Unwrapping reworked crust at the Columbia supercontinent margin within central southern Amazon Craton using multi-source geophysics and geochronology data synergy

IF 8.5 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
João G. Motta , P.G. Betts , V.T. Meira , V.G. Trevisan , C.R. de Souza Filho
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Abstract

The geometry and evolution of pre-existing basement in accretionary belts bordering supercontinents are often unclear. Integrative interpretation of long-wavelength potential field satellite data can image deep crust structure, improving our understanding of lithospheric processes that formed these margins bottom-up. Here, we present a multidisciplinary interpretation of the lithospheric architecture of the central southern Amazon Craton, a fragment of an accretionary belt at the southwestern Columbia supercontinent margin. Satellite-borne gravity and magnetic data, airborne magnetic data, passive seismic (Vp/Vs ratio, crustal thickness) and seismic tomography data reveals that basement terranes from the interior of the craton extend into the accretionary margin of Columbia. We demonstrate a vertically heterogeneous structure with an underlying strongly reworked pre-Columbia tectonic wedge that sustained prolonged modification during the supercontinent assembly as corroborated by Nd isotope and geochronology data. Nd isotope data suggest that the protracted orogenic wedge was influenced by subduction angle shifts over time, including addition of substantial juvenile material during slab retreat events. This interplay promoted Craton growth at the supercontinent margin while keeping a subtle record of the pre-existing framework. Our findings point to the possible misrepresentation of basement extension and geometry of supercontinent margins elsewhere.

Abstract Image

利用多源地球物理和地质年代学数据协同分析亚马逊克拉通中南部哥伦比亚超大陆边缘的复盖地壳
在与超大陆接壤的增生带中,已有基底的几何形状和演化往往不清楚。对长波长势场卫星数据的综合解释可以成像地壳深部结构,从而提高我们对自下而上形成这些边缘的岩石圈过程的理解。在这里,我们对亚马逊克拉通中南部的岩石圈结构进行了多学科的解释,亚马逊克拉通是西南哥伦比亚超大陆边缘的一个增生带的碎片。卫星重磁资料、航空磁资料、被动地震资料(Vp/Vs比、地壳厚度)和地震层析成像资料显示,克拉通内部的基底地体延伸至哥伦比亚的增生边缘。根据Nd同位素和地质年代学数据,我们发现了一个垂直非均质构造,其下部有一个强烈改造的前哥伦比亚构造楔,在超大陆组合期间持续了长时间的改造。Nd同位素数据表明,随着时间的推移,俯冲角度的变化影响了长时间的造山楔,包括在板块后退事件中添加了大量的幼年物质。这种相互作用促进了克拉通在超大陆边缘的生长,同时保持了对原有框架的微妙记录。我们的发现指出,其他地方的基底伸展和超大陆边缘的几何形状可能存在误解。
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来源期刊
Geoscience frontiers
Geoscience frontiers Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
17.80
自引率
3.40%
发文量
147
审稿时长
35 days
期刊介绍: Geoscience Frontiers (GSF) is the Journal of China University of Geosciences (Beijing) and Peking University. It publishes peer-reviewed research articles and reviews in interdisciplinary fields of Earth and Planetary Sciences. GSF covers various research areas including petrology and geochemistry, lithospheric architecture and mantle dynamics, global tectonics, economic geology and fuel exploration, geophysics, stratigraphy and paleontology, environmental and engineering geology, astrogeology, and the nexus of resources-energy-emissions-climate under Sustainable Development Goals. The journal aims to bridge innovative, provocative, and challenging concepts and models in these fields, providing insights on correlations and evolution.
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