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Evolution of lacustrine diatomite carbonate cycles of Miocene age, southeastern Spain; petrology and isotope geochemistry

A. Bellanca, J. P. Calvo, P. Censi, E. Elizaga and R. Neri
Evolution of lacustrine diatomite carbonate cycles of Miocene age, southeastern Spain; petrology and isotope geochemistry
Journal of Sedimentary Petrology (January 1989) 59 (1): 45-52

Abstract

Continental formations of Miocene age outcropping in southeastern Spain include beds of diatomites (in economic quantities) irregularly alternating with carbonate beds. The minerology and isotope geochemistry of the alternating carbonates and diatomites indicate variable depositional conditions associated with an overall deepening of a lake. Anhedral dolomite associated with sulfate minerals characterizes the first depositional stage and has heavy oxygen- and light carbon-isotopic values which are consistent with a formation in a restricted environment with highly evaporated waters. Increasing dilution of the water is reflected in the presence of abundant aragonite near the base of the assemblage which passes to calcite near the top. The gradual upward decrease of both delta (super 18) O and delta (super 13) C in these minerals indicates a parallel decrease of the evaporation/inflow ratio within the depositional basin. Also, seasonal variations of composition and volume of the water affect both the formation and diagenesis of carbonate minerals.


ISSN: 0022-4472
Coden: JSEPAK
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 59
Serial Issue: 1
Title: Evolution of lacustrine diatomite carbonate cycles of Miocene age, southeastern Spain; petrology and isotope geochemistry
Affiliation: Univ. Palermo, Ist. Mineral., Petrogr. e Geochim., Palermo, Italy
Pages: 45-52
Published: 198901
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 36
Accession Number: 1989-024379
Categories: Isotope geochemistrySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sect., sketch maps
N38°30'00" - N38°34'60", W00°19'60" - W00°15'00"
Secondary Affiliation: Univ. Complutense Madrid, ESP, Spain
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1989
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