Abstract. Two high-resolution seismic reflection profiles acquired north and south of Chibougamau, located in the northeast of the Abitibi subprovince of Canada help understand historic volcanic-hosted massive sulfide (VMS) deposits and hydrothermal Cu-Au mineralization found there. Major faults crossed by the profiles include the Barlow fault in the north and the Doda fault and the Guercheville fault in the south, all targets of this study that seeks to determine spatial relationships with known metal endowment in the area. Common-offset DMO corrections and common-offset pre-stack time migrations (PSTM) were considered. Irregularities of the trace midpoint distribution resulting from the crooked geometry of both profiles and their relative contribution to DMO and PSTM method and seismic illumination were assessed in the context of the complex subsurface architecture of the area. To scrutinize this contribution, seismic images were generated for offset ranges of 0–9 km using increments of 3 km. Migration of out-of-plane reflections used cross-dip element analysis to accurately estimate the fault dip. The seismic imaging shows the thickening of the upper crustal rocks near the fault zones along both profiles. In the north seismic reflection section, key geological structure identified include the Barlow fault and two diffraction sets imaged within the fault zone that represent potential targets for future exploration. The south seismic reflection section shows rather a complicated geometry of two fault systems. The Guercheville fault observed as a subhorizontal reflector connects to a steeply dipping reflector. The Doda fault dips subvertical in the shallow crust but as a steeply dipping reflection set at depth. Nearby gold showings suggest that these faults may help channel and concentrate mineralizing fluids.

中文翻译：

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Abitibi绿岩带跨断层系统的地震成像–加拿大魁北克Chibougamau地区叠前和叠后偏移方法的分析

摘要。位于加拿大阿比蒂比省东北部的奇布加高北部和南部获得的两个高分辨率地震反射剖面有助于了解历史悠久的火山成岩块状硫化物（VMS）矿床和那里发现的热液性Cu-Au矿化。剖面所跨越的主要断层包括北部的Barlow断层和南部的Doda断层以及Guercheville断层，本研究的所有目标都是试图确定该地区与已知金属spatial赋的空间关系。考虑了通用偏移DMO校正和通用偏移叠前时间迁移（PSTM）。在该地区复杂的地下建筑背景下，评估了这两种剖面的弯曲几何形状导致的痕迹中点分布的不规则性及其对DMO和PSTM方法以及地震照明的相对贡献。为了仔细检查这一贡献，使用3 km的增量生成了0–9 km偏移范围的地震图像。平面外反射的迁移使用交叉倾角元素分析来准确估算断层倾角。地震成像表明，沿两个剖面断层带附近的上地壳岩石都在增厚。在北部地震反射段，确定的关键地质结构包括巴洛断层和断层带内成像的两个衍射集，它们代表了未来勘探的潜在目标。南地震反射部分显示了两个断层系统的复杂几何形状。观察到的Guercheville断层是一个水平下反射器，连接到一个陡倾的反射器。Doda断层在浅地壳中垂直下倾，但在深度处为陡倾反射。附近的金矿显示表明这些断层可能有助于引导和浓缩矿化液。