Tectonic, magmatic and hydrothermal evolution of ocean floor spreading at Macquarie Island
Entry ID: ASAC_1318

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Summary
Abstract: Macquarie Island offers a rare land-based cross-section through the deep ocean floor, which covers 60% of our Earth. It formed 11 million years ago as slow spreading crust, which has had minimal study compared to more common fastspreading crust. Does the difference in spreading speed produce different crustal geometry, composition, hydrothermal fluids, and cycling of sulfur between ocean and crust? To gain insights to these and related questions, we propose to study uplifted and eroded sections through a series of fault zones, spaced along the length of Macquarie Island, which were the last magmatic, structural and hydrothermal events to occur before shifting stresses drove the seafloor up to form the Macquarie Ridge mountain chain.

This dataset is a summary of samples obtained by Mr Steve Lewis for the purposes of investigating hydrothermal alteration in oceanic crust on Macquarie Island. Samples derive from the major lake, Lusitania Bay, and Caroline Cove areas. Each sample consists of rock chips up to a maximum of 1 kg.

Samples were all obtained by hand with a geological hammer.

The fields in this dataset are:

Sample
Easting Northing
Date
Location
Transect
Details

Related URL
Link: GET DATA
Description: Download point for the data


Link: VIEW PROJECT HOME PAGE
Description: Public information for ASAC project 1318


Link: VIEW RELATED INFORMATION
Description: Citation reference for this metadata record and dataset


Geographic Coverage
 N: -54.0 S: -54.0  E: 159.0  W: 158.0

Temporal Coverage
Start Date: 2001-08-01
Stop Date: 2003-03-31


Location Keywords
OCEAN > SOUTHERN OCEAN
OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND
GEOGRAPHIC REGION > POLAR


Science Keywords
SOLID EARTH >TECTONICS >PLATE TECTONICS    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION
OCEANS


Platform
FIELD SURVEYS    [Information]


Quality
The dates provided in temporal coverage are approximate only. Year and month are correct.


Access Constraints
These data are publicly available for download at 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 provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_1318 when using these data.


Keywords
HYDROTHERMAL ALTERATION
MACQUARIE ISLAND
OCEAN FLOOR
SPREADING


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: 33 kb
Distribution_Format: excel
Fees: free


Personnel
GARRY DAVIDSON
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6226 2815
Fax: +61 3 6223 2547
Email: Garry.Davidson at utas.edu.au
Contact Address:
DEPARTMENT OF GEOLOGY
GPO BOX 252-79
University of Tasmania
City: Hobart
Province or State: Tasmania
Postal Code: 7001
Country: Australia


Publications/References
Varne R., Brown A.V., Falloon T. (2000), Macquarie Island: its geology and structural history, and the timing and tectonic setting of its N-MORB to E-MORB magmatism

Dilek Y., Moores E., Elthon D. and, Nicolas A. (Unknown), Ophiolites and oceanic crust: new insights from field studies and the Ocean Drilling Program, Geological Society of America, Special Publication, 349, 301-320

Alt J.C., Davidson G.J., Teagle D.A.H., Karson J.A. (2003), Isotopic composition of gypsum in the Macquarie Island ophiolite: Implications for the sulfur cycle and the subsurface biosphere in oceanic crust., Geology, 31, 6, 549-552

Davidson G.J., Varne R., Brown A.V. (2000), The ocean crust dike/basalt hydrothermal sulfur anomaly-insights into its growth and geometry during crustal extension on Macquarie Island, Australian Geological Society, 59, 117

Davidson G.J., Varne R., Brown A.V. (2000), The ocean crust dyke/basalt hydrothermal sulfur anomaly- insights into its growth and geometry during crustal extension on Macquarie Island, Southern Ocean., Geological Society of Australia, 59, 117

Creation and Review Dates
DIF Creation Date: 2001-04-09
Last DIF Revision Date: 2014-01-10

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