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Melang and igneous rock formaaon at subducaon zones

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Unformatted text preview: molten rock 3)  Add water solid rock Pressure Pressure- Temperature (P- T) phase diagrams and melAng of igneous rocks Temperature dry melAng curve Three basic ways to melt rocks: 1)  Increase temperature 2)  Decrease pressure molten rock 3)  Add water wet melAng curve solid rock Pressure Pressure and Temperature both increase as one moves deeper into the Earth A’ Temperature, Pressure A A Depth A’ rag antle d m mantle d ra g Basalt may form largely by decompression melAng at mid- Ocean ridges. It is a ‘primiAve’ rock type produced at mid- ocean ridges, at hot- spots (e.g., Hawaii), and someAmes on the conAnents. Ocean crust is primarily composed of basalt and its intrusive equivalent, gabbro. ‘mantle as homogenous, li[le- changed reservoir’ Basalt is formed by parAal melAng of mantle rocks, mainly (Mg,Fe)SiO3 Basalt- like rocks were the first rocks on Earth, a...
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