NOAA/WDS Paleoclimatology - McMurdo Sound, Antarctica, Eocene-Miocene Aragonite Cement Isotope Data
This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Paleoceanography. The data include parameters of paleoceanography with a geographic location of Ross Sea. The time period coverage is from 36000000 to 22000000 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data.
Dataset Citation
- Cite as: Yang, M.; Frank, T.D.; Fielding, C.R.; Smith, M.E.; Swart, P.K. (2019-11-30): NOAA/WDS Paleoclimatology - McMurdo Sound, Antarctica, Eocene-Miocene Aragonite Cement Isotope Data. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/e65m-z530. Accessed [date].
- Please refer to Credit tab for full citation information.
Dataset Identifiers
- doi:10.25921/e65m-z530
- noaa-ocean-28170
- NCEI DSI 1200_02
- NCEI DSI 1200_01
ISO 19115-2 Metadata
noaa-ocean-28170
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NOAA National Centers for Environmental Information ncei.info@noaa.gov |
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NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | Data Center Contact NOAA World Data Service for Paleoclimatology 828-271-4800 paleo@noaa.gov |
Coverage Description | Date Range: 36000000 cal yr BP to 22000000 cal yr BP; |
Time Period | -35998050 to -21998050 |
Spatial Bounding Box Coordinates |
West: 164.4986
East: 164.4986
South: -77.5819
North: -77.5819
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns |
Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Data update frequency not available |
Supplemental Information | STUDY NOTES: McMurdo Sound, Antarctica, Isotopic analysis of aragonite cement, uppermost Eocene through lower Miocene ABSTRACT SUPPLIED BY ORIGINATOR: Inorganic aragonite occurs in a wide spectrum of depositional environments and its precipitation is controlled by complex physio-chemical factors. This study investigates diagenetic conditions that led to aragonite cement precipitation in Cenozoic glaciomarine deposits of McMurdo Sound, Antarctica. A total of 42 sandstones that host intergranular cement were collected from the CIROS-1 core, located proximal to the terminus of Ferrar Glacier. Standard petrography, Raman spectroscopy and electron microprobe analysis reveal a prominent aragonite cement phase that occurs as a pore-filling blocky fabric throughout the core. Oxygen isotope compositions (d18O = -30.0 to -8.6 permil Vienna Pee-Dee Belemnite) and clumped isotope temperatures (TDelta47 = 13.1 to 31.5C) determined from the aragonite cements provide precise constraints on isotopic compositions (d18Ow) of the parent fluid, which mostly range from -10.8 to -7.2 permil Vienna Standard Mean Ocean Water. The fluid d18Ow values are consistent with those of pore water, previously identified as cryogenic brine in the nearby AND-2A core. Petrographic and geochemical data suggest that aragonite cement in the CIROS-1 core precipitated from a similar brine. The brine likely formed and infiltrated sediments in flooded glacial valleys along the western margin of McMurdo Sound during the middle Miocene Climatic Transition, and subsequently flowed basinward in the subsurface. Consequently, the brine forms as a longstanding subsurface fluid that has saturated Cenozoic sediments below southern McMurdo Sound since at least the middle Miocene. Aragonite cementation in the CIROS-1 core is interpreted to reflect its proximal position to sites of brine formation and greater likelihood of experiencing brines with sustained high carbonate saturation states and Mg/Ca ratios. This unusual occurrence expands the range of known natural occurrences of aragonite cement. Given the potential for cryogenic brine formation in glaciomarine settings, blocky aragonite, as the end member of the spectrum of aragonite cement morphology, may be more widespread in glaciomarine sediments than currently thought. |
Purpose | Records of past climate and ocean circulation derived from marine sediments. Parameter keywords describe what was measured in this dataset. Additional summary information can be found in the abstracts of papers listed in the dataset citations. |
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Last Modified: 2024-04-11
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov