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Pikes Peak granite : ウィキペディア英語版 | Pikes Peak granite
The Pikes Peak granite is a widespread geologic formation found in the central part of the Front Range of Colorado. The granite gets its name from the mountain Pikes Peak, which is made up almost entirely of the distinctive, brick-red rock. Pikes Peak itself is only a small part of a much larger formation known as the Pikes Peak batholith. ==Origin== About 1.08 billion years ago, a large pool of magma formed under what is now central Colorado. Some of this magma worked its way to the surface and formed volcanoes. After the volcanic activity died away, a large mass of molten magma was left underground. Because the magma was buried about 2 miles (5 km) underground, it took thousands of years for it to cool and this created the granite that we now see on the slopes of Pikes Peak and other areas of the Front Range.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Pikes Peak granite」の詳細全文を読む
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