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Genesis of Volcanic Rocks, Heard Island
Entry ID: ASAC_400


Summary
Abstract: Metadata record for data from ASAC Project 400
See the link below for public details on this project.

Taken from one of the referenced papers:

Oceanic basalts are produced by melting of the Earth's mantle and are widely used to probe its composition. The observation of systematic, coupled variations in the neodymium, strontium and lead isotopic compositions of these basalts has been widely interpreted as reflecting the mixing of identifiable mantle components. White and Zindler and Hart have suggested that the isotopic compositions of mid-ocean-ridge and ocean island basalts (MORB and OIB) can be considered as mixtures of a depleted MORB-type mantle component with a few other components reflecting long-term enrichment of Rb/Sr, Nd/Sm and/or U/Pb ratios. It remains unclear whether these components should be considered as hypothetical mixing endmembers, or whether they exist physically as mantle reservoirs. This question may be addressed if the mixing endmembers of individual mantle plumes can be identified. To this end, we report linear Pb-Pb and curvilinear Pb-Nd and Pb-Sr isotopic covariations in Recent lavas of Heard Island, southern Indian Ocean, indicating binary mixing. The hyperbolic relationships are unique among oceanic basalts and tightly constrain the isotopic compositions of the plume source components, which do not coincide with the mantle endmember components of ref. 3. If our results are generally applicable to other plumes, they call into question the existence of large mantle reservoirs corresponding to these components, and indicate that actual oceanic basalt source reservoirs have intermediate isotopic compositions.

Related URL
Link: View Related Information
Description: Public information for ASAC project 400


Link: View Related Information
Description: Download point for the data - pdf file - AAD Staff Only


Link: View Related Information
Description: Citation reference for this metadata record and dataset


Geographic Coverage
 N: -53.0 S: -54.0  E: 73.0  W: 72.0

Data Set Citation
Dataset Originator/Creator: Nicholls, I.
Dataset Title: Genesis of Volcanic Rocks, Heard Island
Dataset Series Name: CAASM Metadata
Dataset Publisher: Australian Antarctic Data Centre
Online Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...


Temporal Coverage
Start Date: 1986-09-30
Stop Date: 1995-03-31


Location Keywords
OCEAN > SOUTHERN OCEAN
GEOGRAPHIC REGION > POLAR
OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS


Science Keywords
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >IGNEOUS ROCKS    [Definition]
SOLID EARTH >TECTONICS >VOLCANIC ACTIVITY >ERUPTION DYNAMICS >LAVA COMPOSITION/TEXTURE    [Definition]


ISO Topic Category
null


Quality
Values provided in temporal and spatial coverage are approximate only.


Access Constraints
A pdf copy of one of the referenced papers is available for download from the provided URL to AAD staff only.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_400 when using these data.


Keywords
Heard Island
mantle
lava
reservoir
basalt


Data Set Progress
COMPLETE


Originating Center
Australian Antarctic Division


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 1,298 kb
Distribution_Format: pdf
Fees: free


Personnel
DAVE J. CONNELL
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia


Publications/References
Barling J., Goldstein S.L. (1990), Extreme isotopic variations in Heard Island lavas and the nature of mantle reservoirs., Nature, 348, 59

Barling J. (1990), Heard and McDonald Islands., Volcanoes of the Antarctic Plate and Southern Oceans, 48, 435-441

Barling J. (1990), The Petrogenesis of the Newer Lavas of Heard Island, Southern Indian Ocean, 496, Monash University

Creation and Review Dates
DIF Creation Date: 2000-10-12
Last DIF Revision Date: 2016-11-18



Link to Web Site