Bathymetry and geological setting of the South Sandwich Islands volcanic arc

Bathymetry and geological setting of the South Sandwich Islands volcanic arc
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南桑威奇群岛火山弧的测深和地质环境

DOI:
10.1017/s0954102016000043
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发表时间:
2016
期刊:
影响因子:
1.6
通讯作者:
Bohrmann
Bohrmann
中科院分区:
地球科学4区
文献类型:
--
作者:
Fretwell;Larter;Martin;Smellie;Bohrmann

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南桑威奇群岛和相关的海山构成了位于南大西洋的一个活跃俯冲系统的火山弧。我们介绍一幅南桑威奇群岛和相关的东斯科舍海脊弧后扩张中心的水深测量和地质背景图,该图由两部分组成:第一部分是火山弧、海沟和弧后的区域概览,第二部分是各岛屿的详细地图。第一面显示了1:750 000比例尺的大洋内、大部分为海底的南桑威奇弧、弧后系统和俯冲系统的其他构造边界的测深图。第2面岛屿的卫星图像比例为1:50 000和1:25 000,并显示了等高线和主要火山特征。这些地图是该地区第一份详细的地形图和测深图。这些岛屿完全是火山的起源,大多数在历史上都有火山或火山活动。许多岛屿被冰雪覆盖,该地图构成了火山活动和气候变化造成的未来冰川变化的基线。弧后扩张中心由9个部分组成,其中大部分具有裂谷状形态。
The South Sandwich Islands and associated seamounts constitute the volcanic arc of an active subduction system situated in the South Atlantic. We introduce a map of the bathymetry and geological setting of the South Sandwich Islands and the associated East Scotia Ridge back-arc spreading centre that consists of two sides: side 1, a regional overview of the volcanic arc, trench and back-arc, and side 2, detailed maps of the individual islands. Side 1 displays the bathymetry at scale 1:750 000 of the intra-oceanic, largely submarine South Sandwich arc, the back-arc system and other tectonic boundaries of the subduction system. Satellite images of the islands on side 2 are at scales of 1:50 000 and 1:25 000 with contours and main volcanological features indicated. These maps are the first detailed topological and bathymetric maps of the area. The islands are entirely volcanic in origin, and most have been volcanically or fumarolically active in historic times. Many of the islands are ice-covered, and the map forms a baseline for future glaciological changes caused by volcanic activities and climate change. The back-arc spreading centre consists of nine segments, most of which have rift-like morphologies.
DOI: 10.1017/s0954102008001107
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发表时间: 2001
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