Foraminiferal morphogroups in dysoxic shelf deposits from the Jurassic of Spitsbergen

Polar research

Francisco J. Rodríguez-Tovar¹  Matías Reolid²  Jenö Nagy³ 

[1] Departamento de Estratigrafía y Paleontología, Universidad de Granada, Avenida Fuentenueva, ES-18071 Granada, Spain;Departamento de Geología, Campus Las Lagunillas, Universidad de Jaén, ES-23071 Jaén, Spain;Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, NO-0316 Oslo, NorwayCorrespondence

关键词: Foraminifera;    Jurassic;    morphogroups;    microhabitats;    palaeoenvironments;    Spitsbergen;   

DOI  :  10.1111/j.1751-8369.2009.00112.x

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Analysis of benthic foraminiferal assemblages was performed in Bathonian to Kimmeridgian deposits through a section covering the lower half of the Agardhfjellet Formation in central Spitsbergen. The section consists mainly of organic-rich shales, which contain low-diversity agglutinated assemblages. In this foraminiferal succession five morphogroups were differentiated according to shell architecture (general shape, mode of coiling and number of chambers), integrated with the supposed microhabitat (epifaunal, shallow infaunal and deep infaunal) and feeding strategy (suspension-feeder, herbivore, bacterivore, etc.). The environmental evolution of the analysed section is interpreted by using the stratigraphic distribution of morphogroups, combined with species diversities and sedimentary data, in a sequence stratigraphic framework. The section comprises two depositional sequences, which demonstrate that species diversity and relative frequency of morphogroups are correlative with transgressive–regressive tr...

【 授权许可】

CC BY-NC