“Hidden ‘Jurassic World’ Buried Beneath Australia”
Visitor geology/geophysics drive-by by David Middleton
H/T to Dr. Willie Quickly
Cool story, silly headline…
Scientists Discovered a Hidden ‘Jurassic World’ Buried Beneath Australia
The subterranean stays of 100 volcanoes fashioned some 180 million years in the past have been detected below a serious petroleum hotspot.
By Becky Ferreira
Aug 14 2019
A trove of 100 Jurassic-era volcanoes has been found deep beneath a petroleum-rich area of central Australia, in response to a brand new examine.
The traditional volcanoes fashioned between 180 and 160 million years in the past, simply because the prehistoric supercontinent Gondwana—of which Australia was as soon as an element—started to interrupt aside. For millennia, this underground volcanic panorama lay buried underground, eluding detection.
[…]
These deposits have been a hotspot of oil and fuel manufacturing because the 1960s, and the area is at the moment Australia’s largest onshore supply of hydrocarbons, which made the brand new discover significantly shocking.
In line with the examine authors, discovering such an epic volcanic panorama in an space that has already undergone substantial information assortment “raises the prospect of different undiscovered […] volcanic provinces each in Australia and in different continental areas worldwide.”
Some 1,400 oil wells have been drilled on this space over the previous half-century, a few of which turned up igneous rocks that instructed historical lava is likely to be preserved within the sediment.
[…]
Vice
There’s a “Jurassic world” buried below nearly each Cretaceous and youthful “hotspot of oil and fuel manufacturing” on this planet… The Jurassic is nearly at all times under the Cretaceous… except the beds have been overturned, it’s in an overthrust belt or it’s Jurassic-aged cellular salt. The Gulf of Mexico encompasses a Jurassic desert buried 20,000′ under the seafloor, locations the place there are 1,000’s of toes of Jurassic salt above Cenozoic “rocks,” and mysterious volcanoes too… Plus… If the Gulf of Mexico ever froze, there can be sufficient ice to switch the Greenland ice sheet… That’s like eleventy gazillion Olympic-sized swimming swimming pools.
The headline might have been silly, however, the science is approach cool! They have been in a position to make pretty detailed maps of what seem like volcanic options by integrating seismic, gravity and effectively information…
IMAGERY FROM THE GONDWANA RESEARCH PAPER. IMAGE: UNIVERSITY OF ABERDEEN/UNIVERSITY OF ADELAIDE
A pre-print full model of their paper could be accessed right here.
The “Warnie volcanic province” is definitely in between two hydrocarbon basins…
The Cooper and Eromanga Basins of South Australia and Queensland are the most important onshore hydrocarbon producing area in Australia. Igneous rocks have been documented occasionally inside finish of effectively reviews over the previous 34 years, with a late Triassic to Jurassic age decided from effectively information. Nonetheless, the areal extent and nature of those basaltic rocks have been largely unclear. Right here, we combine seismic, effectively, gravity, and magnetic information to make clear the extent and character of igneous rocks preserved inside Eromanga Basin stratigraphy overlying the Nappamerri Trough of the Cooper Basin. We recognise mafic monogenetic volcanoes that stretch into tabular basalt lava flows, igneous intrusions and, extra regionally, hydrothermally altered compound lava flows. The volcanic province covers ~7500 km2 and is proposed to have been energetic between ~180–160 Ma. We time period this Jurassic volcanic province the Warnie Volcanic Province (WVP) after the Warnie East 1 exploration effectively, drilled in 1985. The distribution of extrusive and intrusive igneous rocks is primarily managed by basement construction, with extrusive and intrusive igneous rocks elongate in a NW-SE path. Lastly, we element how the WVP suits into the document of Jurassic volcanism in japanese Australia. The WVP is interpreted as a product of extension and intraplate convective upwelling above the subducting Pacific Slab. The invention of the WVP raises the potential of different, but unidentified, volcanic provinces worldwide.
[…]
Hardman et al., 2019
Simply because I count on this to be talked about in quite a few feedback: No! These will not be the hydrocarbon supply rocks of the Cooper Basin. The Cooper Basin is way older and lies unconformably under the Eromanga Basin.
Kuske et al., 2016
Nor are they the supply rocks for the youthful Eromanga Basin.
Kuske et al., 2016
How might a volcanic subject get between two sedimentary basins?
The San Francisco Peaks of Arizona would possibly simply be a contemporary analogy for the The Warnie Volcanic Province. 10’s of thousands and thousands of years sooner or later, elements of it’d simply be lined by a future sedimentary basin, sandwiched between two basins just like the Warnie Volcanic Province.
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References
Hardman, Jonathon P.A., Simon P. Holford, Nick Schofield, Mark Bunch, Daniel Gibbins, “The Warnie volcanic province: Jurassic intraplate volcanism in Central Australia”. Gondwana Analysis, Quantity 76, 2019,
Pages 322-347, ISSN 1342-937X, https://doi.org/10.1016/j.gr.2019.06.012.
Hardman, Jonathon, Simon Holford, Nick Schofield, Mark Bunch, and Daniel Gibbins. 2018. “The Warnie Volcanic Province: A Jurassic Volcanic Province in Central Australia.” EarthArXiv. December 12. doi:10.31223/osf.io/9zmty.
Kuske, Tehani J., Lisa Corridor, Tony Hill, Alison Troup, Dianne Edwards1, Chris Boreham and Tamara Buckler. “Supply Rocks of the Cooper Basin”. Search and Discovery Article #10829 (2016)**
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