Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/70713
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Clay mineral continental amplifier for marine carbon sequestration in a greenhouse ocean |
Author: | Kennedy, M. Wagner, T. |
Citation: | Proceedings of the National Academy of Sciences of USA, 2011; 108(24):9776-9781 |
Publisher: | Natl Acad Sciences |
Issue Date: | 2011 |
ISSN: | 0027-8424 1091-6490 |
Statement of Responsibility: | Martin J. Kennedya and Thomas Wagner |
Abstract: | The majority of carbon sequestration at the Earth’s surface occurs in marine continental margin settings within fine-grained sediments whose mineral properties are a function of continental climatic conditions. We report very high mineral surface area (MSA) values of 300 and 570 m2 g in Late Cretaceous black shales from Ocean Drilling Program site 959 of the Deep Ivorian Basin that vary on subcentennial time scales corresponding with abrupt increases from approximately 3 to approximately 18% total organic carbon (TOC). The observed MSA changes with TOC across multiple scales of variability and on a sample-by-sample basis (centimeter scale), provides a rigorous test of a hypothesized influence on organic carbon burial by detrital clay mineral controlled MSA. Changes in TOC also correspond with geochemical and sedimentological evidence for water column anoxia. Bioturbated intervals show a lower organic carbon loading on mineral surface area of 0.1 mg-OC m-2 when compared to 0.4 mg-OC m-2 for laminated and sulfidic sediments. Although either anoxia or mineral surface protection may be capable of producing TOC of < 5%, when brought together they produced the very high TOC (10–18%) apparent in these sediments. This nonlinear response in carbon burial resulted from minor precession-driven changes of continental climate influencing clay mineral properties and runoff from the African continent. This study identifies a previously unrecognized land–sea connection among continental weathering, clay mineral production, and anoxia and a nonlinear effect on marine carbon sequestration during the Coniacian-Santonian Oceanic Anoxic Event 3 in the tropical eastern Atlantic. |
Keywords: | Climate change cretaceous ocean source rocks ocean dead zones |
Rights: | Freely available online through the PNAS open access option. |
DOI: | 10.1073/pnas.1018670108 |
Published version: | http://dx.doi.org/10.1073/pnas.1018670108 |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications Environment Institute Leaders publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.