Detailed Analysis of Near Tectonic Features Along the East Pacific Rise at 16°N, Near the Mathematician Hot Spot
Detailed Analysis of Near Tectonic Features Along the East Pacific Rise at 16°N, Near the Mathematician Hot Spot
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数学家热点附近北纬 16°东太平洋海隆沿线近构造特征的详细分析
DOI：
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
P. Gente
中科院分区：
文献类型：
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作者：
M. Le Saout;R. Thibaud;P. Gente
快速扩张脊轴部的扩张过程主要受岩浆活动的控制，而远离轴部的构造活动则占主导地位。高分辨率近海底测深数据，照片，视频和潜水调查的人类观察被用来开发东太平洋隆起（EPR）16°N段的详细构造分析。这些数据被用来评估如何一个高度岩浆段，靠近热点，影响成核和断层模式的演变，并影响扩张轴2公里内的构造应变的评价。研究表明：（1）岩墙侵入和构造伸展对构造形迹的发育有不同的响应;（2）脆性伸展的启动强烈地受轴向岩浆透镜的位置和2A层发育的控制;以及（3）高原西部的高岩浆收支和离轴岩浆透镜体对沿着16°N的中部。在轴向峰顶区域内，EPR上16°N处超过2%的板块分离被脆性伸展所容纳，正如在其他EPR段所观察到的那样。数学家热点与该EPR段的相互作用对构造变形的启动没有明显影响，但确实减少了脆性变形的发展。
Spreading processes at the axes of fast spreading ridges are mainly controlled by magmatic activity, whereas tectonic activity dominates further away from the axis. High‐resolution near‐bottom bathymetry data, photographs, videos, and human observations from submersible surveys are used to develop a detailed tectonic analysis of the 16°N segment of the East Pacific Rise (EPR). These data are used to evaluate how a highly magmatic segment, close to a hot spot, affects the nucleation and evolution of faulting patterns and impacts the evaluation of tectonic strain within 2 km of the spreading axis. Our study shows that (1) the growth of tectonic features differs in response to dike intrusion and tectonic extension, (2) the initiation of brittle extension is strongly controlled by the location of the axial magma lens and the development of layer 2A, and (3) the high magmatic budget and the off‐axis magma lens in the west part of the plateau do not significantly impact the initiation of brittle extension along the central portion of the 16°N segment. Within the axial summit region, more than 2% of plate separation at 16°N on the EPR is accommodated by brittle extension, as is observed at other EPR segments. The interaction of the Mathematician hot spot with this EPR segment has no significant influence on the initiation of the tectonic deformation, but it does reduce the development of the brittle deformation.
影响因子：
2.8
作者：
Clague, David A.;Paduan, Jennifer B.;Portner, Ryan A.
通讯作者：
Portner, Ryan A.