Application of 55 multi-dimensional tectonomagmatic discrimination diagrams to Precambrian belts
Por:
Verma S.P., Verma S.K., Oliveira E.P.
Publicada:
10 sep 2015
Categoría:
Geology
Resumen:
Fifty-five new multi-dimensional diagrams, mostly based on log-ratio
transformations, were used to decipher tectonic settings for 17 cases of
Precambrian belts in Canada, the USA, Poland, Finland, Jordan,
Democratic Republic of CongoandZambia, China, and India. The results of
different sets of diagrams for basic-ultrabasic, intermediate, and acid
magmas were generally internally consistent. Possible reasons for some
inconsistencies may be related to the use of a sample group of mixed
ages because of their uncertainties, extreme element mobility caused by
metamorphism especially of high-grade type, analytical data quality,
different petrogenetic processes for basic to acid magmas such as mantle
versus crustal origin, and some deficiencies that still exist in the
multi-dimensional diagrams. To partly overcome the last problem, one new
multi-dimensional diagram is proposed and used to discriminate mid-ocean
ridge and oceanic plateau settings.
Filiaciones:
Verma S.P.:
Univ Nacl Autonoma Mexico, Inst Energias Renovables, Dept Sistemas Energet, Temixco, Mexico
Verma S.K.:
Department of Geology and Natural Resources, Institute of Geosciences, University of Campinas - UNICAMP, Campinas, Brazil
Oliveira E.P.:
Department of Geology and Natural Resources, Institute of Geosciences, University of Campinas - UNICAMP, Campinas, Brazil
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