commonly associated with gabbros. Igneous rocks can be either intrusive (plutonic and hypabyssal) or extrusive (volcanic). Intrusive igneous rocks make up...

(1,065 m). Puerto Rico is composed of Cretaceous to Eocene volcanic and plutonic rocks, which are overlain by younger Oligocene to recent carbonates and...

intrusive rocks and intensely deformed metamorphic rocks. Most of the plutonic rocks were formed at the same time as the Granite Harbour Intrusives. Almost...

west and east of Llullaillaco: The 282 ± 7 million years old Llullaillaco plutonic complex, the Devonian-Carboniferous Zorritas Formation and Oligocene-Miocene...

regions. Puerto Rico is composed of Cretaceous to Eocene volcanic and plutonic rocks, overlain by younger Oligocene and more recent carbonates and other...

basis of an offset tectonic terrane boundary of Paleozoic age, a Paleozoic plutonic belt, a Jurassic shoreline, Oligocene and Miocene sediments from inferred...

sodium oxide (Na2O) content (with low K2O/Na2O ratio) compared to other plutonic rocks, and low ferromagnesian element content (the weight percentage of...

Orthoclase feldspar (KAlSi3O8) is a mineral commonly found in granite, a plutonic igneous rock. When exposed to weathering, it reacts to form kaolinite (Al2Si2O5(OH)4...

Orbicular granite (also known as orbicular rock or orbiculite) is an uncommon plutonic rock type which is usually granitic in composition. These rocks have a...

trachytes, nephelinites, trachyandesites, tephrites and rhyolites. Outcrops of plutonic rocks (for example, syenites, gabbros and pyroxenites) that formed deep...

2 mm across), as gabbro. Diabase and gabbro are thus the hypabyssal and plutonic equivalents of basalt. In the Hadean, Archean, and early Proterozoic eons...

shear zone patterns and displacements within magmatic arcs: The Coast Plutonic Complex, British Columbia". Tectonics. 18 (2): 278–292. Bibcode:1999Tecto...

the Norseman-Wiluna Greenstone Belt. A change from volcanic-dominated to plutonic-dominated magmatism occurred in the Norseman-Wiluna Greenstone Belt approximately...

development of the Cadomian and above all Hercynian phases, gave rise to plutonic rocks: greenstone (gabbros, granites) and metamorphic rocks (gneiss, micaschists...

being much older Paleozoic (hundreds of millions of years) metamorphic and plutonic rocks. It is unknown whether this difference is in any way linked with...

(shades of red),   basaltic andesite,   rhyolite, (ignimbrite is lighter shades of violet), and   plutonic. White shading is selected caldera features....

Archean and Paleoproterozoic rocks) is a northwest-southeast diagonal. Plutonic rocks that formed during accretion of volcanic arcs or continental collisions...

Tianshan orogenic belt and the Junggar basin". Tectonophysics. 376 (3–4): 199–239. Bibcode:2003Tectp.376..199J. doi:10.1016/j.tecto.2003.07.001. ISSN 0040-1951...

several vents initially filled paleovalleys glacially incised into the Coast Plutonic Complex basement. Several dacitic domes and derivative pyroclastic material...

Antofalla's western flank. Volcanic systems like Antofalla and volcano-plutonic complexes often develop mineral deposits through hydrothermal and epithermal...