Microscale isotopic zoning in calcite and graphite crystals in marble

Saved in:
Online Access: Get full text
doi: 10.1038/331061a0
Authors:Wada, Hideki
Author Affiliations:Primary:
Shizuoka Univ., Inst. Geosci., Shizuoka, Japan
Volume Title:Nature (London)
Source:Nature (London), 331(6151), p.61-63. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836
Publication Date:1988
Note:In English. 19 refs.; illus.
Summary:C and O isotope data are presented for calcite and graphite crystals in marble from the Hida metamorphic belt, Japan. These show chemical and isotopic zoning. The 18O contents of a calcite crystal decrease by = or <7per mille within 200 mu m of the calcite-graphite boundary, while 13C also decreases from the calcite core outwards. Similar depletions occur at calcite-calcite boundaries. The 13C contents of graphites were mainly constant. The isotopic patterns are interpreted in terms of isotopic exchange with metamorphic fluids relatively depleted in 13C and 18O. Cores of crystals should be used for accurate geothermometry. [R.K.H.]
Subjects:C-13/C-12; Calcite; Carbon; Carbonates; Fluid phase; Geochemical indicators; Geochemistry; Geologic thermometry; Graphite; Isotopes; Marbles; Metamorphic rocks; Metamorphism; Minerals; Native elements; O-18/O-16; Oxygen; Phase equilibria; Polymetamorphism; Stable isotopes; Zoning; Asia; Far East; Hida metamorphic belt; Honshu; Japan
Abstract Numbers:88M/4063
Record ID:1988017874
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Tags: Add Tag
No Tags, Be the first to tag this record!

Similar Items