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List J - Metamorphic rocks

List J-1  Metamorphic rocks - alphabetical list
List J-2  Metamorphic rocks - hierarchical list

General notes
These thesaurus lists, lists A-R, are used by GeoRef indexers for selecting index terms and by searchers for additional information not necessarily found in individual term records in the body of the Thesaurus. In most cases, an hierarchical list is given. In some cases, an alphabetical or other list is provided.

The notes under Searching attempt to guide the searcher in the use of the list. Searchers might also read the notes on Indexing for further clues but should be aware that these notes reflect current practice which in some cases differs from past practice. Further notes on specific terms are in the body of the Thesaurus and additional notes on searching are in the GeoRef Thesaurus, 11th edition Introduction section on searching beginning on page x. Information specific to searching and the individual list topics is included, e.g., a section including metamorphic rocks begins on page xii.

Under Indexing the current indexing practice is given. These notes should be read along with the instructions under the individual terms in the body of the Thesaurus.

Metamorphic rocks
Two lists are provided, an hierarchical list and alphabetical list which gives a table of group names. Cases of incomplete autoposting are marked on both. Metasomatic rocks are considered a subgroup of metamorphic rocks.

The term petrology may be used in papers pertaining to the discipline. Where the process metamorphism is stressed, it is also used.

Searching
Papers with major emphasis on these rocks can be retrieved by searching for metamorphic rocks as a major descriptor. Igneous and metamorphic petrology (05A) may also be searched as a category, see List A. For more information see the specific rock names in the body of the Thesaurus.
Related topics such as intrusions, isotopes, magmas, metamorphism, metasomatism, phase equilibria, etc. can be searched separately.

For metamorphic rocks which are commodities, see List C-1.

For specific searches on a certain rock, use the rock name, stemmed or truncated to find variants.

For composite rock names, e.g. biotite gneiss, it is advisable to search both the specific rock name and the separate parts of the name stemmed and combined.

Indexing
Index the most specific term from the alphabetical list. If the term does not appear in the list, add it in the singular, and index a higher level term that appears on the list.

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