التفاصيل البيبلوغرافية
| العنوان: |
Redox conditions, glacio-eustasy, and the status of the Cenomanian–Turonian Anoxic Event: new evidence from the Upper Cretaceous Chalk of England |
| المؤلفون: |
Jeans, Christopher V., Wray, David S., Williams, C. Terry, Bland, David J., Wood, Christopher J. |
| المصدر: |
Acta Geologica Polonica; Vol. 71 No. 2 (2021); 103-152 ; Acta Geologica Polonica; Tom 71 Nr 2 (2021); 103-152 |
| بيانات النشر: |
Faculty of Geology University of Warsaw |
| سنة النشر: |
2021 |
| المجموعة: |
Geological Quarterly |
| مصطلحات موضوعية: |
Cretaceous, Cenomanian–Turonian Anoxic Event, Eustatic lithocycles, Glacial associations, Redox conditions, Cerium anomalies, Carbon isotopes, NW Europe, Japan |
| الوصف: |
The nature of the Cenomanian–Turonian Oceanic Anoxic Event (CTOAE) and its δ13 C Excursion is considered in the light of (1) the stratigraphical framework in which the CTOAE developed in the European shelf seas, (2) conclusions that can be drawn from new detailed investigations of the Chalk succession at three locations in England, at Melton Ross and Flixton in the Northern Province where organic-rich ‘black bands’ are present, and at Dover in the Southern Province (part of the Anglo-Paris Basin) where they are absent, and (3) how these conclusion fit in with the present understanding of the CTOAE. The application of the cerium anomaly method (German and Elderfield 1990) at Dover, Melton Ross and Flixton has allowed the varying palaeoredox conditions in the Chalk Sea and its sediments to be related to the acid insoluble residues, organic carbon, δ18O (calcite), δ13C (calcite), δ13C (organic matter), Fe 2+ and Mn2+ (calcite), and P/TiO2 (acid insoluble residue). This has provided evidence that the initial stages of the δ13C Excursion in England were related to (1) a drop of sea level estimated at between 45 and 85 metres, (2) influxes of terrestrial silicate and organic detritus from adjacent continental sources and the reworking of exposed marine sediments, and (3) the presence of three cold water phases (named the Wood, Jefferies and Black) associated with the appearance of the cold-water pulse fauna during the Plenus Cold Event. Conditions in the water column and in the chalk sediment were different in the two areas. In the Northern Province, cerium-enriched waters and anoxic conditions were widespread; the δ13C pattern reflects the interplay between the development of anoxia in the water column and the preservation of terrestrial and marine organic matter in the black bands; here the CTOAE was short-lived (~0.25 Ma) lasting only the length of the Upper Cenomanian Metoicoceras geslinianum Zone. In the Southern Province, water conditions were oxic and the δ13C Excursion lasted to the top of the Lower Turonian ... |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| Relation: |
https://gq.pgi.gov.pl/agp/article/view/32975/pdf; https://gq.pgi.gov.pl/agp/article/view/32975 |
| الاتاحة: |
https://gq.pgi.gov.pl/agp/article/view/32975 |
| Rights: |
Copyright (c) 2021 Acta Geologica Polonica |
| رقم الانضمام: |
edsbas.52FE61E8 |
| قاعدة البيانات: |
BASE |