U–Pb ages and Hf–O isotopes of zircons from Late Paleozoic mafic–ultramafic units in the southern Central Asian Orogenic Belt: Tectonic implications and evidence for an Early-Permian mantle plume

An Early Permian (ca. 280Ma) silicic igneous province in the Alxa Block, NW China: A magmatic flare-up triggered by a mantle-plume?

“…Early Permian igneous rocks are widely distributed in NW China (e.g., Qin et al, 2011;Su et al, 2011;Xia et al, 2012;Xu et al, 2013;Zou, 2013a, 2013b;Zhang et al, 2010), including the Tarim, Tianshan and CAOB, and constitute a large igneous province referred to as the Tarim or the Tianshan. A mantle plume has been invoked to explain the characteristics of these rocks (e.g., Qin et al, 2011;Su et al, 2011;Xu et al, 2013;Zhang et al, 2010;Zhou et al, 2004), e.g., widely distributed basaltic rocks (e.g., Zhang et al, 2010), extremely high magma temperatures estimated to be in the range of 1100-1600°C , and widely distributed mafic-ultramafic complexes (e.g., Qin et al, 2011). The Early Permian mantle plume was recently proposed to be situated closer to the Beishan Rift than the Eastern Tianshan and the western Tarim (Su et al, 2012).…”

“…280 Ma) igneous rocks with predominantly ultramafic-mafic rocks are widespread in the Tarim Craton and the Central Asian Orogenic Belt (CAOB) (e.g., Li et al, 2011;Wei et al, 2014;Xia et al, 2012;Xu et al, 2013;Yang et al, 2007Yang et al, , 2013Zhang et al, 2010;Zhou et al, 2004Zhou et al, , 2009, and correspond to the Tarim LIP (e.g., Qin et al, 2011;Su et al, 2011Su et al, , 2012. Recent dating of rocks on the Alxa Block, adjacent to the Tarim Craton and the CAOB, reveals that a large area of Early Permian (ca.…”

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

“…This magmatic distribution pattern is consistent with a plume scenario underneath the Tarim and CAOB (Wei et al, 2014;Zhang et al, 2010a, b). (b) Paleozoic mafic-ultramafic associations and granitoids in southern CAOB show a salient temporal variation in Hf-O isotopes of zircon (Su et al, 2011 Whalen et al (1987) and Pearce et al (1984). Data source is the same as in Supplementary Table 1. (c) The Early Permian thermal anomaly is consistent with ultrahightemperature metamorphism in the Erqis shearing fault zone (Hu et al, 2006;Li et al, 2010).…”

“…However, considerable debates were raised recently focusing on tectonics of southern CAOB during Early Permian (Han et al, 1997(Han et al, , 2011Xiao et al, 2009). Available models that interpret deep dynamic process during Early Permian include continuous southward accretion between Siberia and Tarim block (Xiao et al, 2009), post-collisional collapse under extensional environment (Han et al, 1997(Han et al, , 2011 and plume activity in northern Xinjiang (Borisenko et al, 2006;Pirajno et al, 2008;Su et al, 2011;Zhang et al, 2010a,b;Zhou et al, 2004).…”

Late Paleozoic calc-alkaline to shoshonitic magmatism and its geodynamic implications, Yuximolegai area, western Tianshan, Xinjiang

“…The tectonic setting of this region in the Late Paleozoic 6996 6511 5485 7649 6635 8913 8120 6291 7010 5234 5816 6934 6582 8590 5217 267 259 223 274 280 371 340 258 283 249 250 312 342 265 147 219 237 129 248 248 BA BA BA KTA KTA KTA KTA KTA KTA KTA KTA KTA KTA YX2-3 YX2-7 YX3-3 YX08-2 YX08K-1 BST08-1 BST08-2 BST08-3 BST08-4 BST-6 BST-6B BST-11 ALSB-1 ALSB- is still debated. Some researchers suggest that the Carboniferous and Permian magmatic activity in the western Tianshan reflects intraplate magmatism (Che et al, 1996;Xia et al, 2002;Xia et al, 2004;Zuo et al, 2008;Su et al, 2011). Others propose that magmatic activity in the Carboniferous was subduction-related, whereas only the Permian magmatism was intraplate (Jiang et al, 1995;Jiang et al, 1996;Chen et al, 2004a,b;Zhu et al, 2006a,b;Gao et al, 2009;Zhu et al, 2009;Ren et al, 2011).…”