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Schematic diagram showing the physical processes inside the Earth that lead to the generation of magma. Partial melting begins above the fusion point. Map showing approximate location of many current hotspots and the relationship to current tectonic plates and their boundaries and movement vectors
The Emperor and Hawaiian chains are separated by a large L-shaped bend that causes the orientations of the chains to differ by about 60 degrees. This bend was long attributed to a relatively sudden change in the direction of plate motion, but research conducted in 2003 suggests that it was the movement of the hotspot itself that caused the bend ...
It is observed in combination with green serpentine at Stichtite Hill near the Dundas Extended Mine, Dundas – east of Zeehan, as well as on the southern shore of Macquarie Harbour. It is exhibited in the West Coast Pioneers Museum in Zeehan. The only commercial mine for stichtite serpentine is located on Stichtite Hill [citation needed].
For convenience the Rocky Mountain Trench may be divided into northern and southern sections. The dividing point reflects the separation of north and easterly flows to the Arctic Ocean versus south and westerly flows to the Pacific Ocean. A break in the valley system at around 54°N near Prince George, British Columbia may be used for this ...
Bowenite, a variety of antigorite, is an especially hard serpentine (5.5) of light to dark apple green color, often mottled with cloudy white patches and darker veining. It is the serpentine most frequently encountered in carving and jewelry. The name 'retinalite' is sometimes applied to yellow bowenite. The New Zealand material is called tangiwai.
The Kodiak–Bowie Seamount chain, also called the Pratt–Welker Seamount chain and the Kodiak Seamounts is a seamount chain in the southeastern Gulf of Alaska stretching from the Aleutian Trench in the north to Bowie Seamount, the youngest volcano in the chain, which lies 180 km (112 mi) west of Haida Gwaii, British Columbia, Canada. [1]
The New England Seamounts is a chain of over twenty underwater extinct volcanic mountains known as seamounts. [1] This chain is located off the coast of Massachusetts in the Atlantic Ocean and extends over 1,000 kilometers (600 mi) from the edge of Georges Bank. Many of the peaks of these mountains rise over 4,000 meters (13,000 ft) from the ...
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