Vein growth mechanisms and fluid sources revealed by oxygen isotope laser microprobe

D. L. Kirschner, Z. D. Sharp, Christian Teyssier

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

In situ, laser microprobe analyses of millimetre-wide quartz veins has revealed the largest δ 18 O gradients (9‰/mm) yet documented in terrestrial samples. The systematic isotopic variations indicate a crack-seal growth mechanism that variably interleaved 18 O-enriched quartzite porphyroclasts with newly precipitated, 18 O-depleted vein quartz. The isotopically light quartz requires open-system infiltration of meteoric fluids into the quartzite during its incorporation into the Ruby Gap duplex (central Australia). Documentation of the fluid source in these small veins would not be possible without submillimetre isotopic sampling capabilities. Application of this laser-based technology to other geological problems should result in similar documentation of large isotopic gradients and provide new insight into fluid-rock interactions. -Authors

Original languageEnglish (US)
Pages (from-to)85-88
Number of pages4
JournalGeology
Volume21
Issue number1
DOIs
StatePublished - Jan 1 1993

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