HR: 1340h
AN: V33A-1176    [Abstracts]
TI: New Insights Into Petrogenetic Processes At Kula Volcanic Province, Western Turkey
AU: * Solpuker, U
EM: solpuku@email.uc.edu
AF: Department of Geology, 345 College Court, Cincinnati, OH 45221, United States
AU: Kilinc, A I
EM: kilinc@email.uc.edu
AF: Department of Geology, 345 College Court, Cincinnati, OH 45221, United States
AB: Three episodes of alkaline volcanism of Quaternary age have been recognized in the Kula Volcanic Province (KVP) in Western Turkey. The alkaline volcanic rocks of the KVP vary in composition from basanite to tephriphonolite and from trachybasalt to basaltic trachyandesite. Measured values for ⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd in the rocks of the KVP range from 0.703029 to 0.703534 and 0.512773 to 0.512998, respectively, (Gulec, 1991; Alici, et al., 2002) suggesting that an isotopically depleted mantle component is involved in the genesis of the Kula lavas. This mantle component is also enriched in the most incompatible elements, as shown by OIB-like primitive mantle normalized multi-element patterns, this indicates that enrichment of the mantle source is probably a recent event. Generation and evolution of the Kula magmas were simulated successfully by using pMELTS algorithm (Ghiorso, et al., 2002). The fractional melting of an average spinel peridotite mantle was simulated at 23 kbar in the presence of 0.1% H₂O at fO₂ = QFM-1. The degree of partial melting is 8% for the KVP rocks and the primary magma composition is then subjected to polybaric fractional crystallization from 23 to 4 kbar. The compositional diversity displayed by the Kula volcanic rocks is reproduced successfully by the pMELTS polybaric fractionation calculations when the dP/dT gradient is set to 42 and 25 (bar/° C)in the mantle and crust, respectively, and the oxygen fugacity is increased from one log unit below to one log unit above the QFM buffer at 13 kbar.
DE: 1009 Geochemical modeling (3610, 8410)
DE: 3610 Geochemical modeling (1009, 8410)
DE: 8410 Geochemical modeling (1009, 3610)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting