RECAMP—A FORTRAN IV program for estimating Fe3+ contents in amphiboles

Spear, Frank S.; Kimball, Karen L.

doi:10.1016/0098-3004(84)90029-3

Cited by 102 publications

(49 citation statements)

References 3 publications

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“…The structural formulae for amphibole were calculated by assuming total cations equal to 13 (except Ca, Na, and K; Leake 1978;Spear and Kimball 1984). The characteristic amphibole in the garnet amphibolite is calcic amphibole, classified in a broad sense as hornblende.…”

mentioning

confidence: 99%

Tectonic Evolution of the Careón Ophiolite (Northwest Spain): A Remnant of Oceanic Lithosphere in the Variscan Belt

García¹,

Arenas²,

Catalán³

et al. 1999

The Journal of Geology

103

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A B S T R A C TAnalysis of the Careó n Unit in the Ordenes Complex (northwest Iberian Massif) has supplied relevant data concerning the existence of a Paleozoic oceanic lithosphere, probably related to the Rheic realm, and the early subduction-related events that were obscured along much of the Variscan belt by subsequent collision tectonics. The ophiolite consists of serpentinized harzburgite and dunite in the lower section and a crustal section made up of coarse-grained and pegmatitic gabbros. An Early Devonian zircon age ( Ma, U-Pb) was obtained in a leucocratic gabbro. The 395 ‫ע‬ 2 whole section was intruded by numerous diabasic gabbro dikes. Convergence processes took place shortly afterward, giving rise to a mantle-rooted synthetic thrust system, with some coeval igneous activity. Garnet amphibolite, developed in metamorphic soles, was found discontinuously attached to the thrust fault. The soles graded downward to epidote-amphibolite facies metabasite and were partially retrogressed to greenschist facies conditions. Thermobarometric estimations carried out at a metamorphic sole ( ЊC; kbar) suggested that imbrications T ≈ 650 P ≈ 11.5 developed in a subduction setting, and regional geology places this subduction in the context of an early Variscan accretionary wedge. Subduction and imbrication of oceanic lithosphere was followed by underthrusting of the Gondwana continental margin.

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mentioning

confidence: 99%

Tectonic Evolution of the Careón Ophiolite (Northwest Spain): A Remnant of Oceanic Lithosphere in the Variscan Belt

García¹,

Arenas²,

Catalán³

et al. 1999

The Journal of Geology

103

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“…The aforementioned method is similar to but different to a certain extent from the methods employed by Spear and Kimball (1984) and Robinson et al (1982). On the basis of the calculated pressures presented in Table 4, the temperatures were calculated by the BH90, HB 1 94 and HB 2 94 geothermometers, and results are presented in Table 5.…”

Section: Geothermobarometry Of Amphibolesmentioning

confidence: 99%

“…Analytical data on plagioclases were calculated as atomic values of the elements based on eight atoms of oxygen and for intermediate to basic rocks are presented in Table 2. The Fe 2+ and Fe 3+ contents of the analyzed points in amphiboles were estimated by using the method described by Spear and Kimball (1984), and the structural formulas of the amphiboles were determined (Tables 1 and 3). The amphiboles were also classified and named using the structural formulas and the methods in IMA1997 (Leake et al, 1997) and IMA2004 (Leake et al, 2004).…”

Section: Samples and Methodsmentioning

confidence: 99%

“…Consequently, analyses are usually in terms of total iron, recorded as FeO. However, Fe 2+ and Fe 3+ occupy different types of cation sites in amphiboles, and the amount of Fe 3+ in an amphibole is critical in determining the A-site occupancy (Spear and Kimball, 1984). Therefore, the amounts of Fe 2+ and Fe 3+ were calculated by using a method employed in IMA to determine the structural formula of amphiboles.…”

Section: Chemistry Of Amphibolesmentioning

confidence: 99%

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Geothermobarometry of amphiboles in intermediate to basic rocks from the Almogholagh pluton in western Iran

Amiri

Khalaji

Tahmasbi

et al. 2016

Journal of Mineralogical and Petrological Sciences

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In this study, some barometries and thermometries were used to calculate the crystallization temperature and pressure of amphiboles in intermediate to basic rocks from the Almogholagh pluton in western Iran. Intersection among geothermometers was introduced as a method to estimate crystallization temperature, and the results obtained were compared with those of other methods. Results showed that obtaining the average pressure from the intersections between geothermometers and geobarometers is a suitable approach to determine the crystallization pressure of the analyzed points of amphiboles, whereas the crystallization temperature can be appropriately determined from the intersection among geothermometers. In addition, the average temperature of the HB 2 94 geothermometer is approximately equal to the average temperature in intersection among geothermometers. HB 2 94 is apparently a suitable geothermometer to determine the crystallization temperature in intermediate to basic rocks. In this study, the average crystallization temperature and pressure using intersection methods were 714-719°C and 6.5-7.5 kbar, respectively. Adopting these methods to the Almogholagh pluton, intermediate to basic rocks intruded at a depth of 24-28 km of the crust and at 674-759°C.

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“…8B -1). Recalculation of the ferrous and ferric irons in amphibole followed the methods of Holland and Blundy (1994) and Spear and Kimball (1983). Rim compositions exhibit more silicic compositions in the amphibole classification diagram (Leake et al, 1997), from ferro -edenite to ferropargasite (Fig.…”

Section: Temperature Conditions Of Exsolution Coarsening Reactionsmentioning

confidence: 99%

Three-dimensional cooling pattern of a granitic pluton I: The study of exsolution sub-solidus reactions in the Toki granite, Central Japan

Yuguchi

Tsuruta

Nishiyama

2011

Journal of Mineralogical and Petrological Sciences

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This paper presents the results of petrographical studies carried out to examine the development and variation of sub -solidus reactions occurring in the Toki granite, Central Japan. The results reveal the three -dimensional cooling pattern of this zoned pluton. Samples collected from 19 boreholes in the Toki granite indicate a spatial variation in the extent of sub -solidus reactions. Exsolution coarsening produced microperthite textures with albiterich lamellae in this pluton, whereas deuteric coarsening resulted in patchperthite with albite -rich patches. The width and spacing of the albite -rich lamella in microperthite increase systematically and prominently with elevation in the pluton. This indicates that the Toki granite effectively cooled from the roof during the exsolution coarsening stage. Measurements obtained using the hornblende -plagioclase and ternary feldspar thermometers indicate that volume diffusion took place in the temperature range 780 -690 °C; this diffusion was associated with exsolution coarsening.

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RECAMP—A FORTRAN IV program for estimating Fe3+ contents in amphiboles

Cited by 102 publications

References 3 publications

Tectonic Evolution of the Careón Ophiolite (Northwest Spain): A Remnant of Oceanic Lithosphere in the Variscan Belt

Tectonic Evolution of the Careón Ophiolite (Northwest Spain): A Remnant of Oceanic Lithosphere in the Variscan Belt

Geothermobarometry of amphiboles in intermediate to basic rocks from the Almogholagh pluton in western Iran

Three-dimensional cooling pattern of a granitic pluton I: The study of exsolution sub-solidus reactions in the Toki granite, Central Japan

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