A Geology of Vancouver

Provide a 12 pages analysis while answering the following question: A Geology of Vancouver. Prepare this assignment according to the guidelines found in the APA Style Guide. An abstract is required. Basalt rocks are fine-grained igneous rocks, black in color and rich in calcium feldspar. These rocks are comprised of minerals plagioclase feldspar, pyroxene, olivine, and magnetite. The partial melting of the upper mantle periodate’s chief rock leads to the formation of the basalt rocks. Most of the ocean crust and 90% of the volcanoes are made of basalt rocks (Lambert & The Diagram Group, 2007, p. 60). These rocks occur in three forms in Vancouver –dykes, sills, and lava flows.

Dykes are layers like volcanic incursions that cut older rocks and form much of Siwask rock in Stanley Park. Sills are incursions that are equivalent to the stratum in sedimentary or metamorphic rocks (Clague & Turner, 2003, pp. 29 & 175).Cordilleran Ice sheet The earth froze when glaciers in Western Canada’s high mountains evolved during the preliminary stage of the glacial cycle.

When these glaciers progressed beyond mountain fronts and united over lowlands and plateaus, which happened throughout thousands of years, an enormous sheet of ice was named the Cordilleran ice sheet. It lay to the west of Vancouver and covered a large area of North America during the glacial periods of Quaternary (Clague & Turner, 2003, p. 38).

According to research, the Cordilleran ice sheet covered up to two and a half million square kilometers at the Last Glacial Maximum and perhaps more than that in some preceding phases. Today it covers almost all British Columbia and Southern Yukon Territory (Cordilleran Ice sheet, n.d).

Debris Flows Under the force of gravity, moving masses of sand, rocks, soil, loose mud, water, and air are transported down steep slopes called the debris flows. These substances can be anything from finely powdered rocks to mighty boulders are also pushed down by melting glaciers and ice sheets. The debris cast off by glaciers is generally an unsorted heap of stones and rocks entrenched in a sandy, clayey medium known as till or boulder clay. Some debris flows are slow, making small internal movements of just one to two feet per year. However, some high-speed flows – traveling down at 100 miles per hour in regions with very steep slopes.

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