Cretaceous-Tertiary Boundary Spherules and Cenozoic Microtektites: Similarities and Differences
Abstract
Bohor and Betterton pointed out that the K-T spherules can be divided into three groups. Their Type 1 spherules appear to be found in or adjacent to North America, particularly the Western Interior and in Haiti and Mexico. The Type 1 spherules occur in the lower part of the K-T boundary clay below an Ir anomaly. It is the Type 1 spherules which are most similar to microtektites. The discovery of K-T boundary spherules in Beloc, Haiti, and Mimbral, Mexico, with residual tektite-like glass cores supports the hypothesis that the Type 1 spherules are diagenetically altered microtektites. The similarities and differences of the Type 1 K-T boundary spherules to previously described Cenozoic microtektites are discussed.
- Publication:
-
Lunar and Planetary Science Conference
- Pub Date:
- March 1993
- Bibcode:
- 1993LPI....24..539G
- Keywords:
-
- Anomalies;
- Cretaceous-Tertiary Boundary;
- Iridium;
- Meteoritic Composition;
- Planetary Geology;
- Spherules;
- Tektites;
- Analogies;
- Clays;
- Glass;
- Haiti;
- Mexico;
- Astrophysics