TY - JOUR

T1 - Facies architecture of a Late Jurassic carbonate ramp

T2 - The Korallenoolith of the Lower Saxony Basin

AU - Kästner, M.

AU - Schuelke, I.

AU - Winsemann, J.

N1 - Funding Information: Acknowledgments We would like to thank C. Helm, E. Mönnig, H. Klassen, B. Seyfang, U. Asprion, and J. Hornung for discussion. G. Röhling is thanked for help with the handheld gamma-ray. Constructive reviews by C. Betzler and A. Strasser are very much appreciated and helped to improve the manuscript. The Norddeutsche Naturstein GmbH is thanked for the very good cooperation. The study was financially supported by the Deutsche Forschungsgemeinschaft (DFG, SCHU 1214/6–1; 6–2).

PY - 2008/9

Y1 - 2008/9

N2 - The sedimentary succession of a Late Jurassic (Oxfordian to basal Kimmeridgian) carbonate ramp is described and interpreted. The study area is located in the central part of the Lower Saxony Basin in NW Germany, which forms part of the Central European Basin. Eight well-exposed and undeformed sections of the study area (Süntel area, Wesergebirge and eastern part of the Wiehengebirge) provide detailed information about lithofacies and lateral thickness variations. Biostratigraphically, the age of these sediments is poorly constrained. Twenty microfacies types are recognized that can be grouped into seven facies associations: (a) strongly bioturbated marlstones deposited near storm wave base (SWB), (b) foraminifera-rich wackestones, (c) wackestones and floatstones with biostromes and (d) bioclastic limestones deposited between SWB and fair-weather wave base (FWWB), (e) oolitic and iron-oolitic limestones and (f) siliciclastic sediments deposited above FWWB, and (g) lagoonal deposits. These facies associations characterize a storm dominated shallow mixed carbonate-siliciclastic ramp. Based on facies changes, quartz content, and gamma ray logs, the Korallenoolith Formation can be subdivided into a lower carbonate-dominated and an upper siliciclastic-dominated part, build up by different scales of small- to large-scale deepening- and shallowing-upward cycles. A preliminary correlation of measured outcrops of this formation is presented.

AB - The sedimentary succession of a Late Jurassic (Oxfordian to basal Kimmeridgian) carbonate ramp is described and interpreted. The study area is located in the central part of the Lower Saxony Basin in NW Germany, which forms part of the Central European Basin. Eight well-exposed and undeformed sections of the study area (Süntel area, Wesergebirge and eastern part of the Wiehengebirge) provide detailed information about lithofacies and lateral thickness variations. Biostratigraphically, the age of these sediments is poorly constrained. Twenty microfacies types are recognized that can be grouped into seven facies associations: (a) strongly bioturbated marlstones deposited near storm wave base (SWB), (b) foraminifera-rich wackestones, (c) wackestones and floatstones with biostromes and (d) bioclastic limestones deposited between SWB and fair-weather wave base (FWWB), (e) oolitic and iron-oolitic limestones and (f) siliciclastic sediments deposited above FWWB, and (g) lagoonal deposits. These facies associations characterize a storm dominated shallow mixed carbonate-siliciclastic ramp. Based on facies changes, quartz content, and gamma ray logs, the Korallenoolith Formation can be subdivided into a lower carbonate-dominated and an upper siliciclastic-dominated part, build up by different scales of small- to large-scale deepening- and shallowing-upward cycles. A preliminary correlation of measured outcrops of this formation is presented.

KW - Depositional environment

KW - Facies analysis

KW - Gamma-ray

KW - Lower Saxony Basin

KW - Oxfordian

UR - http://www.scopus.com/inward/record.url?scp=50549084368&partnerID=8YFLogxK

U2 - 10.1007/s00531-007-0282-z

DO - 10.1007/s00531-007-0282-z

M3 - Article

AN - SCOPUS:50549084368

VL - 97

SP - 991

EP - 1011

JO - International Journal of Earth Sciences

JF - International Journal of Earth Sciences

SN - 1437-3254

IS - 5

ER -