Lmst

Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
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https://doi.org/10.1038/s41561-025-01704-5 <-- shared paper
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #IzuBoninMarianas #kinematics #backarc #earthquake #fault #faulting #orogenesis #platetectonics

Mélange (Petrology 💎)

In geology, a mélange is a large-scale breccia, a mappable body of rock characterized by a lack of continuous bedding and the inclusion of fragments of rock of all sizes, contained in a fine-grained deformed matrix. The mélange typically consists of a jumble of large blocks of varied lithologies. Both tectonic and sedimentary processes can form mélange. Mélange occurrences are associated with...

https://en.wikipedia.org/wiki/Mélange

#Melange #Petrology #StructuralGeology

2022

Patterson-UTI 293 - targeting the Woodford Formation (Upper Silurian - Devonian) through overthrusted Arbuckle Group (Silurian-Ordovician)….AND basement (Precambrian, ~2GA unconformity).

Basically, we drilled the whole sequence twice (per well) before reaching the target formation. Drilling the lateral portion was a whole other adventure due to the crazy structure of the area -imagine pushing an 18K’ string through a hard substance with the goal of making it 29K’ feet, through that substance, which, is actually perpendicular to the direction from which you started the hole. Oh, and you have to stay in between the lines, which undulate, dive, climb, and sometimes - disappear entirely, plus, you have to be blindfolded.

I was on this pad for 3.5 months, and we drilled TWO holes….only one successful. We drilled through 12K ft of granite, diorite, and granodiorite in between the Ordovician/Silurian limestones and dolomites. It was crazy.

Unfortunately for me - this was a post-layoff gig for a year, and the type of work I should have done at the beginning of my career, not the middle. And in my mid 40’s at that…..which, in a word, “sucked.” However, I learned a lot about the operations side of the business, which, having been in technical geoscience groups my whole career, was definitely enlightening. Rigs are an interesting place, with interesting people.

Never. Again. Lol

#geology #oilandgas #oklahoma #oldrocks #reallyoldrocks #reallyolderrocks #arbucklemountains #structuralgeology #worldclassgeology

Homoclinal ridge (Geomorphology 🏞️)

A homoclinal ridge or strike ridge is a hill or ridge with a moderate, generally between 10° and 30°, sloping backslope. Its backslope is a dip slope, that conforms with the dip of a resistant stratum or strata, called caprock. On the other side of the other slope, which is its frontslope, of a homoclinal ridge is a ...

https://en.wikipedia.org/wiki/Homoclinal_ridge

#HomoclinalRidge #Ridges #Geomorphology #SlopeLandforms #ErosionLandforms #StructuralGeology

Understanding Geological Time With Associate Professor Stijn Glorie [video]
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https://youtu.be/H2M2ZuVe9pE?si=iTahPKcOe2q2Yhs5 <-- shared video
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“A/Prof Stijn Glorie is a geochronologist at University of Adelaide who uses radio-isotope decay to date rocks, revealing Earth’s evolution and aiding insights into mountains, ores, and climate-tectonics links…”
#geology #time #learning #education #dating #age #epochs #understanding #rocks #structuralgeology #Quaternary #conception

@JanPV Beautiful! Not my specialist area, but I think that these are hackle or plumose marks. Most rocks are not homogenous, so when fractures form, they propagate in rather complex ways. The ones in you photo look as though they might be associated with finer-grained (siltier, or more shaly) beds in the rock, and might have propogated downwards. I'm not a structural geologist so this is all a bit vague. @allochthonous can probably say more, and more reliably! 😁 #StructuralGeology

What day is today...? Time for #FridayFold In #Asturias (NW Spain), once part of the mighty Variscan orogen. A nice example of tightly folded Devonian turbiditic deposits. Cap lens for scale. Medium size geologist for scale. #geology #structuralgeology #science ⚒️🧪

A cliff, with tightly folded rocks. A woman in field clothes inspects the area.

