NDLI: Transgressive–regressive sequence stratigraphy of Pennsylvanian Donezella bioherms in a foreland basin (Lena Group, Cantabrian Zone, NW Spain)

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Transgressive–regressive sequence stratigraphy of Pennsylvanian Donezella bioherms in a foreland basin (Lena Group, Cantabrian Zone, NW Spain)

Content Provider	Springer Nature Link
Author	Corrocha, Diego Barba, Pedro Colmenero, Juan R.
Copyright Year	2011
Abstract	A well-preserved Pennsylvanian (early Moscovian) succession including Donezella mounds, which accumulated in a highly subsiding foreland basin (Cantabrian Zone, NW of Spain), is described and discussed. This succession has been interpreted as one 3rd-order sequence reaching a thickness up to 815 m and recording ~2.3-My duration. It consists of four 4th-order transgressive–regressive (T-R) sequences (105–350 m thick and ~0.6-My duration), each subdivided into several 5th-order (~70-ky duration) meter-scale cycles (23-m average thickness). Nearly all the Donezella mounds are present in the second and third 4th-order sequences defined (Levinco Formation). They are up to ~90 m in thickness and several hundreds of meters wide, showing lenticular to domal morphologies with steep slopes up to 35–40°. Bioherms are composed of micritic boundstones with heterogeneous microfabrics and a diverse biotic community, including the microproblematic Donezella, calcitornellid foraminifers, bryozoans, agglutinated worm tubes, crinoids, and calcareous algae (red Komia/Ungdarella, beresellids, dasycladaceans and phylloids). According to the biotic assemblage and sedimentological features, these Donezella-rich bioherms thrived in a relatively shallow and low-energy environment (below fair-weather wave-base), and resulted from the baffling and binding ability of Donezella and associated biota, and the in situ-precipitation of microbial micrite. The upward evolution of the succession mainly resulted from the interplay between high tectonic subsidence rates and high-frequency moderate-amplitude glacioeustatic sea-level changes. The mounds growth mainly occurred during the transgressive phase of the 3rd-order sequence (Vereian), whereas during the regressive phase (Kashirian), deltaic siliciclastics prograding westward gradually buried and prevented the buildup development.
Starting Page	457
Ending Page	476
Page Count	20
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	58
Issue Number	3
e-ISSN	16124820
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-12-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Donezella Carbonate buildups Sequence stratigraphy Pennsylvanian Cantabrian Zone Spain Ecology Biogeosciences Geochemistry Sedimentology Paleontology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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