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Gemology and Jewelry: Gemstones B‑class Low‑importance

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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)[reply]

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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)