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List D - Chemical hierarchies, methods,
List D Chemical methods and data terms
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 on age-dating methods begins on page xi.
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.
Some useful terms are deuterium and tritium. Some useful groups are:
Three terms related to chemical elements which are used extensively are major elements, minor elements, and trace elements.
The term isotopes is autoposted to its narrower terms. Isotopes are generally used with their number, e.g. C-14, and the ratios are used in an expanded form, e.g. O-18/O-16. For isotopes used in absolute age dating, see the format reflected in List B.
Chemical methods and data terms
The chemical methods and data terms which are included in the body of this Thesaurus are found in List D. In most cases, geochemical methods and data terms differ. Methods-type terms are used for studies emphasizing methods, techniques, and instruments. Data-type terms are used only for reports of actual analysis.
For economic references, see List C.
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