Proto-Tethys magmatic evolution along northern Gondwana: Insights from Late Silurian–Middle Devonian A-type magmatism, East Kunlun Orogen, Northern Tibetan Plateau, China

Abstract

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Prospecting Potential of the Yanjingou Gold Deposit in the East Kunlun Orogen, NW China: Evidence from Primary Halo Geochemistry and In Situ Pyrite Thermoelectricity

“…Early Palaeozoic-Mesozoic granitoids (466-390 and 257-200 Ma) are widespread in the EKO [22][23][24]. These granitoids mainly include granodiorites, syenogranites, and monzogranites [25,26] that were formed during the subduction of the Proto-and Palaeo-Tethyan oceanic plates [17,25]. Minor Cambrian-Ordovician mafic-ultramafic rocks (537-467 Ma) occur along the CEKB [27], and the SEKB that have the ages of Carboniferous and Cambrian-Ordovician are 345-332 Ma and 555-516 Ma, respectively [18,28].…”

Tectonomagmatic Setting and Cu-Ni Mineralization Potential of the Gayahedonggou Complex, Northern Qinghai–Tibetan Plateau, China

“…At the end of the late Paleozoic, the Proto-Tethys Ocean completed subduction at approximately 428 Ma, it entered the post-collision extension stage, and slab break-off occurred [5,60]. Some A-type granites with low CaO, MgO, and Sr contents in the EKOB are considered to have formed in the post-collision environment, such as the Nniantang A-type syenogranite (403 ± 2 Ma) [69]. To date, the latest Paleozoic A-type granite reported in the East Kunlun area is the Binggou granite with an age of 391 ± 3 Ma [70].…”

“…These mafic-ultramafic rocks and those of the Gayahedonggou 10a is modified from [47] and Figure 10b is modified from [68]. Some A-type granites with low CaO, MgO, and Sr contents in the EKOB are considered to have formed in the post-collision environment, such as the Nniantang A-type syenogranite (403 ± 2 Ma) [69]. To date, the latest Paleozoic A-type granite reported in the East Kunlun area is the Binggou granite with an age of 391 ± 3 Ma [70].…”

Early Devonian mafic igneous rocks in the East Kunlun Orogen, NW China: Implications for the transition from the Proto- to Paleo-Tethys oceans

“…It is generally accepted that the East Kunlun Orogen (EKO) was a product of the tectonic evolution of the Proto-and Paleo-Tethys oceans (Bian et al, 2004;Chen et al, 2017Chen et al, , 2020Dong et al, 2018a). Based on high-to ultrahigh-pressure (HP-UHP) metamorphic rocks, recent studies have proposed that the collision event between the East Kunlun and Qaidam blocks could represent the final closure of the Proto-Tethys Ocean (Bi et al, 2018;Song et al, 2018).…”

“…However, the Middle Silurian to Middle Devonian evolution of the EKO is controversial; both large scale lithospheric delamination and oceanic slab break-off have been proposed as causes of regional extension (Zhang et al, 2014;Zhong et al, 2017;Xin et al, 2018;Chen et al, 2020). Xiong et al (2014) proposed that the formation of the Paleo-Tethys Ocean started at ~393 Ma, based on within-plate mafic dykes in the EKO, however, the dataset of that study is limited and the early evolution of Paleo-Tethys needs to be re-evaluated.…”