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I& #39;m starting a #geology thread with #GlacialErratics I found in my region (Västerbotten, Sweden. Last glaciation: Weichsel, ended ca. 10ky ago).
The first one is a porphyry.
Found in: Umeå (esker)
Probably from: Arvidsjaur/Arjeplog area
Notes: contains magnetite.
The first one is a porphyry.
Found in: Umeå (esker)
Probably from: Arvidsjaur/Arjeplog area
Notes: contains magnetite.
New #GlacialErratics from Sweden/Västerbotten:
Fragment of gneiss leucosome with big cordierite crystal.
Found in: Umeå, Klockarbäcken (esker or till)
Probably from: Precambrian basement.
Notes: fresh fragment from a bigger gneiss boulder.
Fragment of gneiss leucosome with big cordierite crystal.
Found in: Umeå, Klockarbäcken (esker or till)
Probably from: Precambrian basement.
Notes: fresh fragment from a bigger gneiss boulder.
New #GlacialErratics !
Garnet amphibolite with plagioclase.
Found in: Umeå (esker).
Probably from: I& #39;ve really no idea!
Notes: garnet amphibolite is relatively common in material I found here, but it& #39;s usually darker.
#Geology
Garnet amphibolite with plagioclase.
Found in: Umeå (esker).
Probably from: I& #39;ve really no idea!
Notes: garnet amphibolite is relatively common in material I found here, but it& #39;s usually darker.
#Geology
#GlacialErratics lost siblings reunited?
#mafic rocks (metabasalt?)
Found in: Malå (left); Umeå, esker (right), ca. 170 Km apart.
Notes: they& #39;ve very similar textures and contain magnetite (darker crystals/veinlets).
#mafic rocks (metabasalt?)
Found in: Malå (left); Umeå, esker (right), ca. 170 Km apart.
Notes: they& #39;ve very similar textures and contain magnetite (darker crystals/veinlets).
#GlacialErratics
#sedimentary sparagmite (arkose/sandstone), probably of ediacaran age.
Found: Umeå (esker)
Probably from: Sorsele/Arjeplog area.
#sedimentary sparagmite (arkose/sandstone), probably of ediacaran age.
Found: Umeå (esker)
Probably from: Sorsele/Arjeplog area.
#GlacialErratics
A fragment of feldspar with some rose quartz inclusions.
Found: Sörböle (Umeå), till.
Probably from: Precambrian Svecocarelian basement
Notes: it& #39;s my only rose quartz finding so far. #TeamQuartz
A fragment of feldspar with some rose quartz inclusions.
Found: Sörböle (Umeå), till.
Probably from: Precambrian Svecocarelian basement
Notes: it& #39;s my only rose quartz finding so far. #TeamQuartz
#GlacialErratics #Igneousrocks
A fragment of what looks like Revsundsgranite intruded by mafic rock (basalt?).
Found: Umeå, esker.
Probably from: Precambrian basement.
Note: notice the margins. Looks to me like the mafic rock is younger.
A fragment of what looks like Revsundsgranite intruded by mafic rock (basalt?).
Found: Umeå, esker.
Probably from: Precambrian basement.
Note: notice the margins. Looks to me like the mafic rock is younger.
When I post rocks from "Umeå, esker", that& #39;s how it looks like. It& #39;s a esker cut by present days Umeälven river (after @sguSverige maps). It& #39;s possible to find fresh material bc of erosion.
New #GlacialErratics
Conglomerate, major clasts looking like shale/schist.
Found in: Sörböle, Umeå (moraine or esker, there& #39;s mixed material in that locality)
Probably from: Caledonides, eventually autochtone margin.
Notes: Only found conglomerate sample with such clasts.
Conglomerate, major clasts looking like shale/schist.
Found in: Sörböle, Umeå (moraine or esker, there& #39;s mixed material in that locality)
Probably from: Caledonides, eventually autochtone margin.
Notes: Only found conglomerate sample with such clasts.
Micaschist with staurolite xls.
Found in: Sörböle, Umeå (moraine).
Probably from: Caledonides
Found in: Sörböle, Umeå (moraine).
Probably from: Caledonides
#garnet gneiss is this latest #GlacialErratics
Found in: Sörböle, Umeå (moraine)
Probably from: precambrian basement
Notes: much likely it hasn& #39;t travelled so long. Garnet paragneiss is common here.
Found in: Sörböle, Umeå (moraine)
Probably from: precambrian basement
Notes: much likely it hasn& #39;t travelled so long. Garnet paragneiss is common here.
A bigger boulder of #GlacialErratics with amphibolites (tremolite + actinolite?)
Found in: Sörböle, Umeå (moraine)
Probably from: good question.
Notes: this is one-of-a-kind boulder.
Found in: Sörböle, Umeå (moraine)
Probably from: good question.
Notes: this is one-of-a-kind boulder.
#Garnet and tourmaline schorl porphyroblasts in a matrix of quartz and feldspar.
Found in: Sörböle, Umeå (moraine)
Probably from: svecocarelian basement.
Notes: bigger boulders of similar composition, with almost euhedral crystals, are found in this locality.
