These rocks consist of gneiss, and gneissic diorite and quartz diorite, intruded by irregular bodies of equigranular granitic rocks, predominantly quartz diorite and granodiorite, with accompanying pegmatite and aplite.
22.
The radiometric age for the quartz diorite at Cerro Paine is 12 ?2 million years by the rubidium-strontium method and 13 ?1 million years by the potassium-argon method.
23.
Upstream from the Boy Scout camp the gorges are full of mica schist and gneiss ( metamorphosed sedimentary rocks ), and granodiorite, quartz monzonite, and quartz diorite ( granatic rocks ).
24.
Every large volcanic event is capped by metamorphosed sedimentary rocks and / or sills composed of medium-grained, white-weathering, quartz diorite that range in thickness from } } to } }.
25.
The first granitic event in the South Pass area includes tonalite dikes and plugs intruded into shear zones in the South Pass supracrustal rocks along with light-colored, metamorphosed leucodacite porphyry and quartz diorite.
26.
The "'Arikok National Park "'takes up approximately 18 percent of the island of Aruba and includes three primary geological formations : the Aruba lava formation, a quartz diorite formation, and a limestone formation that extends inward from the coast.
27.
A key piece of evidence is that the Crescent Formation is laid over sediments ( the Blue Mountain unit ) derived from the continent, including boulders of quartz diorite some 65 million years old; this requires the Crescent Formation to have formed close to the continent.
28.
On the Olympic Peninsula the Blue Mountain unit at the base of the Crescent Formation includes sediments ( including large boulders of quartz diorite ) of continental origin, showing that the continent was close by; other sediments were eroded from the pre-Cenozoic rock of Vancouver Island and the northern Cascade Range.
29.
In smaller areas, the bedrock is a narrow, long strip of quartz diorite running from the southeast of Harshaw northwestward to Alum Canyon, a narrow belt of granite porphyry beneath deposits of rhyolite along the western border, and Paleozoic limestone in a small east-west belt along the middle part of the southern border of the district.
30.
Gold-bearing ( + /-Ag, W, Sb, As, Cu, Mo, Pb, Te, Zn, Hg ) veins and shear zones occur in the 74 Ma ( million years old ) quartz diorite, in small amounts in the schist and in the mafic unit, but not in the 67Ma quartz monzonite, and in only one instance in the Tertiary sediments.
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