A comment on crystal shapes resulting from dissolution in magmas

Donaldson, Colin H.

doi:10.1180/minmag.1985.049.350.19

Cited by 34 publications

(14 citation statements)

References 19 publications

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“…Similar patterns have been observed in feldspars interpreted as resulting from juxtaposition of the grain with a melt with which it is not in equilibrium (cf. Donaldson, 1985;Pearce & Kolisnik, 1990). We hence interpet the growth history revealed by image 3 as resulting from two distinct periods of growth under differing magma conditions.…”

Section: Complex Zoning Patterns From Quartz Grains In Granitementioning

confidence: 92%

RAPID COMMUNICATIONS Complex quartz growth histories in granite revealed by scanning cathodoluminescence techniques

et al. 1997

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A scanning electron microscope based cathodoluminescence technique utilizing a novel collector system reveals complex internal heterogeneities within granitic quartz grains. The technique overcomes the low intensity and limited variation in cathodoluminescence generated by quartz, which hamper conventional cathodoluminescence analysis. Detailed images of zoning patterns in quartz are comparable to those observed in minerals such as feldspar, and attributed to a combination of progressive growth, boundary layer effects and mineral-melt disequilibria produced during fluctuations in melt composition and temperature during the crystallization interval. We attribute such mineral-melt disequilibria to open system, mixing behaviour in the granite plutons sampled.

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Section: Complex Zoning Patterns From Quartz Grains In Granitementioning

confidence: 92%

RAPID COMMUNICATIONS Complex quartz growth histories in granite revealed by scanning cathodoluminescence techniques

et al. 1997

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“…The normal (or pole) to a face on a growth form corresponds to a direction of slow growth. Despite statements to the contrary (Donaldson, 1985, quoting Bagdasarov et al, 1974, the same direction should also be one of slow etch; and if dissolution has proceeded far enough, a vertex may be expected. Thus (I) faces in growth become vertices in dissolution.…”

Section: On the Shapes Of Dissolved Crystalsmentioning

confidence: 98%

On the shapes of dissolved crystals

Moore

1986

Mineral. mag.

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“…A number of studies Donaldson 1985b;Zhang et al 1989), have observed that, in general, interface reaction is unimportant in determining the dissolution rates of silicate minerals in silicate melts. Interface reaction may only become important either during bulk magma flow-in which a crystal is in continual contact with the bulk melt-or where the melt is only slightly undersaturated with respect to the components of the dissolving crystal (Donaldson 1985a;Zhang et al 1989).…”

Section: Zircon Dissolution In Silicate Melts: Theoretical Consideratmentioning

confidence: 99%

The nature of zircon inheritance in two granite plutons

Paterson

Stephens²,

Rogers

et al. 1992

Geological Society of America Special Papers

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Using zircons taken from two granite plutons, Strontian (Caledonian, northwestern Scotland) and Kameruka (Bega Batholith, southeastern Australia), this study presents observations that have a bearing on refractory zircons as provenance indicators. Two broad textural types of refractory zircon were identified: (1) those which show simple two-stage growth histories; and (2) those which have apparently undergone repeated periods of growth, resorption, mechanical abrasion, fracturing and fracture-healing. SHRIMP U-Pb ages obtained from the Kameruka zircons indicate that the cores are the textural manifestation of inheritance. The shapes of refractory cores are not unambiguously indicative of their ultimate origin, since they may also be modified by processes that occur before and after incorporation into the magma. The cores within the two populations show a great diversity in types and styles of zoning, and in composition, implying that they have not chemically equilibrated internally, or externally with their host melt.

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A comment on crystal shapes resulting from dissolution in magmas

Cited by 34 publications

References 19 publications

RAPID COMMUNICATIONS Complex quartz growth histories in granite revealed by scanning cathodoluminescence techniques

RAPID COMMUNICATIONS Complex quartz growth histories in granite revealed by scanning cathodoluminescence techniques

On the shapes of dissolved crystals

The nature of zircon inheritance in two granite plutons

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