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#schist

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💧🌏 Greg Cocks

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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doi.org/10.1016/j.oreoa.2025.1 <-- 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
Public
Chris Koester (old account)
As of today, more than 700 people follow my account on pixelfed.
Thank you for your interest in my amateur experiments with my #Nikon D7100 and my #Gigaset smartphones!
Thanks for all your photos and conversations from all over the world!
Thanks for this great #Fediverse community!
Thanks to #Pixelfed, the platform that brought us all together!
Many thanks to @dansup, who does a great job to provide us all with this ad-free, corporation-free and in every way free platform!

July 2023 Christoph Koester

#monochrome #blackandwhite #bw #noiretblanc #nb #schwarzweiß #sw #olsberg #gierskopp #slate #schiefer #schist #slatestone
As of today, more than 700 people follow my account on pixelfed. Thank you for your interest in my amateur experiments with my #Nikon D7100 and my #Gigaset smartphones! Thanks for all your photos and conversations from all over the world! Thanks for this great #Fediverse community! Thanks to #Pixelfed, the platform that brought us all together! Many thanks to @dansup@pixelfed.social, who does a great job to provide us all with this ad-free, corporation-free and in every way free platform! July 2023 Christoph Koester
As of today, more than 700 people follow my account on pixelfed. Thank you for your interest in my amateur experiments with my #Nikon D7100 and my #Gigaset smartphones! Thanks for all your photos and conversations from all over the world! Thanks for this great #Fediverse community! Thanks to #Pixelfed, the platform that brought us all together! Many thanks to @dansup@pixelfed.social, who does a great job to provide us all with this ad-free, corporation-free and in every way free platform! July 2023 Christoph Koester
As of today, more than 700 people follow my account on pixelfed. Thank you for your interest in my amateur experiments with my #Nikon D7100 and my #Gigaset smartphones! Thanks for all your photos and conversations from all over the world! Thanks for this great #Fediverse community! Thanks to #Pixelfed, the platform that brought us all together! Many thanks to @dansup@pixelfed.social, who does a great job to provide us all with this ad-free, corporation-free and in every way free platform! July 2023 Christoph Koester
#slatestone
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Vicky Veritas

Oh, Schist!

Schist is a metamorphic rock, whose name is one of those groan-worthy geology puns. Depending on how much mica is in the rock, schist can also be a remarkably strong, or it can be a little flaky:) Now for the fun stuff.

Schists are medium to high-grade (metamorphic pressure and temperature) medium-grained metamorphic rocks whose minerals are aligned in a preferred orientation perpendicular to the direction of the compressive forces that formed them, such as mountain building. Their foliation usually defines planes of weakness, but the strength of the rock can vary. Schists can form from sedimentary, igneous, and even other metamorphic rocks, but the composition of the original rock (protolith) must allow platy minerals to grow. Schists commonly contain quartz, feldspar, mica, chlorite, graphite, talc, and a variety of other minerals. Schists can also contain large well-formed crystals such as garnet (a metamorphic index mineral), emerald, sapphire, and ruby. If the protolith is known, the schist is named accordingly (ie meta-sandstone schist). If the protolith is unknown, the schist is named after its minerals such as mica-garnet schist, or greenstone, after its color, for a chlorite-bearing schist.

Schists are some of my favorite rocks. They can sparkle (thank you, mica) and are always fascinating rocks that indicate tectonics were involved in their formation. I never take them for granite:) I’ll show myself out…

Road cut in Vadito Group mica schist, Picuris Mountains, New Mexico, USA. Source wikimedia commons. This image shows a road cut in the muscovite (mica) schist of the Vadito Group along the highay from Dixon to Picuris Pueblo, New Mexico, USA. The image was taken at midday on the summer solstice, and the parallel layers of muscovite in the surface reflect the sunlight to create the illusion of a metal wall. This image has not been digitally manipulated except to stitch three individual exposures into a panorama. The road and road cut are nearly straight; the curved appearance is an artifact of the panorama technique.
Garnet Mica Schist from Salangen, Norway. showing the crenulation cleavage associated with the deformation event. This Schist was formed during the Caledonian Orogeny. Penny Coin for scale.
Garnet-chlorite schist from Alabama, USA. (public display, Dakota Dinosaur Museum, Dickinson, North Dakota, USA) Schist is an intermediate- to high-grade, foliated metamorphic rock. It is highly variable in appearance, depending on the mineral content, which is a function of the precursor rock and specific temperature-pressure conditions. Garden-variety schists form by metamorphism of phyllites. Schists typically have medium- to large-sized crystals, unlike the microcrystalline nature of slate & phyllite. Schist's foliated texture (= crystals aligned into bands or stripes or layers) is often only seen when specimens are viewed on edge. Chlorite schist is a moderately common metamorphic rock. It is principally composed principally of chlorite, a silicate mineral with a greenish to grayis
#schist#MetamorphicRock#geology
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