HomeHome

Boron, carbon, and oxygen isotopic composition of brachiopod shells: Intra-shell variability, controls, and potential as a paleo-pH recorder

Donald E. Penman; Baerbel Hoenisch; E. Troy Rasbury; N. Gary Hemming; Howard J. Spero

Title:
Boron, carbon, and oxygen isotopic composition of brachiopod shells: Intra-shell variability, controls, and potential as a paleo-pH recorder
Author(s):
Penman, Donald E.
Hoenisch, Baerbel
Rasbury, E. Troy
Hemming, N. Gary
Spero, Howard J.
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Volume:
340
Persistent URL:
Book/Journal Title:
Chemical Geology
Abstract:
The boron isotopic composition of biogenic carbonates has been used to reconstruct seawater pH and atmospheric pCO2 on Pleistocene and Cenozoic timescales. Because of their excellent preservation and extensive fossil record throughout the Phanerozoic, brachiopods are a promising candidate for extending the boron isotope record as far back as the Cambrian. Here we present stable carbon, oxygen, and boron isotopic measurements of modern Terebratulid brachiopod calcite in comparison with environmental pH estimates calculated from oceanographic data. Geochemical transects along the length and depth of single shells confirm previously published trends in carbon and oxygen isotopic composition. In the outer surface (primary and outermost secondary layers), δ11B covaries with δ13C and δ18O, with more negative values in the outer and more positive values in the middle of the shell. However, δ11B deviates from δ13C and δ18O in the inner part of the secondary layer, where the δ13C and δ18O values are more positive and near equilibrium, whereas δ11B returns to more negative values. A comparison of different specimens of the species Terebratalia transversa (Sowerby, 1846) and Laqueus californianus (Küster, 1844) microsampled from the middle part of the fibrous secondary layer demonstrates a clear correlation to ambient pH with a sensitivity similar to other empirical calibration curves for cultured planktic foraminifers, corals, and inorganic calcite. The relationship in other species is less clear and significantly offset, necessitating the use of a single species or a cross-calibration method with other species in paleo-pH reconstructions.
Subject(s):
Chemical oceanography
Paleontology
Publisher DOI:
https://doi.org/10.1016/j.chemgeo.2012.11.016
Item views
410
Metadata:
text | xml
Suggested Citation:
Donald E. Penman, Baerbel Hoenisch, E. Troy Rasbury, N. Gary Hemming, Howard J. Spero, , Boron, carbon, and oxygen isotopic composition of brachiopod shells: Intra-shell variability, controls, and potential as a paleo-pH recorder, Columbia University Academic Commons, .

Columbia University Libraries | Policies | FAQ