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Environmental Controls on the Geoche...

Reynolds, Caitlin Elizabeth.

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Environmental Controls on the Geochemistry of Globorotalia truncatulinoides in the Gulf of Mexico: Implications for Paleoceanographic Reconstructions.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Environmental Controls on the Geochemistry of Globorotalia truncatulinoides in the Gulf of Mexico: Implications for Paleoceanographic Reconstructions./
Author:	Reynolds, Caitlin Elizabeth.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	48 p.
Notes:	Source: Masters Abstracts International, Volume: 58-01.
Contained By:	Masters Abstracts International58-01(E).
Subject:	Marine geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10838149
ISBN:	9780438280007

Environmental Controls on the Geochemistry of Globorotalia truncatulinoides in the Gulf of Mexico: Implications for Paleoceanographic Reconstructions.
Reynolds, Caitlin Elizabeth.

Environmental Controls on the Geochemistry of Globorotalia truncatulinoides in the Gulf of Mexico: Implications for Paleoceanographic Reconstructions. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 48 p.

Source: Masters Abstracts International, Volume: 58-01.

Thesis (M.S.)--University of South Florida, 2018.

Modern observations of planktic foraminifera from sediment trap studies help to constrain the regional ecology of paleoceanographically valuable species. Results from a weekly-resolved sediment trap time series (2008--2014) in the northern Gulf of Mexico demonstrate that 92% of Globorotalia truncatulinoides flux occurs in winter (January, February, and March), and that encrusted and non-encrusted individuals represent calcification in distinct depth habitats. We use individual foraminiferal analysis (IFA) of G. truncatulinoides tests to investigate differences in the elemental (Mg/Ca) and isotopic composition (delta18O and delta 13C) of the encrusted and non-encrusted ontogenetic forms of G. truncatulinoides, and to estimate their calcification depth in the northern Gulf of Mexico. We estimate that non-encrusted and encrusted G. truncatulinoides have mean calcification depths of 66 +/- 9 meters and 379 +/- 76 meters, respectively. We validate the Mg/Ca-calcification temperature relationship for G. truncatulinoides and demonstrate that the delta18O and Mg/Ca of the non-encrusted form is a suitable proxy for winter surface mixed layer conditions in the Gulf of Mexico. Care should be taken not to combine encrusted and non-encrusted individuals of G. truncatulinoides for down core paleoceanographic studies.

ISBN: 9780438280007Subjects--Topical Terms:

3173821
Marine geology.

Environmental Controls on the Geochemistry of Globorotalia truncatulinoides in the Gulf of Mexico: Implications for Paleoceanographic Reconstructions.
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