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Faulted shales and sandstones at Capital Hill unconformity, Canberra, Australia.
#tectonictuesday pic.twitter.com/1psPjJGwmU
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Long overdue offering for
@tectonictweets#tectonictuesday is the massively bedded calcareous Scala dei Murchi marls in Southern Sicily. For scale spot the people! pic.twitter.com/bLo6f47rjR
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The spectacular Variscan folds in Carboniferous limestone at Loughshinny Beach, North Co. Dublin. (Don't overlook the neat unconformity to the Quaternary overburden!)
#TectonicTuesday pic.twitter.com/5ThRYh8K2a
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#tectonictuesday I thought an early overfold might be useful this week@tectonictweets @kingoscarfjordpic.twitter.com/uOsbNgMXpd
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Folded Silurian sediments found near Woburn House, Millisle, Co. Down
#TectonicTuesday pic.twitter.com/ZMcKKG1C7g
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#TectonicTuesday from Bergen (Norway): sigmoidal ductile deformation followed by brittle deformation in schist roadside outcrop. pic.twitter.com/up1W8cuo8l
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Locals call this spectacular sea stack ‘the chimney'. It’s a resistant mafic igneous dyke that cuts across the sedimentary rocks. You can find it in a rocky bay near Spillar’s Cove, part of the Spillars Cove-English Harbour fault zone
#TectonicTuesday Photo credit:@kathistaceypic.twitter.com/YturWaWz0v
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#TectonicTuesday Chemical reactions between rocks & fluid drastically change how rocks deform! This serpentine (dark) has metasomatised to tremolite (light), a harder and tougher mineral, resulting in discrete cataclastic slip surfaces in a rock that otherwise deforms ductilely!! pic.twitter.com/rWS1iq1HB9
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#tectonictuesday High-temperature deformation during emplacement of a pluton in the Vedrette di Ries tonalite (eastern Alps, Italy). The boudinaged tonalite apophysis is wrapped by highly foliated biotite paragneisses containing syntectonic sillimanite. pic.twitter.com/PoMJeJyqlX
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Recently had the opportunity to revisit the North
#Cornwall coastline - the surf was choppy, but the#geology was fantastic as ever! Large-scale chevron#folding in deepwater sandstones & shales, with some very interesting small-scale#structures too...#tectonictuesday pic.twitter.com/4N2i06YmLC
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#TectonicTuesday - some lovely offset (micro-faulted?) polysynthetic twinning in plagioclase feldspar from a pegmatite in the Loch Maree Group, north-west Highlands of Scotland. pic.twitter.com/OdmdUV4aip
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Happy
#TectonicTuesday, it's time for#SuperpositionPuzzle! You will have until Wed ~10p ET. Patterns do not represent rock type or textural information. Wobbles = my unsteady hand, not intrinsic structure. Vote in the tweet below & have fun!pic.twitter.com/M27RVWVaFC
Prikaži ovu nit -
I know this pocket size flexural-slip duplexes within Bude Formation is a bit late for
#TectonicTuesday. Or maybe just put it in#ThrustFaultThursdaypic.twitter.com/xGVl8tsqky
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Death Valley truly is an amazing geologists playground and for me the Low Angle Normal Faults (LANFS) are the highlight
#TectonicTuesday pic.twitter.com/gOn8LItqvV
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Nice refolded fold in Fraserburgh.
#tectonictuesday#dalradian#buchan#thebrochpic.twitter.com/AGOY5w7NLo
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Kink bands in Kearney Siltstone Formation (Hawick Group) at Kearney Point, Co. Down
#TectonicTuesday pic.twitter.com/9UvSJYSudo
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Faulted Palaeogene basalt lava flows at Cornamucklagh Quarry just outside Portadown, Co. Armagh.
#TectonicTuesday pic.twitter.com/cjH6Aj8QWo
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#TectonicTuesday Margin of a rodingite pod embedded in a serpentinite mélange. The rodignite (grey=hydrogarnet, green=diopside) is shattered w/ multiple generations of fractures and veins, indicating that brittle fracture occurred despite the surrounding serp. deforming ductiley! pic.twitter.com/gdZV5gXXEO
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#TectonicTuesday: Composite layer crosscut by younger pegmatites and displaced by ductile shear zones. Credit: Giorgio Pennacchioni. pic.twitter.com/L8HkpMaDKE
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