Yarrabubba - a large, deeply eroded impact structure in the Yilgarn Craton, Western Australia

Details Yarrabubba - a large, deeply eroded impact structure in the Yilgarn Craton, Western Australia Yarrabubba - a large, deeply eroded impact structure in the Yilgarn Craton, Western Australia

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003e%26psl.213..235m&link_type=abstract

Earth and Planetary Science Letters, Volume 213, Issue 3-4, p. 235-247.

Mathematics

Logic

4

Scientific paper

Yarrabubba is a newly discovered impact structure situated within the complex granite-greenstone terrain of the Yilgarn Craton. Shock-metamorphic effects including shatter cones, planar deformation features in quartz grains, and pseudotachylites, were found in deeply eroded Archean granites near Yarrabubba station, southeast of Meekatharra, Western Australia. Aeromagnetic images reveal arcuate demagnetization features at diameters between 11 and 25 km, which roughly correspond to the outcropping of the Yarrabubba Granite, and are centered on a magnetic-high halo around the Barlangi Granophyre (119°50'E, 27°10'S). Rapid-quench textures in the Barlangi Granophyre and its inter-fingering relationships with pseudotachylites suggest that it is an impact melt that was injected into the Yarrabubba Granite and spread along fault discontinuities. Both the potassic Yarrabubba Granite and the felsic Barlangi Granophyre are atypical in the northern Yilgarn, as are the abundant fracturing and frictional melting within the local granitoids. These anomalous geological features associated with shock-metamorphic effects are indicative of a hypervelocity impact origin. The age of the impact is uncertain, but geological and geophysical relationships suggest that the Yarrabubba structure was formed during the early Proterozoic.

Affiliated with

Also associated with

No associations

Rating

Yarrabubba - a large, deeply eroded impact structure in the Yilgarn Craton, Western Australia does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Yarrabubba - a large, deeply eroded impact structure in the Yilgarn Craton, Western Australia, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Yarrabubba - a large, deeply eroded impact structure in the Yilgarn Craton, Western Australia will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1667980