TY - JOUR
T1 - Unique marine Permian-Triassic boundary section from Western Australia
AU - Thomas, B.M.
AU - Willink, R.J.
AU - Grice, K.
AU - Twitchett, R.J.
AU - Purcell, R.R.
AU - Archbold, N.W.
AU - George, Annette
AU - Tye, S.
AU - Alexander, R.
AU - Foster, C.B.
AU - Barber, C.J.
PY - 2004
Y1 - 2004
N2 - A unique marine Permian-Triassic boundary section containing rich oil source rocks has been continuously cored in a petroleum borehole from the Perth Basin of Western Australia, Such sequences, which provide a biostratigraphic and environmental record at the time of the largest extinction event of the post 500 million years, are globally rare, and this is the first to be documented in Australia. Throughout geological history there have been periods of global marine anoxia that commonly resulted in the widespread deposition of petroleum source rocks, most notably in the mid-Cretaceous and Late Jurassic. An apparent paradox is that, previously, source rocks have not been recognised in association with the Permian-Triassic boundary, despite widespread marine anoxia at this time. The Perth Basin source rocks contain abundant and unusual biomarkers, apparently related to the highly specialised and limited biota that flourished in the aftermath of the end-Permian extinction event. Local conditions may have favoured source-rock development, either due to higher productivity resulting from coastal upwelling or through enhanced preservation under strongly anoxic conditions.
AB - A unique marine Permian-Triassic boundary section containing rich oil source rocks has been continuously cored in a petroleum borehole from the Perth Basin of Western Australia, Such sequences, which provide a biostratigraphic and environmental record at the time of the largest extinction event of the post 500 million years, are globally rare, and this is the first to be documented in Australia. Throughout geological history there have been periods of global marine anoxia that commonly resulted in the widespread deposition of petroleum source rocks, most notably in the mid-Cretaceous and Late Jurassic. An apparent paradox is that, previously, source rocks have not been recognised in association with the Permian-Triassic boundary, despite widespread marine anoxia at this time. The Perth Basin source rocks contain abundant and unusual biomarkers, apparently related to the highly specialised and limited biota that flourished in the aftermath of the end-Permian extinction event. Local conditions may have favoured source-rock development, either due to higher productivity resulting from coastal upwelling or through enhanced preservation under strongly anoxic conditions.
U2 - 10.1111/j.1400-0952.2004.01066.x
DO - 10.1111/j.1400-0952.2004.01066.x
M3 - Article
SN - 0812-0099
VL - 51
SP - 423
EP - 430
JO - Australian Journal of Earth Sciences
JF - Australian Journal of Earth Sciences
IS - 3
ER -