#slickensides

48 posts

Mini normal fault found in some fractured mudstone. You can see the slickenlines on the surface! A nice find on the last day of mapping with the class. #fieldwork #mapping #geology #sedimentary #fault #slickensides #saltonsea #mojavedesert #mudstone #rocks
#slickensides or #glacialstriations from thousands of years ago when a kilometre thick ice sheet crept down from the North. #creepy #manitobageology #exploremb @funnyonceaday
Yesterday’s field trip to the Va/WV border on 460 started with the boundary line of the Appalachian Plateau province. Here we have “slickensides” which are polished rock faces resulting from friction along a fault. Just like cross country skiis, it’s easier to move your hand one way along the groves than it is the other. The easier direction of motion is the way the fault moved. #slickensides #iandoesgeology #appalachianplateau #geologicprovince #fault
@muir_ite And I started our 5th #bigwall day 12 pitches up #elcapitan and about 1600’ off the deck. And for the #geology #nerds out there: #slickensides under my @arbpro boot showing that an ancient fault surface forms the famous Peanut Ledge. . . #climbing #rockclimbing #aidclimbing #yosemite #yosemitenationalpark #notdisabled #spinalcordinjury
On Friday 21st September 2018, the AAPGYPTT led a field visit for Schlumberger to the Los Iros Disaster Zone. Their group comprised of individuals with from wireline operations, subsurface, information solutions, facilities managment and even mud engineering. The AAPGYPTT introduced the group to the deformation features that our team has observed in the area since the earthquake. We related the timeline of events and gave possible explanations as to how these features may have formed. The Schlumberger group observed slickensides, offset roadways and farmland, the heavily faulted driveway at the famers house, the thrust deformation on the beach and the evidence of ancient mud flows and ongoing mud volcanism. Simultaneously the AAPG conducted a trial test on using a handheld geiger counter to determine the location of faults. Preliminary results thus far are encouraging - stay tuned for details. The AAPG YP TT thorougly enjoyed hosting Schlumberger for this trip and for the opportunity to have our observations, learnings and models, shared throughout their organisation. We look forward to and will be hosting more groups in the coming weeks! Email us at tt.ypchapter@gmail.com if you wish to tag along on a future visit to the Los Iros area. #aapg #aapgyptt #schlumberger #losiros #earthquake #faults #slickensides #thrustfaults #normalfaults #trinidad
For #mineralmonday here are some #hematite #slickensides from the #paintedhills in #oregon . These formed during faulting of Eocene age laterite soils. Laterites are found in hot and humid tropic environments, and demonstrate that the climate of Oregon was much different than today. Note: this was collected outside of the national monument, collecting at the Painted Hills is illegal. #geologyrocks #geology #fault #minerals #mineralogy #climatechange
This week for #TectonicTuesday we’re in Girvan in Scotland. The photo shows #slickensides that are mineral fibres and steps that tell us the direction of #fault movement. In this case the fault has moved horizontally and to the right. For scale you can just see the tip of a hammer in the top left. This photo was taken by @geosurveyni Chief Geologist Prof Mark Cooper #strikeslip #dextral #faulting #tectonics
-7.784816,110.651835 #soilscience #vertisols #slickensides #soilclassification Vertisols are a specific soil type characterized by the dominant presence of smectite clays, displaying a strong shrinking–swelling capacity under repeated dry–wet seasonal cycles (Schaetzl and Anderson, 2009).
