Quartz monzonite is an intrusive , felsic , igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars . It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase. Quartz is present in significant amounts. Biotite and/or hornblende constitute the dark minerals. Because of its coloring, it is often confused with granite , but whereas granite contains more than 20% quartz, quartz monzonite is only 5–20% quartz. Rock with less than five percent quartz is classified as monzonite . A rock with more alkali feldspar is a syenite whereas one with more plagioclase is a quartz diorite . The fine grained volcanic rock equivalent of quartz monzonite is quartz latite .
5-571: The Salal Creek Pluton , also called the Salal Creek stock , is a small circular quartz monzonite intrusion with an area of 35 sq mi (91 km). It is eight million years old, containing 52 dikes composed of basalt and was probably formed 5 mi (8.0 km) or less below the Earth's surface. It forms part of the Pemberton Volcanic Belt , a geological formation that formed as
10-591: A result of subduction zone magmatism in the Canadian Cascade Arc . 50°27′09″N 123°14′36″W / 50.4526°N 123.2433°W / 50.4526; -123.2433 This article about a location on the Coast of British Columbia , Canada is a stub . You can help Misplaced Pages by expanding it . This article about a specific Canadian geological feature is a stub . You can help Misplaced Pages by expanding it . Quartz monzonite The term adamellite
15-625: The Utah State Capitol . The large boulders of Joshua Tree National Park in southern California are quartz monzonite. A large pluton in the Atlanta lobe of the Idaho Batholith , near McCall , Idaho , is made of quartz monzonite. The Guilford Quartz Monzonite and Woodstock Quartz Monzonite , probably comagmatic, are located in central Maryland . In Queensland , Castle Hill, Mount Stuart and Mount Louisa around Townsville represent
20-807: The Kinsman Quartz Monzonite is an extensive formation that underlies Kinsman Mountain , parts of Franconia Notch , Mount Cardigan , and Mount Sunapee . Stone Mountain in Georgia is a large quartz monzonite monadnock . Quartz monzonite extracted from a quarry in Little Cottonwood Canyon was used to build several buildings in Salt Lake City , Utah , including the Church of Jesus Christ of Latter-day Saints ' Salt Lake Temple , Church Administration Building , and Conference Center , as well as
25-458: Was originally applied by A. Cathrein in 1890 to orthoclase-bearing tonalite (likely a granodiorite ) at Monte Adamello, Italy, in 1890, but later came to refer to quartz monzonite. The term is now deprecated. Quartz monzonite porphyry is often associated with copper mineralization in the porphyry copper ore deposits. In the White Mountains and western highlands of New Hampshire ,
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