Marine self-potential gradient exploration of the continental margin
作者： Graham Heinson , Antony White , David Robinson , Nader Fathianpour
DOI: 10.1190/1.2057981
关键词: Continental shelf 、 Seismology 、 Amplitude 、 Continental margin 、 Swell 、 Wind wave 、 Potential gradient 、 Seafloor spreading 、 Magnetic anomaly 、 Geology
摘要: The self-potential (SP) method for mineral exploration is seldom used on land, primarily because of electrode noise problems and nonunique interpretations. Marine measurements the horizontal gradient SP field, other hand, are relatively simple to make with an array electrodes towed behind a ship. With low ship speeds 5 10 km/hour, dense spatial sampling (∼1 m) can be obtained resolution better than 1 μV/m. In this paper we report data recorded continental shelf South Australia by approximately 20 m above seafloor. Ocean waves swells periods 15 s yielded large amplitude signals ±20 μV/m, but subseafloor mineralization produced anomalies ±50 μV/m widths 2 km or more in number parallel traverses. Integrating observed gradients along each line delineated up −100 mV. Self-potential magnetic anomaly show limited cor...
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