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Geochemical data from the ~2.9-Ga Northern Pickle assemblage of the Pickle Lake greenstone belt in the northern Superior Province distinguish three distinct volcanic suites. Suite I, from the north of the assemblage, comprises tholeiitic basalts with unfractionated rare earth elements (REE). Suite II basalts are light REE (LREE)-enriched with negative mantle-normalized Nb anomalies relative to Th...
Relatively low concentrations of Rb and high K/Rb ratios are characteristic of many granulite facies terranes. This depletion in Rb has been attributed to both the removal of a partial melt and exchange with a metamorphic fluid phase. These models have been tested using Rb concentrations in biotites and whole rocks from intermediate and felsic gneisses collected along a traverse from just north of...
In this study, phlogopite synthesis experiments were carried out at 800 o C and at 1000 and 2000 MPa for low concentrations of Rb (X Rb =Rb/(Rb+K)<0.1) in a concentrated (K,Rb)Cl brine+(Rb,K)Cl salt (X H2Obulk =0.3). For each experiment, solid run products consisted of approximately 70-80% phlogopite (X Rb =0.03-0.12) with...
Two lithologic assemblages are recognized in the 1.75-Ga Iron King Volcanics in west-central Arizona: an arc assemblage composed of pillow basalts, intermediate and felsic volcanics and associated volcaniclastic sediment, and an oceanic plateau assemblage composed chiefly of pillow basalts and mafic hyaloclastic breccia. During collision of the Iron King oceanic plateau with Laurentia 1.7 Ga, plateau...
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