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A preliminary study on geomorphological characteristics and genetic mechanism of pockmarks in the Makran accretionary prism, northern Arabian Sea
Geo-Marine Letters ( IF 2.1 ) Pub Date : 2021-06-18 , DOI: 10.1007/s00367-021-00704-9
Zhen Zhang , Xiguang Deng , Huiqiang Yao , Miao Yu , Haifeng Wang , Gaowen He , Bin Liu , Tingting Wu , Sanober Kahkashan , Syed Waseem Haider , Naimatullah Sohoo , Noor Ahmed Kalhoro

Submarine pockmarks are residual negative geomorphologic features on the seafloor, which are generally considered to be related to fluid escape. In this paper, the geomorphological characteristics and genetic mechanism of pockmarks in the Makran accretionary prism are analyzed by using multi-beam bathymetric data and multichannel seismic data. Dozens of pockmarks have been found on the upper continental slope, middle continental slope, and lower continental slope of the Makran accretionary prism. Most of the pockmarks are characterized as giant and mega pockmarks. They display circular, semicircular, crescent, elongated, comet, and irregular shapes. Some show isolated distribution, while most show composite or chain-like distribution. Faults, gas chimneys, and mud diapirs act as main migration pathways through the fine-grained seabed surface sediments. Prevailing bottom currents clearly affect the morphology and development of the pockmarks. Fluid escape activities are the key factors for the development of pockmarks in the Makran accretionary prism. Due to the erosion and deposition of the submarine canyons, the pockmarks are mainly distributed on anticline ridges of the upper-middle slope on both sides of the canyons. During the development of pockmarks, their planar shapes may change, and the semicircular, elongated, and irregular pockmarks on the anticline ridges may cause seafloor collapse.



中文翻译:

阿拉伯海北部Makran增生棱柱麻点地貌特征及成因机制初步研究

海底麻点是海底残留的负面地貌特征,一般认为与流体逃逸有关。本文利用多波束测深资料和多道地震资料,分析了Makran增生棱柱上麻点的地貌特征和成因机制。在马克兰增生棱柱的上陆坡、中陆坡和下陆坡上发现了数十个麻点。大多数麻点的特征是巨大的和超大的麻点。它们显示圆形、半圆形、新月形、细长形、彗星形和不规则形状。一些显示孤立分布,而大多数显示复合或链状分布。故障,煤气烟囱,和泥底辟是通过细粒海底表层沉积物的主要迁移途径。盛行的底流显然会影响麻点的形态和发展。流体逃逸活动是在 Makran 增生棱柱中形成麻点的关键因素。由于海底峡谷的侵蚀和沉积,麻点主要分布在峡谷两侧上中斜坡的背斜脊上。麻点在发育过程中,其平面形状可能会发生变化,背斜脊上的半圆形、细长和不规则麻点可能导致海底塌陷。由于海底峡谷的侵蚀和沉积,麻点主要分布在峡谷两侧上中斜坡的背斜脊上。麻点在发育过程中,其平面形状可能会发生变化,背斜脊上的半圆形、细长和不规则麻点可能导致海底塌陷。由于海底峡谷的侵蚀和沉积,麻点主要分布在峡谷两侧上中斜坡的背斜脊上。麻坑在发育过程中,其平面形状可能发生变化,背斜脊上的半圆形、细长、不规则麻坑可能导致海底塌陷。

更新日期:2021-06-18
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