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Host Rock
MINFILE Coding Manual
Host Rock
5. HOSTROCK
5.1 Dominant Hostrock
5.2 Formal/Informal Host
5.3 Stratigraphic Age
5.4 Isotopic Age
5.5 Material Dated
5.6 Dating Method
5.7 Rock Type/Lithology
5.8 Comments - Host rock
When coding online select the options from the corresponding list boxes.
Online help is also available from the MINFILE/www online coding card.
5.1 DOMINANT HOSTROCK(*) (R03) (E03)
This is a mandatory field identifying the most
significant hostrock type. The hostrock is normally
defined as the type of rock in which the
mineralization occurs. Only one dominant hostrock
is accepted by the system.
5.2 FORMAL/INFORMAL HOST(*) (R23) (E23)
CODE HOSTROCK TYPE
1 Sedimentary
2 Plutonic
3 Volcanic
4 Metasedimentary
5 Metaplutonic
6 Metavolcanic
7 Metamorphic
* Unknown
Each MINFILE occurrence requires at least one FORMAL or INFORMAL HOSTROCK. Both categories
may be entered for any given occurrence; the system will accept a maximum of two FORMAL (groups
and formations) and two INFORMAL (plutonic, metamorphic, etc.) hostrocks. The HOST units are
entered into the database using the Group, Formation, Igneous-Metamorphic and Informal host names
in Appendix IV. New names and their corresponding codes will be added to the master table
periodically as required. The hostrock name(s) must be written out in full on the coding card.
FORMAL hostrocks are those with an officially established Group, Formation, or other stratigraphic
name. INFORMAL hostrocks include formal names for igneous and metamorphic units as well as
informal names or general terms which are not part of the stratigraphic nomenclature (e.g., plateau
basalt).
Group and Formation names are entered in the FORMAL HOST category. Informal, igneous, or
metamorphic units must be entered in the INFORMAL HOST category.
file:///C|/HardcopyManual/06_codehoro.htm (1 of 3)2007-09-20 4:09:05 PM