哥伦比亚岩石圈的热结构:区域和海盆尺度分析

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Tectonophysics Pub Date : 2024-07-06 DOI:10.1016/j.tecto.2024.230413
Harold Buitrago , Florian Neumann , Juan Contreras , Carlos A. Vargas
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引用次数: 0

摘要

岩石圈的热状态强烈影响着各种区域和地方地质过程,包括地壳变形、油气成熟、氢气生成和地热现象,这一点已得到公认。此外,热结构对构造特征具有高度敏感性,这一特性在哥伦比亚尤为重要,因为哥伦比亚有三大构造板块交汇,岩石圈撕裂现象已被记录在案。在本文中,我们将重点阐明板块结构对哥伦比亚中东部浅层和深层热场的影响。为此,我们构建了一系列二维剖面图,并利用保守有限差分法得出了热方程的数值解。作为约束条件,我们根据全球和当地岩石圈厚度模型,推断出了深部地壳和上地幔中的岩石分布。各种岩石的材料参数,包括暴露的和推断的,都是从文献中获得的。此外,我们还使用了哥伦比亚地质调查局编制的表层热流估计值和表观地热梯度。我们的研究结果表明,岩石圈卡尔达斯撕裂对哥伦比亚的热状态有重大影响,断裂发生在北纬 5° 左右东科迪勒拉山脉下的纳斯卡板块。除了东科迪勒拉山脉北部的背景热流迅速增加到 40 mWm-2 以外,模型中的岩石圈热流保持在 25 mWm-2 左右。因此,我们的模型预测卡尔达斯撕裂带以北的下地壳会部分融化,以南的下地壳热不稳定。最符合地表数据的物质参数表明,东拉诺斯盆地存在一个放射性元素含量适度富集的基底。在考虑了压实因素之后,我们还证实了构造环境对沉积盆地热状态的强烈影响。
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The thermal structure of the Colombian lithosphere: A regional and basin-scale analysis

It is well-established that the thermal state of the lithosphere strongly influences various regional and local geological processes, including crustal deformation, hydrocarbon maturation, hydrogen generation, and geothermal phenomena. Moreover, the thermal structure exhibits high sensitivity to tectonic features, a property of particular significance in Colombia, where three main tectonic plates converge, and lithospheric tearing has been documented. In this contribution, we focus on elucidating the impact of plate architecture on the thermal field in central-eastern Colombia at both shallow and deep levels. To accomplish this, we constructed a series of two-dimensional profiles and derived a numerical solution of the heat equation using the conservative finite difference method. As constraints, we incorporate an inferred distribution of rocks in the deep crust and upper mantle based on global and local lithospheric thickness models. Material parameters for the various rocks, both exposed and inferred, were obtained from the literature. Additionally, we used superficial heat flow estimates and apparent geothermal gradients compiled by the Colombian Geological Survey.

Our results suggest a significant influence of the lithospheric Caldas tear on the thermal state of Colombia, with the breaking off occurring in the Nazca plate under the Eastern Cordillera range around 5°N. The modeled asthenospheric heat flow remains approximately 25 mWm−2, except in the northern Eastern Cordillera range, where the background heat flow increases rapidly to 40 mWm−2. Consequently, our model predicts partial melting in the lower crust to the north and a thermally unstable lower crust to the south of the Caldas tear. The material parameters that best fit the surface data suggest the presence of a basement moderately enriched in radioactive elements in the Eastern Llanos basin. After accounting for compaction, we also confirm a strong influence of the tectonic setting on the thermal state of sedimentary basins.

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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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