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Quantitative 3D Modeling and Interpretation of High-Resolution Aeromagnetic Data Over Superstition Hills and Superstition Mountain, Imperial Valley, California

机译:加利福尼亚帝国谷迷信山和迷信山上高分辨率航空电磁数据的定量3D建模和解释

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In November 2012, a high-resolution aeromagnetic survey was flown over the Naval Air Facility El Centro, California (NAFEC), to continue geothermal exploration of the Superstition Mountain and Superstition Hills. Data were collected by EDCON-PRJ, INC. and the inversion and analysis was performed by Wintermoon Geotechnologies, Inc. The analysis and interpretation indicated that granite and granodiorite bodies comprising Superstition Mountain have extremely low magnetic susceptibilities. The remainder of the survey area is underlain by basement of a much more iron-rich rock based on magnetic properties, suggesting a more mafic composition. Previous exploration using ground gravity at Superstition Mountain demonstrated a Northwest trending high gravity anomaly where there is a low in the aeromagnetic data. Also, previous mapping of acoustic basement and seismic activity are very similar to calculations of basement depth using the high resolution aeromagnetic data. When the aeromagnetic interpretations are compared to magnotelluric surveys (MT), self potential surveys (SP), and geophysical test hole drilling proximal to Superstition Mountain, data suggest that the high temperature anomaly on the northeast range front is controlled by northwest trending faults, however the heat does not seem to extend far perpendicular to strike. More recent exploration by the Navy Geothermal Program Office (GPO) has focused in the Superstition Hills area where interpretations from recently acquired LiDAR and aeromagnetic data suggest coincident geothermal exploration targets. These interpretations paired with 2-meter temperature probe data and relocated regional earthquake catalogues relative to mapped fault zones suggest certain areas within the Superstition Hills may have geothermal potential.
机译:2012年11月,在加利福尼亚州埃尔森特罗的海军航空装置(NAFEC)上进行了高分辨率的航空电磁测量,以继续对迷信山和迷信山进行地热勘探。数据由EDCON-PRJ,INC。收集,反演和分析由Wintermoon Geotechnologies,Inc.进行。分析和解释表明,组成Superstition Mountain的花岗岩和花岗闪长岩体的磁化率极低。根据磁性,调查区域的其余部分被地下一层铁含量更高的富含铁的岩石所覆盖,这表明镁铁质成分更多。先前在迷信山使用地心引力进行的勘探显示出西北趋势的高重力异常,其中航空磁数据很低。同样,以前的声学地下室和地震活动测绘与使用高分辨率航空磁数据的地下室深度计算非常相似。将航空磁学解释与大地电磁测量(MT),自电势测量(SP)和迷信山附近的地球物理测试孔钻孔进行比较时,数据表明东北范围锋面的高温异常受西北趋势断层控制,但是热量似乎并没有延伸到垂直于罢工的垂直方向。海军地热计划办公室(GPO)最近进行的勘探主要集中在迷信山地区,该地区最近获得的LiDAR和航空磁数据的解释表明地热勘探目标重合。这些解释与2米温度探测器数据以及相对于已绘制断层带的重新布置的区域地震目录相结合,表明迷信山内的某些区域可能具有地热潜力。

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