Tuff Thin Section
Tuff In Ppl The Curved Shapes Of Altered Glass Shards Ash Fragments Are Well Preserved Although The Glass Is Partly Altere Geology Natural Landmarks Bubbles
This Sample Is A Hornblende Rich Dacitic Tuff From The Miocence Age Cabo De Gata Volcanic Terrane In Southern Spain Thanks To Tri Geology Rock Fabric Textures
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Igneous textures in thin section.
Tuff thin section. Is a dark basaltic glass common in the groundmass of basalts or as thin shells on pillow lavas. The volcanic tuff consists of fragmentary particles as observed under microscope. The most common form of alteration hydrothermal or weathering in any natural glass is late stage devetrification whereby the unstable amorphous state of an acidic.
It is a poorly consolidated ash fall tuff with a glassy matrix full of crystal and rock fragments. Thin section analyses tuff samples from drill cores were sent to the xi an institute of geology and mineral resources for making slices and the thin sections were studied under a microscope by standard techniques to identify the minerals and for modal analyses at the department of geology northwest university china. Tachylite or sideromelane.
Alex strekeisen i vetrini della mia fantasia. The tuff is composed of olivine clino pyroxene plagioclase magnetite and ilmenite. These are photomicrographs very thin slices of rock seen in plane polarised light or between crossed polarisers when the colours seen are produced by interference of light.
Quite a number of pyroxene fragments rock fragments xenoliths and leucite both as xenoliths and in the rock fragments. The rock unit may either be interpreted as a plagioclase phyric volcanic wacke or as a plagioclase phyric crystal tuff. Sample 6711 su hawaiian suite ppl 100x magnification.
Description more details thin section microscope slide of a historic rock from vesuvius italy. The abundant plagioclase grains are commonly broken and sub rounded and a chlorite foliation surface not mafic phenocrysts is defected around these grains. Optical microscopy studies were also conducted by preparing thin sections of the samples.
Non welded tuff with several different texturally and compositionally different fragments that have different proportion of glass and crystals set in a fine grained ash matrix. The rock received its name from german geologist ferdinand von richthofen better known as the. It ranges in silica content between 40 to 55 wt.
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