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Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland

Sara Ladenburger, Michael A. W. Marks, Brian Upton, Peter Hill, Thomas Wenzel and Gregor Markl
Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland
American Mineralogist (March 2016) 101 (3): 612-626

Abstract

Textural and compositional variations of apatite from rift-related gabbros, syenogabbros, syenites, quartz-syenites, and nepheline syenites of the Mid-Proterozoic Gardar Province (South Greenland) are presented and compared to apatite compositions from other rock suites. The observed zoning textures of apatite are interpreted to represent (1) primary growth zonation (concentric and oscillatory) that formed during magmatic differentiation and (2) secondary irregular overgrowths, patchy zonation, and resorption textures, assigned to metasomatic overprinting due to interaction with fluids/melts and intra-crystalline diffusion. Compositional variation in the apatites is mainly due to coupled substitutions of Ca and P by variable amounts of Si, Na, and REE, which show increasing concentrations during magmatic differentiation. Furthermore, F concentrations in apatites increase from gabbroic through syenogabbroic to syenitic rocks, whereas Cl concentrations show the opposite trend.Compared to apatite compositions from gabbroic, dioritic, and granitic rocks in general, apatites from alkaline rock suites are characterized by exceptionally high contents of REE and Si and in some alkaline rocks they attain Sr contents comparable to those reported from carbonatites. Typical low Mn and S contents are probably a result of low oxygen fugacity during crystallization at relatively high temperatures.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 101
Serial Issue: 3
Title: Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland
Affiliation: Eberhard Karls Universitaet Tuebingen, Mathematisch-Naturwissenschaftliche Fakultaet, Tubingen, Germany
Pages: 612-626
Published: 201603
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 113
Accession Number: 2016-034532
Categories: Geochemistry of rocks, soils, and sedimentsMineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. table, sketch map
N60°00'00" - N65°00'00", W70°00'00" - W20°00'00"
Secondary Affiliation: University of Edinburgh, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201617
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