title: Contrasting Granite Metallogeny through the Zircon Record: A Case Study from Myanmar.
abstract: Granitoid-hosted mineral deposits are major global sources of a number of economically important metals. The fundamental controls on magma metal fertility are tectonic setting, the nature of source rocks, and magma differentiation. A clearer understanding of these petrogenetic processes has been forged through the accessory mineral zircon, which has considerable potential in metallogenic studies. We present an integrated zircon isotope (U-Pb, Lu-Hf, O) and trace element dataset from the paired Cu-Au (copper) and Sn-W (tin) magmatic belts in Myanmar. Copper arc zircons have juvenile εHf (+7.6 to +11.5) and mantle-like δ18O (5.2-5.5‰), whereas tin belt zircons have low εHf (-7 to -13) and heavier δ18O (6.2-7.7‰). Variations in zircon Hf and U/Yb reaffirm that tin belt magmas contain greater crustal contributions than copper arc rocks. Links between whole-rock Rb/Sr and zircon Eu/Eu* highlight that the latter can monitor magma fractionation in these systems. Zircon Ce/Ce* and Eu/Eu* are sensitive to redox and fractionation respectively, and here are used to evaluate zircon sensitivity to the metallogenic affinity of their host rock. Critical contents of Sn in granitic magmas, which may be required for the development of economic tin deposits, are marked by zircon Eu/Eu* values of ca. ≤0.08.
authors.affiliation: Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK. nicholas.gardiner@curtin.edu.au.|Centre for Exploration Targeting - Curtin Node, Department of Applied Geology, Western Australian School of Mines, Curtin University, Perth, WA, 6102, Australia. nicholas.gardiner@curtin.edu.au.
authors.forename: Nicholas J
authors.identifier: http://orcid.org/0000-0003-3465-9295
authors.initials: NJ
authors.lastname: Gardiner
authors.affiliation: School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, UK.
authors.forename: Chris J
authors.initials: CJ
authors.lastname: Hawkesworth
authors.affiliation: Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK.
authors.forename: Laurence J
authors.initials: LJ
authors.lastname: Robb
authors.affiliation: Department of Geological Sciences, Swedish Museum of Natural History, Box 50007, Stockholm, Sweden.
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Whitehouse
authors.affiliation: NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, NG12 5GG, UK.
authors.forename: Nick M W
authors.initials: NMW
authors.lastname: Roberts
authors.affiliation: Centre for Exploration Targeting - Curtin Node, Department of Applied Geology, Western Australian School of Mines, Curtin University, Perth, WA, 6102, Australia.
authors.forename: Christopher L
authors.initials: CL
authors.lastname: Kirkland
authors.affiliation: John De Laeter Centre, TIGeR, Department of Applied Geology, Curtin University, Perth, WA, 6102, Australia.
authors.forename: Noreen J
authors.initials: NJ
authors.lastname: Evans