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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >'Imaging' the cross section of oceanic lithosphere: The development and future of electrical microresistivity logging through scientific ocean drilling
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'Imaging' the cross section of oceanic lithosphere: The development and future of electrical microresistivity logging through scientific ocean drilling

机译：“想象”海洋岩石圈的横截面：通过科学的海洋钻探测微电阻率的发展和未来

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摘要

A detailed understanding of the architecture of volcanic and magmatic lithologies present within the oceanic lithosphere is essential to advance our knowledge of the geodynamics of spreading ridges and subduction zones. Undertaking sub-meter scale observations of oceanic lithosphere is challenging, primarily because of the difficulty in direct continuous sampling (e.g., by scientific ocean drilling) and the limited resolution of the majority of geophysical remote sensing methods. Downhole logging data from drillholes through basement formations, when integrated with recovered core and geophysical remote sensing data, can provide new insights into crustal accretion processes, lithosphere hydrogeology and associated alteration processes, and variations in the physical properties of the oceanic lithosphere over time. Here, we introduce an alternative approach to determine the formation architecture and lithofacies of the oceanic sub-basement by using logging data, particularly utilizing downhole microresistivity imagery (e.g. Formation MicroScanner (FMS) imagery), which has the potential to become a key tool in deciphering the high-resolution internal architecture of the intact upper ocean crust. A novel ocean crust lithostratigraphy model based on meticulously deciphered lava morphology determined by in situ FMS electrofacies analysis of holes drilled during Ocean Drilling Program legs (1) advances our understanding of ocean crust formation and accretionary processes over both time and space; and (2) allows the linking of local igneous histories deciphered from the drillholes to the regional magmatic and tectonic histories. Furthermore, microresistivity imagery can potentially allow the investigation of (i) magmatic lithology and architecture in the lower ocean crust and upper mantle; and, (ii) void space abundances in crustal material and the determination of complex lithology-dependent void geometries.
机译：对海洋岩石圈内存在的火山和岩浆岩性结构的详细了解，对于增进我们对扩散脊和俯冲带地球动力学的认识至关重要。主要由于直接连续采样（例如通过科学海洋钻探）的困难以及大多数地球物理遥感方法的分辨率有限，对海洋岩石圈进行亚米级规模的观测具有挑战性。从钻孔到地下地层的井下测井数据与回收的岩心和地球物理遥感数据集成后，可以提供有关地壳增生过程，岩石圈水文地质学和相关蚀变过程以及海洋岩石圈物理特性随时间变化的新见解。在这里，我们介绍了一种替代方法，可通过使用测井数据来确定海洋地下层的构造和岩相，特别是利用井下微电阻率图像（例如，地层微扫描仪（FMS）图像），这有可能成为该领域的关键工具。破译完整的上洋壳的高分辨率内部结构。一种新颖的大洋地壳岩石地层学模型，该模型基于通过海洋钻探计划航程中钻出的孔的原位FMS电相分析确定的精心破解的熔岩形态（1），使我们对时间和空间上的大洋地壳形成和增生过程有了更深入的了解; （2）允许将从钻孔中破译的当地火成岩历史与区域岩浆和构造历史联系起来。此外，微电阻率成像可能会允许进行以下研究：（i）下洋壳和上地幔的岩浆岩性和构造; （ii）地壳材料中的空隙空间丰度，以及与岩性有关的复杂空隙几何形状的确定。

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