High-Nb hawaiite–mugearite and high-Mg calc-alkaline lavas from northeastern Iran: Oligo-Miocene melts from modified mantle wedge
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- Parham Ahmadi
- Department of Geology, Tarbiat Modares University, Tehran, Iran
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- Mohammad Reza Ghorbani
- Department of Geology, Tarbiat Modares University, Tehran, Iran
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- Massimo Coltorti
- Department of Physics and Earth Sciences, Ferrara University, Ferrara, Italy
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- Takeshi Kuritani
- Graduate School of Science, Osaka City University, Osaka, Japan
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- Yue Cai
- Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA
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- Anna Maria Fioretti
- CNR, Istituto di Geoscienze e Georisorse, sezione di Padova, Padova, Italy
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- Eleonora Braschi
- CNR, Istituto di Geoscienze e Georisorse sezione di Firenze, Firenze, Italy
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- Pier Paolo Giacomoni
- Department of Physics and Earth Sciences, Ferrara University, Ferrara, Italy
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- Farzaneh Aghabazaz
- Department of Geology, Tarbiat Modares University, Tehran, Iran
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- Shahrouz Babazadeh
- Department of Geology, Tarbiat Modares University, Tehran, Iran
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- Sandro Conticelli
- CNR, Istituto di Geoscienze e Georisorse sezione di Firenze, Firenze, Italy
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説明
Tertiary volcanic rocks in northwestern Firoozeh, Iran (the Meshkan triangular structural unit), constitute vast outcrops (up to 250 km2) of high-Mg basaltic andesites to dacites that are associated with high-Nb hawaiites and mugearites. Whole-rock 40Ar/39Ar ages show a restricted range of 24.1 ± 0.4-22.9 ± 0.5 Ma for the volcanic rocks. The initial ratios of 87Sr/86Sr and 143Nd/144Nd vary from 0.703800 to 0.704256 and 0.512681 to 0.512877, respectively, in the high-Mg basaltic andesites-dacites. High-Th contents (up to 11 ppm) and Sr/Y values (27-100) and the isotopic composition of the subalkaline high-Mg basaltic andesites-dacites indicate derivation from a mantle modified by slab and sediment partial melts. Evidence such as reverse zoning and resorbed textures and high Ni and Cr contents in the evolved samples indicate that magma mixing with mafic melts and concurrent fractional crystallization lead to the compositional evolution of this series. The high-Nb hawaiites and mugearites, by contrast, have a sodic alkaline affinity and are silica undersaturated; they are also enriched in Nb (up to 47 ppm) and a wide range of incompatible trace elements, including LILE, LREE, and HFSE. Geochemistry and Sr- Nd isotopic compositions of the high-Nb hawaiites and mugearites suggest derivation from a mantle source affected by lower degrees of slab melts. Post-orogenic slab break-off is suggested to have prompted the asthenospheric upwelling that triggered partial melting in mantle metasomatized by slab-derived melts.
収録刊行物
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- International Geology Review
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International Geology Review 61 (2), 150-174, 2017-12-22
Informa UK Limited
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キーワード
- High-Nb hawaiites–mugearites; high-Mg basaltic andesites–dacites; slab melt metasomatism; adakitic; magma mixing; slab break-off; northeastern Iran
- High-Nb hawaiites-mugearites; high-Mg basaltic andesites-dacites; slab melt metasomatism; adakitic; magma mixing; slab break-off; northeastern Iran
- slab melt metasomatism,
- magma mixing,
- High-Nb hawaiites-mugearites,
- slab break-off,
- high-Mg basaltic andesites-dacites,
- adakitic,
- High-Nb hawaiites–mugearites, high-Mg basaltic andesites–dacites, slab melt metasomatism, adakitic, magma mixing, slab break-off, northeastern Iran
- northeastern Iran
詳細情報 詳細情報について
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- CRID
- 1360567183980906752
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- ISSN
- 19382839
- 00206814
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE