Thermobarometry of mafic igneous rocks based on clinopyroxene-liquid equilibria, 0-30 kbar

Putirka, Keith; Johnson, M. C.; Kinzler, Rosamond J.; Longhi, J.; Walker, David

doi:10.1007/s004100050145

Cited by 437 publications

(377 citation statements)

References 33 publications

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“…Clinopyroxene components were calculated using procedures reported in Putirka et al (1996) and modified in Putirka (1999); see Supplementary 1 Data Table 1S for further details.…”

Section: Component Calculation Calibration Data Set and Regression mentioning

confidence: 99%

An improved clinopyroxene-based hygrometer for Etnean magmas and implications for eruption triggering mechanisms

Perinelli

Mollo

Gaeta

et al. 2016

American Mineralogist

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We have refined the clinopyroxene-based hygrometer published by Armienti et al. (2013) for a better quantitative understanding of the role of H 2 O in the differentiation of Etnean magmas. The original calibration data set has been significantly improved by including several experimental clinopyroxene compositions that closely reproduce those found in natural Etnean products. To verify the accuracy of the model, some randomly selected experimental clinopyroxene compositions external to the calibration data set have been used as test data. Through a statistic algorithm based on the Mallows' C P criterion, we also check that all model parameters do not cause data overfitting, or systematic error.The application of the refined hygrometer to the Mt. Etna 2011-2013 lava fountains indicates that most of the decreases in H 2 O content occur at P < 100 MPa, in agreement with melt inclusion data suggesting abundant H 2 O degassing at shallow crustal levels during magma ascent in the conduit and eruption to the surface.

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“…Clinopyroxene components were calculated using procedures reported in Putirka et al (1996) and modified in Putirka (1999); see Supplementary 1 Data Table 1S for further details.…”

Section: Component Calculation Calibration Data Set and Regression mentioning

confidence: 99%

An improved clinopyroxene-based hygrometer for Etnean magmas and implications for eruption triggering mechanisms

Perinelli

Mollo

Gaeta

et al. 2016

American Mineralogist

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“…The crystallization pressure for the cumulate and ankaramites was estimated with the clinopyroxene-liquid geobarometer of Putirka et al (1996Putirka et al ( , 2003. For sample SG12 clinopyroxene, and the bulk composition of olivine-and clinopyroxene-hosted melt inclusions were used.…”

Section: Temperature and Oxygen Fugacitymentioning

confidence: 99%

High-K ankaramitic melt inclusions and lavas in the Upper Cretaceous Eastern Srednogorie continental arc, Bulgaria: Implications for the genesis of arc shoshonites

Marchev

Georgiev

Zajacz

et al. 2009

Lithos

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The Upper Cretaceous Yambol-Burgas region of the Eastern Srednogorie continental arc is characterized by unusually large volumes of mafic shoshonitic and ultra-K magmatism represented by high-Mg cumulitic rocks, and nepheline-normative ankaramites, absarokites and shoshonitic (high-alumina) basalts. The cumulitic rocks consist of phenocrysts of clinopyroxene and olivine ) with inclusions of spinel (Cr#75-78). Olivine high-Fo cores and clinopyroxene host glassy melt inclusions which have nephelinenormative compositions with ankaramitic CaO/Al 2 O 3 ratios (N 1), low SiO 2 (47.4-50.0 wt.%), high MgO (7.5-10.8 wt.%), high total alkalis and shoshonitic K 2 O/Na 2 O ratios (N1). Electron microprobe and LA-ICPMS analyses demonstrate that parental magma was a high-Ca primitive mantle melt. Melt inclusions from the less Fo 85 rim approach absarokite composition with CaO/Al 2 O 3 ratios b 1, lower MgO (5.2 wt.%), and higher total alkalis and K 2 O/Na 2 O ratio. The ankaramitic rocks are strongly porphyritic, composed of phenocrysts of altered olivine with spinel inclusions and large clinopyroxene. Their major and trace element compositions are similar to those of melt inclusions hosted in the high-Fo 91-90 cores and clinopyroxene of the cumulitic rock. The absarokites differ from the high-K ankaramites by slightly higher SiO 2 (50.6-52.7 wt.%), Al 2 O 3 and alkali-oxide contents, lower FeO and MgO and particularly low CaO/Al 2 O 3 (0.6-0.9) ratio. Compared to the absarokites, shoshonitic basalts have similar SiO 2 (50.2-52.8 wt.%) at lower MgO contents and CaO/Al 2 O 3 ratios (0.37-0.53). The presented extensive set of major and trace element data on melt inclusions and whole rocks, along with their main phenocryst compositions, is used to constrain the crystallization temperatures and pressures of the most primitive ankaramites. We suggest that ankaramite compositions are formed by melting of a garnet-free metasomatized mantle source rather than by melting of lower crustal cumulates. Numerical modelling demonstrates that the generation of absarokites and shoshonitic basalts is compatible with fractionation of olivine and clinopyroxene from ankaramitic magma. The high-Mg chemistry of cumulitic rocks is explained as the result of accumulation of these minerals.

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“…The temperature, pressure and crystallisation depth of volcanic rocks can be estimated on the basis of clinopyroxene composition (Nimis, 1995;Nimis & Taylor, 2000;Nimis & Ulmer, 1998) and clinopyroxene-liquid equilibria (Putirka, 2008;Putirka, Johnson, Kinzler, & Longhi, 1996;Putirka, Mikaelian, & Ryerson, 2003). Putirka (2008) re-evaluated many quantitative temperature and pressure estimates on clinopyroxene composition and obtained an equilibrium constant using Fe-Mg for the high-K calc-alkaline volcanic rocks.…”

Section: Clinopyroxene Thermobarometrymentioning

confidence: 99%

Subduction-related Late Cretaceous high-K volcanism in the Central Pontides orogenic belt: constraints on geodynamic implications

Aydınçakır

2016

Geodinamica Acta

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Mineral chemistry, major and trace elements, 40 Ar/ 39 Ar age and Sr-Nd-Pb isotopic data are presented for the Late Cretaceous Hamsilos volcanic rocks in the Central Pontides, Turkey. The Hamsilos volcanic rocks mainly consist of basalt, andesite and associated pyroclastics (volcanic breccia, vitric tuff and crystal tuff). They display shoshonitic and high-K calc-alkaline affinities. The shoshonitic rocks contain plagioclase, clinopyroxene, alkali feldspar, phlogopite, analcime, sanidine, olivine, apatite and titanomagnetite, whereas the high-K calc-alkaline rocks contain plagioclase, clinopyroxene, orthopyroxene, magnetite / titanomagnetite in microgranular porphyritic, hyalo-microlitic porphyritic and glomeroporphyritic matrix. Mineral chemistry data reveal that the pressure condition of the clinopyroxene crystallisation for the shoshonitic rocks are between 1.4 and 6.3 kbar corresponds to 6-18-km depth and the high-K calc-alkaline rocks are between 5 and 12 km. 40 Ar/ 39 Ar age data changing between 72 ± .5 Ma and 79.0 ± .3 Ma (Campanian) were determined for the Late Cretaceous Hamsilos volcanic rocks, contemporaneous with the subduction of the Neo-Tethyan Ocean beneath the Pontides. The studied volcanic rocks were enriched in the large-ion lithophile and light rare earth element contents, with pronounced depletion in the contents of high-field-strength elements. Chondrite-normalised rare earth element patterns (La N /Lu N = 6-17) show low to medium enrichment, indicating similar sources of the rock suite. Pb/ 204 Pb values between 37.839 and 38.427. The main solidification processes involved in the evolution of the volcanic rocks consist of fractional crystallisation, with minor amounts of crustal contamination ± magma mixing. According to geochemical evidence, the shoshonitic melts in the Hamsilos volcanic rocks were possibly derived from the low degree of partial melting of a subcontinental lithospheric mantle (SCLM), while the high-K calc-alkaline melts were derived from relatively high degree of partial melting of SCLM that was enriched by fluids and/or sediments from a subduction of oceanic crust.

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Thermobarometry of mafic igneous rocks based on clinopyroxene-liquid equilibria, 0-30 kbar

Cited by 437 publications

References 33 publications

An improved clinopyroxene-based hygrometer for Etnean magmas and implications for eruption triggering mechanisms

An improved clinopyroxene-based hygrometer for Etnean magmas and implications for eruption triggering mechanisms

High-K ankaramitic melt inclusions and lavas in the Upper Cretaceous Eastern Srednogorie continental arc, Bulgaria: Implications for the genesis of arc shoshonites

Subduction-related Late Cretaceous high-K volcanism in the Central Pontides orogenic belt: constraints on geodynamic implications

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