Mineralogical and isotopic evidence for phenocryst-matrix disequilibrium in the Garner Mountain andesite

Mazzone, Peter; Grant, Norman K.

doi:10.1007/bf00371467

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…Plagioclase phenocrysts are assumed to record fractionation-assimilation events in different parts of the magma chamber. Early formed plagioclase phenocrysts crystallized under AFC conditions close to the roof of the chamber and were subsequently entrained in a liquid mixture composed of evolved interstitial liquid held in the partly crystallized roof zone and newly injected parental magma [35].…”

Section: Crustal Contamination and Afc Processesmentioning

confidence: 99%

Geochemistry and Petrogenesis of Oligocene Dacites From the Central Bosnia and Herzegovina With Insight in the Postcollisional Tectonic Evolution of Central Dinaridic Ophiolite Belt

Salkić¹,

Babajić²,

Lugović³

2021

AFST

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Magmatic rocks of post-Late Eocene magmatic formation are widespread in the Sava segment of Sava- Vardar suture zone and adjoin areas. The rocks formed as a response to transpressional-transtensional tectonic activity preceded by the Cretaceous-Eocene compression of the Internal Dinarides and Tisia Unit as fragments of Eurasian continental lithosphere. Central Bosnia Tertiary volcanic rocks (CBTVR), erupted as dacites in Lower Oligocene, are peculiar rocks of this formation either by their location (southernmost distal outcrops) or geological setting (extrusive within the melange of the Internal Dinaride Ophiolite Belt). Major element composition of the CBTVR reveals high-K calc-alkaline geochemical affinity whereas trace element discriminate the rocks as shoshonitic. The rocks are LILE-enriched and show negative Ta- Nb, P and Ti anomalies, and positive Pb anomalies typical of subduction related volcanic rocks. Chondrite-normalized REE patterns exhibit significant LREE/HREE enrichment [(La/Yb)cn = 21.4 - 33.4]. Geochemical affinity of the CBTVR combined with tectonic position of extrusions suggests derivation of the melts from the subcontinental mantle which had inherited strong orogenic signature during an ancient subduction.

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Section: Crustal Contamination and Afc Processesmentioning

confidence: 99%

Geochemistry and Petrogenesis of Oligocene Dacites From the Central Bosnia and Herzegovina With Insight in the Postcollisional Tectonic Evolution of Central Dinaridic Ophiolite Belt

Salkić¹,

Babajić²,

Lugović³

2021

AFST

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“…Some phenocrysts exhibit sericitic replacement, secondary carbonatization (calcite and dolomite) and kaolinization (Figure 2c). Fresh and clear phenocrysts may show normal, reverse and oscillatory zoning patterns even in the same sample (Table 3; Figure 3c; Figure 4c) which witness for recurent physicochemical disequilibrium within the coexisting magma [25,26].…”

Section: Petrography and Mineral Chemistrymentioning

confidence: 99%

Petrography and Mineral Chemistry of Oligocene Shoshonitic Dacites From the Central Bosnia

Salkić¹,

Lugović²,

Babajić³

2020

AFST

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Postorogenic volcanic rocks of different Tertiary ages are very common in the Sava-Vardar Zone of the Dinarides and in the southeastern part of adjoing Pannonian Basin. South of the Sava-Vardar Zone, in central Bosnia, Tertiary volcanic rocks occur within ophiolite sequences and genetically related sedimentary formations of the Dinaride Ophiolite Zone. Central Bosnia volcanic rocks are mostly dacites, and highly subordinately andesites as the members of the high-K calc-alkaline series.It appears from the mineralogical and petrographic characteristics obtained some insight into the processes that occurred during the genesis of the rocks. The presence of primary igneous minerals: clinopyroxene, orthopyroxene, hornblende and biotite from ferromagnesian minerals, and plagioclase, sanidine and quartz, indicates that the fractional crystallization played a significant role in the genesis of the rocks. Reaction edge on many rounded quartz phenocrysts indicates the possibility of magma mixing with the formation of Tertiary volcanic rocks of the central Bosnia. On magma mixing different temperature and chemical composition also indicates the existence of zoned plagioclase and amphibole phenocrysts.Complex compositional and zoning patterns of biotite and plagioclase phenocrysts and disequilibrium microstructures of plagioclase and quartz phenocrysts suggest interaction of fractionating, mantle derived melts with continental crust during a shalow level pre-eruptive stage and mixing with small amount of devolatilized phlogopite-phyric mafic magma before eruption.

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Mechanisms and rates of quartz dissolution in melts in the CMAS (CaO?MgO?Al2O3?SiO2) system

Shaw

2004

Contrib Mineral Petrol

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Mineralogical and isotopic evidence for phenocryst-matrix disequilibrium in the Garner Mountain andesite

Cited by 6 publications

References 21 publications

Geochemistry and Petrogenesis of Oligocene Dacites From the Central Bosnia and Herzegovina With Insight in the Postcollisional Tectonic Evolution of Central Dinaridic Ophiolite Belt

Geochemistry and Petrogenesis of Oligocene Dacites From the Central Bosnia and Herzegovina With Insight in the Postcollisional Tectonic Evolution of Central Dinaridic Ophiolite Belt

Petrography and Mineral Chemistry of Oligocene Shoshonitic Dacites From the Central Bosnia

Mechanisms and rates of quartz dissolution in melts in the CMAS (CaO?MgO?Al2O3?SiO2) system

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