A general mixing equation with applications to Icelandic basalts

Langmuir, C. H.; Vocke, Robert D.; Hanson, Gilbert N.; Hart, Stanley R.

doi:10.1016/0012-821x(78)90053-5

Cited by 913 publications

(344 citation statements)

References 19 publications

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“…This is further suggested by the strong anti-correlation between Hf and Fig. 7 Mixing models following Langmuir et al (1978) using one UTh-Y-rich zircon to represent the felsic end-member and three U-Th-Y-poor zircons to represent mafic end-members. a Despite some scatter at high values, note the U-Y mixing models provide a good fit to the data from the oscillatory-zoned zircon domains.…”

Section: Magma Mixing and Relationships With Other Accessory Phasesmentioning

confidence: 94%

“…Miller and Wooden 2004;Lowery Claiborne et al 2006), while low HREE and Y in zircon are a signature of growth in mafic, mantle-derived magmas (Belousova et al 1998;Hoskin and Ireland 2000). We conducted mixing calculations (Langmuir et al 1978) in order to test if the patchy-zoned zircon cores would follow simple mixing trends (Fig. 7).…”

Section: Magma Mixing and Relationships With Other Accessory Phasesmentioning

confidence: 99%

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Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Gagnevin

Daly

Kronz

2009

Contrib Mineral Petrol

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This study documents the chemical and textural responses of zircon in the Elba igneous complex, with particular reference to the 7-to 7.8-Ma-old Monte Capanne pluton in relation to its coeval volcanic counterpart (Capraia), using BSE imaging and quantitative electron microprobe analyses. The Monte Capanne pluton displays multiple field and geochemical evidence for magma mixing. The samples we have investigated (including monzogranitic, mafic enclave and dyke samples) display similar zircon textures and are associated with an extremely large range of trace and minor element (Hf, Y, HREE, Th, U) compositions, which contrast with relatively simple textures and zoning patterns in zircons from a Capraia dacite. We have used a relatively simple textural classification (patchy zoning, homogenous cores, oscillatory zoning and unzoned zircon) as the basis for discussing the chemical composition and chemical variation within zircons from the Monte Capanne pluton. Based on these data and other works in Lithos 78:101-118, 2004 , it is inferred that mixing between metaluminous and peraluminous melts occurred early in the evolution of the Monte Capanne magma chamber. In particular, mixing was responsible for the development of the patchy-zoning texture in the zircon cores, which was associated with reactions between other accessory phases (including monazite, apatite, allanite), which we infer to have significantly affected the Th distribution in zircon. Zircons from the MC pluton displaying ''homogeneous cores'' have chemical affinities with zircons in the coeval Capraia volcanic system, consistent with the participation of a Capraia-like mantle end-member during mixing. Further zircon growth in the MC pluton produced the oscillatory zoning texture, which records both long-term (crystal fractionation) and transient (recharge with both silicic and mafic magmas) events in a hybrid magma chamber. It is inferred that Hf and the Th/U ratio cannot be used alone to infer magmatic processes due to their dependency on temperature, nor are they a diagnostic feature of xenocrystic grains. This study shows that zircon chemistry coupled with detailed textural analysis can provide a powerful tool to elucidate the complex evolution of a magma system.

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Section: Magma Mixing and Relationships With Other Accessory Phasesmentioning

confidence: 94%

Section: Magma Mixing and Relationships With Other Accessory Phasesmentioning

confidence: 99%

Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Gagnevin

Daly

Kronz

2009

Contrib Mineral Petrol

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“…A property of the hyperbolic mixing curve is that twocomponent mixtures are linearly correlated on an inverse plot of 87Sr/86Sr vs. Ca/Sr. This allows the two-component mixing hypothesis to be tested graphically (Langmuir et al, 1978). If the endmembers to mixing are seawater and freshwater (which have very different Sr/Ca), the specific DOT, necessary to transform Sr/Ca+,, to SrlCa,,,, is fixed by the condition that seawater must plot on the mixing line.…”

Section: A Graphical Technique Using 87sr/%r and Sr/ca Ratiosmentioning

confidence: 99%

Paleosalinities in ancient brackish water systems determined by 87Sr/86Sr ratios in carbonate fossils: A case study from the Western Canada sedimentary basin

Holmden

Creaser

Muehlenbachs

1997

Geochimica et Cosmochimica Acta

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“…It is commonly accepted that if mixing is the only process occurring in the system, linear correlations between the concentrations of any two elements should result. The process has been simulated using a linear equation combining the composition of the two end-member magmas, that of the hybrid, and the progress of the mixing process (Fourcade and Allegre 1981;Langmuir et al 1978)-an equation that has been used in many publications.…”

Section: Introductionmentioning

confidence: 99%

Chaotic three-dimensional distribution of Ba, Rb, and Sr in feldspar megacrysts grown in an open magmatic system

Słaby

Śmigielski

Śmigielski³

et al. 2011

Contrib Mineral Petrol

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As has been demonstrated in recent years, the heterogeneities of coeval magmas can be more successfully revealed by zoned megacrysts rather than by analysis of the whole rocks hosting them. Here, the geochemical heterogeneities of feldspar megacrysts from the Karkonosze granite, Poland, are investigated by LA-ICP-MS. The crystals are the product of migration and growth in regions of poorly mixed magmas. 3D-modeling of the Ba, Sr, and Rb distributions emphasizes the importance of micro-domain growth morphologies. Two models of element behavior-a relative concentration model and a composition gradient model-provide a potentially effective tool for tracking the mixing process on a microscale. Measured concentrations of elements of different mobilities do not agree with what might be expected from the mixing of two end-member magmas. If mixing was the only process occurring, linear correlations between the concentrations of any two elements should be observed; this, however, is not the case. For combinations of any two of the three elements, modeling reveals differing non-linear correlations between concentrations. The megacryst heterogeneities provide an insight into how mixing magmas are chaotically advected to growing crystals and the degree of inter-magma element exchange between the magmas.

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A general mixing equation with applications to Icelandic basalts

Cited by 913 publications

References 19 publications

Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Paleosalinities in ancient brackish water systems determined by 87Sr/86Sr ratios in carbonate fossils: A case study from the Western Canada sedimentary basin

Chaotic three-dimensional distribution of Ba, Rb, and Sr in feldspar megacrysts grown in an open magmatic system

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