Clay minerals as records of temperature conditions and duration of thermal anomalies in the Paris Basin, France: discussion
| Autor: | Richard H. Worden, C. Spötl, F. Walgenwitz |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Geochemistry
Mineralogy 020101 civil engineering 02 engineering and technology Authigenic engineering.material 010502 geochemistry & geophysics 01 natural sciences Isotopes of oxygen 0201 civil engineering Diagenesis Petrography Geochemistry and Petrology Clastic rock Illite engineering Sedimentary rock Fluid inclusions Geology 0105 earth and related environmental sciences |
| Zdroj: | Clay Minerals. 31:203-208 |
| ISSN: | 1471-8030 0009-8558 |
| DOI: | 10.1180/claymin.1996.031.2.05 |
| Popis: | A highly illitic phase containing et al. (1992) and, more recently, by Clauer et al. (1995) from Upper Triassic sandstones of the Paris Basin (France). This phase is present in all size-fractions of all samples and was interpreted as authigenic. The K/Ar model ages of this illite range from 189–200 Ma and, combined with oxygen isotope data, were cited as evidence of high-temperature (220–250°C hydrothermal precipitation from highly 18O-enriched fluids at burial depths of only 500 m.We suggest that this type of illite is more likely to be diagenetically altered detrital illitic material and unlike authigenic illite-smectite which is also present in many of their samples. This reassessment of their petrographic observations leads to a much more realistic diagenetic interpretation consistent with previous studies of the basin and avoids the need to invoke basin-wide hydrothermal activity during shallow burial. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|