加纳纳西亚次盆地三维地质模型的新区域地层学见解，该模型基于最初为矿产勘查收集的再处理B场数据，为水文地质目的而开发
New regional stratigraphic insights from a 3D geological model of the Nasia sub-basin, Ghana, developed for hydrogeological purposes and based on reprocessed B-field data originally collected for mineral exploration
摘要：
区域尺度航空电磁数据（AEM）的再处理是用来建立一个三维地质模型的纳西亚次盆地。由此产生的3D地质模型集成了电磁数据、岩性测井和先验地质知识带来的所有先验信息。AEM数据由GEOTEM B场数据组成，最初收集用于矿产勘查。因此，这些B-场数据必须经过（重新）处理和适当反演，因为最初的勘测和数据处理是为了探测潜在的矿产目标，而不是为了详细的地质测绘。这些新的反演提供了不同的地下图像。新的地球物理模型导致了对地质背景的新解释，并导致了盆地全面三维地质模型的构建。从AEM数据可以推断出古河谷系统的证据。这些古河谷的地层学表明，与已知的马里诺事件不同的冰川作用历史，通常与伏尔泰沉积盆地的Kodjari组有关。帕纳博科河内的古河谷的存在可能与斯特阶时代的山地冰川作用有关，尽管尚未确定明确的冰川成因地层。在陶代尼盆地的瓦桑加拉群的岩石中记录了前马里诺冰川作用。马里诺期和可能的斯特期冰川期的组合，都是低温期的，可以是新元古代雪球地球的一个迹象。这些地貌的出现不仅具有重要的社会经济后果-因为古河谷可以作为地下水的蓄水池-而且从科学角度来看，它们可能需要对该地区目前的地层进行修订。
英文摘要：
Reprocessing of regional-scale airborne electromagnetic data (AEM) is used to build a 3D geomodel of the Nasia sub-basin. The resulting 3D geomodel integrates all the prior pieces of information brought by electromagnetic data, lithologic logs, and prior geological knowledge. The AEM data, consisting of GEOTEM B-field data, were originally collected for mineral exploration. Thus, those B-field data had to be (re)processed and properly inverted as the original survey and data handling were designed for the detection of potential mineral targets and not for detailed geological mapping. These new inversions provided a different picture of the subsurface. The new geophysical model led to new interpretations of the geological settings and to the construction of a comprehensive 3D geomodel of the basin. The evidence of a system of paleovalleys could be inferred from the AEM data. The stratigraphy of these paleovalleys suggests a different glaciation history from the known Marinoan events, commonly associated with the Kodjari formation of the Voltaian sedimentary basin. The presence of the paleovalleys within the Panabako may be correlated with mountain glaciation within the Sturtian age, though no unequivocal glaciogenic strata have yet been identified. Pre-Marinoan glaciation is recorded in rocks of the Wassangara group of the Taoudeni Basin. The combination of the Marinoan and, possibly, Sturtian glaciation episodes, both of the Cryogenian period, can be an indication of a Neoproterozoic Snowball Earth. The occurrence of those features not only has important socioeconomic consequences - as the paleovalleys can act as reservoirs for groundwater - but also from a scientific point of view, they could require a revision of the present stratigraphy of the area.
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