Australasian strewn field - Impact Deposit

Alternate Names Australites, Indochinites, Philipinites, Javanites
Coordinates 4° 32' 24" N; 99° 45' 36" E
Notes
  1. Map of strewn field areas in Glass, 1990;
Country Indonesia

Related Countries :
  1. Australia
  2. Cambodia
  3. China
  4. Indonesia
  5. Laos
  6. Malaysia
  7. Philippines
  8. Thailand
  9. Vietnam
Region Oceania
Date Confirmed 1900
Notes
  1. These tektites were first discovered described by Darwin in 1851 and over the next hundred years, there was much disagreement within the scientific community over their origin. Seuss, 1900 seems to be the first to suggest that tektites are of impact origin.
Age (Ma) 0.79
Notes :
  1. (Izett and Obradovich 1992; Kunz et al., 1995; Yamei et al., 2000). Stratigraphy- relative to the Brunhes-Matuyama boundary, microtektite layer predates the magnetic reversal by approx. 15 ka (Lee and Wei, 2000)

Method :
  1. 40Ar/39Ar dating and stratigraphic dating
Impactor Type Non-carbonaceous chondrite
Notes
  1. Folco et al., 2018

Advanced Data Fields

Notes

Local Language
N/A
Spherules
Unknown
Tektites
Yes
Indivudual Glass Clasts
Unknown
Source Crater
Unknown, possibly in Indochina
  1. Unknown, possibly in Indochina (Glass and Pizzuto, 1994; Lee and Wei, 2000; Ma et al., 2004; Glass and Koeberl, 2006; Prasad et al., 2007; Folco et al., 2010). Most recent evidence suggests in a volcanic field in Southern Laos (Sieh et al., 2020)
Geology
Microtektite layer occurs at or above Brunhes-Matuyama reversal boundary
  1. Lee and Wei, 2000
Other Shock Metamorphism
Unknown
Shatter Cones
No
Planar Fractures
No
Planar Deformation Features
No
  1. Glass and Fries, 2008; Glass and Simonson, 2012
Diaplectic Glass
No
Coesite
Yes
  1. Found in Muong Nong-type tektites from Phaend Dang, Thailand (Walter, 1965) and microtektites from the South China Sea (Glass and Fries, 2008)
Stisovite
Yes
  1. Glass and Wu, 1993

References

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F E Suess (1900) Die Herkunft der Moldavite und verwandter Gläser, Geologischen Reichsanstalt 50, p. 193-382, url

L S Walter (1965) Coesite discovered in tektites, Science 147(3661), p. 1029-1032, American Association for the Advancement of Science, url, doi:10.1126/science.147.3661.1029

B P Glass (1990) Tektites and microtektites: Key facts and inferences, Tectonophysics 171, p. 393-404, url

G.~A. Izett, J.~D. Obrandovich (1992) Laser-Fusion 40Ar/39 Age of Australasian Tektites, Lunar and Planetary Science Conference 23, p. 593

B P Glass, J Wu (1993) Coesite and shocked quartz discovered in the Australasian and North American microtektite layers, Geology 21, p. 435-438, url

B P Glass, J E Pizzuto (1994) Geographic variation in Australasian microtektite concentrations: Implications concerning the location and size of the source crater, Journal of Geophysical Research 99, p. 19075-19081, url, doi:10.1029/94je01866

J Kunz, K Bollinger, E.~K. Jessberger, D Storzer (1995) Ages of Australasian Tektites, Lunar and Planetary Science Conference 26, p. 809

M Y Lee, K Y Wei (2000) Australasian microtektites in the South China Sea and the West Philippine Sea: Implications for age, size, and location of the impact crater, Meteoritics & Planetary Science 35, p. 1151-1155, University of Arkansas, url, doi:10.1111/j.1945-5100.2000.tb01504.x

Hou Yamei, Richard Potts, Yuan Baoyin, Guo Zhengtang, Alan Deino, Wang Wei, Jennifer Clark, Xie Guangmao, Huang Weiwen (2000) Mid-Pleistocene Acheulean-like Stone Technology of the Bose Basin, South China, Science 287(5458), p. 1622-1626, American Association for the Advancement of Science, url, doi:10.1126/science.287.5458.1622

P Ma, K Aggrey, C Tonzola, C Schnabel, P de Nicola, G F Herzog, J T Wasson, B P Glass, L L Brown, F Tera, R Middleton, J Klein (2004) Beryllium-10 in Australasian tektites: Constraints on the location of the source crater, Geochimica et Cosmochimica Acta 68(19), p. 3883-3896, Pergamon, url, doi:10.1016/j.gca.2004.03.026

B P Glass, C Koeberl (2006) Australasian microtektites and associated impact ejecta in the South China Sea and the Middle Pleistocene supereruption of Toba, Meteoritics & Planetary Science 41, p. 305-326, University of Arkansas, url, doi:10.1111/j.1945-5100.2006.tb00211.x

M S Prasad, V P Mahale, V N Kodagali (2007) New sites of Australasian microtektites in the central Indian Ocean: Implications for the location and size of source crater, Journal of Geophysical Research: Planets 112(E6), p. 1-11, url, doi:10.1029/2006JE002857

B P Glass, M D Fries (2008) Micro-Raman spectroscopic study of fine-grained, shock-metamorphosed rock fragments from the Australasian microtektite layer, Meteoritics & Planetary Science 43(9), p. 1487-1496, University of Arkansas, url, doi:10.1111/j.1945-5100.2008.tb01023.x

L Folco, B P Glass, M D'Orazio, P Rochette (2010) A common volatilization trend in Transantarctic Mountain and Australasian microtektites: Implications for their formation model and parent crater location, Earth and Planetary Science Letters 293(1-2), p. 135-139, url, doi:10.1016/j.epsl.2010.02.037

B P Glass, B M Simonson (2012) Distal impact ejecta layers: Spherules and more, Elements 8(1), p. 43-48, GeoScienceWorld, pdf, doi:10.2113/gselements.8.1.43

L Folco, B P Glass, M D'Orazio, P Rochette (2018) Australasian microtektites: Impactor identification using Cr, Co and Ni ratios, Geochimica et Cosmochimica Acta 222, p. 550-568, Elsevier Ltd, url, doi:10.1016/j.gca.2017.11.017

K Sieh, J Herrin, B Jicha, D S Angel, J D P Moore, P Banerjee, W Wiwegwin, V Sihavong, B Singer, T Chualaowanich, P Charusiri (2020) Australasian impact crater buried under the Bolaven volcanic field, Southern Laos, Proceedings of the National Academy of Sciences of the United States of America 117(3), p. 1346-1353, National Academy of Sciences, url, doi:10.1073/pnas.1904368116

Pierre-Marie Zanetta, Anne-Magali Seydoux-Guillaume, Pierre Rochette, Bruno Reynard, Victor Tricaud, Petanki Soro, Southone Singsoupho, Alain Nicaise Kouamelan, Obrou Monda, David Baratoux (2024) Origin of the Ca-phosphate inclusions in Ivory Coast and Australasian Muong-Nong-type tektites, Geochimica et Cosmochimica Acta 387, p. 63-82, url, doi:https://doi.org/10.1016/j.gca.2024.09.021