[Auscope-geosciml] Alteration vocabularies [SEC=UNCLASSIFIED]

Bruce.Simons at dpi.vic.gov.au Bruce.Simons at dpi.vic.gov.au
Mon Oct 19 21:19:05 EDT 2009 

- Not quite.  It’s about relating the alteration in a geologic unit to 
some structure.  Only if the unit type is an AlterationUnit would the 
entire unit be related to an alteration-controlling structure.  For 
instance, alteration in a LithostratigraphicUnit might be only a small 
feature of the unit as a whole.  So I would keep this relation with 
AlterationDescription, not GeologicUnit.  Alternately, I would have to 
create a GeologicUnitPart/AlterationUnit for the altered unit parts - that 
may be OK for some, but I don’t think GA’s data would support that.

OK. So the association is between the AlterationDescription and the 
definingStructure:GeologicStructure.

Bruce

GeoScience Victoria
EARTH RESOURCES DIVISION
Department of Primary Industries
Melbourne, Victoria
AUSTRALIA
Ph: +61-3-9658 4502
Fax: +61-3-9658 4555 
Mobile: +61 429 177155



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see below
 
------------------------------------------------------------------------------------------------
Ollie Raymond
National Advice,  Maps and Standards Project
Geoscience Australia
 
Address: GPO Box 378, Canberra, ACT, 2601, Australia | ABN: 80 091 799 039
Ph: (02) 62499575 | Fax: (02) 62499992 | Email: Oliver.Raymond at ga.gov.au 
Web:  
http://www.ga.gov.au/minerals/research/national/nat_maps/nat_geol_maps.jsp
Google Map 
 
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Bruce.Simons at dpi.vic.gov.au
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Subject: Re: [Auscope-geosciml] Alteration vocabularies [SEC=UNCLASSIFIED]
 

Hi Ollie, 
Hi Bruce,

- Alteration Scale - eg; mm, cm, m, km 
What is this used for? 
- an indicator of the size of your alteration zone. eg; local vein selvage 
alteration occurs over centimetres, or mining district alteration zones 
occur over kilometres.  Personally, I’m ambivalent about adding this one, 
but it’s an attribute used by our geologists.

- Alteration Texture - eg; cockade, colloform, comb, dog tooth, fibrous, 
bladed, banded, vuggy, saccharoidal, opaline, laminated, massive (Would 
have to define this well to separate it from AlterationDistribution) 
Can the "FabricDescription" class on RockMaterial be used for this when 
describing the EarthMaterial? Do we need a general "FabricDescription" 
class associated with GeologicUnit to capture terms like "massive" when 
applied to the GeologicUnit? (All those who were at Perth in 2004 may now 
have a deja vu moment!). 
- Yes, you could use RockMaterial/FabricDescription for this.  
- I wasn’t at Perth, but was the decision made that to describe a fabric 
in a unit, you have to describe the fabric of the EarthMaterial of the 
unit?  I’m OK with that.
- On a slightly related issue, do we need AlterationDescription associated 
with a RockMaterial?

- Alteration Controlling Fabric or Structure - eg; foliation, bedding, 
shearing, faulting, brecciation 
This is about relating the GeologicStructure:Foliation to the GeologicUnit 
using GeologicRelation. I don't believe this has actually been tested as 
yet.  Perhaps it should be tested as part of GeoSciML v2.1 or v 3.0 
testing.  Any takers? 
- Not quite.  It’s about relating the alteration in a geologic unit to 
some structure.  Only if the unit type is an AlterationUnit would the 
entire unit be related to an alteration-controlling structure.  For 
instance, alteration in a LithostratigraphicUnit might be only a small 
feature of the unit as a whole.  So I would keep this relation with 
AlterationDescription, not GeologicUnit.  Alternately, I would have to 
create a GeologicUnitPart/AlterationUnit for the altered unit parts - that 
may be OK for some, but I don’t think GA’s data would support that.

Cheers 
Bruce

GeoScience Victoria
EARTH RESOURCES DIVISION
Department of Primary Industries
Melbourne, Victoria
AUSTRALIA
Ph: +61-3-9658 4502
Fax: +61-3-9658 4555 
Mobile: +61 429 177155 


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Subject
[Auscope-geosciml] Alteration vocabularies [SEC=UNCLASSIFIED]
 


 
 




Hi Steve, 
  
I’ve attached some lookup tables from GA for hydrothermal alteration that 
might be added to the weathering vocabularies for AlterationDescription in 
GeoSciML3. 
  
Also, we use a few additional attributes for describing alteration that 
the modelling team may be interested in adding to the 
AlterationDescription class: 
  
- Alteration Scale - eg; mm, cm, m, km 
- Alteration Texture - eg; cockade, colloform, comb, dog tooth, fibrous, 
bladed, banded, vuggy, saccharoidal, opaline, laminated, massive (Would 
have to define this well to separate it from AlterationDistribution) 
- Alteration Controlling Fabric or Structure - eg; foliation, bedding, 
shearing, faulting, brecciation 
  
Any thoughts? 
  
Cheers, 
Ollie 
  
  
  
------------------------------------------------------------------------------------------------ 

Ollie Raymond
National Advice,  Maps and Standards Project 
Geoscience Australia 
  
Address: GPO Box 378, Canberra, ACT, 2601, Australia | ABN: 80 091 799 039 

Ph: (02) 62499575 | Fax: (02) 62499992 | Email: Oliver.Raymond at ga.gov.au 
Web:  
http://www.ga.gov.au/minerals/research/national/nat_maps/nat_geol_maps.jsp 

Google Map 
  
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