Weak Asthenosphere Beneath The Eurasian Interior Inferred From Aral Sea Desiccation
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https://doi.org/10.1038/s41561-025-01664-w <-- shared paper
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#GIS #spatial #mapping #remotesensing #earthobservation #inSAR #AralSea #rebound #isostaticrebound #asthenosphere #geology #structuralgeology #mantle #crust #weight #rheology #spatialanalysis #spatiotemporal #continent #desiccation #loss #drying #water #hydrology #elastic #viscoelastic #model #modeling #uplift #lithosphere #humanimpacts #tectonic

Critical Minerals In Ores (CMiO) Database
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https://lnkd.in/gynRjUfn <-- shared USGS publication
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https://lnkd.in/gETca3DQ <-- shared link to open data database, web map services, etc
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https://portal.ga.gov.au/persona/cmmi <-- shared web map
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https://lnkd.in/gdmMp2zg <-- shared editorial piece on critical minerals and geopolitics
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#geology #fedscience #opendata #CMMI #CMiO #criticalminerals #minerals #ores #database #opendata #GIS #spatial #mapping #spatialanalysis #commodities #technology #components #geochemistry #deposits #mining #extraction #classifaction #nomenclature #environments #structuralgeology #exploration
@USGS | @GeoscienceAustralia | @GeologicalSurveyOfCanada

USGS Releases Assessment Of Undiscovered Oil & Gas Resources In Wyoming, Southern Montana
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https://www.usgs.gov/news/national-news-release/usgs-releases-assessment-undiscovered-oil-and-gas-resources-wyoming <-- shared article
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https://doi.org/10.3133/fs20243049 <-- shared publication
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https://www.sciencebase.gov/catalog/item/65032556d34ed30c2058be2d <-- shared open data
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https://api.sciencebase.gov/geoserver/ows?service=wms&version=1.3.0&request=GetCapabilities&namespace=sb-65032556d34ed30c2058be2d <-- shared spatial service
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#GIS #spatial #mapping #oilandgas #OG #naturalresources #oil #gas #fedscience #model #modeling #Wyoming #Montana #assessment #WindRiverBasin #BighornBasin #PowderRiverBasin #exploration #undiscovered #energy #energysupply #geology #structuralgeology #sediments #lithology #reserves
@USGS

Multispectral Remote Sensing Expression of Lineaments and Alteration Minerals in Part of Crystalline Rock Units of Southwestern Nigeria - Implication on Gold Prospecting
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https://doi.org/10.1016/j.oreoa.2025.100091 <-- shared paper
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#GIS #spatial #mapping #ASTER #Gold #Hydrothermal #HydrothermalAlteration #Lineament #Landsat #ETM #EnhancedThematicMapper #phyllic #Ilesha #schist #belt #geology #mining #Nigeria #naturalresources #mineral #mineralresources #golddeposits #aerogeophysical #remotesensing #geophysical #spatialanalysis #geomorphology #geomorphometry #alteration #propylitic #argillic #mineralogy #XRD #structuralgeology #lithology #PrincipalComponentAnalysis #PCA #prospecting #fracture #joints #faulting #Multispectral #Lineaments #Crystalline

aerial oblique image - existing gold mine, Nigeria

geology/geomorphology map - Showing VES Positions Overlay on Mineral Prospective Map

(a) Lineament Map of the Study Area (b) Lineament Density Map of the Study Area (c) Superposition of Lineament on Geology Map of the Study Area

maps of remote sensing data - (a) Composite (RGB) 7, 5, 2 Image of the Study Area (b) Composite (RGB) 3, 2, 1 Image of the Study Area (c) Composite (RGB) 4, 3, 1 Image of the Study Area (d) Composite (RGB) 3, 2, 1 Image of the Study Area

