Diorite and gabbro of the Dromedary mafic complex, South Victoria Land, Antarctica

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Authors:Simpson, G.; Aslund, T.
Author Affiliations:Primary:
University of Otago, Geology Department, Dunedin, New Zealand
Volume Title:New Zealand Journal of Geology and Geophysics
Source:New Zealand Journal of Geology and Geophysics, 39(3), p.403-414. Publisher: Department of Scientific and Industrial Research (DSIR), Wellington, New Zealand. ISSN: 0028-8306
Publication Date:1996
Note:In English. 40 refs.; illus., incl. 3 tables, geol. sketch maps
Summary:The syntectonic Dromedary mafic complex is a well-preserved mafic body which was emplaced into Koettlitz Group metasediments during widespread late Proterozoic-Paleozoic granitoid plutonism, metamorphism, and deformation in South Victoria Land, Antarctica. The 4×9 km pluton is reversely zoned. It consists of a core of calc-alkaline cumulate and noncumulate gabbros—comprising gabbro, olivine gabbro, anorthosite, norite, and pyroxenite—surrounded by an outer margin of homogeneous pyroxene-bearing diorite. All rocks have undergone varying degrees of metamorphic reconstitution. The resulting assemblages are strongly controlled by original rock composition. Field relationships and geochemical data suggest that the diorite and gabbro are coeval and cogenetic. The Dromedary mafic complex has geochemical signatures distinct from most other nearby dioritic bodies. It does, however, plot as an extension of syntectonic granitoids from the Dry Valley region.
Subsections:Igneous petrology
Subjects:Diorites; Gabbros; Geochemistry; Igneous rocks; Intrusions; Mineral assemblages; Paleozoic; Petrography; Plutonic rocks; Plutons; Precambrian; Proterozoic; Upper Precambrian; Antarctica; Victoria Land; Dromedary Complex; Koettlitz Group
Coordinates:S781500 S781500 E1640000 E1630000
Abstract Numbers:99M/2164
Record ID:1997051112
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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