#Repost @jtbpg with @get_repost ・・・ The river cut a path through the southwestern part of the valley and ridge and awhile later people built the hundred stairs to quarry the hardest parts of the Tuscarora quartzite. The formation is full of trace fossils, ripple marks, and #slickenlines or maybe the right word is #slickensides #tuscarora #pennsylvania #parocks #ridgeandvalley #silurian #quartzite #sandstone #geology
The river cut a path through the southwestern part of the valley and ridge and awhile later people built the hundred stairs to quarry the hardest parts of the Tuscarora quartzite. The formation is full of trace fossils, ripple marks, and #slickenlines or maybe the right word is #slickensides #tuscarora #pennsylvania #parocks #ridgeandvalley #silurian #quartzite #sandstone #geology
Slickensides: a geological feature where the grooves are caused by one block of rock slides over another at a fault line. These are at the Beer Quarry Caves, Beer, Devon, UK. www.beerquarrycaves.co.uk #slickensides #beer #beerquarrycaves #geology
É um privilégio ir na viagem de morfologia e classificação de solos e vivenciar na prática aquilo que não poderíamos ter visto aqui em GO. Fomós honradas na hora do sorteio não acredito até agora.... Valeu a pena não pelo 10, mas pelo conhecimento que agora temos como futuras profissionais. #aquié #VERTISSOLO #raridadebrasileira #gilgai #fendas #slickensides #eutrófico #argila2 :1 #unicaduplafeminina #irmadecurso #melhordupla #acadêmicasemformação
Brittle faulting and slickensides within Ayer Granite along the Wachusett Reservoir #structuralgeology #slickensides #twomicagranite #devonian #merrrimackterrane
⭐Hi Rockstars! Being able to recognize little geological hints in the field is an important skill for all Rockstars. Slickenlines are one great example of a feature that the observant Rockstar can take note of and glean valuable information from! 😁 Slickenlines are features found on the surface of a fault. That’s right, they’re found on the slip surface of a fault! There are actually two very similar features, known as slickensides and slickenlines. A slickenside is a very fine-grained, polished surface along a fault plane, polished by the actual movement of the rocks against each other. A slickenline is a lineation on the feature, which can tell us the orientation of movement of one side of the fault relative to the other! The lineation can be caused by a few things, such as a simple asperity that gouges the surface of the fault, abrasion of larger grains into pulverized rock, or precipitation of mineral fibers (Twiss & Moores, 2007). Combined with a marker layer which can suggest which side of the fault moved up or down, a slickenline gives us a powerful indicator of the potential movement of the fault, as much as a 2D feature can. 🤓 Keep in mind though, that they are not good indicators of the amount of displacement of the fault! They are of most use when at some angle to the observable fault surface, giving additional vector information in conjunction with marker layers in other axes. For example, observing a fault in an outcrop, a Rockstar might suggest a simple normal fault due to the displacement of an obvious marker rock down on the hanging wall. On closer inspection, the fault surface reveals slickenlines pointing outwards from the outcrop! This would then prompt our astute Rockstar to investigate the possible movement of the fault not only in the normal regime, but also the strike-slip! 😍 Until next time, Rockstars – enjoy our photos of slickensides and slickenlines from core samples!! 😘 ------------ Sources: Twiss, R. J. & Moores, E. M., (2007). Structural Geology. 2nd Ed. #geologyisforrockstars #geology #geologist #geologists #world #earth #nature #amazing #scientists #science #instagoods #in #insta #instagood #slickenlines #slickensides
Getting down and dirty inside a volcanic crater for a week straight might just be a volcanologist’s dream come true! This photograph shows Betsy Friedlander measuring the dimensions and orientations of slickensides inside the crater of Mount St Helens while on a scientific field trip. The crater of Mount St Helens, a stratovolcano in Washington State (USA), was made famous by its devastating explosive eruption in 1980, which was triggered by a landslide that removed most of the volcano’s northern flank. Between 2004 and 2008 Mount St Helens experienced another type of eruption – this time effusive (where lava flowed out of the volcano without accompanying explosions). Effusive eruptions produce lava flows that can either be runny (low-viscosity) or much thicker (high viscosity). Sometimes, the erupting lava can be so rigid that it juts out of the volcano as a column of rock, known as a spine. The 2004 to 2008 eruption at Mount St Helens saw the extrusion of a series of seven of these spines. These spines are generally unstable and tend to collapse after eruption, making it difficult to characterise their outer surfaces in detail and safely. Luckily, Mount St Helens provided an opportunity for a group of researchers to go into a volcanic crater and characterise these fault surfaces. But don’t try this at home!… volcanic craters require a significant amount of planning and the implementation of rigorous safety protocols! Image: In the belly of the beast. Credit: Alexandra Kushnir, University of British Columbia, Vancouver (distributed via imaggeo.egu.eu). ⠀ #Volcano #eruption #rocks #fieldwork #crater #research #scientist #geologist #fault #unstable #volcaniceruption #volcaniccrater #spines #MountStHelens #volcanologist #stratovolcano #USA #Washington #WashingtonState #slickensides #landslide #Imaggeo #imaggeoonmondays
Looking at the #woodgrain of a table while reading about structural #geology makes me think of #slickensides . I think that means I've got my geology hat on. #geologyrocks
@asub #slickensides amiright?!