Английская Википедия:Cape Mountain

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Cape Mountain (Inupiaq: Kiŋigin) is located Шаблон:Convert southeast of Cape Prince of Wales on the Seward Peninsula in the U.S. state of Alaska. It was named by the surveyor, Alfred Hulse Brooks, in 1900.Шаблон:Sfn

Geography

Cape Mountain on Cape Prince of Wales is the northern terminus point of the Continental Divide of the Americas.Шаблон:Sfn At one time, it was considered to be the most western point of the United States.Шаблон:Sfn The mountain's elevation is Шаблон:Convert, with a sharp peak Шаблон:Convert above the York Plateau, and a well-marked bench formation at Шаблон:Convert;Шаблон:Sfn the east base has an elevation below Шаблон:Convert.Шаблон:Sfn There is a sharp pinnacle at its western edge. Tin City developed on the southeastern side, while Kingegan is situated to the northwest;Шаблон:Sfn Teller is Шаблон:Convert to the southeast.Шаблон:Sfn Cape Creek has its headwaters on the mountain's eastern side and flows southward for approximately Шаблон:Convert until it reaches the Bering Sea at Tin City. The west fork's headwaters are in the mountain's uplands while the east fork's headwaters flow against the continental divide; a tributary, First Chance Creek, enters near Cape Creek's mouth.

Geology

Granites and fine grained porphyries are the geological formations recorded in the mountain, which are very much jointed.Шаблон:SfnШаблон:Sfn From the geological map of the mountain it is noted that granite formations are massive and crystalline which has generated distinctive topographic features. The crest and the pinnacles are of granite rock with double system of jointing.Шаблон:Sfn Feldspar crystals are seen at the margin of these massive formations. The granites are coarse crystalline normally porphyritic, and basically with geological formations of quartz, microcline and biotite. Local glaciation has been recorded on the mountain.Шаблон:Sfn There is also a belt of limestone inferred as belonging to the Kigluaik series.Шаблон:Sfn White limestone formations are inferred as intrusives and its formations on the western side of the mountain dip away from granite.Шаблон:Sfn While driving a Шаблон:Convert long adit from an elevation of Шаблон:Convert into the Cape Mountain, close to the peak, for prospecting for minerals, biotite granite formation of the hill revealed cassiterite-bearing quartz of the Late Cretaceous period. The evolution of the Cape Mountain granite has been "determined to be 78.8 +/- 2.9 my old by the K/Ar method".

Mineral prospecting

Tin lodes have been prospected in the mountain. Tin ore was discovered in July 1902 by W.C.J.Bartels, but attempts to explore the mountains proved unsuccessful as the engine set up at the beach, near what is now Tin City, was defective.Шаблон:Sfn The mountain has placer concentrates of radioactive minerals of monazite, xenotine, and zircon. The concentrates have 0.9 percent equivalent uranium (averaging about 0.03 percent equivalent uranium) attributed to thorium in the monazite content. It is inferred that the radioactive minerals found could be due to the granite formations of the mountain or to the tin deposits found in the region.

References

Bibliography

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