ASSIMILATION - FRACTIONAL CRYSTALLIZATION (AFC) IMPACT IN THE EVOLUTION OF TERTIARY ALKALI VOLCANISM IN TALEGHAN

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AHMADI A.R.; GHORBANI M.R.; TIEPOLO M.

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Journal: Iranian Journal of Geology Year:2011 | Volume:4 | Issue:16 Page(s): 75-96

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Title

ASSIMILATION - FRACTIONAL CRYSTALLIZATION (AFC) IMPACT IN THE EVOLUTION OF TERTIARY ALKALI VOLCANISM IN TALEGHAN

Author(s)

AHMADI A.R. | GHORBANI M.R. | TIEPOLO M. | Issue Writer Certificate

Keywords

ALKALI BASALT

TEPHRITE

POSTOROGENIC MAGMATISM

SPINEL LERZOLITE

CRUSTAL ASSIMILATION

Abstract

Tertiary volcanism in the Taleghan area is marked by a thick sequence of ALKALI BASALTic volcanics that is followed by tephritic volcanics. Trace elements geochemistry of these volcanics indicates a postorogenic extensional geodynamic, possibly due to the continental collision following the subduction of the Arabian and the Iranian plates. This study suggests derivation of both volcanics from a single parental magma. Trace element modeling suggests derivation of this parental magma by 15% partial melting of a spinel–lherzolite source at the depth of 60 to 65 Km. The trace element systematic, along with petrographic evidence, suggests that 45 to 50 % fractional crystallization controlled the ALKALI BASALT evolutionary paths. The fractionating phases and their proportions are: clinopyroxene (45%) +olivine (25%) +plagioclase (25%) +magnetite (5%). Tephritic magma can be produced by about 65% fractional crystallization of the same mineral assemblages together with crustal contamination by amphibolites facies country rocks. Assimilation-fractional crystallization (AFC) modeling reveals significant but variable degrees of crustal contamination in the evolution of the magma to product tephritic rocks with a range of r values (assimilation rate/crystallization rate) from 0.15 to 0.45.

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APA: Copy

AHMADI, A.R., GHORBANI, M.R., & TIEPOLO, M.. (2011). ASSIMILATION - FRACTIONAL CRYSTALLIZATION (AFC) IMPACT IN THE EVOLUTION OF TERTIARY ALKALI VOLCANISM IN TALEGHAN. IRANIAN JOURNAL OF GEOLOGY, 4(16), 75-96. SID. https://sid.ir/paper/581040/en

Vancouver: Copy

AHMADI A.R., GHORBANI M.R., TIEPOLO M.. ASSIMILATION - FRACTIONAL CRYSTALLIZATION (AFC) IMPACT IN THE EVOLUTION OF TERTIARY ALKALI VOLCANISM IN TALEGHAN. IRANIAN JOURNAL OF GEOLOGY[Internet]. 2011;4(16):75-96. Available from: https://sid.ir/paper/581040/en

IEEE: Copy

A.R. AHMADI, M.R. GHORBANI, and M. TIEPOLO, “ASSIMILATION - FRACTIONAL CRYSTALLIZATION (AFC) IMPACT IN THE EVOLUTION OF TERTIARY ALKALI VOLCANISM IN TALEGHAN,” IRANIAN JOURNAL OF GEOLOGY, vol. 4, no. 16, pp. 75–96, 2011, [Online]. Available: https://sid.ir/paper/581040/en

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