From Australian Oceans Data Network
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East Antarctic sediment carbonate mineralogy, 2020

Created 24/06/2025

Updated 24/06/2025

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Marine sediments often represent an important reservoir of carbonate minerals that will react rapidly to changing seawater chemistry as a result of ocean acidification. Ocean acidification (the reaction of CO2 with seawater) lowers the saturation state with respect to carbonate minerals and may lead to dissolution of these minerals if undersaturation occurs. There are three main carbonate minerals found in marine sediments: 1. aragonite 2. calcite (also referred to as low-magnesium calcite, containing less than 4mol% MgCO3) 3. high-magnesium calcite (greater than 4 mol% MgCO3) Due to the different structure of these minerals, they have different solubilities with high-Mg calcite the most soluble, followed by aragonite and then calcite. As seawater CO2 increases and the saturation state with respect to carbonate minerals decreases, high-Mg calcite will be the first mineral subject to undersaturation and dissolution. By measuring the carbonate mineral composition of sediments, we can determine which areas are most at risk from dissolution. This information forms an important baseline with which we can assess future climate change. The effect of ocean acidification on carbonates in marine sediments will occur around the world, but due to the lower seawater temperatures in Antarctica, solubility is much lower so the impacts will occur here first. This dataset is a compilation of carbonate mineralogy data from surface sediments collected from the East Antarctic margin. The dataset includes sample metadata, bulk carbonate content, %calcite, % aragonite and mol% MgCO3 (i.e. the magnesium content of high-Mg calcite). This dataset was compiled from new (up to 2020) and archived sediment samples that contacted sufficient carbonates (typically greater than 3% CaCO3)/

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Additional Info

Field Value
Title East Antarctic sediment carbonate mineralogy, 2020
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/d710091f-10a4-4260-8f8f-ce31454028bb
Contact Point
Australian Ocean Data Network
metadata@aad.gov.au
Reference Period 01/07/2014 - 30/06/2020
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        64.0,
        -69.0
      ],
      [
        147.0,
        -69.0
      ],
      [
        147.0,
        -64.0
      ],
      [
        64.0,
        -64.0
      ],
      [
        64.0,
        -69.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Australian Oceans Data Network

Data Source

This dataset was originally found on Australian Oceans Data Network "East Antarctic sediment carbonate mineralogy, 2020". Please visit the source to access the original metadata of the dataset:
https://catalogue.aodn.org.au/geonetwork/srv/eng/csw/dataset/east-antarctic-sediment-carbonate-mineralogy-2020