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
Download point for the data
+61 3 6226 2815
+61 3 6223 2547
Garry.Davidson at utas.edu.au
DEPARTMENT OF GEOLOGY
GPO BOX 252-79
University of Tasmania City:
Province or State:
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