ORIGINAL PAPER Aluminum-dependent trace element partitioning in clinopyroxene

• Main Authors: Don Francis, Æ William Minarik
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Carmacks; Yukon
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.582.5405; http://eps.mcgill.ca/~minarik/pubs/Francis_Minarik_2008.pdf

increased our ability to analyze trace elements, the need for more reliable data on the compositional dependence of trace element partitioning between minerals and melt has become increasingly important. The late-Cretaceous Carmacks Group of south central Yukon comprises a succession of primitive high-Mg ankaramitic lavas characterized by shoshonitic chemical affinities and containing large com-plexly zoned clinopyroxene phenocrysts. The compositional zonation of the clinopyroxene phenocrysts is characterized by relatively Fe-rich (Mg # = Mg/(Mg + Fe) = 0.85), but mottled, cores surrounded by mantles of cyclically-zoned clinopyroxene whose Mg # varies repeatedly between 0.9 and 0.80. These cyclically zoned clinopyroxene mantles appear to record the repeated influx and mixing of batches of primitive with more evolved magma in a deep sub-crustal