Chlorine stable isotopes in carbonatites; evidence for isotopic heterogeneity in the mantle

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doi: 10.1016/S0009-2541(97)00021-1
Authors:Eggenkamp, H. G. M.; Koster van Groos, A. F.
Author Affiliations:Primary:
University of Reading, Postgraduate Research Institute for Sedimentology, Whiteknights, Reading, United Kingdom
Other:
University of Illinois at Chicago, Chicago, IL, United States
Volume Title:Chemical Geology
Source:Chemical Geology, 140(1-2), p.137-143. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1997
Note:In English. 29 refs.; illus., incl. 1 table
Summary:Eight carbonatite samples were analysed for δ37Cl and for δ18O and δ13C. The results show that unaltered carbonatites have δ37Cl ratios between -0.8 and +0.1 per mil. Because the whole mantle δ37Cl value is approximately +4.7 per mil, chlorine for carbonatite is anomalously light. Although it is possible that the source regions for carbonatites represent isotopic anomalous mantle and may reflect contamination by a crustal component, our preferred explanation is that the processes resulting in the accumulation of carbonatite magma cause fractionation of chlorine isotopes. Abstract Copyright (1997) Elsevier, B.V.
Subjects:C-13/C-12; Carbon; Carbonatites; Chlorine; Cl-37/Cl-35; Geochemistry; Halogens; Heterogeneity; Igneous rocks; Isotope ratios; Isotopes; Magmas; Mantle; O-18/O-16; Oxygen; Stable isotopes; Fractionation
Abstract Numbers:98M/2768
Record ID:1997058376
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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