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Geochemical evolution of Jurassic diorites from the Bristol Lake region, California, USA, and the role of assimilation

Identifieur interne : 000395 ( Main/Exploration ); précédent : 000394; suivant : 000396

Geochemical evolution of Jurassic diorites from the Bristol Lake region, California, USA, and the role of assimilation

Auteurs : Edward D. Young [États-Unis] ; Joseph L. Wooden [États-Unis] ; Yuch-Ning Shieh [États-Unis] ; Daniel Farber [États-Unis]

Source :

RBID : ISTEX:D807C29496250298CBDB603CFEA43978D11A830F

Descripteurs français

English descriptors

Abstract

Abstract: Late Jurassic dioritic plutons from the Bristol Lake region of the eastern Mojave Desert share several geochemical attributes with high-alumina basalts, continental hawaiite basalts, and high-K are andesites including: high K2O concentrations; high Al2O3 (16–19 weight %); elevated Zr/TiO2; LREE (light-rare-earth-element) enrichment (La/YbCN=6.3–13.3); and high Nb. Pearce element ratio analysis supported by petrographic relations demonstrates that P, Hf, and Zr were conserved during differentiation. Abundances of conserved elements suggest that dioritic plutons from neighboring ranges were derived from similar parental melts. In the most voluminous suite, correlated variations in elemental concentrations and (87Sr/86Sr)i indicate differentiation by fractional crystallization of hornblende and plagioclase combined with assimilation of a component characterized by abundant radiogenic Sr. Levenberg-Marquardt and Monte Carlo techniques were used to obtain optimal solutions to non-linear inverse models for fractional crystallization-assimilation processes. Results show that the assimilated material was chemically analogous to lower crustal mafic granulites and that the mass ratio of contaminant to parental magma was on the order of 0.1. Lack of enrichment in 18O with differentiation is consistent with the model results. Elemental concentrations and O, Sr, and Nd isotopic data point to a hydrous REE-enriched subcontinental lithospheric source similar to that which produced some Cenozoic continental hawaiites from the southern Cordillera. Isotopic compositions of associated granitoids suggest that partial melting of this subcontinental lithosphere may have been an important process in the development of the Late Jurassic plutonic arc of the eastern Mojave Desert.

Url:
DOI: 10.1007/BF00310883


Affiliations:


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Le document en format XML

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<term>Average compositions</term>
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<term>Basaltic</term>
<term>Basaltic diorites</term>
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<term>Bristol lake region</term>
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<term>Bull canyon</term>
<term>Coefficient</term>
<term>Complex numerators</term>
<term>Confidence level</term>
<term>Continental crust</term>
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<term>Contrib</term>
<term>Contrib mineral petrol</term>
<term>Cosmochim</term>
<term>Crust</term>
<term>Crustal</term>
<term>Crystallization</term>
<term>Depaolo</term>
<term>Diorite</term>
<term>Diorite samples</term>
<term>Diorite suite</term>
<term>Dioritic</term>
<term>Dioritic rocks</term>
<term>Earth planet</term>
<term>Eastern mojave desert</term>
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<term>Elemental concentrations</term>
<term>Fractional</term>
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<term>Fractionating</term>
<term>Fractionating assemblage</term>
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<term>Geochemical evolution</term>
<term>Geochim</term>
<term>Geochim cosmochim acta</term>
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<term>Granite mountains diorite</term>
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<term>Granitic plutons</term>
<term>Granulites</term>
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<term>Hornblende</term>
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<term>Igneous rocks</term>
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<term>Incompatible behavior</term>
<term>Initial mass</term>
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<term>Model equations</term>
<term>Modeling</term>
<term>Mojave</term>
<term>Mojave desert</term>
<term>Nicholls</term>
<term>Numerator</term>
<term>Optimal solutions</term>
<term>Parental magma</term>
<term>Pearce</term>
<term>Pearce element ratio analysis</term>
<term>Pearce element ratios</term>
<term>Petrol</term>
<term>Plagioclase</term>
<term>Pluton</term>
<term>Plutonic</term>
<term>Plutonic rocks</term>
<term>Primitive sample</term>
<term>Proterozoic</term>
<term>Quartz</term>
<term>Reference sample</term>
<term>Southeastern california</term>
<term>Southern california</term>
<term>Subcontinental</term>
<term>Subcontinental lithosphere</term>
<term>Subsolidus alteration</term>
<term>Weight fraction</term>
<term>Weight fractions</term>
<term>Zircon</term>
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<term>Acta</term>
<term>Average compositions</term>
<term>Average model</term>
<term>Basalt</term>
<term>Basaltic</term>
<term>Basaltic diorites</term>
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<term>Bristol lake diorites</term>
<term>Bristol lake region</term>
<term>Bristol mountains</term>
<term>Bulk distribution coefficient</term>
<term>Bull canyon</term>
<term>Coefficient</term>
<term>Complex numerators</term>
<term>Confidence level</term>
<term>Continental crust</term>
<term>Continental hawaiite basalts</term>
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<term>Plutonic</term>
<term>Plutonic rocks</term>
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<term>Quartz</term>
<term>Reference sample</term>
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<term>Southern california</term>
<term>Subcontinental</term>
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<div type="abstract" xml:lang="en">Abstract: Late Jurassic dioritic plutons from the Bristol Lake region of the eastern Mojave Desert share several geochemical attributes with high-alumina basalts, continental hawaiite basalts, and high-K are andesites including: high K2O concentrations; high Al2O3 (16–19 weight %); elevated Zr/TiO2; LREE (light-rare-earth-element) enrichment (La/YbCN=6.3–13.3); and high Nb. Pearce element ratio analysis supported by petrographic relations demonstrates that P, Hf, and Zr were conserved during differentiation. Abundances of conserved elements suggest that dioritic plutons from neighboring ranges were derived from similar parental melts. In the most voluminous suite, correlated variations in elemental concentrations and (87Sr/86Sr)i indicate differentiation by fractional crystallization of hornblende and plagioclase combined with assimilation of a component characterized by abundant radiogenic Sr. Levenberg-Marquardt and Monte Carlo techniques were used to obtain optimal solutions to non-linear inverse models for fractional crystallization-assimilation processes. Results show that the assimilated material was chemically analogous to lower crustal mafic granulites and that the mass ratio of contaminant to parental magma was on the order of 0.1. Lack of enrichment in 18O with differentiation is consistent with the model results. Elemental concentrations and O, Sr, and Nd isotopic data point to a hydrous REE-enriched subcontinental lithospheric source similar to that which produced some Cenozoic continental hawaiites from the southern Cordillera. Isotopic compositions of associated granitoids suggest that partial melting of this subcontinental lithosphere may have been an important process in the development of the Late Jurassic plutonic arc of the eastern Mojave Desert.</div>
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