How Did The Great Lakes Form? Scientists Think They Figured It Out
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https://www.earth.com/news/how-did-the-great-lakes-form-surprising-new-clues-have-emerged/#google_vignette <-- shared technical link
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https://doi.org/10.1029/2024GL110777 <-- shared paper
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#geology #mapping #structuralgeology #USA #Canada #GreatLakes #NorthAmerica #CapeVerde #hotspot #tectonics #magma #Superior #Michigan #Huron #Erie #Ontario #freshwater #lake #mantle #formation #pangaea #supercontinent #remotesensing #geophysics #continent #kimberlites #seismicvelocitymodel #model #modeling #plume #lithosphere #glacial #glacier #anisotropy

Map of northeastern America with tectonic features and seismic stations. The green rectangle marks the study region, and black triangles are the TA stations used in this study. Yellow diamonds are kimberlite locations. Red triangles represent the New England seamounts (NES), Cretaceous plutons in the White Mountains (WM) in New Hampshire and Monteregian Hills (MH) in Quebec, and Eocene volcanoes in northwestern Virginia. Blue curves indicate the Appalachian front and the Grenville front. The white dashed line shows the GM hotspot track. The Midcontinent Rift (MCR) and the Ottawa-Bonnechere Graben (OBG) are outlined in orange. The inset shows the current locations of the GM and CV hotspots in the Atlantic Ocean.

Maps of Vsv, radial anisotropy, and azimuthal anisotropy at selected depths. (a–c) Maps of shear wave velocity superimposed by azimuthal anisotropy (black bars). (d–f) Maps of radial anisotropy superimposed by azimuthal anisotropy. The bar length is proportional to the strength of azimuthal anisotropy; the bar orientation is the fast propagation direction of the S wave. White diamonds are the kimberlite locations. Red lines mark the locations of the vertical profiles AA’ and BB’ shown in Figure 3. The dashed white circle marks the area of circular azimuthal anisotropy. A1–A4 mark positive radial anisotropy regions.

Escalation Of Caldera Unrest Indicated By Increasing Emission Of Isotopically Light Sulfur
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https://doi.org/10.1038/s41561-024-01632-w <-- shared paper
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#GIS #spatial #mapping #geology #structuralgeology #volcano #vulcanism #caldera #numerical #model #modeling #eruption #risk #hazard #seismicity #deformation #gases #engineeringgeology #physicochemical #monitoring #CampiFlegrei #Italy #sulfur #fumaroles #hydrothermal #magma #dataanalysis #global

charts - chronogram of Campi Flegrei fumarole Solfatara, Italy compositional evolution from 1982 to 2023

diagram - Diagram of major species’ composition for CF fumaroles

schematic/cross-section - Campi Flegrei fumarole plumbing system, Solfatara, Italy

There Are Trails In Ireland That Have Been Certified As Part Of The International Appalachian Trail, Because They Were Formed Together During Pangea
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https://iat-sia.org/ <-- shared International Appalachian Trail home page
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https://en.wikipedia.org/wiki/International_Appalachian_Trail <-- shared Wikipedia page
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#GIS #spatial #mapping #hiking #tramping #walking #leisure #InternationalAppalachianTrail #AppalachianTrail #pangea #geology #tectonics #USA #Maine #Canada #Quebec #Newfoundland #Labrador #Greenland #Iceland #Norway #Sweden #Denmark #Scotland #NorthernIreland #Ireland #IsleofMan #Wales #UK #Britain #England #Spain #Portugal #Morocco #structuralgeology

photo - portion of the International Appalachian Trail, Ulster, Northern Ireland

map - International Appalachian Trail - with inset of Pangea with overlain modern country boundaries

map - International Appalachian Trail - proposed and existing, UK and Europe

photo - sign - International Appalachian Trail, Northern Ireland

Large Magma Bodies Found Beneath Dormant Volcanoes, Surprising Scientists
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https://phys.org/news/2025-01-large-magma-bodies-beneath-dormant.html <-- shared technical article
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https://doi.org/10.1038/s41561-024-01630-y <-- shared paper
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#GIS #spatial #mapping #remotesensing #seismology #seismic #teleseismic #magma #volcano #vulcanism #geophysics #geophysical #geology #structuralgeology #crust #hotspot #PNW #PacificNorthwest #MountRainer #MountSaintHelens #eruption #dormant #Cascades #CascadeRange #spatialanalysis #spatiotemporal #MountHood #ThreeSisters #Oregon #Washington #California #NewberryVolcano #CraterLake #MountShasta #LassenPeak #partialmelt #model #modeling #seismicity #earthquake #risk #hazard #active #threat #monitoring #engineeringgeology #EarlyWarningSystem

