EARTHSC 1105 Lecture Notes - Lecture 16: Archean, Death Canyon, Gabbro
15 Nov 2016
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Document Summary
Native american tribes: shoshone, bannock, blackfoot, crow, flathead, gros ventre, nez perce. ~1800 europeans explored the area: explorers and fur traders. Ultramafic rocks, gneiss and gabbro (4. 0 bya) Ultramafic crystals points is removed (but not melting: as each individual freezing / melting point is reached, that component, components of a solution / solid have different freezing / melting, more enriched mafic composition, due to fractionation. Fractionation chemical enrichment / depletion due to forming / melting of. Gneiss foliated, bands of feldspars and quartz: metamorphic rocks formed from re-crystallized pre-existing rocks. Gabbro mafic composition: igneous rocks formed from molten material. Gros ventre formation: wolsey shale, death canyon limestone, park shale. Transgression intrusion of sea level onto the land. Regression- withdraw of sea level from the land. Mostly limestone: limestone formed from caco3 producing photosynthetic organisms, sevier orogeny 150 50 mya, laramide orogeny 80 - 35 mya. 3,050 m (10,000 ft) of sandstone, shale and limestone.
