Structure of the crust and upper mantle beneath Bass Strait, southeast Australia, from teleseismic body wave tomography

Mohammed Bello (Corresponding Author), Nicholas Rawlinson, Dave Cornwell, Emily Crowder, Michelle Salmon, Anya M. Reading

Research output: Contribution to journalArticle

Abstract

We present new constraints on the lithospheric velocity structure of Bass Strait and the adjoining landmasses of mainland Australia and Tasmania in order to better constrain their geological and tectonic relationship. This is achieved by performing teleseismic tomography using data from fifteen deployments of WOMBAT and BASS transportable arrays, which span southeastern Australia. The starting model for the teleseismic tomography includes crustal velocity structure constrained by surface waves extracted from ambient seismic noise data and a Moho surface and broad-scale variations in 3-D upper mantle velocity structure from the Australian seismological reference Earth model (AuSREM). As a consequence, we produce a model with a high level of detail in both the crust and upper mantle. Our new results strengthen the argument for a low velocity upper mantle anomaly that extends down to ~150 km depth directly beneath the Newer Volcanics Province in Victoria, which is likely related to recent intra-plate volcanism. Beneath Bass Strait, which is thought to host the entrained VanDieland microcontinent, upper mantle velocities are low relative to those typically found beneath Precambrian continental crust; it is possible that failed rifting in Bass Strait during the Cretaceous, opening of the Tasman Sea, extension of VanDieland during Rodinian break up and recent plume activity in the past 5 Ma may have altered the seismic character of this region. The data nevertheless suggest: (1) the velocity structure of the VanDieland microcontinent lacks continuity within its lithosphere; (2) the Moyston Fault defines an area of strong velocity transition at the boundary between the Cambrian Delamerian Orogen and the Cambrian-Carboniferous Lachlan Orogen; and (3) there is a rapid decrease in mantle velocity inboard of the east coast of Australia, which is consistent with substantial thinning of the lithosphere towards the passive margin.
Original languageEnglish
Article number106276
Number of pages15
JournalPhysics of the Earth and Planetary Interiors
Volume294
Early online date2 Jul 2019
DOIs
Publication statusPublished - Sep 2019

Fingerprint

teleseismic wave
straits
body wave
velocity structure
tomography
strait
upper mantle
crusts
Earth mantle
crust
lithosphere
seismic noise
low speed
passive margin
Moho
Tasmania
surface wave
continental crust
rifting
thinning

Keywords

  • teleseismic tomography
  • body waves
  • surface waves
  • upper mantle
  • Bass Strait
  • southeast Australia

Cite this

Structure of the crust and upper mantle beneath Bass Strait, southeast Australia, from teleseismic body wave tomography. / Bello, Mohammed (Corresponding Author); Rawlinson, Nicholas; Cornwell, Dave; Crowder, Emily; Salmon, Michelle; Reading, Anya M.

In: Physics of the Earth and Planetary Interiors, Vol. 294, 106276, 09.2019.

Research output: Contribution to journalArticle

@article{85cec7071cd0440da4784d289f3ef09d,
title = "Structure of the crust and upper mantle beneath Bass Strait, southeast Australia, from teleseismic body wave tomography",
abstract = "We present new constraints on the lithospheric velocity structure of Bass Strait and the adjoining landmasses of mainland Australia and Tasmania in order to better constrain their geological and tectonic relationship. This is achieved by performing teleseismic tomography using data from fifteen deployments of WOMBAT and BASS transportable arrays, which span southeastern Australia. The starting model for the teleseismic tomography includes crustal velocity structure constrained by surface waves extracted from ambient seismic noise data and a Moho surface and broad-scale variations in 3-D upper mantle velocity structure from the Australian seismological reference Earth model (AuSREM). As a consequence, we produce a model with a high level of detail in both the crust and upper mantle. Our new results strengthen the argument for a low velocity upper mantle anomaly that extends down to ~150 km depth directly beneath the Newer Volcanics Province in Victoria, which is likely related to recent intra-plate volcanism. Beneath Bass Strait, which is thought to host the entrained VanDieland microcontinent, upper mantle velocities are low relative to those typically found beneath Precambrian continental crust; it is possible that failed rifting in Bass Strait during the Cretaceous, opening of the Tasman Sea, extension of VanDieland during Rodinian break up and recent plume activity in the past 5 Ma may have altered the seismic character of this region. The data nevertheless suggest: (1) the velocity structure of the VanDieland microcontinent lacks continuity within its lithosphere; (2) the Moyston Fault defines an area of strong velocity transition at the boundary between the Cambrian Delamerian Orogen and the Cambrian-Carboniferous Lachlan Orogen; and (3) there is a rapid decrease in mantle velocity inboard of the east coast of Australia, which is consistent with substantial thinning of the lithosphere towards the passive margin.",
keywords = "teleseismic tomography, body waves, surface waves, upper mantle, Bass Strait, southeast Australia",
author = "Mohammed Bello and Nicholas Rawlinson and Dave Cornwell and Emily Crowder and Michelle Salmon and Reading, {Anya M.}",
note = "Acknowledgments We thank many land owners and field team members from mainland Australia and Tasmania. Particular thanks to Armando Arcidiaco and Qi Li from ANU for assistance with the collection and archiving of the data used in this study. ARC grants DP120103673, LE120100061, LP110100256 and DP0986750 were instrumental in supporting the WOMBAT and BASS deployments.",
year = "2019",
month = "9",
doi = "10.1016/j.pepi.2019.106276",
language = "English",
volume = "294",
journal = "Physics of the Earth and Planetary Interiors",
issn = "0031-9201",
publisher = "Elsevier",

}

TY - JOUR

T1 - Structure of the crust and upper mantle beneath Bass Strait, southeast Australia, from teleseismic body wave tomography

AU - Bello, Mohammed

AU - Rawlinson, Nicholas

AU - Cornwell, Dave

AU - Crowder, Emily

AU - Salmon, Michelle

AU - Reading, Anya M.

