Data from marine sediment core MOZ4-CS09

Date 2018-11-21
Author(s) Counts John1, Jorry StephanORCID1, Vazquez Riveiros NataliaORCID1, Jouet Gwenael1, Giraudeau Jacques2, Cheron Sandrine1, Boissier AudreyORCID1, Miramontes Garcia Elda3
Affiliation(s) 1 : Ifremer, Unité de Géosciences Marines, Pointe du Diable, 29200, Plouzané, France
2 : UMR CNRS 5805 EPOC, Université de Bordeaux, 33615, Pessac, France
3 : Laboratoire Géosciences Océan, UMR 6538, CNRS-IUEM-UBO, 29280, Plouzané, France
DOI 10.17882/58006
Publisher SEANOE
Keyword(s) sedimentology, Quaternary, carbonate, deep marine
Abstract

A 27-meter core collected on the seafloor (1909 meters depth) near Juan de Nova island preserves a high-resolution record of carbonate export to the deep sea over the past 1 Myr. Core chronology was established using calcareous nannofossil biostratigraphy and benthic foraminiferal δ18O, which was correlated with variations in the aragonite content within seafloor muds. Throughout the core, preserved highstand intervals (MIS 1, 5, 7, 9, 11, 13, 15, 23 and 25) are marked by an increase in the aragonite content within the sediment. Aragonite is likely sourced from the nearby Juan de Nova carbonate platform ~10 km to the south, and is interpreted to result from flooding of the platform top. Platform inundation allows carbonate muds to be winnowed from their original shallow-water environment of deposition, suspended in the water column, and redeposited into the proximal slopes and basin. Sharp increases in aragonite content at the beginning of each highstand interval can be used to estimate the approximate sea level range when platform flooding occurred; results show that the depth of the platform top has likely changed little over the past 1 Myr due to balanced aggradation and subsidence. Previously hypothesized large-scale aragonite dissolution cycles are evidenced by a disproportionally low aragonite response during MIS 11. This study provides a new, exceptionally long record of highstand shedding, expanding the known occurrences of the process to the southern Indian Ocean and supporting its importance as a globally significant depositional mechanism that impacts deep-sea stratigraphic records.

Licence CC-BY
Data
File Size Format Processing Access
60423.csv 82 KB CSV Raw data Open access
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How to cite 

Counts John, Jorry Stephan, Vazquez Riveiros Natalia, Jouet Gwenael, Giraudeau Jacques, Cheron Sandrine, Boissier Audrey, Miramontes Garcia Elda (2018). Data from marine sediment core MOZ4-CS09. SEANOE. https://doi.org/10.17882/58006


In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :


Counts John, Jorry Stephan, Vazquez Riveiros Natalia, Jouet Gwenael, Giraudeau Jacques, Cheron Sandrine, Boissier Audrey, Miramontes Elda (2019). A Late Quaternary record of highstand shedding from an isolated carbonate platform (Juan de Nova, southern Indian Ocean). Depositional Record, 5(3), 540-557. Publisher's official version : https://doi.org/10.1002/dep2.57 , Open Access version : https://archimer.ifremer.fr/doc/00474/58553/