What is the texture of granodiorite?

What is the texture of granodiorite?

Granodiorites are generally grayish-white, granular rocks, and because of the lower K-feldspar content, reddish colors, even in weathered rocks, are much less common than in granites. The typical texture is hypidiomorphic-granular.

What type of rock is granodiorite made of?

intrusive igneous rocks
Granite and granodiorite are intrusive igneous rocks that slowly cool deep underground in magma chambers called plutons.

What is the mineralogical composition and texture of dolerite?

Dolerite. Fine grained, ophitic texture. Primary minerals – plagioclase, pyroxene, hornblende and quartz. Acicular and lath-like plagioclase, equant grains of pyroxene – some alteration to chlorite along cleavage and fissures. Secondary minerals (10%) include chlorite.

What is the difference between granite and granodiorite?

Granodiorite is an intrusive rock, intermediate in composition between diorite and granite. Although often similar in appearance to diorite or granite, it has a higher quartz content than diorite, and a higher mafic mineral content than granite.

What is granodiorite composed of?

granodiorite, medium- to coarse-grained rock that is among the most abundant intrusive igneous rocks. It contains quartz and is distinguished from granite by its having more plagioclase feldspar than orthoclase feldspar; its other mineral constituents include hornblende, biotite, and augite.

Is granodiorite felsic or mafic?

felsic
Granodiorite is felsic to intermediate in composition. It is the intrusive igneous equivalent of the extrusive igneous dacite. It contains a large amount of sodium (Na) and calcium (Ca) rich plagioclase, potassium feldspar, quartz, and minor amounts of muscovite mica as the lighter colored mineral components.

What texture is diabase?

Diabase normally has a fine but visible texture of euhedral lath-shaped plagioclase crystals (62%) set in a finer matrix of clinopyroxene, typically augite (20–29%), with minor olivine (3% up to 12% in olivine diabase), magnetite (2%), and ilmenite (2%).

How is granodiorite rock formed?

Granodiorite is a plutonic igneous rock, formed by intrusion of silica-rich magma, which cools in batholiths or stocks below the Earth’s surface. It is usually only exposed at the surface after uplift and erosion have occurred.

What is the mineral composition of diabase?

Diabase is dense, hard, and sparsely fractured. It is composed mostly of plagioclase (An50-70), clinopyroxene (mostly augite) and magnetite +/- ilmenite. Accessory minerals include apatite, quartz, alkali feldspar, hornblende, titantite, and zirocon. Olivine is rare.