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Book Chapter

The Middle to Upper Miocene Carbonate Complex of Níjar, Almería Province, Southeastern Spain

By
Carol Mankiewicz
Carol Mankiewicz
Departments of Biology and Geology, Beloit College, 700 College Street, Beloit, WI 53511 USA
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Published:
January 01, 1996

Abstract:

Field and petrographic studies of middle? to upper Miocene carbonate rocks near the town of Níjar (Almería Province, southeastern Spain) document the effects of relative sea-level change on sedimentation and biotic composition. Erosion, prograding and down-stepping beds (producing down-lap surfaces), or alteration due to subaerial exposure signify relative sea-level fall. Onlapping geometries, extensive bioturbation, channeling, or crossbedding characterize periods of relative rise.

Geometries of and within seven depositional units, variation in grain size and fossil constituents, sedimentary structures, and slight variation in color help differentiate the carbonate rocks in the field. The seven recognizable depositional units can be grouped into three broad associations: pre-reef, reef, and post-reef. Reefs did not develop during deposition of the older half of the section at Níjar; reef complexes (fringing types) are evident only in the younger half of the section. Reef-slope sediments are well preserved and exposed, but erosion truncated part of the reef core. The coral Porites and associated micritic coatings (probably microbial) constructed the reef framework. A variety of mollusks, coralline algae, serpulid worms, and bryozoans lived in association with Porites. The green calcareous alga Halimeda and the coralline alga Mesophyllum seem to have colonized the reef slope.

Syndepositional alteration (micro- and macro-boring) and cementation, fabric-selective dissolution of predominantly aragonitic components, dolomitization, and calcite cementation modified original mineralogy, fabric, and porosity.

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Contents

SEPM Concepts in Sedimentology and Paleontology

Models for Carbonate Stratigraphy from Miocene Reef Complexes of Mediterranean Regions

Evan K. Franseen
Evan K. Franseen
Kansas Geological Survey, University of Kansas, Lawrence, Kansas
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Mateu Esteban
Mateu Esteban
Carbonates International Ltd, Esporles, Mallorca, Spain
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William C. Ward
William C. Ward
Department of Geology and Geophysics, University of New Orleans, Louisiana
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Jean-Marie Rouchy
Jean-Marie Rouchy
Laboratoire de Geologie, Museum National D'Histoire Naturelle, Paris, France
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SEPM Society for Sedimentary Geology
Volume
5
ISBN electronic:
9781565762282
Publication date:
January 01, 1996

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