Modelling Source Depth and Possible Origin of Magnetic Anomalies Associated with the Yallalie Impact Structure, Perth Basin, Western Australia

Hawke, Philip; Buckingham, Amanda; Dentith, Mike

doi:10.1071/eg06191

Cited by 6 publications

(17 citation statements)

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“…Fault traces previously interpreted from seismic data (Hawke et al. ) match well with fault traces suggested by the simulation, within a 5 km radius (Fig. ).…”

Section: Resultssupporting

confidence: 82%

“…The buried structure appears to be well preserved overall, as interpreted from geophysical surveys and the overlying postimpact sedimentary rocks (Hawke et al. ). This observation has been cited to argue that the Yallalie structure may have formed in a quiescent shallow marine environment and was buried quickly (Dentith et al.…”

Section: Discussionmentioning

confidence: 91%

“…Interpreted fault traces on the seismic line (from Hawke et al. ) were added to the iSALE model at the same location and scale. TWT = two‐way time.…”

Section: Resultsmentioning

confidence: 99%

“…; Hawke et al. ). The target rocks are all sedimentary, and, in general, consist of poorly sorted, interbedded, marine and fluvial sandstone, siltstone, shale, chalk, and glauconitic sandstone (greensand) (Belford ; Playford et al.…”

Section: Introductionmentioning

confidence: 98%

“…Airborne magnetic surveys reveal a 12 km diameter circular feature, consisting of concentric positive magnetic anomalies, further suggesting the presence of a complex structure (Hawke et al. ). Two petroleum exploration wells, Cypress Hill‐1 (Higgins ) and Yalallie‐1 (Economo, unpublished data), were drilled within the structure (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Shocked quartz in polymict impact breccia from the Upper Cretaceous Yallalie impact structure in Western Australia

Cox

Cavosie

Ferrière

et al. 2019

Meteorit & Planetary Scien

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Yallalie is a ~12 km diameter circular structure located ~200 km north of Perth, Australia. Previous studies have proposed that the buried structure is a complex impact crater based on geophysical data. Allochthonous breccia exposed near the structure has previously been interpreted as proximal impact ejecta; however, no diagnostic indicators of shock metamorphism have been found. Here we report multiple (27) shocked quartz grains containing planar fractures (PFs) and planar deformation features (PDFs) in the breccia. The PFs occur in up to five sets per grain, while the PDFs occur in up to four sets per grain. Universal stage measurements of all 27 shocked quartz grains confirms that the planar microstructures occur in known crystallographic orientations in quartz corresponding to shock compression from 5 to 20 GPa. Proximity to the buried structure (~4 km) and occurrence of shocked quartz indicates that the breccia represents either primary or reworked ejecta. Ejecta distribution simulated using iSALE hydrocode predicts the same distribution of shock levels at the site as those found in the breccia, which supports a primary ejecta interpretation, although local reworking cannot be excluded. The Yallalie impact event is stratigraphically constrained to have occurred in the interval from 89.8 to 83.6 Ma based on the occurrence of Coniacian clasts in the breccia and undisturbed overlying Santonian to Campanian sedimentary rocks. Yallalie is thus the first confirmed Upper Cretaceous impact structure in Australia.

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“…Fault traces previously interpreted from seismic data (Hawke et al. ) match well with fault traces suggested by the simulation, within a 5 km radius (Fig. ).…”

Section: Resultssupporting

confidence: 82%

Section: Discussionmentioning

confidence: 91%

“…Interpreted fault traces on the seismic line (from Hawke et al. ) were added to the iSALE model at the same location and scale. TWT = two‐way time.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Shocked quartz in polymict impact breccia from the Upper Cretaceous Yallalie impact structure in Western Australia

Cox

Cavosie

Ferrière

et al. 2019

Meteorit & Planetary Scien

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Magnetometric and seismic investigation of the Nova Colinas impact structure, Parnaíba Basin, Brazil

Pereira,

Crósta,

Avona

et al. 2024

Journal of South American Earth Sciences

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Formation of Australasian tektites from gravity and magnetic indicators

Karimi

Kletetschka

Mizera

et al. 2023

Sci Rep

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The parent impact crater of Australasian tektites has not been discovered so far, but a consensus has been accepted on its location in a wider area of Indochina. Recently, an alternative location has been suggested in the Badain Jaran Desert (BJD), Northwest China. Employing gravity and magnetic data derived from satellites, possible presence of an impact structure in BJD is investigated. The gravity parameters include the free air gravity disturbance, its vertical derivative component and total horizontal gradient (THG), strike alignment (SA), and Bouguer anomaly with its first vertical derivative and tilt angle. The magnetic parameters include the anomalous total magnetic field (TMF), its reduced to the pole transformation (RTP), the first vertical derivative of the TMF vertical component (Bzz), tilt angle (TA), and logistic total horizontal gradient (LTHG). Both the gravity and magnetic indicators support the presence of the impact structure. Gravity parameters display typical annular gravity highs circumscribing a gravity low. SA analysis reveals preferred parallel directions, implying the susceptibility of special zones to the impact shock waves, both within and beyond the rim. TMF reveals a large magnetic anomaly in the southern part of the proposed crater, and RTP displaces and restricts it further into the rim. Bzz weakens the long wavelength anomalies, amplifies the superficial ones, and separates them horizontally. TA and LTHG delineate the deep-seated and shallow magnetic signals related to the peak and border magnetization, respectively.

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Modelling Source Depth and Possible Origin of Magnetic Anomalies Associated with the Yallalie Impact Structure, Perth Basin, Western Australia

Cited by 6 publications

References 0 publications

Shocked quartz in polymict impact breccia from the Upper Cretaceous Yallalie impact structure in Western Australia

Shocked quartz in polymict impact breccia from the Upper Cretaceous Yallalie impact structure in Western Australia

Magnetometric and seismic investigation of the Nova Colinas impact structure, Parnaíba Basin, Brazil

Formation of Australasian tektites from gravity and magnetic indicators

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