Autor: Miriam A. Bertram, James P. Cowen
Rok vydání: 1998
Předmět:
Zdroj: Aquatic Geochemistry. 4:455-468
ISSN: 1380-6165
DOI: 10.1023/a:1009648701741
Popis: The walls of many deep-sea foraminiferal tests contain abiogenic and biogenic, precip- itated and agglutinated, components. Both environmental and genetic factors can contribute to the great diversity in test form and composition in benthic foraminifera. Yet, small specimen size and the remoteness of the deep-sea environment have limited our ability to describe the relative influence of these biological and chemical factors. The use of fossilized foraminiferal tests as paleo-indicators requires that we understand the controls on test composition. Test wall morphology and composition were examined in foraminifera that colonized experimental substrates deployed on a seamount in the central North Pacific. Three types of agglutinated forms were identified. A triserial (Eggerella- like) and two-chambered (Hyperammina-like) form contained a Ca-rich (CaCO3) precipitate and the chamber walls of an encrusting two-chambered form was Ba-rich (BaSO4). We discuss the composi- tion of these biologically precipitated minerals in the context of the environmental conditions during the life of these foraminifera.
Databáze: OpenAIRE
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