Laramide Orogeny


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Laramide orogeny

[′lar·ə·məd ȯ′räj·ə·nē]
(geology)

Laramide Orogeny

 

the aggregate of geological processes in the late Cretaceous and early Paleogene periods, including tectonic deformations, magmatism, and mountain building. It is named after the Laramie range in the eastern part of the Rocky Mountains (USA), where it was the principal age of formation of the folded-overthrust structure. It also manifested itself in the Andes in South America, in the Sikhote-Alin’, western Kamchatka, the basin of the Anadyr’ River, and in a number of folded mountain systems of the alpine belt in Eurasia. There, however, it was accompanied by younger movements. Major batholithic intrusions and small granitoid bodies and the mineralization accompanying them are associated with the Laramide orogeny.

References in periodicals archive ?
Later, one of the tectonic plates under North America's crust shifted position, building another mountain range-the Laramide Orogeny, or the infant stage of the modern-day Rocky Mountains-furthereast.
There was compression in the Grand Canyon region during the Laramide orogeny (~60-40 million years ago), and this was the time when the Colorado Plateau was uplifted almost to its present elevation and when most folding occurred.
1) From two independent lines of evidence, (30) it has been proposed that a relatively shallow central "proto" Grand Canyon formed during the Laramide orogeny (mountain-building episode 40 to 50 million years ago) when water flowed northward into a broad shallow lake in the Bryce Canyon area (Fig.
The Westwater Canyon consists of fluvial (continental) sedimentary sequence deposited during a period of wet subtropical climate as the San Juan Basin subsided and filled with synorogenic deposits during the Laramide Orogeny.
After the Laramide Orogeny of the early and middle Eocene, a series of interior drainage basins was formed in Mexico by block-faulting or volcanic-damming of drainage systems.
In the San Juan Basin, for example, sediments were deposited after the Rocky Mountains were created in the collision of an oceanic plate with North America, an event called the Laramide orogeny.