Found in: Sörböle, Umeå (moraine)
Probably from: svecocarelian basement.
Notes: bigger boulders of similar composition, with almost euhedral crystals, are found in this locality.
Fresh hammered granite fragment.
Found in: Umeå, Klockarbäcken (moraine)
Probably from: Svecocarelian basement.
Notes: granites of different colours, xls dimension and compositions are relatively common in till here, almost as gneiss. Often w nice Carlsbad twins.
Found in: Umeå, Klockarbäcken (moraine)
Probably from: Svecocarelian basement.
Notes: granites of different colours, xls dimension and compositions are relatively common in till here, almost as gneiss. Often w nice Carlsbad twins.
Boulder (ca. 30 cm) with what looks like magma mingling.
Found in: Umeå, Klockarbäcken (moraine)
Probably from: Svecocarelian bedrock. A lot of igneous rock are found in area between SW Norrbotten and N Västerbotten.
Notes: it decorates my garden now. One of my favourites.
Found in: Umeå, Klockarbäcken (moraine)
Probably from: Svecocarelian bedrock. A lot of igneous rock are found in area between SW Norrbotten and N Västerbotten.
Notes: it decorates my garden now. One of my favourites.
Greenschist/phyllite.
Found in: Sörböle, Umeå (moraine).
Probably from: Caledonides.
Found in: Sörböle, Umeå (moraine).
Probably from: Caledonides.
"Ovary stone", very hard nodule, probably lithophysae (cut and wet surface on the left)
Found in: Sörböle, Umeå.
Probably from: precambrian bedrock, Duobblon area.
Notes: Lithophysae have been found in acid volcanic rocks near Sorsele (Vällingträsk).
Found in: Sörböle, Umeå.
Probably from: precambrian bedrock, Duobblon area.
Notes: Lithophysae have been found in acid volcanic rocks near Sorsele (Vällingträsk).
This pebble is not "probably from", but surely from Sorsele area, bc it& #39;s Sorsele granite, sometimes cited as part of the Transscandinavian Igneous Belt.
It& #39;s a monzogranite w porphyritic texture and some magnetite, ca 1.7Ga old, travelled ca 270-300 km.
Found in: Umeå (esker).
It& #39;s a monzogranite w porphyritic texture and some magnetite, ca 1.7Ga old, travelled ca 270-300 km.
Found in: Umeå (esker).
#volcanic rock with some pumice clasts.
Found in: Umeå (esker)
Probably from: Precambrian bedrock.
Notes: some parts are light greenish fluorescent in SW-UV.
Found in: Umeå (esker)
Probably from: Precambrian bedrock.
Notes: some parts are light greenish fluorescent in SW-UV.
Another #Glacialerratics very likely to be #volcanic : probably a basalt with calcite filled vescicules. The weathered rock surface shows a flow pattern.
Found in: Sörböle, Umeå (moraine)
Found in: Sörböle, Umeå (moraine)
#geology
New #Glacialerratics : unakite.
Found in: Sörböle, Umeå (moraine or esker).
Probably from: Precambrian bedrock.
Notes: unakite has been found in some locations in our region and is not uncommon in glacial material. Epidote can be massive or in veinlets.
New #Glacialerratics : unakite.
Found in: Sörböle, Umeå (moraine or esker).
Probably from: Precambrian bedrock.
Notes: unakite has been found in some locations in our region and is not uncommon in glacial material. Epidote can be massive or in veinlets.
New wednesday #geology post with #Glacialerratics.
This time you got a phyllite.
Found in: Sorböle, Umeå (moraine?)
Probably from: Caledonides.
Notes: the pic isn& #39;t that good, but this sample shows nice crenulation.
This time you got a phyllite.
Found in: Sorböle, Umeå (moraine?)
Probably from: Caledonides.
Notes: the pic isn& #39;t that good, but this sample shows nice crenulation.
#Glacialerratics found in Sörböle, Umeå (moraine).
Black, heavy pebbles with magnetite, I suppose mafic igneous rocks.
Black, heavy pebbles with magnetite, I suppose mafic igneous rocks.
Mafic or intermediate #Glacialerratics with nice texture of rounded dark minerals.
Found in: Sörböle, Umeå (esker or moraine)
Found in: Sörböle, Umeå (esker or moraine)
I& #39;ve discovered that there& #39;s a thread about #stonesathome
My #glacialerratics are falling in this category.
This is a hammered bit of milky quartz with some bluish big xls. My guess is cordierite, but it can be wrong.
Unknown origin, found in Sörböle, Umeå (moraine)
My #glacialerratics are falling in this category.
This is a hammered bit of milky quartz with some bluish big xls. My guess is cordierite, but it can be wrong.
Unknown origin, found in Sörböle, Umeå (moraine)
#stonesathome : another #Glacialerratics
Small quartz crystals from a small vug in what looked like a granite/granitoid boulder.
Found in: Sörböle, Umeå (moraine).
Small quartz crystals from a small vug in what looked like a granite/granitoid boulder.
Found in: Sörböle, Umeå (moraine).
