Isotopically anomalous 196Hg and 202Hg in Antarctic achondrites
Abstract
Antarctic shergottite EETA 79001 and polymict eucrite ALHA 78132 contain Hg which is anomalous in the 196Hg or 202Hg isotope. The anomalous fractions were extracted at 130°C during stepwise heating of neutron irradiated samples. The 196/202Hg ratios differ by factors of 2-4 from the normal Hg ratio. This is an enormous effect. Approximately fifty other Hg fractions extracted at temperatures up to 1200°C from these and several other Antarctic basaltic achondrites and from the non-Antarctic fall, Shergotty, gave 196/202Hg ratios within 20% of normal.
- Publication:
-
Geophysical Research Letters
- Pub Date:
- November 1987
- DOI:
- 10.1029/GL014i011p01127
- Bibcode:
- 1987GeoRL..14.1127J
- Keywords:
-
- Achondrites;
- Antarctic Regions;
- Mercury Isotopes;
- Anomalies;
- Concentration (Composition);
- Neutron Activation Analysis;
- METEORITES;
- STONY METEORITES;
- ACHONDRITES;
- ISOTOPES;
- SAMPLES;
- METEORITE;
- ANOMALIES;
- MERCURY (ELEMENT);
- ANTARCTIC METEORITES;
- SHERGOTTITES;
- ORIGIN;
- EETA79001;
- EUCRITES;
- ALHA78132;
- EET METEORITES;
- ALH METEORITES;
- SOURCE;
- LABORATORY STUDIES;
- ISOTOPIC RATIOS;
- SHERGOTTY;
- ALH 84009;
- LEW 85300;
- EETA82600;
- ALH 84001;
- ALHA77256;
- PCA 82502;
- LEW METEORITES;
- PROCEDURE;
- PCA METEORITES;
- AUBRITES;
- HOWARDITES;
- DIOGENITES;
- CATALOG;
- COMPARISONS;
- Mineralogy;
- Petrology;
- and Rock Chemistry: Isotope composition;
- Planetology: Comets and Small Bodies: Composition;
- Planetology: Comets and Small Bodies: Origin and evolution;
- General or Miscellaneous: New fields (not classifiable under other headings)