AusMoho: the variation of Moho depth in Australia

Abstract

SUMMARY Since 2004 more than 7000 km of full‐crustal reflection profiles have been collected across Australia to give a total of more than 11 000 km, providing valuable new constraints on crustal structure. A further set of hitherto unexploited results comes from 150 receiver functions distributed across the continent, mostly from portable receiver sites. These new data sets provide a dramatic increase in data coverage compared with previous studies, and reveal the complex structure of the Australian continent in considerable detail. A new comprehensive model for Moho depth across Australia and its immediate environment is developed by utilizing multiple sources of information. On‐shore and off‐shore refraction experiments are supplemented by receiver functions from a large number of portable stations and the recently augmented set of permanent stations, and Moho picks from the full suite of reflection transects. The composite data set provides a much denser sampler of most of the continent than before, though coverage remains low in the remote areas of the Simpson and Great Sandy deserts. The various data sets provide multiple estimates of the depth to Moho in many regions and the consistency between the different techniques is high. In a number of instances, differences in estimates of Moho depth can be associated with the aspects of the structure highlighted by the particular methods. The new results allow considerable refinement of the patterns of Moho depth across the continent. Some of the thinnest crust lies beneath the Archean cratons in the Pilbara and the southern part of the Yilgarn. Thick crust is encountered beneath parts of the Proterozoic in Central Australia, and beneath the Palaeozoic Lachlan fold belt in southeastern Australia. The refined data indicate a number of zones of sharp contrast in depth to Moho, notably in the southern part of Central Australia.

The nature of the Moho in Australia from reflection profiling: A review

“…1). The dense sampling provided by the reflection transects has been of considerable value in mapping the character and geometry of the Moho on the continental scale [2,3].…”

Crustal complexity in the Lachlan Orogen revealed from teleseismic receiver functions

“…Most onshore refraction profiles date from the 1960s to 1980s (see e.g. Kennett et al 2011). The crustal structure is constrained in few locations from passive seismic experiment: receiver function (RF) studies (Shibutani et al 1996;Clitheroe et al 2000;Kennett et al 2011).…”

“…Kennett et al 2011). The crustal structure is constrained in few locations from passive seismic experiment: receiver function (RF) studies (Shibutani et al 1996;Clitheroe et al 2000;Kennett et al 2011). An anisotropic upper, middle and lower crust was well imaged in previous seismic reflection data (Direen et al 2001;Glen et al 2002) and the seismic interface between the crust and the mantle was interpreted as not flat Glen et al 2002).…”

Integrated petroleum systems analysis to understand the source of fluids in the Browse Basin, Australia

“…The lower thermal boundary condition was set using a constant temperature at the base of the lithosphere. Crustal structure was estimated from AusMoho (Kennett et al 2011) and subsidence analysis was used to model lithospheric extension through time. Modelling was conducted using the TrinityGenesis-KinEx software suite (http://www.zetaware.com).…”