Fallick, A. E., Giuliani, G., Rigaudier, T., Boyce, A. J. , Pham, V. L. and Pardieu, V. (2019) Remarkably uniform oxygen isotope systematics for co-existing pairs of gem-spinel and calcite in marble, with special reference to Vietnamese deposits. Comptes Rendus Geoscience, 351(1), pp. 27-36. (doi: 10.1016/j.crte.2018.11.008)
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Abstract
Oxygen isotope systematics for co-existing pairs of gem-spinel and calcite in marble from Vietnam and other worldwide deposits have been determined in order to characterize the O-isotope fractionation between calcite and spinel. In Vietnam, the Δ18Occ–sp (= 3.7 ± 0.1‰ for six samples from the An Phu and Cong Troi deposits) is remarkably constant. The combination of these data with those obtained on calcite–spinel pairs of Paigutan (Nepal, n = 2), Ipanko (Tanzania, n = 1), and Mogok (Myanmar, = 2) are also consistent with an overall Δ18Occ–sp of 3.6 ± 0.3‰ for all the spinel samples (n = 11). The straight line correlation δ18Occ = 0.96 δ18Osp + 4.4 is excellent despite their worldwide geographic spread. The increment method of calculating oxygen isotope fractionation gave a geologically unreasonable temperature of formation for both minerals at 1374 °C when compared to temperatures obtained by mineral assemblage equilibrium of these marble type deposits, between 610 and 750 °C. The constant Δ18Occ–sp reflects a constant temperature for this amphibolite facies assemblage, whose current best estimate is calculated at 620 ± 40 °C, but unquantified uncertainties remain.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Boyce, Professor Adrian and Fallick, Professor Anthony |
| Authors: | Fallick, A. E., Giuliani, G., Rigaudier, T., Boyce, A. J., Pham, V. L., and Pardieu, V. |
| College/School: | College of Science and Engineering > Scottish Universities Environmental Research Centre |
| Journal Name: | Comptes Rendus Geoscience |
| Publisher: | Elsevier |
| ISSN: | 1631-0713 |
| ISSN (Online): | 1778-7025 |
| Published Online: | 23 January 2019 |
| Copyright Holders: | Copyright © 2018 Published by Elsevier Masson SAS on behalf of Acade´mie des sciences |
| First Published: | First published in Comptes Rendus Geoscience 351(1):27-36 |
| Publisher Policy: | Reproduced under a Creative Commons license |
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