Open-system behaviour of magmatic fluid phase and transport of copper in arc magmas at Krakatau and Batur volcanoes, Indonesia

The role of magmatic reaction, diffusion, and annealing in the evolution of coronitic microstructure in troctolitic gabbro from Risör, Norway: a discussion

Mineralogical Magazine ◽

10.1180/minmag.1986.050.357.09 ◽

1986 ◽

Vol 50 (357) ◽

pp. 469-473 ◽

Cited By ~ 27

Author(s):

J. R. Ashworth

Keyword(s):

Solid State ◽

Open System ◽

Local Equilibrium ◽

Reaction Diffusion ◽

One Dimension ◽

System Behaviour ◽

Diffusion Controlled

AbstractThe data of Joesten (1986) are re-interpreted. The petrography of the coronas is not consistent with magrnatic origin. Both microstructural types described by Joesten (1986), here re-named ‘columnar’ and ‘tabular’, formed by solid-state replacement of plagioclase and of adjacent olivine or ilmenite. Tabular microstructures are not annealed, but result from overgrowth or epitaxy of amphibole and pyroxene on pre-existing grains. Since the diffusion-controlled models of Joesten (1986) can account for major aspects of the coronas, it seems possible that a slightly modified, less simplified theory might explain them fully. Open-system behaviour must be admitted, with some constraints provided by symplectites. It may also be necessary to develop the theory in more than one dimension, and to allow for departures from local equilibrium at layer boundaries.

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Chemical characteristics of fluid phase released from a subducted lithosphere and origin of arc magmas: Evidence from high-pressure experiments and natural rocks

Journal of Volcanology and Geothermal Research ◽

10.1016/0377-0273(86)90049-1 ◽

1986 ◽

Vol 29 (1-4) ◽

pp. 293-309 ◽

Cited By ~ 667

Author(s):

Y. Tatsumi ◽

D.L. Hamilton ◽

R.W. Nesbitt

Keyword(s):

High Pressure ◽

Fluid Phase ◽

Chemical Characteristics ◽

Arc Magmas

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RbSr open-system behaviour and its application as a pathfinder for Sn mineralisation in granites of the Bushveld Complex, South Africa

Journal of Geochemical Exploration ◽

10.1016/0375-6742(90)90107-l ◽

1990 ◽

Vol 37 (3) ◽

pp. 333-350 ◽

Cited By ~ 3

Author(s):

F. Walraven ◽

J.H. Strydom ◽

N. Strydom

Keyword(s):

South Africa ◽

Open System ◽

Bushveld Complex ◽

System Behaviour

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Forecasting of open system behaviour

International Journal of Systems Science ◽

10.1080/00207729708929379 ◽

1997 ◽

Vol 28 (2) ◽

pp. 201-209

Author(s):

S. Z. STEFANOV

Keyword(s):

Open System ◽

System Behaviour

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Uranium/thorium dating of late pleistocene peat deposits in NW Europe, uranium/thorium isotope systematics and open-system behaviour of peat layers

Chemical Geology Isotope Geoscience section ◽

10.1016/0168-9622(92)90009-y ◽

1992 ◽

Vol 94 (3) ◽

pp. 161-171 ◽

Cited By ~ 11

Author(s):

H. Heijnis ◽

J. van der Plicht

Keyword(s):

Late Pleistocene ◽

Open System ◽

System Behaviour ◽

Peat Deposits ◽

Thorium Isotope ◽

Isotope Systematics ◽

Nw Europe

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Mineralogical Constraints on the Potassic and Sodic-Calcic Hydrothermal Alteration and Vein-Type Mineralization of the Maronia Porphyry Cu-Mo ± Re ± Au Deposit in NE Greece

Minerals ◽

10.3390/min10020182 ◽

2020 ◽

Vol 10 (2) ◽

pp. 182 ◽

Cited By ~ 2

Author(s):

Vasilios Melfos ◽

Panagiotis Voudouris ◽

Margarita Melfou ◽

Matías G. Sánchez ◽

Lambrini Papadopoulou ◽

...

Keyword(s):

Fluid Flow ◽

Fluid Phase ◽

Aqueous Fluid ◽

Gas Content ◽

Magmatic Fluid ◽

Brittle Deformation ◽

Fluid Circulation ◽

Magmatic Rocks ◽

Vein Type ◽

Host Rocks

The Maronia Cu-Mo ± Re ± Au deposit is spatially related to a microgranite porphyry that intruded an Oligocene monzonite along the Mesozoic Circum-Rhodope belt in Thrace, NE Greece. The magmatic rocks and associated metallic mineralization show plastic and cataclastic features at the south-eastern margin of the deposit that implies emplacement at the ductile-brittle transition, adjacent to a shear zone at the footwall of the Maronia detachment fault. The conversion from ductile to brittle deformation caused a rapid upward magmatic fluid flow and increased the volume of water that interacted with the host rocks through high permeable zones, which produced extensive zones of potassic and sodic-calcic alteration. Potassic alteration is characterized by secondary biotite + K-feldspar (orthoclase) + magnetite + rutile + quartz ± apatite and commonly contains sulfides (pyrite, chalcopyrite, pyrrhotite). Sodic-calcic alteration consists of actinolite + sodic-calcic plagioclase (albite/oligoclase/andesine) + titanite + magnetite + chlorite + quartz ± calcite ± epidote-allanite. The high-oxidation state of the magmas and the hydrothermal fluid circulation were responsible for the metal and sulfur enrichments of the aqueous fluid phase, an increase in O2 gas content, the breakdown of the magmatic silicates and the production of the extensive potassic and sodic-calcic alterations. Brittle deformation also promoted the rapid upward fluid flow and caused interactions with the surrounding host rocks along the high temperature M-, EB-, A- and B-type veins.

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