sibson
摘要穆特凹陷的地下结构被厚厚的第四系砾石层序所掩盖。地表和地下资料已被用来定义一个盲目的基底弹出，其西侧以一条NNE向的逆断层倾角约50°E(Ruby Bay-Moutere断层，RB-Mf)为界。RB-Mf在几何和运动学上与邻近的Waimea-Flaxmore断层系统(W-FFS)相似，并与近海的Surville断层和南部的Tutaki断层相连。Rb-Mf的逆滑活动始于21-18 Ma以后，并在下更新世砾石层序沉积后继续，但断层尖端仍被埋藏。从晚第四纪河流阶地的地表地形和变形推断，持续的第四纪活动伴随着上盘背斜的递进发展。收集的证据表明，Rb-Mf能够在现代应力场中被重新激活，尽管滑动速率低于全新世活动的W-FFS。
ABSTRACT The subsurface structure of the Moutere Depression is obscured by a thick Plio-Quaternary gravel sequence. Surface and subsurface data have been used to define a blind basement pop-up bounded to the west by a NNE-striking reverse fault dipping c. 50°E (Ruby Bay-Moutere Fault, RB-MF). The RB-MF is geometrically and kinematically similar to the adjacent Waimea-Flaxmore Fault System (W-FFS) and linked to the Surville Fault offshore and the Tutaki Fault to the south. Reverse-slip activity on the RB-MF started post 21–18 Ma and continued after deposition of the lower Pleistocene gravel sequence, but the fault tip remains buried. Persistent Quaternary activity with progressive development of a hanging wall anticline is inferred from surface topography and deformation of late Quaternary river terraces. The collected evidence suggests that the RB-MF is capable of being reactivated in the present-day stress field, though slip rates are lower than those of the Holocene-active W-FFS.