Talk:Australasian strewnfield

Co-Dating with Brunhes Matyama Geomagnetic Reversal

According to one published paper the Australasian tektite strewnfield is co-dated with the Brunhes Matyama geomagnetic reversal at 780 K yrs ago. hgwb (talk) 03:53, 25 April 2010 (UTC)

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AA Tektite Impact Crater Rumors "Just off Vietnam Coast" Verified

Among oilmen rumors have been said to circulate for decades that the AA tektite impact crater is "Just off Vietnam Coast." Indeed thanks to a recent high resolution Google Earth map, this crater, a mudwave structure 300 km diameter, has been rather obvious, identical with the Spratlies Archipelago or "Dangerous Ground," centered at 9.9ºN, 114.8ºE. See my article for the details: H.G.W.B., Open Journal of Geology, 2018, vol 8, p.1-8, DOI https://doi.org/10.4236/ojg.2017.72013

The detailed G.E. map shows the cosmic projectile came from the SW taking out a good-size chunk of the submerged Sundaland, which may have been dry at the time 800 ka BP, as readily apparent from the "snowplow" tracks in the SW. This is an essential ingredient of the proof due to the Be10 abundance in the Muong-Nong tektite mineralogy.

The 300 km size seems to be typical for ocean floor mudwave impact structures, also found for the Eltanin crater in the Southern Ocean off the Chile coast. The impact was discovered by Frank Kyte, UCLA, in his MS thesis, cause of his fame among those of us with a life-long interest in impact geology. Please see my abstract from the 2019 GSA Phoenix Conference. hgwb 09:21, 19 February 2020 (UTC) Repeated malfunction of sinebot my official signature is hgwb. Someone please fix sinebot which has been giving me a hard time for years. hgwb 09:27, 19 February 2020 (UTC) hgwb 09:27, 19 February 2020 (UTC) hgwb 09:27, 19 February 2020 (UTC)

Novel explanation for Missing Australasian Tektite Astrobleme and tools to help the community test it

GSA Book SPE553 contains two chapters addressing the missing astrobleme and expected proximal and medial ejecta for the evidenced distal strewn field of Australasian tektites.

Chapter 23 provides a new toolkit for suborbital analysis employing the proper frame-of-reference orbit mechanics for ejecta transport over a rotating planet, the “A to B” problem. One tool allows a user to constrain the combinations of parameters for A (location of launch, azimuth, elevation, velocity) that would deliver ejecta a given location B. Results are provided graphically using plots on globe and projection maps. Chapter 23 is offered by the GSA as Open Source, owing to a positive peer review by Dr. Walter Alvarez, who published similar work while attempting to advance his K-Pg impact theory. [1]https://doi.org/10.1130/2021.2553(23)

Chapter 24 offers the community a decidedly unconventional location for the Australasian Tektite strewn field’s missing correlated astrobleme and missing proximal and medial ejecta. The authors maintain that the event produced a much richer array of consequences than anyone has thus far anticipated, and the current focus on the Australasian region for an a priori designated impact site has stalled progress for 50 years. The paper posits that an impact into the then-present North American continental ice sheet on a very shallow or tangential trajectory had excavated vast quantities of ice prior to reaching competent bedrock. Sediments of the Michigan Basins’s upper-most late Paleozoic to early Metazoic seem to meet the long-standing requirements for Australasian Tektite parent target material. Energy portioning into the ice is credited with minimizing damage to the planet’s environment. A falsification path is suggested, involving 10Be/26Al cosmogenic isotope dating of the depositional time of anomalous regolith blankets observed to be present across North America. [2]https://doi.org/10.1130/2021.2553(24) Cintos (talk) 23:10, 13 October 2022 (UTC)