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The Chilliwack Batholith is a large batholith that forms much of the North Cascades in southwestern British Columbia, Canada and the U.S. state of Washington. The geological structure is named after the Chilliwack River Valley, where it outcrops in many places.
The Chilliwack Batholith forms much of the North Cascades in southwestern British Columbia, Canada and the U.S. state of Washington. The geological structure is primarily named after the City of Chilliwack, where it is the most notable geological feature.
The first volcanic event 29 million years ago formed intrusive rocks of the large Chilliwack batholith, which extends south into the U.S. state of Washington. [1] [9] In Canada, the batholith consists of rocks ranging from hypersthene quartz gabbro to albite granite. Three main plutons are present.
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In the southeast, there is a series of small terranes of both oceanic (Bridge River Vent and Chilliwack Batholith) and continental affinity (Jack Konat Mountain, Ladner). The hard-weathering granite is extensively rugged throughout the belt.
The greatest mass of exposed Cascade Arc plumbing is the Chilliwack batholith, which makes up much of the northern part of North Cascades National Park and adjacent parts of British Columbia beyond. Individual plutons range in age from about 35 million years old to 2.5 million years old.
A batholith (from Ancient Greek bathos 'depth' and lithos 'rock') is a large mass of intrusive igneous rock (also called plutonic rock), larger than 100 km 2 (40 sq mi) in area, [1] that forms from cooled magma deep in the Earth's crust.
Mount Grant is related to the Chilliwack batholith, which intruded the region 26 to 29 million years ago after the major orogenic episodes in the region. This is part of the Pemberton Volcanic Belt, an eroded volcanic belt that formed as a result of the subduction of the Farallon Plate starting 29 million years ago.