WebThe Rb-Sr whole-rock isochron, age 1636 ± 66 Ma of Mirgarani granite, is the one of the oldest granite dated in the northwestern part of the Chhotanagpur Granite Gneiss Complex (CGGC). The initial Sr ratio is 0.715 ± 0.012 (MSWD = 0.11), showing an S-type affinity. WebQ: Migmatite’s texture, grain size, and parent rock are: A: a) foliated, medium to coarse, shale b) weakly foliated, fine, any rock type c) nonfoliated, coarse, bituminous coal d) foliated, medium to coarse, quartz Q: Match with the best answer. A: Lowest grade Slate Highest grade Migmatite

Migmatite - Wikipedia

Webmigmatite, in geology, rock composed of a metamorphic (altered) host material that is streaked or veined with granite rock; the name … WebFigure 7.3.4 Regional metamorphism of oceanic crust at a subduction zone. (Example: Cascadia subduction zone. Rock of this type is exposed in the San Francisco area.) Figure 7.3.5 Franciscan Complex blueschist rock exposed north of San Francisco. The blue colour of rock is due to the presence of the amphibole mineral glaucophane. rivelin cleethorpes

Migmatite and metamorphism - SlideShare

WebWhat kind of rock is shale? sedimentary rocks Shale, any of a group of fine-grained, laminated sedimentary rocks consisting of silt- and clay-sized particles. Shale is the most abundant of the sedimentary rocks, accounting for roughly 70 percent of this rock type in the crust of the Earth. Shales are often found with layers of sandstone or ... WebMigmatite is a rock at the frontier between igneous and metamorphic rocks. They can also be known as diatexite . Migmatites form under extreme temperature conditions … WebThis is the first official FROGS report in Eos. Our purpose is to disseminate information about the status of felsic igneous petrology, providing information and opinions about research, ideas, and problems that relate especially to granitoids but also, clearly, to felsic volcanic rocks. A major goal has been to bridge the gap between field-based and … smith mandel