Wet and dry basalt magma evolution in Torishima volcano, Izu–Bonin arc, Japan: The possible role of phengite

2006 ◽  
Vol 70 (18) ◽  
pp. A635
Author(s):  
Y. Tamura ◽  
K. Tani ◽  
Q. Chang ◽  
H. Shukuno ◽  
H. Kawabata ◽  
...  
Keyword(s):  
Basalt Magma ◽  
Magma Evolution

scholarly journals Wet and Dry Basalt Magma Evolution at Torishima Volcano, Izu–Bonin Arc, Japan: the Possible Role of Phengite in the Downgoing Slab

2007 ◽  
Vol 48 (10) ◽  
pp. 1999-2031 ◽  
Author(s):  
Y. Tamura ◽  
K. Tani ◽  
Q. Chang ◽  
H. Shukuno ◽  
H. Kawabata ◽  
...  
Keyword(s):  
Basalt Magma ◽  
Magma Evolution

scholarly journals U-Pb zircon and titanite ages and Sr-Nd-Hf isotope constraints on the timing and evolution of the Petrohan-Mezdreya pluton (Western Balkan Mts, Bulgaria)

2018 ◽  
Vol 47 (2) ◽  
pp. 25-46
Author(s):  
Irena Peytcheva ◽  
Elena Tacheva ◽  
Albrecht von Quadt ◽  
Rossen Nedialkov
Keyword(s):  
Early Carboniferous ◽  
Variscan Orogeny ◽  
Magma Evolution ◽  
Mixing Processes ◽  
Icp Ms ◽  
Younger Age ◽  
Incremental Growth ◽  
Combination Of Methods ◽  
Geochemical Studies

A combination of methods is applied in the present study to define the exact age of the Petrohan and Mezdreya plutons and trace their magma evolution. Field, petrological, and geochemical studies of the Petrohan pluton revealed its complex evolution and emphasized the role of magma mingling and mixing, complementary to the normal assimilation and fractional crystallization (AFC) processes. Using high-precision conventional U-Pb (CA)-ID-TIMS zircon and titanite dating in combination with CA-LA-ICP-MS zircon dating and tracing, we suggest an incremental growth of a common Petrohan-Mezdreya pluton. It was assembled over minimum 4.5 Ma from 311.14±0.48 Ma to 307.54±0.54 Ma. The younger age of the gabbro (308.12±0.33 Ma), compared with the age of granodiorites (311.14±0.48 Ma), provides numerical proofs for magma replenishment during the assembling of the Petrohan pluton. Whole-rock strontium-neodymium (initial 87Sr/86Sr ratios of 0.70521–0.70527 to 0.70462 and 143Nd/144Nd of 0.51221 to 0.51210) and Hf-zircon isotope data (ε-Hf from –5.8 to +3.6) argue for interaction of mantle derived magma with crustal melts but also mixing and mingling and transfer of zircon grains between the gabbroic and granitic melts. Possible petrogenetic scenario includes melting of subcontinental mantle lithosphere and crust and evolution trough AFC, FC and mingling/mixing processes. Considering the Petrohan-Mezdreya pluton as part of the Variscan orogeny in SE Europe, our new data support the accretion/collision of both the Balkan and Sredna Gora/Getic units with Moesia in the Early Carboniferous followed by syn- and post-collisional Carboniferous and Permian magmatism.

Role of large flank-collapse events on magma evolution of volcanoes. Insights from the Lesser Antilles Arc

2013 ◽  
Vol 263 ◽  
pp. 224-237 ◽  
Author(s):  
Georges Boudon ◽  
Benoît Villemant ◽  
Anne Le Friant ◽  
Martine Paterne ◽  
Elsa Cortijo
Keyword(s):  
Lesser Antilles ◽  
Magma Evolution ◽  
Flank Collapse ◽  
Lesser Antilles Arc

The role of fluorine in carbonatite magma evolution

Nature ◽  
1991 ◽  
Vol 349 (6304) ◽  
pp. 56-58 ◽  
Author(s):  
Bruce C. Jago ◽  
John Gittins
Keyword(s):  
Magma Evolution ◽  
Carbonatite Magma

The role of CO2 in alkali rock genesis

1976 ◽  
Vol 113 (2) ◽  
pp. 97-113 ◽  
Author(s):  
N. M. S. Rock
Keyword(s):  
Trace Element ◽  
Alkali Basalt ◽  
High Pressures ◽  
Alkaline Rock ◽  
Basalt Magma ◽  
Isotopic Data ◽  
Calcic Plagioclase ◽  
Basaltic Magmas ◽  
Normal Differentiation

SummaryThe extreme rarity of alkaline rock suites bearing both calcic plagioclase and magmatic carbonatites is believed to reflect a fundamental bifold division between Gabbroic and Carbonatitic types, plagioclase being present only in the former and carbonatite only in the latter. Alkali basalt magma may be parental to both lineages, the gabbroic lineage deriving from normal differentiation under low CO2 pressure, and the carbonatitic by suppression of plagioclase crystallization under high pressures of CO2, leading through pyroxene fractionation to a ‘secondary parental’ olivine-poor nephelinite magma. Support for this hypothesis is found in evidence for the suppression of plagioclase in CO2-rich alkali basaltic magmas and for the secondary origin of olivine-poor nephelinites, in the nature of xenoliths and cumulates at carbonatite complexes, in Sr isotopic data, and in major and trace element compositions of the magmas. The possible origin of melilitic rocks at carbonatite complexes is also briefly discussed.

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