Microsampling and Isotopic Analysis of Igneous Rocks: Implications for the Study of Magmatic Systems

Davidson, Jon P.; Morgan, D. J.; Charlier, B. L.; Harlou, Rikke; Hora, John M.

doi:10.1146/annurev.earth.35.031306.140211

Cited by 397 publications

(237 citation statements)

References 108 publications

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“…A bag of olivine beach sand from Rum, for example, gives a similar overall composition (R. Hunter, personal communication, 1995). This particular feature of magmas to carry a heterogeneous load of crystals is also not restricted to olivine-rich magmas as has been repeatedly shown down to the smallest scales by Davidson and co-workers (e.g., Davidson et al 2005aDavidson et al , b, 2007 who aptly refer to this as the 'Crystal Cargo. ' There are several aspects of the presence of these olivine crystals that are distinctive to understanding the building of Fig.…”

Section: Olivine Slurriesmentioning

confidence: 72%

On some fundamentals of igneous petrology

Marsh

2013

Contrib Mineral Petrol

134

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The age-old process of crystal fractionation leading to the diversity of the igneous rocks and Earth itself is an exceedingly well-understood chemical process in magmatism and physical chemistry. But the broader physical aspects of this and related processes have proven elusive on many fronts, especially in its relation to the spatial variations in rock composition, texture, and macroscopic features like layering. Magmatic systems, be they volcanic, dikes, sills, or plutons, are generally analyzed with a problem at hand and an end result in mind. The processes invoked to solve these problems, which are most often purely chemical, are often unique to each problem with few if any general principles emerging that are central to understanding the wider perspective of magmatic processes and problems. An attempt is made at the outset to provide a list of inviolate Magmatic First Principles that are relevant to analyzing most magmatic problems. These involve: initial conditions; critical crystallinity; solidification fronts; transport and emplacement fluxes; phenocrysts, xenocrysts, primocrysts; crystal size; layering and crystal sorting; thermal convection; magmatic processes are physical. Along with these principles, two reference magmatic systems are suggested where the initial conditions and outcome are unequivocal: the Sudbury impact melt sheet and the Hawaiian lava lakes. Sudbury formed in *5 min by superheated magma crystallized to a near uniform sequence, while the tiny lava lakes, formed of crystal-laden slurries, form a highly differentiated layered sequence. The major difference is in the initial conditions of formation, especially the nature of the input materials. The challenge is to construct and analyze magmatic systems (i.e., magma chambers, sills, dikes, and lavas) using these reference end members and the suggested principles. The Hawaiian 500,000 year volcanic record exhibits what can be expected as input materials, namely a highly varied output of magma of an overall composition reflecting the abundance of entrained olivine primocrysts. The provenance of these crystals is varied, and within any single sample, the population may be highly heterogeneous in composition from crystal to crystal, yet the overall pattern of chemical fractionation is exceedingly regular and well defined. If similar inputs go to form large intrusions, these systems will undoubtedly be dominated by crystal-rich slurries, which provide a vast set of physical processes promoting exotic layering and, at the same time, given the effects of annealing and continued crystal growth, a final chemical record adhering to all the time-honored effects of crystal fractionation. The long assumed initial condition of instantaneously emplaced crystal-free magmas cannot reasonably produce the observed rock records.

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Section: Olivine Slurriesmentioning

confidence: 72%

On some fundamentals of igneous petrology

Marsh

2013

Contrib Mineral Petrol

134

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“…Magma mingling and mafic enclaves ( Fig. 4E and F) have been observed during the fieldwork and the zoned phenocrysts (plagioclase, sanidine, allanite, amphibole) provide clear evidence for magma mixing within a deeper magma chamber (Browne et al, 2006;Davidson et al, 2007;Ruprecht and Woerner, 2007;Smith et al, 2009;Vernon et al, 1988). Three magmas with mingling structures are found in the Vrsnik intrusions ( Fig.…”

Section: Magma Evolutionmentioning

confidence: 81%

Geochronology, geochemistry and isotope tracing of the Oligocene magmatism of the Buchim–Damjan–Borov Dol ore district: Implications for timing, duration and source of the magmatism

Lehmann

Barcikowski

Quadt

et al. 2013

Lithos

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. show that the magmatic products were slightly contaminated by continental crust material, e.g., the Variscan/Cadomian basement. In the Late EoceneOligocene belt the magmatism between 29 and 35 Ma is dominated by crustal melting with an increase in the mantle contribution between 20 and 27 Ma. We suggest the following scenario for the magmatic history of the Buchim-Damjan-Borov Dol ore district: a slab rollback of an oceanic slab located further to the SW which led to extensional and compressional features in upper levels of the continental crust. In the middle to upper crust three consecutive crystallization stages occurred at variable depths as indicated by amphibole zonation. Mixing of newly formed crust with mantle-like affinities and continental crust material in variable degrees during the ascent of the magma can explain all geochemical characteristics. The magma crystallized as dykes or stocks near the Earth's surface (N 1 km) after its final emplacement and contemporaneous hydrothermal activity led to different mineralization styles depending on the lithology of the host rocks.

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“…They have a variable chemical composition and Mg# 0.70-0.90, respectively) and were considered to derive from a cumulus crystal mush reservoir formed during the previous activity . Hence, these crystals are grown in and recycled from closely related progenitor magmas and they can be called "antecrysts" according to Davidson et al (2007).…”

Section: Significance and Age Of The High Sr-isotope Crystal Zonesmentioning

confidence: 99%

Crystal recycling in the steady-state system of the active Stromboli volcano: a 2.5-ka story inferred from in situ Sr-isotope and trace element data

Francalanci

Avanzinelli

Nardini

et al. 2011

Contrib Mineral Petrol

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The nal publication is available at Springer via http://dx.doi.org/10.1007/s00410-011-0661-0Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. 3 Abstract In-situ

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Microsampling and Isotopic Analysis of Igneous Rocks: Implications for the Study of Magmatic Systems

Cited by 397 publications

References 108 publications

On some fundamentals of igneous petrology

On some fundamentals of igneous petrology

Geochronology, geochemistry and isotope tracing of the Oligocene magmatism of the Buchim–Damjan–Borov Dol ore district: Implications for timing, duration and source of the magmatism

Crystal recycling in the steady-state system of the active Stromboli volcano: a 2.5-ka story inferred from in situ Sr-isotope and trace element data

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