Ion microprobe analysis of oxygen isotope ratios in quartz from Skye granite: healed micro-cracks, fluid flow, and hydrothermal exchange View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-08

AUTHORS

J. W. Valley, Colin M. Graham

ABSTRACT

Quartz grains in hydrothermally altered granites from the Isle of Skye are highly heterogeneous and not equilibrated in oxygen isotope ratio at the 20 μm scale. Ion microprobe analysis of one grain shows a gradient of 13‰ over 400 μm and a greater range in δ18O than all quartz previously analyzed on the Isle of Skye. Other crystals from the same outcrop are homogeneous. Digitized cathodoluminescence images reveal patterns of magmatic zoning and brittle fracturing not otherwise detectable. The ion probe analysis correlates low δ18O values on a micro-scale to one set of healed cracks. Thus, quartz exchanges oxygen isotopes primarily by solution and reprecipitation along fractures, in contrast to more reactive feldspar that appears to exchange from the grain boundary inward. Macroscopic models of isotope exchange are not realistic for these rocks; the flow of hydrothermal fluids was heterogeneous, anisotropic and crack controlled. More... »

PAGES

225-234

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s004100050188

DOI

http://dx.doi.org/10.1007/s004100050188

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1003104532


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