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Abstract

Summary

The Metal Earth project acquired ~1000 km of deep seismic reflection profiles from August to November of 2017. Seismic data acquired in this early stage of the Metal Earth project benefited greatly from recent advances in the petroleum sector as well as those in mineral exploration. Vibroseis methods with both sources and receivers rated down to 5 Hz frequencies generated records with 2.5 Hz signal while continuing to sweep up to 150–200 Hz. Metal Earth regional-scale transects using over 5000 active sensors target mineralizing fluid pathways throughout the crust, whereas higher spatial-resolution reflection and full-waveform surveys target structures at mine camp scales. Because Metal Earth was proposed to map and compare entire Archean ore and geologically similar non-ore systems, regional sections cover the entire crust to the Moho in the Abitibi and Wabigoon greenstone belts of the Superior craton in central Canada. Where the new sections overlap with previous Lithoprobe surveys, a clear improvement in reflector detection and definition is observed. Improvements are here attributed to the increased bandwidth of the signal, better estimates of seismic wave speeds used in processing, and especially pre-stack time migration of the data.

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/content/papers/10.3997/2214-4609.201900973
2019-06-03
2024-04-23

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201900973
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Metal Earth: Acquisition and Preliminary Processing of Seismic Data in the Archean Superior Province of Canada
Conference Proceedings 2019, 1 (2019); https://doi.org/10.3997/2214-4609.201900973
/content/papers/10.3997/2214-4609.201900973
/content/papers/10.3997/2214-4609.201900973
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