A proposed new mineralogical classification system for granitic pegmatites
伟晶岩
深熔
地质学
地球化学
深成岩体
部分熔融
地震学
地幔(地质学)
构造学
作者
Michael A. Wise,Axel Müller,William B. Simmons
出处
期刊:Canadian Mineralogist [Mineralogical Association of Canada] 日期:2022-03-01卷期号:60 (2): 229-248被引量:46
标识
DOI:10.3749/canmin.1800006
摘要
ABSTRACT The current classification of granitic pegmatites, originally introduced by Černý (1991a), has been the accepted system for grouping pegmatites of diverse mineralogy and chemistry for nearly three decades. Despite its general acceptance, several issues have been highlighted (Müller et al. 2022) which have imposed some limitations on its use and therefore necessitated the need to reevaluate its methodology. A new classification for granitic pegmatites is proposed in an attempt to be more inclusive of pegmatite types omitted in previous classification schemes. The new approach utilizes a more comprehensive suite of accessory minerals and defines three pegmatite groups which are genetically related to granite plutons and the anatexis of metaigneous and metasedimentary protoliths. Pegmatites belonging to Groups 1 and 2 are generated from the residual melts of S-, A-, and I-type granite magmatism (RGM) as well as being direct products of anatexis (DPA), whereas Group 3 pegmatites are only derived by anatexis.