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基于新磁数据的东南极富士圆顶地区的构造结构

Tectonic structures of the Dome Fuji region, East Antarctica, based on new magnetic data.

作者信息

Guy Alexandra, Eagles Graeme, Eisen Olaf

机构信息

Czech Geological Survey, Prague, Czech Republic.

Alfred-Wegener-Institut Helmholtz-Zentrum Für Polar Und Meeresforschung, Bremerhaven, Germany.

出版信息

Sci Rep. 2024 Aug 10;14(1):18607. doi: 10.1038/s41598-024-69471-8.

DOI:10.1038/s41598-024-69471-8
PMID:39127802
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11316747/
Abstract

The Oldest Ice Reconnaissance (OIR) airborne geophysical survey in East Antarctica was flown over approximately 170,000 km of the Dome Fuji region in 2016/17. The survey's results support new insights into the subglacial geology and its meaning for the tectonic histories of the supercontinents Rodinia and Gondwana. The new magnetic and radar-derived bed topography data are integrated with previously acquired magnetic and gravity data, allowing the mapping of crustal domains within and beyond the survey's limits. The magnetic data reveal three distinct domains within the survey region, delineated by N-S oriented boundaries, partly aligned with gravity domains following upward continuation transformations for both datasets. Additionally, four primary sets of magnetic lineaments were identified, exhibiting correlations with topographic and gravity patterns. These correlations indicate the continuation of the Tonian Oceanic Arc Super Terrane (TOAST) southward of its previously known southern limit. Moreover, an E-W-trending magnetic anomaly, the Elbert magnetic anomaly, suggests the suture between the recently-proposed subglacial Valkyrie craton and the TOAST. Furthermore, the analysis reveals a broad scale shear zone, named here the OIR shear zone, which formed as a result of oblique collision of the Ruker and Valkyrie cratons during the amalgamation of Gondwana.

摘要

2016/17年，在东南极洲进行了最古老的冰上探测（OIR）航空地球物理调查，飞行覆盖了富士圆顶地区约17万公里的区域。该调查结果为冰下地质及其对超大陆罗迪尼亚和冈瓦纳构造历史的意义提供了新的见解。新的磁力和雷达衍生的床面地形数据与先前获取的磁力和重力数据相结合，使得能够绘制出调查区域内外的地壳区域图。磁力数据揭示了调查区域内三个不同的区域，由南北走向的边界划分，在对两个数据集进行向上延拓变换后，部分与重力区域对齐。此外，还识别出了四组主要的磁力线性构造，它们与地形和重力模式存在相关性。这些相关性表明托宁洋弧超级地体（TOAST）在其先前已知的南部界限以南继续延伸。此外，一个东西走向的磁异常，即埃尔伯特磁异常，表明了最近提出的冰下瓦尔基里克拉通与TOAST之间的缝合带。此外，分析还揭示了一个大范围的剪切带，在此命名为OIR剪切带，它是在冈瓦纳合并期间鲁克和瓦尔基里克拉通斜向碰撞形成的。

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本文引用的文献

1
A cryptic Gondwana-forming orogen located in Antarctica.位于南极洲的一个神秘冈瓦纳造山带。
Sci Rep. 2018 May 30;8(1):8371. doi: 10.1038/s41598-018-26530-1.
2
New Antarctic Gravity Anomaly Grid for Enhanced Geodetic and Geophysical Studies in Antarctica.用于加强南极洲大地测量和地球物理研究的新南极重力异常网格。
Geophys Res Lett. 2016 Jan 28;43(2):600-610. doi: 10.1002/2015GL067439. Epub 2016 Jan 21.
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Geology and environments of subglacial Lake Vostok.沃斯托克冰下湖的地质与环境。
Philos Trans A Math Phys Eng Sci. 2016 Jan 28;374(2059). doi: 10.1098/rsta.2014.0302.
4
East Antarctic rifting triggers uplift of the Gamburtsev Mountains.东南极裂谷活动引发甘布尔采夫山脉隆升。
Nature. 2011 Nov 16;479(7373):388-92. doi: 10.1038/nature10566.