Abstract
Carboniferous back-arc extension in the southern Yili-Central Tianshan Block and its significance to the formation of the Kazakhstan Orocline: insights from the Wusun Mountain volcanic belt
Highlights
Accretionary orogens form at intraoceanic and active continental margins due to the subduction of oceanic plates (Cawood et al 2009)
Identifying back-arc extension, understanding its magmatic activity and tectonic evolution can help explain the type of the accretionary orogeny that might develop
Our results argue against the original definition of the “Late Carboniferous” Yishijilike Formation (XBGMR 1993), but constrain their eruption in late Early Carboniferous to Late Carboniferous timed
Summary
Accretionary orogens form at intraoceanic and active continental margins due to the subduction of oceanic plates (Cawood et al 2009). The North Tianshan Belt is a Late Paleozoic accretionary complex related to the subduction of the Junggar oceanic plate It mainly contains Devonian-Carboniferous volcanic rocks, turbidites and ophiolitic mélanges (Gao et al 1998; Li et al 2014). Tianshan Block, such as in the Borohoro Mountain Range, Keguqin Mountain Range, Tulasu Basin, Awulale Range, Wusun Mountain Range, and the Haerk and Nalati Mountain Range (Fig. 2) These volcanic strata mainly consist of basalt, trachy-andesite, andesite, dacite, rhyolite, pyroclastic rocks and intercalated with minor sandstones, conglomerates and limestones (An et al 2013; Su et al 2018; Tang et al 2013; Wang et al 2007b; XBGMR 1993; Zhu et al 2009). The dacite-porphyry crops out as dikes that intruded the bimodal volcanic rocks, and exhibits a porphyritic texture with 20 vol% plagioclase as well as 10 vol% quartz phenocrysts, and its cryptocrystalline groundmass contains magnetite (15%) (Fig. 4k, n). The black star indicates the sample locality from Su et al (2018)
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