Neoproterozoic continental arc system along the NW margin of Rodinia supercontinent: Constraints from geochronological and geochemical studies of Neoproterozoic granitoids in the Diancangshan Massif
作者： Dapeng Li , Yuelong Chen , Huan Kang , Benyan Xu , Yulong Zhang
DOI: 10.1016/J.LITHOS.2018.07.011
关键词: Continental arc 、 Geology 、 Crust 、 Massif 、 Geochemistry 、 Rodinia 、 Igneous rock 、 Mafic 、 Supercontinent 、 Zircon
摘要: Abstract The Neoproterozoic period is a key geological time in earth history that witnessed the breakup of Rodinia supercontinent. Diancangshan and Ailaoshan Massifs are two major segments along tectonic zone, metamorphic igneous rocks these massifs preserve clues to elucidate on-going dispute over geodynamic drives for break-up Rodinia. Many studies have been performed on Massif, but contemporaneous Massif poorly studied. In this study, zircon U-Pb-Hf isotopic, whole-rock elemental Sr Nd isotopic data presented granitoid suite from Massif. Zircon U Pb dating shows all monzodioritic granitic samples inner part southern yielded crystallization ages 701–797 Ma without exception. One sample collected edge gave intrusive ~239 Ma. Therefore, magmatic activities underestimated, spatial distribution intrusions occupies at least 1/3 whole area Diancagnshan originated mixing magmas generated subduction-modified mantle wedge mafic lower crust. can be subdivided into groups. Group 1 I-type moderate A/CNK values 0.80–1.07, which were derived partial melting 2 strongly peraluminous (A/CNK > 1.1) hybridized source graywacke mafic-derived components. Geochronological, petrological geochemical show magmatism ATZ was prolonged (>80 Ma) continental arc system. An Andean-type orogeny formed NW margin (i.e., Seychelles, Himalaya, Amdo South China including zone) induced regional internal lithospheric extension.
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