Crystallization conditions and petrogenesis of the paleoproterozoic basement rocks in Bangladesh: An evaluation of biotite and coexisting amphibole mineral chemistry

Hossain, Ismail; Tsunogae, Toshiaki

doi:10.1007/s12583-014-0402-1

Cited by 8 publications

(4 citation statements)

References 29 publications

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“…Differences between calculated and experimentally measured temperatures were in the range of −26 °C to +65 °C (see supporting information Table S1). In addition, a large number of published biotite data collected from intermediate‐silicic intrusions worldwide (e.g., Helmy et al, ; Hossain & Tsunogae, ; Sarjoughian et al, ; Wang et al, ) were used to check the applicability of this geothermometer in igneous systems. In the same intrusion, calculated crystallization temperatures of biotites (magmatic Mg‐biotites) are 5 °C to 228 °C lower than crystallization temperatures of amphiboles (Mg‐amphibole and Tschermakites; supporting information Table S1), which match the magmatic crystallization sequence determined by petrographic observations of each intrusion.…”

Section: Methodsmentioning

confidence: 99%

Geo‐fO₂: Integrated Software for Analysis of Magmatic Oxygen Fugacity

Cheng

Yang

2019

Geochem Geophys Geosyst

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Oxygen fugacity (fO2) is a fundamental thermodynamic property governing redox potential in solid Earth systems. Analysis of magmatic fO2 aids our understanding of the valence state and solubility of multivalent elements during magma evolution. Specialized software, Geo‐fO2, was developed for calculating magmatic fO2 on the basis of oxybarometers and thermobarometers for common minerals (amphibole, zircon, and biotite) in intermediate‐silicic magmas. With user‐friendly interfaces, it is easy to input files (.csv or Excel files), output data in Excel files, and plot results as binary diagrams that can be saved as vector graphics and modified using image‐processing software.

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Section: Methodsmentioning

confidence: 99%

Geo‐fO₂: Integrated Software for Analysis of Magmatic Oxygen Fugacity

Cheng

Yang

2019

Geochem Geophys Geosyst

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“…The physical and chemical conditions to which a magma is exposed determine the coexisting mineral phases in the rocks as a result of the conditions faced during its formation and emplacement (Abbott & Clarke, 1979). Given this aspect, in the petrologic study of granitoids, it is necessary to investigate the mineral phases, determining their chemical and physical characteristics, as well as pressure and temperature parameters, which can be inferred through the study of mineral chemistry (Hammarstrom & Zen, 1986; Hossain & Tsunogae, 2014; Vilalva & Vlach, 2014).…”

Section: Introductionmentioning

confidence: 99%

Contribution to the understanding of the Pinheiro Machado Complex (Dom Feliciano Belt, Brazil): A study of textures, mineral chemistry, and crystallization conditions

et al. 2020

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This article presents textures, mineral chemistry, and geothermobarometric data for the southeastern Pinheiro Machado Complex rocks (PMC), eastern domain of the Dom Feliciano Belt, Rio Grande do Sul, Brazil. The PMC is composed by comagmatic intrusions of quartz diorite, tonalite, and granodiorite with medium‐ to fine‐grained equigranular and medium‐grained inequigranular textures with subordinate alkali‐feldspar macrocrystals. Partial melting features are observed in the comagmatic as melt pools and melt films. Amphibolite xenoliths also occur, presenting sharp‐angled to rounded contacts with the intrusions and evidences of partial assimilation, marked by mafic schlierens. Electron probe microanalyzer punctual analyses were used to classify amphibole, plagioclase, biotite, epidote, and titanite, as well as for the calculations of the crystallization P–T conditions. Amphiboles consist of pargasite for the comagmatic intrusions, and Mg‐hornblende for the amphibolite. Plagioclase ranges from oligoclase to andesine (An15‐40) in both units. Biotite corresponds to annite, with Fe/(Fe + Mg) > 0.3. The epidote has mostly magmatic characteristics in the comagmatic intrusions, with pistacite content 25–30%. Titanite has two distinct textures, titanite I is well formed, subhedral to euhedral, with up to 3 mm; while titanite II is anhedral with size >1 mm and rounded shapes, being both chemically homogeneous. The estimated P–T conditions for the amphibolite crystallization, using plagioclase‐hornblende geothermometer are 650–850°C and 3.62–4.95 kbar, whereas the conditions from the comagmatic intrusions are 714–871°C and 4.44–6.10 kbar. In the mineral phases there is a prevalence in the recrystallization field between subgrain rotation (SGR) and grain boundary migration (GBM) in submagmatic flow. These new data indicate that possibly at the end of PMC crystallization, late magmatic fluids caused re‐equilibrium of mineral phases, mainly in biotite and feldspars. Finally, we suggest that the PMC is the result of continuous and repeated comagmatic intrusions in a continental magmatic arc setting at a depth of 20–30 km in an amphibolitic continental crust.

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“…Biotite and amphibole are particularly good sensors for the oxidation state of the magma from which they crystallized (Ridolfi et al 2010, Fegley 2013, Hossain and Tsunogae 2014 because their chemical compositions can reflect oxidation conditions during magma crystallization. In other words, as fO 2 increases in magmatic systems, the Fe 3+ /Fe 2+ ratio in the melt increases, leaving progressively less Fe 2+ to compete with Mg 2+ for site occupancy in mafic minerals and thus increasing the Mg# in these minerals (Wones and Eugster 1965).…”

Section: Oxygen Fugacitymentioning

confidence: 99%

Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil

et al. 2022

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Orthopyroxene-bearing tonalites/trondhjemites with scarce quartz diorites comprise the Café enderbite that crops out in three Neoarchean plutons in the central portion of the Canaã dos Carajás domain, Carajás Province, northern Brazil. Intrinsic parameters based on the mineral chemistry of plagioclase, biotite, amphibole, and pyroxene constrain crystallization conditions to 1150-850°C and 750-600 MPa, moderate water content in the melt (4.8-5.6 wt.%) and relatively oxidizing conditions, between the fayalite-magnetite-quartz (FMQ) and nickelnickel oxide (NNO) + 1.7 buffers. Geochemical modeling indicates that the Café enderbite evolved via at least two fractional crystallization stages -quartz diorite to orthopyroxene tonalite and orthopyroxene tonalite to orthopyroxene trondhjemite -with high crystal content (45-60%, or even higher). This high crystal content during fractional crystallization was the key factor to the preservation of orthopyroxene in the magmatic system as it left only a relatively small proportion of melt to react with early-formed orthopyroxene.

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Crystallization conditions and petrogenesis of the paleoproterozoic basement rocks in Bangladesh: An evaluation of biotite and coexisting amphibole mineral chemistry

Cited by 8 publications

References 29 publications

Geo‐fO₂: Integrated Software for Analysis of Magmatic Oxygen Fugacity

Geo‐fO₂: Integrated Software for Analysis of Magmatic Oxygen Fugacity

Contribution to the understanding of the Pinheiro Machado Complex (Dom Feliciano Belt, Brazil): A study of textures, mineral chemistry, and crystallization conditions

Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil

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Crystallization conditions and petrogenesis of the paleoproterozoic basement rocks in Bangladesh: An evaluation of biotite and coexisting amphibole mineral chemistry

Cited by 8 publications

References 29 publications

Geo‐fO2: Integrated Software for Analysis of Magmatic Oxygen Fugacity

Geo‐fO2: Integrated Software for Analysis of Magmatic Oxygen Fugacity

Contribution to the understanding of the Pinheiro Machado Complex (Dom Feliciano Belt, Brazil): A study of textures, mineral chemistry, and crystallization conditions

Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil

Contact Info

Product

Resources

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Geo‐fO₂: Integrated Software for Analysis of Magmatic Oxygen Fugacity

Geo‐fO₂: Integrated Software for Analysis of Magmatic Oxygen Fugacity