N1 - Acknowledgments We thank many land owners and field team members from mainland Australia and Tasmania. Particular thanks to Armando Arcidiaco and Qi Li from ANU for assistance with the collection and archiving of the data used in this study. ARC grants DP120103673, LE120100061, LP110100256 and DP0986750 were instrumental in supporting the WOMBAT and BASS deployments.

PY - 2019/9

Y1 - 2019/9

N2 - We present new constraints on the lithospheric velocity structure of Bass Strait and the adjoining landmasses of mainland Australia and Tasmania in order to better constrain their geological and tectonic relationship. This is achieved by performing teleseismic tomography using data from fifteen deployments of WOMBAT and BASS transportable arrays, which span southeastern Australia. The starting model for the teleseismic tomography includes crustal velocity structure constrained by surface waves extracted from ambient seismic noise data and a Moho surface and broad-scale variations in 3-D upper mantle velocity structure from the Australian seismological reference Earth model (AuSREM). As a consequence, we produce a model with a high level of detail in both the crust and upper mantle. Our new results strengthen the argument for a low velocity upper mantle anomaly that extends down to ~150 km depth directly beneath the Newer Volcanics Province in Victoria, which is likely related to recent intra-plate volcanism. Beneath Bass Strait, which is thought to host the entrained VanDieland microcontinent, upper mantle velocities are low relative to those typically found beneath Precambrian continental crust; it is possible that failed rifting in Bass Strait during the Cretaceous, opening of the Tasman Sea, extension of VanDieland during Rodinian break up and recent plume activity in the past 5 Ma may have altered the seismic character of this region. The data nevertheless suggest: (1) the velocity structure of the VanDieland microcontinent lacks continuity within its lithosphere; (2) the Moyston Fault defines an area of strong velocity transition at the boundary between the Cambrian Delamerian Orogen and the Cambrian-Carboniferous Lachlan Orogen; and (3) there is a rapid decrease in mantle velocity inboard of the east coast of Australia, which is consistent with substantial thinning of the lithosphere towards the passive margin.

AB - We present new constraints on the lithospheric velocity structure of Bass Strait and the adjoining landmasses of mainland Australia and Tasmania in order to better constrain their geological and tectonic relationship. This is achieved by performing teleseismic tomography using data from fifteen deployments of WOMBAT and BASS transportable arrays, which span southeastern Australia. The starting model for the teleseismic tomography includes crustal velocity structure constrained by surface waves extracted from ambient seismic noise data and a Moho surface and broad-scale variations in 3-D upper mantle velocity structure from the Australian seismological reference Earth model (AuSREM). As a consequence, we produce a model with a high level of detail in both the crust and upper mantle. Our new results strengthen the argument for a low velocity upper mantle anomaly that extends down to ~150 km depth directly beneath the Newer Volcanics Province in Victoria, which is likely related to recent intra-plate volcanism. Beneath Bass Strait, which is thought to host the entrained VanDieland microcontinent, upper mantle velocities are low relative to those typically found beneath Precambrian continental crust; it is possible that failed rifting in Bass Strait during the Cretaceous, opening of the Tasman Sea, extension of VanDieland during Rodinian break up and recent plume activity in the past 5 Ma may have altered the seismic character of this region. The data nevertheless suggest: (1) the velocity structure of the VanDieland microcontinent lacks continuity within its lithosphere; (2) the Moyston Fault defines an area of strong velocity transition at the boundary between the Cambrian Delamerian Orogen and the Cambrian-Carboniferous Lachlan Orogen; and (3) there is a rapid decrease in mantle velocity inboard of the east coast of Australia, which is consistent with substantial thinning of the lithosphere towards the passive margin.

KW - teleseismic tomography

KW - body waves

KW - surface waves

KW - upper mantle

KW - Bass Strait

KW - southeast Australia

UR - https://linkinghub.elsevier.com/retrieve/pii/S0031920119300524

UR - http://www.mendeley.com/research/structure-crust-upper-mantle-beneath-bass-strait-southeast-australia-teleseismic-body-wave-tomograph

UR - https://abdn.pure.elsevier.com/en/en/researchoutput/structure-of-the-crust-and-upper-mantle-beneath-bass-strait-southeast-australia-from-teleseismic-body-wave-tomography(85cec707-1cd0-440d-a478-4d289f3ef09d).html

U2 - 10.1016/j.pepi.2019.106276

DO - 10.1016/j.pepi.2019.106276

M3 - Article

VL - 294

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

SN - 0031-9201

M1 - 106276

ER -