Carbon and oxygen isotopes: a tool for Jurassic and early Cretaceous pelagic correlation (southern Spain)
✍ Scribed by J. Rey; A. Delgado
- Book ID
- 102222413
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 424 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0072-1050
- DOI
- 10.1002/gj.919
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✦ Synopsis
Abstract
The isotopic evolution of δ^13^C and δ^18^O is reported for the Jurassic and early Cretaceous in two pelagic sections of the External Zones in the Betic Cordilleras (SE Spain). Stable isotope curves from pelagic trough and swell sections display similar patterns. Variations in δ^18^O and δ^13^C values from strata at equivalent age probably reflect both early diagenetic cementation and later temperature‐related burial diagenesis.
Comparison of global isotope curves with those presented in this work allows the differentiation of global from local events. Thus, the anoxic event during the early Toarcian (falciferum Zone) is characterized by elevated δ^13^C and depressed δ^18^O values. The isotopic record also allows the detection of the middle Oxfordian transgression. There are other peaks for the late Toarcian, early Bajocian, Callovian and early Berriasian that can also be used as tools for correlation purposes. Copyright © 2002 John Wiley & Sons, Ltd.