Affiliation:
1. Institute of Geology and Geochemistry UB RAS
2. South Urals Federal Research Center of Mineralogy and Geoecology UB RAS
3. St. Petersburg State University
Abstract
The miarolitic dunites of the Nizhny Tagil massif (Central Urals), the structure of miaroles and the principles of co-occurrence of minerals are studied. Garnets from miaroles are characterized in details and are compared with those from chromitites and metasomatites after dunites. The structure of miarolitic dunites and miaroles is described using ontogenic approaches. The structure and composition of garnets are studied by SEM and LA-ICP-MS. Three assemblages of garnets are established in rocks of the Nizhny Tagil massif: Cr-andradite in miarolitic dunites, uvarovite in massive veined chromitites and demantoid in metasomatites after dunites. Garnets from all assemblages belong to the ugrandite group and are characterized by specifc features of chemical composition including higher Cr2O3 content. Garnets are also characterized by contrasting concentrations of trace elements, such as V, Mn and Ti, as well as differences in REE pattern. A paragenetic sequence of formation of major rock-forming minerals is suggested for dunites, chromites and metasomatites after dunites of the Nizhny Tagil massif.
Publisher
South Urals Federal Research Center for Mineralogy and Geoecology of the Urals Branch of the RAS
Subject
General Psychology,Arts and Humanities (miscellaneous),Education,General Business, Management and Accounting,Education,Psychiatry and Mental health,Health Professions (miscellaneous),Law,Cognitive Neuroscience,Developmental and Educational Psychology,Education,Experimental and Cognitive Psychology,Political Science and International Relations,History,Management Science and Operations Research,Artificial Intelligence,General Engineering,Statistics and Probability,Electrical and Electronic Engineering,Artificial Intelligence,Industrial and Manufacturing Engineering,Mechanical Engineering,Control and Systems Engineering,Software,Artificial Intelligence,Computer Networks and Communications,Hardware and Architecture,Information Systems,Software
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