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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 >Deep seismic reflection profiling in the Archaean northeastern Yilgarn Craton, Western Australia: implications for crustal architecture and mineral potential
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Deep seismic reflection profiling in the Archaean northeastern Yilgarn Craton, Western Australia: implications for crustal architecture and mineral potential

机译：西澳大利亚州古生界东北的伊尔加恩·克拉顿的深地震反射剖面：对地壳建筑和矿产潜力的影响

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摘要

Deep seismic reflection data across the Archaean Eastern Goldfields Province, northeastern Yilgarn Craton, Western Australia, have provided information on its crustal architecture and on several of its highly mineralised belts. The seismic reflection data allow interpretation of several prominent crustal scale features, including an eastward thickening of the crust, subdivision of the crust into three broad layers, the presence of a prominent east dip to the majority of the reflections and the interpretation of three east-dipping crustal-penetrating shear zones. These east-dipping shear zones are major structures that subdivide the region into four terranes. Major orogenic gold deposits in the Eastern Goldfields Province are spatially associated with these major structures. The Laverton Tectonic Zone, for example, is a highly mineralised corridor that contains several world-class gold deposits plus many smaller deposits. Other non crustal-penetrating structures within the area do not appear to be as well endowed metallogenically as the Laverton structure. The seismic reflection data have also imaged a series of low-angle shear zones within and beneath the granite-greenstone terranes. Where the low-angle shear zones intersect the major crustal-penetrating structures, a wedge shaped geometry is formed. This geometry forms a suitable fluid focusing wedge in which upward to subhorizontal moving fluids are focused and then distributed into the nearby complexly deformed greenstones. Crown Copyright (C) 2004 Published by Elsevier B.V. All rights reserved.
机译：西澳大利亚州Yilgarn Craton东北的古生界东部金矿区省的深层地震反射数据提供了有关其地壳构造和一些高度矿化带的信息。地震反射数据可以解释几个显着的地壳尺度特征，包括地壳向东增厚，地壳细分成三个宽层，大部分反射存在显着的东倾和三个东向的解释。浸透地壳的剪切带。这些向东倾斜的剪切带是将该区域细分为四个地形的主要结构。东部金矿省的主要造山金矿在空间上与这些主要构造有关。例如，拉弗顿构造带是一个高度矿化的走廊，其中包含一些世界一流的金矿床以及许多较小的矿床。该区域内其他非地壳穿透结构在矿物学上似乎不如拉弗顿结构具有天赋。地震反射数据还对花岗岩-绿岩地形内部和下方的一系列低角度剪切带成像。在低角度剪切带与主要地壳穿透结构相交的地方，形成了楔形几何形状。这种几何形状形成合适的流体聚焦楔，其中向上至水平以下的运动流体聚焦，然后分布到附近的复杂变形的绿岩中。官方版权（C）2004，Elsevier B.V.保留所有权利。

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