Implications from zircon-saturation temperatures and lithological assemblages for Early Permian thermal anomaly in northwest China

Petrogenesis and geodynamic implications of the Late Carboniferous felsic volcanics in the Bogda belt, Chinese Northern Tianshan

“…5, 11) (Si et al, 2014). The calculated zircon saturation temperatures (T Zr = 792-842°C) were also in the overlapped field of typical A-type and I-type granitoids (King et al, 1997;Zhong and Xu, 2009;Liu et al, 2013). In fact, the Late Carboniferous felsic rocks in the Chinese Tianshan Orogenic Belts often belong to I-type (Zhu et al, 2009;Tang et al, 2010;Tong et al, 2010;Liu et al, 2013;Tang et al, 2014;Zhang et al, 2015), whereas the Early Permian felsic rocks are mainly A-type granitoids (Tang et al, 2010;Yuan et al, 2010;Zhang and Zou, 2013;N.-B.…”

“…The Permian Tarim Plume was considered to have extended to the western Tarim Table 1. Zhou et al, 2009;Xu et al, 2014) and may affect the Tianshan Orogen, which may explain the extensive Early Permian thermal anomalies and high-temperature A 2 -type granitoids and Cu-Ni-bearing maficultramafic intrusion in this region (e.g., Pirajno et al, 2008;Qin et al, 2011;Liu et al, 2013;Zhang and Zou, 2013).~300 Ma kimberlitic intrusions and Fe-Ti oxide-bearing mafic layered intrusion (He et al, 2016) in the southwest part of the Tianshan Orogen was attributed to the beginning of the Tarim Plume at the end of Carboniferous Xu et al, 2014;He et al, 2016). Devonian OIB-like mafic magmatism and ocean plate stratigraphy might even imply that the plume magmatism was active in the southern Tianshan Ocean in Devonian (Safonova et al, 2016).…”

“…Zircon saturation temperature is a useful parameter in petrogenetic evaluation. The combined geological and geochemical approaches represent a simple and powerful way to illuminate important issues of magma genesis, and then to define their tectonic setting (e.g., Watson and Harrison, 1983;Miller et al, 2003;Liu et al, 2013). We collected and compared the Late Carboniferous-Early Permian felsic rocks with reliable zircon U-Pb ages in this region (see Table 1 and Fig.…”

The Early Permian Tarim Large Igneous Province: Main characteristics and a plume incubation model

“…When combined with other geological and geochemical evidence, these represent a way of constraining the processes of magma genesis, and by inference their tectonic setting . Liu et al (2013) examined zircon saturation temperatures of granitoids emplaced in different settings, and showed that zircon saturation thermometry of felsic igneous rocks emplaced in LIP setting are higher than those generated in subduction-and collision-related settings. The Early Permian granitoids and rhyolites from the Tarim Basin have zircon saturation temperatures ranging from 800 to 950°C, comparable with those obtained for plume-generated LIPs (Fig.…”

High-alumina basalts from the Bogda Mountains suggest an arc setting for Chinese Northern Tianshan during the Late Carboniferous

“…However, this "stitching pluton" shows a wide SiO 2 range (58-74%) with a metaluminous I-type affinity (Si et al, 2014). In addition, they have restricted zircon saturation temperature (T Zr = 792-842°C) in the overlapping region of the typical A-type granite and I-type granite (King et al, 1997;Liu et al, 2013;Zhong and Xu, 2009). In fact, most of Late Carboniferous felsic rocks in the Chinese Tianshan Orogenic Belts belong to I-type granitoids (Liu et al, 2013;Tang et al, 2010Tang et al, , 2014Tong et al, 2010;Yan et al, 2013;Zhang et al, 2015;Zhu et al, 2009).…”