#gneiss — Public Fediverse posts

To Predict Tree Death, Scientists Tapped Gamma Rays To Peer Underground
(Airborne radiation sensors could help forecast and prevent drought-driven tree mortality_
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https://www.science.org/content/article/predict-tree-death-scientists-tapped-gamma-rays-peer-underground <-- shared technical article
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https://doi.org/10.1029/2026GL122182 <-- shared paper
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H/T @hannah Richter
“Over an 18-month period starting in 2023, the dense forests of Western Australia [WA] experienced a record-setting drought. Jarrah trees towering 35 metres high died off in patchy brown splotches, turning 400 square kilometres - 3% of the forest - into brittle, fire-prone stands. The event led researchers to wonder whether there was a better way to predict where such die-offs might occur both there and in other forests, a problem that has long been tricky to solve because important factors such as soil depth are hidden underground…
Now, those same researchers have unveiled a surprising new tool for predicting tree mortality: gamma rays [link above.] Resulting from the natural decay of the potassium-40 isotope from granite-rich bedrock, the radiation acts as a proxy for soil depth, which in turn signals how much water a tree can access during drought. The new method could be applied to other highly weathered soils, which cover one-third of Earth’s ice-free land...”
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"... PLAIN LANGUAGE SUMMARY: During a record-breaking drought and heat event in 2023–2024, forests in southwestern Australia experienced widespread, patchy die-off. While we know that extreme weather triggers these events, it is often a hidden factor, the thickness of soil and the depth to underlying bedrock, that determines which trees live or die. Trees growing in shallow soil over solid rock are highly vulnerable due to limited water storage. Here, [they] show how to map these hidden zones from the air using gamma rays that are naturally emitted by potassium in the ground. Like southwestern Australia, many parts of the world have highly weathered soils where potassium has been washed out of the upper layers of soil. However, [they] showed that higher potassium areas signal that potassium-rich bedrock is closer to the surface and this is sensitive for tens of meters. By comparing gamma ray maps with ground-based geophysical surveys and satellite data, [they] showed that these potassium hotspots accurately predict where forests are most likely to experience die-off during a drought. These types of soils cover about one-third of the Earth's land, so the method provides a powerful new tool for managers to identify and protect vulnerable forests from future, hotter droughts…”
#GIS #spatial #mapping #spatialanalysis #spatiotemporal #Australia #WesternAustralia #WA #forests #vegetation #bush #jarrah #karri #drought #heat #extremedrought #extremeweather #climatechange #water #waterresources #dieoff #soil #weathering #erosion #moisture #nutrients #airborne #gammarays #GRS #granite #gneiss #bedrock #geology #potassium40 #potassium #K #remotesensing #earthobservation #groundwater #interstitial #subsurface #waterstorage #electricalresistivitytomography

Le pietre del giardino metropolitano dove affiorano le ossa primordiali del subcontinente indiano
https://www.jacoporanieri.com/blog/?p=44841

#geologia #antichità #preistoria #archeano #giardini #colline #pietre #materiali #gneiss #profondità #processi #cratone #eoni #territorio #paesaggio #luoghi #puntidiriferimento #viaggi #turismo #città #mysore #Bangalore #india #karnataka

Blender tutorial - Procedural rocks (gneiss)

https://makertube.net/w/x1GiYn5i9M9F3JeaBqeUyF

A very cool wolf spider, just quietly moving around on moss. Allowed enough time for a decent picture (with an android phone)
Set on a typical gneiss'ish rock infused with hard white quartz crystals.

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

#wolfspider #mosstodon #geology #IndiasNatures #spider #nature #himalayas #nature #Lycosidae #gneiss #QuartzCrystals

It wouldn't be a holiday to Assynt without some serious rockery. Here we have the Moine Thrust exposure by Loch Glencoul and Loch Eileanach surrounded by wonderful Scourian gneiss and amphibolite dykes.

#assynt #geology #moinethrust #gneiss #landscape #nature #drone #photography #scotland #geopark

‘Now that commerciality no longer equals employment, and with a dystopian future looming, what art should I make? What art do I want to make?’
— Holly Exley
https://www.youtube.com/watch?v=I5CI-epXcaY

#HollyExley #watercolor #painting #landscapePainting #landscape #art #artMaking #Islay #gneiss #Rhinns

I don't normally post ads on social media, but this might be of interest to anyone interested in #geology in the #Glasgow area. I am selling a free-standing island kitchen unit (cupboard/drawers) with an absolutely stunning #granite (actually #gneiss ) top 127x86cm. It's beautifully polished and lovely minerals such as garnets, pyrite & pyroxene (?) are visible. Truly a spectacular top but I will have nowhere to put it ☹️.

Base units high quality, vgc, white

Please let me know if interested.

