Crustal Heterogeneity and Moho Uplift in the Northern Gawler Craton from Trans-dimensional Bayesian Joint Inversion of Receiver Functions and Surface Wave Dispersion
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ID: 321642
2026
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Abstract
Summary The buried Nawa Domain of the Gawler Craton, Australia, remains poorly understood, with its deep structure and connections to adjacent terranes largely unknown. We apply a trans-dimensional Bayesian joint inversion of receiver functions and surface wave dispersion along the Marla line, a dense passive seismic array that crosses the craton margin, to image a two-dimensional shear wave velocity profile across over 200 km distance and down to 60 km depth. Our model reveals two low-velocity anomalies: within the craton, where Vs is reduced by about 6 per cent, possibly from fault-related fracturing and elevated heat flow; and at the craton margin, where a 7 per cent low-velocity anomaly spans the crust and extends into the upper mantle, likely linked to the Norwest Fault and thick sediments. Moreover, an increased Vp/Vs ratio near the Norwest Fault, generally above the profile median and locally reaching high values of about 1.80–1.85, provides evidence for mantle-derived fluid migration. The Vs model also reveals Moho shallowing by 10-15 km toward the craton margin, from about 50 km beneath the craton interior to 35-40 km beneath the basin. Edge-driven convection caused by lithospheric steps may drive mantle migration along faults and Moho uplift.
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| Authors | Haoran Lin, Peng Guo, Erdinc Saygin, B. L. N. Kennett, Mehdi Tork Qashqai, Lei Xing |
| Journal | geophysical journal international |
| Year | 2026 |
| DOI |
10.1093/gji/ggag290
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| URL | |
| Keywords | Keywords not found |
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