[Auscope-geosciml] RE : Testbed proposition [SEC=UNCLASSIFIED]

Stephen M Richard steve.richard at azgs.az.gov
Wed Mar 3 16:23:26 EST 2010

On 3/3/2010 12:14 PM, Boisvert, Eric wrote:
> Ok, looks like the ball stopped bouncing here.
> Do we go forward with the instance document from a legend/story ?  Do 
> we have agreement from people who commited to those use cases ?

I would certainly be interested in taking a real map unit description 
and putting it in GeoSciML, but I see it as a documentation/guidelines 
kind of artifact. Having several people do the encoding independently 
for several different descriptions, then 'harmonizing' the results for 
each description, and putting the description, the GeoSciML and 
describing the decisions made in a document would be very useful to have 
for teaching.

We just need to collect some descriptions to use.
for example, the one used by NADM:
 From Harald Drewes. 1998, Geologic map of the Bartlett Mountain 
Quadrangle, Pima and Santa Cruz counties, Arizona, USGS I-2624. Lat 31 
deg 22'30" to 31 deg 30', long 111 deg 15' to 111 deg 22'30". Scale 
1:24,000 (1 inch = 2,000 feet). The text of the legend item:
Dacitic Vent Breccia (Miocene) -Light-medium-gray, finely porphyritic 
dacitic rock containing inclusions of Jurassic or Proterozoic granite 
and Jurassic rhyolite (welded tuff?) as much as 20 m in diameter. The 
subcircular outcrop mass of breccia probably is a volcanic vent or 
throat. A halo of strongly saussuritized rock 0.3 -0.5 km wide 
(delineated on map) surrounds this vent. The dacitic matrix consists of 
phenocrysts (25-35%, as much as 2 mm in length) set in a 
cryptocrystalline granular groundmass. Phenocrysts included albitized(?) 
plagioclase (12-18%), chloritized biotite (2-5%), uralized amphibole 
(2-10%), magnetite (trace to 2%), and apatite (trace). Quartz is present 
as a secondary mineral, filing vugs.


Stephen M. Richard
Section Chief, Geoinformatics
Arizona Geological Survey
416 W. Congress St., #100
Tucson, Arizona, 85701 USA

Office: (520) 209-4127
Reception: (520) 770-3500
FAX: (520) 770-3505

email: steve.richard at azgs.az.gov

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