What Is "Alteration" In The USGS?
Mineralogical and chemical alteration at or near the site, which may help to indicate the geographic extent of the geological processes producing the deposit.
Term Definitions
- DEP_ID
- Site or deposit identification number within this database, used as a key linking all tables containing information about the site.
- Line
- (LINE) Sequence index of this table record for the given DEP_ID.
- Type
- (ALT_TYPE) General extent of the alteration described, either L for local or R for regional.
- Category
- (ALTERAT) Controlled terms categorizing alteration at or near the site.
- Text
- (ALTERAT_TEXT) Description of the alteration of the original mineral assemblage, for example propylitic, argillic, potassic, silicic as given in the original MRDS database.
- INSERTED_BY
- Database user who inserted this record.
- INSERT_DATE
- Date this table record was first entered.
- UPDATED_BY
- Database user who last updated this record
- UPDATE_DATE
- Date this table record was last updated.
- (table)
- Mineralogical and chemical alteration at or near the site, which may help to indicate the geographic extent of the geological processes producing the deposit.
