NissirosV1, Main, Exploration, bibRecord, 000302

Geochemical effects of decoupled fractional crystallization and crustal assimilation

Identifieur interne : 000302 ( Main/Exploration ); précédent : 000301; suivant : 000303

Geochemical effects of decoupled fractional crystallization and crustal assimilation

Auteurs : J. W. Cribb ; M. Barton

Source :

Lithos [ 0024-4937 ] ; 1996.

RBID : ISTEX:26F8E24266866670D99FDB53D9FB8E6279C4ABE1

Descripteurs français

Wicri :
- topic : Essence, Oligoélément.

English descriptors

KwdEn :
- Analytical uncertainties, Andesite, Assimilant, Assimilants, Assimilation, Basalt, Basaltic, Basaltic andesites, Basaltic magma, Chemical variations, Compatible element concentrations, Compatible elements, Continental crust, Contrib, Cribb, Crust, Crustal, Crystallization, Daughter magma, Daughter magmas, Decoupled, Earth planet, Fractional, Fractional crystallization, Geochemical, Huijsmans, Hybrid, Hybrid magmas, Ilias, Incompatible, Incompatible element ratios, Incompatible elements, Isotopic, Isotopic compositions, Isotopic data, Isotopic ratios, Lava, Lower crust, Magma, Magma evolution, Mash zones, Mclennan, Medicine lake volcano, Mineral petrol, Mineral phases, Modeling, Nielsen, Ohio state university, Parental, Parental basalt, Parental magma, Parental magmas, Petrol, Primitive basalt, Profitis ilias, Santorini, Santorini basalt, Sixth cycles, Total iron, Trace element, Trace elements, Upper crust, Volcanic centers, Volcano, Wyers.
Teeft :
- Analytical uncertainties, Andesite, Assimilant, Assimilants, Assimilation, Basalt, Basaltic, Basaltic andesites, Basaltic magma, Chemical variations, Compatible element concentrations, Compatible elements, Continental crust, Contrib, Cribb, Crust, Crustal, Crystallization, Daughter magma, Daughter magmas, Decoupled, Earth planet, Fractional, Fractional crystallization, Geochemical, Huijsmans, Hybrid, Hybrid magmas, Ilias, Incompatible, Incompatible element ratios, Incompatible elements, Isotopic, Isotopic compositions, Isotopic data, Isotopic ratios, Lava, Lower crust, Magma, Magma evolution, Mash zones, Mclennan, Medicine lake volcano, Mineral petrol, Mineral phases, Modeling, Nielsen, Ohio state university, Parental, Parental basalt, Parental magma, Parental magmas, Petrol, Primitive basalt, Profitis ilias, Santorini, Santorini basalt, Sixth cycles, Total iron, Trace element, Trace elements, Upper crust, Volcanic centers, Volcano, Wyers.

Abstract

Abstract: Most models of crustal assimilation assume that the amount of assimilant added to the magma is proportional to each infinitesimally small amount of solid removed during crystallization (AFC). In some magmatic systems, however, assimilation and crystallization are not strictly related and the mass assimilated is decoupled from, and therefore varies independently of, the mass crystallized (FCA). The geochemical consequences of FCA are examined and compared to those of AFC. The behavior of incompatible elements is identical during AFC and FCA, and ratios of these elements do not allow discrimination between the two processes. Major-oxide least-squares mass-balance models do not discriminate between AFC and FCA at F ≥ 0.7 (F = fraction of melt remaining). However, FCA yields magmas richer in compatible elements and with higher Sr-isotopic ratios than AFC at a given value of F. Repeated cycles of FCA and AFC combined with magma mixing (FAM) may result in unusual geochemical trends, such as the evolution of a calc-alkaline basaltic parent to a tholeiitic daughter magma, or the evolution of low- and medium-K calc-alkaline basalts to high-K andesites, dacites, trachyandesites or trachydacites. Lavas erupted by the volcano Micro Profitis Ilias on Santorini, Hellenic arc, Greece, provide an example of magmas which evolved by combined fractionation, assimilation by FCA and mixing.

Url:

https://api.istex.fr/document/26F8E24266866670D99FDB53D9FB8E6279C4ABE1/fulltext/pdf

DOI: 10.1016/0024-4937(95)00027-5

Affiliations:

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Le document en format XML

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<term>Andesite</term>
<term>Assimilant</term>
<term>Assimilants</term>
<term>Assimilation</term>
<term>Basalt</term>
<term>Basaltic</term>
<term>Basaltic andesites</term>
<term>Basaltic magma</term>
<term>Chemical variations</term>
<term>Compatible element concentrations</term>
<term>Compatible elements</term>
<term>Continental crust</term>
<term>Contrib</term>
<term>Cribb</term>
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<term>Daughter magmas</term>
<term>Decoupled</term>
<term>Earth planet</term>
<term>Fractional</term>
<term>Fractional crystallization</term>
<term>Geochemical</term>
<term>Huijsmans</term>
<term>Hybrid</term>
<term>Hybrid magmas</term>
<term>Ilias</term>
<term>Incompatible</term>
<term>Incompatible element ratios</term>
<term>Incompatible elements</term>
<term>Isotopic</term>
<term>Isotopic compositions</term>
<term>Isotopic data</term>
<term>Isotopic ratios</term>
<term>Lava</term>
<term>Lower crust</term>
<term>Magma</term>
<term>Magma evolution</term>
<term>Mash zones</term>
<term>Mclennan</term>
<term>Medicine lake volcano</term>
<term>Mineral petrol</term>
<term>Mineral phases</term>
<term>Modeling</term>
<term>Nielsen</term>
<term>Ohio state university</term>
<term>Parental</term>
<term>Parental basalt</term>
<term>Parental magma</term>
<term>Parental magmas</term>
<term>Petrol</term>
<term>Primitive basalt</term>
<term>Profitis ilias</term>
<term>Santorini</term>
<term>Santorini basalt</term>
<term>Sixth cycles</term>
<term>Total iron</term>
<term>Trace element</term>
<term>Trace elements</term>
<term>Upper crust</term>
<term>Volcanic centers</term>
<term>Volcano</term>
<term>Wyers</term>
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<term>Assimilant</term>
<term>Assimilants</term>
<term>Assimilation</term>
<term>Basalt</term>
<term>Basaltic</term>
<term>Basaltic andesites</term>
<term>Basaltic magma</term>
<term>Chemical variations</term>
<term>Compatible element concentrations</term>
<term>Compatible elements</term>
<term>Continental crust</term>
<term>Contrib</term>
<term>Cribb</term>
<term>Crust</term>
<term>Crustal</term>
<term>Crystallization</term>
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<term>Daughter magmas</term>
<term>Decoupled</term>
<term>Earth planet</term>
<term>Fractional</term>
<term>Fractional crystallization</term>
<term>Geochemical</term>
<term>Huijsmans</term>
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<term>Hybrid magmas</term>
<term>Ilias</term>
<term>Incompatible</term>
<term>Incompatible element ratios</term>
<term>Incompatible elements</term>
<term>Isotopic</term>
<term>Isotopic compositions</term>
<term>Isotopic data</term>
<term>Isotopic ratios</term>
<term>Lava</term>
<term>Lower crust</term>
<term>Magma</term>
<term>Magma evolution</term>
<term>Mash zones</term>
<term>Mclennan</term>
<term>Medicine lake volcano</term>
<term>Mineral petrol</term>
<term>Mineral phases</term>
<term>Modeling</term>
<term>Nielsen</term>
<term>Ohio state university</term>
<term>Parental</term>
<term>Parental basalt</term>
<term>Parental magma</term>
<term>Parental magmas</term>
<term>Petrol</term>
<term>Primitive basalt</term>
<term>Profitis ilias</term>
<term>Santorini</term>
<term>Santorini basalt</term>
<term>Sixth cycles</term>
<term>Total iron</term>
<term>Trace element</term>
<term>Trace elements</term>
<term>Upper crust</term>
<term>Volcanic centers</term>
<term>Volcano</term>
<term>Wyers</term>
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<front><div type="abstract" xml:lang="en">Abstract: Most models of crustal assimilation assume that the amount of assimilant added to the magma is proportional to each infinitesimally small amount of solid removed during crystallization (AFC). In some magmatic systems, however, assimilation and crystallization are not strictly related and the mass assimilated is decoupled from, and therefore varies independently of, the mass crystallized (FCA). The geochemical consequences of FCA are examined and compared to those of AFC. The behavior of incompatible elements is identical during AFC and FCA, and ratios of these elements do not allow discrimination between the two processes. Major-oxide least-squares mass-balance models do not discriminate between AFC and FCA at F ≥ 0.7 (F = fraction of melt remaining). However, FCA yields magmas richer in compatible elements and with higher Sr-isotopic ratios than AFC at a given value of F. Repeated cycles of FCA and AFC combined with magma mixing (FAM) may result in unusual geochemical trends, such as the evolution of a calc-alkaline basaltic parent to a tholeiitic daughter magma, or the evolution of low- and medium-K calc-alkaline basalts to high-K andesites, dacites, trachyandesites or trachydacites. Lavas erupted by the volcano Micro Profitis Ilias on Santorini, Hellenic arc, Greece, provide an example of magmas which evolved by combined fractionation, assimilation by FCA and mixing.</div>
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Geochemical effects of decoupled fractional crystallization and crustal assimilation

Geochemical effects of decoupled fractional crystallization and crustal assimilation

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri