Local distribution of oxygen isotopes and fluid exchange during genesis of the corundum-bearing rocks of Khitostrov Island
- 作者: Krylov D.P.1, Glebovitsky V.A.1
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隶属关系:
- Institute of Precambrian Geology
- 期: 卷 473, 编号 2 (2017)
- 页面: 441-443
- 栏目: Geochemistry
- URL: https://ogarev-online.ru/1028-334X/article/view/189678
- DOI: https://doi.org/10.1134/S1028334X17040110
- ID: 189678
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详细
New data are presented on the distribution of oxygen isotopes and conditions of the local isotope equilibrium in high-Al rocks rocks of Khitostrov Island showing abnormally low δ18O values (below–25‰). The temperatures of isotope equilibrium are within 400–475°C. The minimum δ18O values have been registered in the in plagioclase, whereas the same phases in kyanite-bearing rocks lacking corundum demonstrate δ18O values usually 3–5‰ higher. The fluid δ18O value varies from–22 to–16‰ at 475 ± 15°C, from–18 to–23‰ at 425 ± 25°C, and from–17 to–22‰ at 380 ± 15°C. The results obtained do not require abnormal depletion of δ18O values owing to the infiltration of an external fluid under the Svecofennian transformations. The association of corundum-bearing rocks with the basic intrusions, the presence of zircon cores of older ages compared to these rocks, and the peculiarities of rock chemistry may be ascribed to the fact that lower crustal layers of ancient rocks depleted in δ18O before metamorphism were captured by basite melts.
作者简介
D. Krylov
Institute of Precambrian Geology
编辑信件的主要联系方式.
Email: dkrylov@dk1899.spb.edu
俄罗斯联邦, nab. Makarova 2, St. Petersburg, 199034
V. Glebovitsky
Institute of Precambrian Geology
Email: dkrylov@dk1899.spb.edu
俄罗斯联邦, nab. Makarova 2, St. Petersburg, 199034
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