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Granodiorite (/ ˌɡrænoʊˈdaɪ.əraɪt, ˌɡrænəˈ -/ GRAN-oh-DY-ə-ryte, GRAN-ə-) [ 1 ][ 2 ] is a coarse-grained (phaneritic) intrusive igneous rock similar to granite, but containing more plagioclase feldspar than orthoclase feldspar. The term banatite is sometimes used informally for various rocks ranging from granite to diorite ...
Tonalite–trondhjemite–granodiorite (TTG) rocks are intrusive rocks with typical granitic composition (quartz and feldspar) but containing only a small portion of potassium feldspar. Tonalite , trondhjemite , and granodiorite often occur together in geological records , indicating similar petrogenetic processes. [ 1 ]
Half Dome Granodiorite traces to early Late Cretaceous. Its age is between 85 and 83.4 (+/-1 to 2%) Ma, with average age of 84.1 Ma. It is younger than Sentinel granodiorite (88.4 Ma), and older than Cathedral Peak granite (83.7 Ma). [4] Half Dome Granodiorite is the Valley's youngest plutonic rock. [5]
Rosetta Stone. The Rosetta Stone is a stele of granodiorite inscribed with three versions of a decree issued in 196 BC during the Ptolemaic dynasty of Egypt, on behalf of King Ptolemy V Epiphanes. The top and middle texts are in Ancient Egyptian using hieroglyphic and Demotic scripts, respectively, while the bottom is in Ancient Greek.
Former quarry wall of the granodiorite in Baltimore County southeast of Ellicott City. The Ellicott City Granodiorite is a Silurian or Ordovician granitic pluton in Howard and Baltimore Counties, Maryland. It is described as a biotite granodiorite along the margin of the intrusion which grades into a quartz monzonite in its core. [2]
Kuna Crest Granodiorite makes up most of the outer part of the Tuolumne Intrusive Suite. Of the Tuolumne Intrusive Suite, it is the most melanocratic of the granodiorites containing many mafic microgranular enclaves. It is fine- to medium-grained (0.1–4 mm). The mafic minerals are generally oriented and define a foliation .
Sentinel Granodiorite is a light-gray and medium-grained biotite - hornblende granodiorite. The color index is normally about 15, and ranges from 10 to 25. The hornblende is tabular, of crystals which are usually 4 - 6 millimeters long, and helps to define a weak to moderately strong magmatic foliation and lineation.
Diorite. Diorite (/ ˈdaɪ.əraɪt / DY-ə-ryte) [1][2] is an intrusive igneous rock formed by the slow cooling underground of magma (molten rock) that has a moderate content of silica and a relatively low content of alkali metals. It is intermediate in composition between low-silica (mafic) gabbro and high-silica (felsic) granite.