Is called a pressure temperaturepressure

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Unformatted text preview: mperaturepressure-temperaturetime or P-T-t path q q P-T-t paths for the subducted crust in a variety of arc scenarios P-T-t subducted numerically modeled by Peacock (1990, 1991) numerically All curves are based on a subduction rate of 3 cm/yr, so the All length of each curve represents about 15 Ma length Subducted Crust The yellow P-T-t The yellow paths represent various arc ages arc Figure 16-16. Subducted crust pressure-temperature-time (PT-t) paths for various situations of arc age (yellow curves) and age of subducted lithosphere (red curves, for a mature ca. 50 Ma old arc) assuming a subduction rate of 3 cm/yr (Peacock, 1991, Phil. Trans. Roy. Soc. London, 335, 341-353). Red curves = age of the subducted slab Red Subducted Crust Figure 16-16. Subducted crust pressure-temperature-time (PT-t) paths for various situations of arc age (yellow curves) and age of subducted lithosphere (red curves, for a mature ca. 50 Ma old arc) assuming a subduction rate of 3 cm/yr (Peacock, 1991, Phil. Trans. Roy. Soc. London, 335, 341-353). Now add the solidi for dry and water-saturated melting of basalt Subducted Crust Figure 16-16. Subducted crust pressure-temperature-time (PT-t) paths for various situations of arc age (yellow curves) and age of subducted lithosphere (red curves, for a mature ca. 50 Ma old arc) assuming a subduction rate of 3 cm/yr (Peacock, 1991). Included are some pertinent reaction curves, including the wet and dry basalt solidi (Figure 7-20), the dehydration of hornblende (Lambert and Wyllie, 1968, 1970, 1972), chlorite + quartz (Delaney and Helgeson, 1978). Winter (2001). An Introduction to Igneous and Metamorphic Petrology. Prentice Hall. 1. Dehydration D and liberation of water takes place (mature arcs 1. with lithosphere > 25 Ma old) with 2. Slab melting M melting occurs arcs subducting young lithosphere, as dehydration of chlorite or amphibole release water above the wet above solidus to form Mgsolidus rich andesites rich directly. Subducted Crust q q q The LIL/...
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