Genesis of Volcanic Rocks, Heard Island
Entry ID: ASAC_400

[ Update this Record ]

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 PROJECT HOME PAGE
Description: Public information for ASAC project 400


Link: VIEW RELATED INFORMATION
Description: Download point for the data - pdf file


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

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
GEOSCIENTIFIC INFORMATION


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.


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 at the provided URL when using these data.


Keywords
Heard Island
mantle
lava
reservoir
basalt


Data Set Progress
COMPLETE


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
IAN NICHOLLS
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +61 3 9905 4894
Email: ian.nicholls at sci.monash.edu.au
Contact Address:
Department of Earth Sciences
Monash University
City: Clayton
Province or State: Victoria
Postal Code: 3168
Country: Australia


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;

Creation and Review Dates
DIF Creation Date: 2000-10-12
Last DIF Revision Date: 2014-08-29

[ Update this Record ]


Link to Web Site