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Землю, исследование возможности заблаговременного их обнаружения и
изменения траекторий. Отчёт по НИР, АН СССР ВЦ, Новосибирск , 128 с.
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impacts. 40th ESLAB First International Conference on Impact Cratering
in the Solar System, 8-12 May 2006., Noordwijk,The Netherlands
- Thomas
Kenkmann, Michael Poelchau (2007). Piccaninny, WA, and Matt Wilson, NT:
Two possible complex impact craters in Australia. Goldschmidt Conference
Abstracts 2007, Geochimica et Cosmochimica Acta, 71 (15): Suppl. S, Aug.2007, A477
We present results of field analysis, microscopy, and remote sensing
mapping of two circular structures in Australia of which the meteorite
impact origin is not yet confirmed.
Piccaninny, Western Australia (17 25'S, 128 26'E, 7.5 km diameter):
The circular structure (Beere 1983; Shoemaker and Shoemaker, 1985) forms
a plateau in the Purnululu National Park that is built up by Devonian
conglomerates and sandstones. It is framed by beehive-like domes and the
Piccaninny Gorge, both make the access to the elevated plain difficult.
The structure is defined by a centerward dipping circular monocline
(5-15Ь dip), a very gentle ring syncline, and a weak central rise with a
stratigraphic uplift of 40-50 m. The distinct regional cleavage pattern
outside the plateau displays a systematic deflection towards the center
of the structure. On the plateau the vertical cleavage planes are
reactivated as faults. These fault zones typically contain comminuted
decimeter-wide gouge zones and meter-wide process zones in which
anastomozing subsidiary fault networks occur. Some of the interconnected
shear zones resemble breccia dikes. Strata are offset by faults. Minor
strata tilting and the apparent lack of shock features suggest a
considerable amount of erosion (>2 km) of the possible impact crater.
known from other craters like Upheaval Dome or Spider (Scherler et
al., 2006). The NE-SW trending symmetry axis is delineated by major
faults. The fault pattern, preferred NE strata dipping in the central
uplift, and the elliptical crater outline may indicate an oblique impact
from NE.
Acknowledgements: We would like to thank DFG for funding this project (KE 732-11/1).
(Thomas Kenkmann, Michael Poelchau, 2007).
Спутниковая фотография кратера из Google Earth.
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Bungle Bungle Ranges 4.
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