Gneiss Boulder

Prints, cards and more available via the website: https://shiny.photo/photo/Gneiss-Boulder-5b4483e0d85e9f4db2754ed35ec0618e

There is quite a pronounced change in the underlying geology, going from the beach at St Cyrus (igneous; tuff) half a mile further round to Tangleha'. So no wonder I was surprised to see this beautiful banded gneiss sitting in a beach of otherwise red sandstone.

#gneiss #geology #aberdeenshire #landscape #scotland #photography

Twisted layers of Schist and Gneiss pointing skywards, beneath Carigeen head.
Sliabh Liag, County Donegal, Ireland.

Cormacscoast.com walking tours

#wildatlanticway #walkingtours #discoverireland #keepdiscovering #sliabhliag #slieveleague #sliabhliagcliffs #geology #schist #gneiss

@Anthro I found the source, Anthro! The Wilderness Suite granite: a part of the metamorphic gneiss posted by @AZGeology on Twitter: “Metamorphic #gneiss exposed just uphill from mile marker 5 along the Catalina Highway, Santa Catalina Mtns., Tucson, AZ. The parent rocks include the 1.4 billion-year-old blackish Oracle granite and the 50-million-year-old white Wilderness Suite #granite.”
We were blocked from going up the mountain as the road was closed by ice roads.

New Geological Study Shows Scandinavia Was Born In Greenland
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https://phys.org/news/2024-03-geological-scandinavia-born-greenland.html <-- shared technical article
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https://doi.org/10.1130/G51658.1 <-- shared paper
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“The oldest Scandinavian bedrock was "born" in Greenland according to a new geological study from the University of Copenhagen. The study helps us understand the origin of continents and why Earth is possibly the only planet in our solar system with life..."
#geology #structuralgeology #Scandinavia #greenland #finland #research #crust #mantle #zircon #gneiss #denmark #craton #lithosphere #shield #FennoscandianShield #Archean #Eoarchean #NorthAtlanticcraton #geologymap #mapping

#Gneiss boulder

I came upon this stream-polished boulder along the Quinebaug River, just below East Brimfield Reservoir near #Sturbridge, #Massachusetts. Because it has been transported and I just took a photo, I don’t know its origins…but it looks like either the Quinebaug or Marlboro formations, Ordovician and Cambrian, respectively. Laurentia, not Gondwana. Lovely banding, eh? Lens cap is about 4 cm in diameter.
#gneiss #Paleozoic #metamorphic #geology #photo 27 mm #Fujifilm

A Simplified GIS And Google-Earth-Based Approach For Lineaments And Terrain Attributes Mapping In A Basement Complex Terrain
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https://doi.org/10.1038/s41598-022-20057-2 <-- shared paper
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#GIS #spatial #mapping #imagery #geology #geologic #geological #geologymap #remotesensing #IdanreHills #Nigeria #Africa #spatialanalysis #structuralgeology #network #structural #imagery #lineaments #terrain #methodology #stream #hydrology #geomorphology #roughness #gischat #GoogleEarth #geologicmapping #batholith #gneiss #slope #flowlines #weathering #remotemapping #hillshade #raster

South Uist, 2020.

The boat in the foreground was called Stardust, but that really does depend on who's story you choose to believe...

#InnseGall #OuterHebrides #SouthUist #boat #decay #BenKenneth #Photography #LandscapePhotography #Gneiss #Landscape

One day here in northeastern MN, we went out on a walk to see where the wild blueberries were, and we came upon a rock outcropping. I always pick up interesting rocks. This one is a foliated gneiss, probably over 2 1/2 billion years old. And there it was, just waiting for me to pick up. That I live where such old things are there on the surface...mindblowing

#rockhounding #geology #gneiss

I swore I would share this astonishing rock face whenever I saw it on the bird site, so since I’ve migrated, I have to bring it here :)

The rock face was likely originally a #gneiss - a foliated #metamorphic rock where light minerals and dark minerals form in alternating bands due to high heat and pressure. This rock was further complexly folded and refolded during continental collisions and mountain building.

The rock face also has an unusual & beautiful texture caused by the more erodible bands partially eroding. Some have likened the texture to Damascus, a metal forging technique.

All the details you are asking yourself are here: https://the-geophysicist.com/caledonian-folding-in-saltstraumen

#ScienceMastodon #gneiss #rocks #geology

I HAD to bring this gorgeous Norwegian #rock face with me from the bird site :)

This rock face was likely #gneiss, a foliated #metamorphic rock where light minerals and dark minerals form in alternating bands due to high heat and pressure. This rock was further complexly folded and refolded during continental collisions and mountain building.

The rock face also has an unusual & beautiful texture caused by the more erodible bands partially eroding.

More here: https://the-geophysicist.com/caledonian-folding-in-saltstraumen