GEOL 1 Lecture Notes - Lecture 6: Pyroxene, Lithification, Albite
Document Summary
You look at rocks in an area and they"re dark/mafic, are they dangerous and explosive? . Question #39: borates are the most important economical resource in southern california. We are the 2nd largest producers of borates in the world. Igneous rocks may cool deep beneath the surface, forming plutonic rocks, or be erupted onto the surface, forming volcanic rocks. Igneous rocks: cool fast, small crystals, form when molten rock (magma) in the earth"s interior rises to the surface through pipes or fractures in the crust. Cool slow, large crystals: form when magma cools within the earth. Igneous rocks that cool below the earth"s surface are termed plutonic (or intrusive) igneous rocks. Dark colors: high temperatures (1000 to 1200 degrees. Gabbro: thin and runny magma, less common. Norman bowen, a petrologist, examined hundreds of rock specimens, and showed that they all showed a similar sequence of crystallization.
