Late Devonian to early Carboniferous roll-back related extension setting for the Tuwu-Yandong porphyry copper metallogenic belt in the Dananhu arc of the eastern Tianshan (NW China) in the southern Altaids

Petrogenesis and geodynamic implications of the Late Devonian dioritic and granitic intrusive rocks in the Dananhu Belt, Eastern Tianshan Orogenic Belt

“…13 B). This estimated pressure is notably higher than that of the A-type granites in the same area which were formed under an extensional tectonic regime [ 9 , 73 ]. In general, the formation pressure conditions of the samples exhibit an intermediate state between the adakites formed by slab melting and the A-type granites with regional extension.…”

“…Zircon saturation temperatures (T Zr ), calculated from bulk rock compositions, provide a minimum estimate of the temperature of the original magma upon emplacement since the granodiorites do not contain inherited zircon [ 71 ]. The T Zr values of the granodiorite samples range from 676 to 721 °C ( Table 2 ), which are notably lower than typical A-type granite (with T Zr values between 839 °C and 764 °C for unfractionated A-type granites [ 71 , 72 ]; and A-type granitoids in the Eastern Tianshan region with T Zr values between 780 °C and 908 °C [ 9 , 73 , 74 ]. In all, these characteristics distinguish them from A-type granites [ 28 , 75 ].…”

“…There are numerous Late Paleozoic magmatic intrusions in the Dananhu belt, and these intrusions exhibit depletion in Nb, Ta, and Ti and positive bulk ε Nd (t) and zircon ε Hf (t) values, suggesting a subduction-related origin [ 8 , 9 , 16 , 45 , 51 , 108 , 109 ]. It is widely accepted that the Kangguer suture belt represents the closure of North Tianshan ocean between the Central Tianshan Block and the Junggar plate [ 37 , 110 ].…”

“…The East Tianshan is located in the southwestern section of the CAOB ( Fig. 1 A), whose genesis is the result of northward subduction of the Kangguer Ocean (the east-extending of the North Tianshan Ocean) [ [7] , [8] , [9] ]. The East Tianshan is characterized by voluminous Paleozoic intermediate to felsic intrusions and volcanic rocks ( Fig.…”

Editorial: Plate subduction and mineralization in East and Central Asia

“…Meanwhile, the crosscutting vein-type ores were likely formed by a Late Ordovician-Silurian magmatic-hydrothermal event genetically linked to North Tianshan Ocean subduction. Led by Paleo-Asian Ocean subduction, the Devonian-Carboniferous is a key metallogenic epoch in Central Asia, generating many world-class porphyry Cu deposits in the Balkhash (e.g., Kounrad and Borly; Kazakhstan), Gurvansayhan (e.g., Oyu Tolgoi; Mongolia) and Chinese Tianshan (Tuwu-Yandong, Xinjiang) regions (e.g., Wainwright et al, 2011;Shen et al, 2017;Mao et al, 2022). Yang et al reported on the newly discovered Qia'erdunbasixi Fe-Cu skarn deposit in the Zarma-Sawur Cu-Au belt (Kazakhstan-NW China).…”