photo - An ash plume billows from the crater atop Mount St. Helens hours after its eruption began on May 18th, 1980, in Washington State. The column of ash and gas reached 15 miles into the atmosphere, depositing ash across a dozen states

photo - Mount Rainier, a snowcapped volcano, looms over Puyallup Valley near Orting, Washington. The prospect of a lahar — a swiftly moving debris flow caused by melting snow and ice typically during a volcanic eruption — poses a threat to surrounding communities.

maps/charts - Back-projected P–S conversions with phase polarities and geographical location determination of the Vs reduction bodies

cross sections - Possibilities of partial melts beneath each volcano

[SWARM] Satellites Detect Hidden Magnetic Signals In Earth's Oceans
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https://www.earth.com/news/satellites-detect-hidden-magnetic-signals-in-earths-oceans/ <-- shared technical article
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https://doi.org/10.1098/rsta.2024.0078 <-- shared paper
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https://www.esa.int/Applications/Observing_the_Earth/FutureEO/Swarm <-- shared ESA SWARM home page
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#GIS #spatial #mapping #remotesensing #ESA #SWARM #earthobservation #geomagnetism #magnetism #earth #global #magnetic #ocean #marine #tide #tidal #tidalinfluence #monitoring #spatialanalysis #spatiotemporal #model #modeling #magma #crustal #geology #structuralgeology #crust #plate #geophysics #geophysical #vulcanism

global maps - Standard deviation (in nT) maps calculated from the model covariance matrix 𝐂𝜏 for each tidal constituent and propagated to the radial magnetic field at 430 km altitude.

schematic - ocean, crust, magnetic field lines

global maps - Maps of the real and imaginary parts of the observed, 𝐵𝑟obs, as given by the GFO24-HR model, and numerically simulated, 𝐵𝑟DNS, ocean tidal radial magnetic fields owing to the semi-diurnal 𝑀2 and 𝑁2 tidal constituents. Fields are given at the altitude of 430 km. Red rectangles highlight the regions discussed in detail in the text.

global maps - Same as similar other figure, but for the diurnal 𝑂1 and 𝑄1 tidal constituents.

Deep Beneath California's Sierra Nevada, Earth's Lithosphere May Be Peeling Away
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https://phys.org/news/2025-01-deep-beneath-california-sierra-nevada.html <-- shared technical article
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https://doi.org/10.1029/2024GL111290 <-- shared paper
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#GIS #spatial #mapping #geology #lithosphere #California #SierraNevada #continentalcrust #crust #mantle #foundering #remotesensing #geophysics #geophysical #earthquake #spatialanalysis #spatiotemporal #structuralgeology #earthquake #seismic #seismology #Moho #platetectonics #tectonics #shearzone #faults #faulting #seismicity #model #modeling #3dmodel

photo - portion of the Sierra Nevadas, rocky landscape

maps - results from receiver function analysis, Sierra Nevada, California

cross-section schematic - Perspective view of imaged shear layer in geographic context for the central and southern Sierra

map - Study area. Seismic stations (triangles, dark gray = permanent, light gray = temporary), seismicity with 40+ km depth from USGS ComCat catalog 2006–2023 (blue circles); thin black rectangle is extent of Figure 2. Faults in light gray. Small inset map shows regional context; main figure area outlined. GO-Gorda plate; MTJ-Mendocino triple junction; PA-Pacific plate; YP-Yosemite National Park; FR-Fresno; MW-Mt. Whitney; RC-Ridgecrest. Blue station labels mark examples appearing in later figures.

