Abstract

Abstract. Ambient seismic noise tomography is a novel, low-impact method for investigating the earth's structure. Although most passive seismic studies focus on structures on crustal scales, there are only a few examples of this technique being applied in a mineral exploration context. In this study, we performed an ambient seismic experiment to ascertain the relationship between the shallow shear wave velocity and mineralized zones in the Erzgebirge in Germany, one of the most important metal provinces in Europe. Late Variscan mineralized greisen and veins occurring in the Geyer-Ehrenfriedersdorf mining district of the Central Erzgebirge were mined from medieval times until the end of the 19th century. These occurrences represent a significant resource for commodities of high economic importance, such as tin, tungsten, zinc, indium, bismuth and lithium. Based on ambient noise data from a dense “LARGE-N” network comprising 400 low-power, short-period seismic stations, we applied an innovative tomographic inversion technique based on Bayesian statistics (transdimensional, hierarchical Monte Carlo search with Markov Chains using a Metropolis/Hastings sampler) to derive a three-dimensional shear wave velocity model. An auxiliary 3D airborne time-domain electromagnetic dataset is used to provide additional insight into the subsurface architecture of the area. The velocity model shows distinct anomalies down to approximately 500 m depth that correspond to known geological features of the study area, such as (a) gneiss intercalations in the mica schist-dominated host rock, imaged by a SW–NE striking low-velocity zone with a moderately steep northerly dip, and (b) a NW-trending strike-slip fault, imaged as a subvertical linear zone cross-cutting and offsetting this low-velocity domain. Similar to the velocity data, the electromagnetic data exhibit north-dipping (high-conductivity) structures in the mica schists, corresponding to the strike and dip of the predominant metamorphic fabric. An unsupervised classification performed on the bivariate 3D dataset yielded nine spatially coherent classes, one of which shows a high correspondence with drilled greisen occurrences in the roof zone of a granite pluton. The relatively high mean shear velocity and resistivity values of this class could be explained by changes in density and composition during greisen formation, as observed in other areas of the Erzgebirge. Our study demonstrates the great potential of the cost-efficient and low-impact ambient noise technology for mineral exploration, especially when combined with other independent geophysical datasets.

Highlights

  • Passive seismic methods using the ambient seismic noise field have become very popular over the last few years for imaging the earth’s subsurface structure

  • Most passive seismic studies focus on structures on crustal scales, there are only a few examples of this technique being applied in a mineral exploration context

  • Based on ambient noise data from a dense “LARGE-N” network comprising 400 low-power, short-period seismic stations, we applied an innovative tomographic inversion technique based on Bayesian statistics to derive a three-dimensional shear wave velocity model

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Summary

Introduction

Passive seismic methods using the ambient seismic noise field have become very popular over the last few years for imaging the earth’s subsurface structure. The discovery of deriving the Green’s functions between many seismic stations by data cross correlation turned out to be a game changer in seismology (Campillo and Paul, 2003). These Green’s functions correspond to a “virtual source” located at any given seismic station being recorded at all Published by Copernicus Publications on behalf of the European Geosciences Union. T. Ryberg et al.: Ambient seismic noise analysis of LARGE-N data other stations, allowing the velocity structure (and, in turn, the geological structure) to be inferred without earthquake signals or controlled sources necessary for traditional imaging methods (Bensen et al, 2007). Ambient seismic noise analysis has successfully been used in geodynamic investigations (e.g. Green et al, 2020), shallow site characterization (e.g. Hannemann et al, 2014) and geothermal site characterization (Martins et al 2020), applications in mineral exploration are relatively sparse (e.g. Hollis et al, 2018; Da Col et al, 2020; Xie et al, 2021; Colombero et al, 2021)

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