Some critical differences between orogenic-plutonic and gravity-stratified anorthosites |
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Authors: | Dr Jevan P Berrangé |
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Institution: | (1) Present address: Photogeological Division, Institute of Geological Sciences, F Block, Leatherhead Road, Chessington, England |
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Abstract: | A comparison of plutons containing anorthosite as a major or minor constituent, in North America, West Greenland, West Europe, Africa and India, shows that there are two essentially different environments in which this rock occurs: There are orogenic-plutonic anorthosites which are temporally and spatially related to orogeny and belong to the plutonic class of rocks; there are gravity-stratified anorthosites which developed under stable cratogenic conditions and belong to the volcanic class of rocks. The environment, age, form, internal structures, textures, mineralogical composition, gravity fields, associated salic rocks and contact effects characteristic of these two great classes of anorthosite are compared, contrasted and tabulated. There are certain anorthosite-bearing plutons which have features more or less typical of both classes. An Anorthosite Series is proposed:
Zusammenfassung Plutone, die Anorthosite als Hauptoder Nebenbestandteile enthalten, werden verglichen, und zwar aus Nordamerika, Westgrönland, Westeuropa, Afrika und Indien. Dieser Vergleich zeigt, daß es sich hier um zwei grundsätzlich verschiedene Umgebungen handelt, in denen diese Gesteine vorkommen. Es gibt Orogen-plutonische Anorthosite , die zeitlich und räumlich an Orogenesen gebunden sind und zu den plutonischen Gesteinen gehören; anderseits gibt es Anorthosite, die durch Schwerkraft gebändert sind und die sich unter stabilen, kratogenen Bedingungen bildeten und zu den vulkanischen Gesteinen zu zählen sind. Diese beiden großen Klassen werden in bezug auf ihre Umgebung, Alter, Form, Internstrukturen, Texturen, mineralogische Zusammensetzung, Schwerefelder, vergesellschaftete saure Gesteine und Kontakteffekte verglichen, gegenübergestellt und in Tafeln erläutert. Es gibt gewisse Anorthosit-führende Plutone, die Charakterzüge tragen, die mehr oder weniger für beide Klassen typisch sind. Es wird eine Anorthosit-Serie vorgeschlagen:
Résumé Une comparaison de plutons contenant de l'anorthosite comme constituant majeur ou mineur, en Amérique du Nord, Groenland occidental, Europe occidentale, Afrique et Inde montre qu'il y a deux environments essentiellement différents dans lesquels cette roche se présente. Il y a les « anorthosites plutoniques-orogéniques » qui sont temporairement et spatialement reliées à une orogène et appartiennent au groupe des roches plutoniques. Il y a les « anorthositiques stratiphiés par gravité » qui se sont développésent dans des conditions cratogènes stables et qui appartiennent au groupe des roches volcaniques. L'environment, l'âge, la forme, les structures internes, les textures, la composition minéralogique, les champs de gravité, les roches saliques associées et les effets de contact, caractéristiques de ces deux grandes classes d'anorthosites sont comparés, opposés et classés. Il y a certains plutons riches en anorthosite qui ont des caractères plus ou moins typiques des deux groupes. Une « série Anorthositique » est ainsi proposée:
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