Edge Of Mars’ Great Dichotomy Eroded Back By Hundreds Of Kilometres
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https://arstechnica.com/science/2025/01/field-of-mounds-on-mars-may-be-sign-of-erosion-at-the-edge-of-an-ocean/ <-- shared technical article
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http://dx.doi.org/10.1038/s41561-024-01634-8 <-- shared paper
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#GIS #spatial #mapping #planet #Mars #remotesensing #imagery #landsurface #geology #topography #astrogeology #elevation #morphology #martian #geography #marsdichotomy #plateau #lowlands #model #3dmodel #basin #highlands #shoreline #ocean #crust #structuralgeology #chemostratigraphy #morphostratigraphy #geomorphometry #geomorphology #water #hydrology #CaSSIS #HiRISE #stratigraphy #strata #MOLA #laser #LiDAR #MawrthVallis #crater #mound #profile #crosssection #geochemistry #mineralogy #CRISM #CTX #HRSC #DTM #erosion #weathering #spatialanalysis #spatiotemporal

images - Morphological similarities between the stratigraphy in the mounds and the Mawrth Vallis plateau region

3D model, map, images and charts - Chemostratigraphy and morphostratigraphy of a well-exposed mound

3D map and cross section - Three-dimensional view of study area with stacked elevation profiles

image/map - the topography of Mars by the Mars Orbital Laser Altimeter (MOLA)

Atop The Oregon Cascades, [Research] Team Finds A Huge Buried Aquifer
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https://www.eurekalert.org/news-releases/1069774 <-- shared technical article
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https://doi.org/10.1073/pnas.2415155122 <-- shared paper
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https://www.usgs.gov/centers/oregon-water-science-center/science/mckenzie-river-source-water-study <-- shared USGS technical article, 2011, ‘McKenzie River Source Water Study’
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https://youtu.be/6R8e5HwGMwU?si=sniW4bvvzzviTYie <-- shared media video overview
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#GIS #spatial #mapping #model #modeling #water #hydrology #Oregon #Cascades #CascadeMountains #PNW #PacificNorthwest #volcanic #rocks #aquifer #waterresources #watermanagement #climatechange #snowpack #drought #spatialanalysis #CriticalZone #geohazards #geology #engineeringgeology #landscapes #weathering #bedrock #holocene #groundwater #structuralgeology #orogeny #remotesensing #geophysics #sampling #drilling #porosity #permability #tomography #lava #spring #seep #breccia #discharge #streams #runoff #precipitation #climate #rainfall #recharge

photo - Scientists examine a large-volume spring in young volcanic rocks of the McKenzie River watershed on the west side of the Cascade topographic crest that was monitored as part of this study. Credit: Benjamin Nash

map, photo and charts - (A) Electrical resistivity tomography of Olallie North Spring, which emerges along a flow contact of _25 ka Scott Mountain lava flows. Lateral variations correspond to spring discharge points along the lava flow basal breccia such as depicted in (B) (photo: Benjamin Nash). (C) Mean of total yearly range in discharge _Q divided by mean annual flow Qavg versus average upstream age for springs and streams. The horizontal line defines “spring-” versus “runoff-” dominated. (D) SD of yearly average summer discharge (June–September), normalized by Qavg, with CZ state shift labeled.

$maps and chart - (A) Distribution of geothermal drill holes. Thin black circles’ radii scale with total logged length, and colors indicate the fraction of length for which dT=dz < 20_C/km (implying downward flux of meteoric water). Red circles are the fraction with inverted gradients (dT=dz < 0_C/km). The purple contour indicates bedrock ages <2 Ma, while stars mark Holocene age phreatomagmatic eruption vents. (B) Two example temperature-depth logs from deep wells in old and young bedrock. (C) Porosity (blue) and resistivity (orange) in the Santiam Pass drill hole SP 77-24. Dashed lines indicate low porosity at high measured resistivity. (D) Chemical weathering tracked by oxidation state of iron in the Santiam Pass drill hole. The green box indicates range of Quaternary High Cascades lavas (SI Appendix), indicating that much of the SP 77-24 hole has been oxidized.$