felsic rock वाक्य
उदाहरण वाक्य
मोबाइल
- Subduction processes may have played a role in the generation of the felsic rocks, but a tectonic setting for the ultramafic rocks remains uncertain.
- Pseudovesicular structure on alkaline felsic rocks, Nova Igua�u, State of Rio de Janeiro, Brazil, after Motoki et al . ( 2007)
- This rock has low Fe and Mg contents, in total about 3wt %, and in this sense it is classified to be felsic rock.
- Felsic rocks in these terranes contain sillimanite, kyanite, coesite, orthoclase and pyroxene, and are rare, peculiar rocks formed by an unusual tectonic event.
- The peak consists of non-alkali mafic rocks, dating from the Early Pleistocene overtop of non-alkali felsic rocks from the Late Miocene-Pliocene.
- VMS deposits are associated spatially and temporally with felsic rocks, usually present in the stratigraphy below the deposit, and often as the direct footwall to the deposit.
- The Hooggenoeg Formation felsic rocks can be divided into two groups : an intrusive group of interlocking and shallow intrusive rocks, and a porphyritic group of rocks from the veins.
- A key exception is in the ilmenites of kimberlites where the mineral usually contains major amounts of geikielite molecules, and in some highly differentiated felsic rocks ilmenites may contain significant amounts of pyrophanite molecules.
- These rock types include iron-rich diorite, gabbro, and norite; leucocratic mafic rocks such as leucotroctolite and leuconorite; and iron-rich felsic rocks, including monzonite and rapakivi granite.
- These felsic protocontinents ( cratons ) probably formed at hot spots from a variety of sources : mafic magma melting more felsic rocks, partial melting of mafic rock, and from the metamorphic alteration of felsic sedimentary rocks.
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