Callan Bentley is Associate Professor of Geology at Piedmont Virginia Community College in Charlottesville, Virginia. He is a Fellow of the Geological Society of America. For his work on this blog, the National Association of Geoscience Teachers recognized him with the James Shea Award. He has also won the Outstanding Faculty Award from the State Council on Higher Education in Virginia, and the Biggs Award for Excellence in Geoscience Teaching from the Geoscience Education Division of the Geological Society of America. In previous years, Callan served as a contributing editor at EARTH magazine, President of the Geological Society of Washington and President the Geo2YC division of NAGT.
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I did a week of field work near this one:
What’s going on to the west side of that red/green rock cored syncline in #2? It looks like some sort of disconformity but then I looked closer (and man, does that rock redden up) and it appears that the synclinal axis suddenly getts smashed up against “something” – possibly a fault of a different trend than the folding? Could be a folded thrust in the mix??
Ok… looked at my map of Pakistan and the core of that syncline is Miocene-Oligocene (M/O) and there is a fault there on the west that is possibly reverse (thrust?) faulting Oligocene-Eocene (O/E) age rocks over the M/O. But the synform continues west and you get back into the M/O sequence.
And the M/O syncline is bounded by faults to both the north and south. Although the southern fault plays out as you go east. But the northern one has Eocene age rocks up on the M/O to the east. So I’m guessing the thrusting is from north to south, even though there is a east-west trending Jurassic/Triassic cored anticlinorium to the south.
There’s some serious controls going on there trending west-southwest from where that syncline gets truncated by the fault off toward the city of Quetta, the J/Tr anticlinorium get smooshed up against the trend and it includes some intrusions along the way.
I’m stopping…. LOL!
I’m so glad you asked – there’s really cool stuff there. I hadn’t paid any attention when I snapped this image – but I think I’ll dedicate next week’s Friday fold to exploring the mysteries of that location…
The last picture (the one without the latitude/longitude) was WhereOnGoogleEarth#340. http://pluffi.smugmug.com/Landscapes/WoGE/4206594_2fxvWS#!i=1777812713&k=CpFMpfC
Ron Schott who found it (I still remember he was 1 hour or so faster than me) gave this explanation:
-18.0556, 126.5107 Kimberly Region, Western Australia.
Five prominent roughly N-S trending left-lateral strike-slip faults offset E-W striking Paleoproterozoic sedimentary and volcanic rocks deformed by the King Leopold Orogeny. From North to south the rocks exposed in the field of view are the Marboo Fm. (psammite and phyllite, interlayered), Speewah Group (sedimentary siliciclastic), Hart Dolerite, and King Leopold Sandstone. There is apparently uranium exploration in the area (http://www.regalpointresources.com.au/projects/king-leopold/).
Cool. I shouldn’t be surprised that someone else found it already – such a photogenic structure.