Metamorphic evolution and 40Ar/39Ar geochronology of the Wuguan complex, eastern Qinling area, China: Implications for the late Paleozoic tectonic evolution of the Qinling orogen

Sedimentological Evidence for Pre‐Early Permian Continental Subduction in the Dabie Orogen, Central‐East China

“…Our conclusions are supported by other geochronological data from the scattered medium‐high grade Permian metamorphic bedrock, and limited paleomagnetic and provenance data, including: (a) c. 260–300 Ma 40 Ar/ 39 Ar ages from the Dabie‐Sulu orogen which are interpreted to record tectonothermal events associated with early continental collision and subduction (c. 265 Ma muscovite 40 Ar/ 39 Ar ages from low‐grade schists in the Sulu orogen, J.‐B. Zhou et al., 2008; c. 261–279 Ma muscovite 40 Ar/ 39 Ar ages from the Xinyang–Beihuaiyang unit on the northern margin of the Dabie orogen, Hacker et al., 2000; Ratschbacher et al., 2003, 2006; c. 300 Ma illite K‐Ar and illite‐whole rock Rb‐Sr isochron ages from low greenschist facies (epizonal) slates, Zhu et al., 1994); (b) Early‐Middle Permian (c. 258–297 Ma) garnet Lu‐Hf, apatite and zircon U‐Pb dates from (U)HP eclogite‐facies rocks in the Dabie orogen (Brouwer et al., 2011; H. Cheng & Cao, 2015; H. Cheng et al., 2009, 2016, 2018; Shi et al., 2022; K. Sun et al., 2022) that may record prograde metamorphism associated with continental subduction; (c) a Permian (c. 250–270 Ma) medium‐pressure, amphibolite‐facies metamorphic belt that supposedly extended for over 500 km in the Qinling‐Tongbai‐Hong'an‐Dabie orogen and interpreted to be related to Permian initial continental collision between the SCB‐NCC (L. Chen et al., 2014, 2020); (d) detrital metamorphic zircon of Permian age (280 Ma, n = 12) in the Lower Cretaceous of the Jiaolai Basin to the north of the Sulu Orogen (L. X. Zhang et al., 2021); (e) comparable regional medium‐to high‐pressure metamorphism in the eastern continuation of the Dabie‐Sulu orogen in South Korea (the Ogcheon metamorphic belt), which initiated as early as the Early Permian (281–291 Ma) and peaked in the Triassic (c. 225 to 255 Ma) (Cheong et al., 2003; D.‐L. Cho et al., 2008; M. Cho & Kim, 2005); (f) paleomagnetic results that show that the easternmost NCC and SCB were juxtaposed during the Middle Permian (c. 270 Ma) (X. Zhao & Coe, 1987); (g) various disparate lines of evidence that indicate initial continental subduction could have initiated in the Early Permian including c. 258–300 Ma geochronological ages recording metamorphism and rapid cooling, the Permian sedimentary facies distribution in the SCB, and Permian thrusting events on the southeastern NCC (Li, 1998).…”

“…Cheng et al, , 2018Shi et al, 2022;K. Sun et al, 2022) that may record prograde metamorphism associated with continental subduction; (c) a Permian (c. 250-270 Ma) medium-pressure, amphibolite-facies metamorphic belt that supposedly extended for over 500 km in the Qinling-Tongbai-Hong'an-Dabie orogen and interpreted to be related to Permian initial continental collision between the SCB-NCC (L. Chen et al, 2014Chen et al, , 2020; (d) detrital metamorphic zircon of Permian age (280 Ma, n = 12) in the Lower Cretaceous of the Jiaolai Basin to the north of the Sulu Orogen (L. X. Zhang et al, 2021); (e) comparable regional medium-to high-pressure metamorphism in the eastern continuation of the Dabie-Sulu orogen in South Korea (the Ogcheon metamorphic belt), which initiated as early as the Early Permian (281-291 Ma) and peaked in the Triassic (c. 225 to 255 Ma) (Cheong et al, 2003;D.-L. Cho et al, 2008;M.…”

Tonian and Cryogenian 40Ar/39Ar hornblende and muscovite ages for the São Gabriel Terrane, Dom Feliciano Belt, southern Brazil

“…40 Ar/ 39 Ar analyses are an important tool to date metamorphic and also igneous events (Dickin, 2018;Faure & Mensing, 2005;Schaen et al, 2020). When these analyses are integrated with the rock's fabric, it is possible to improve discussions in deformation ages, nature of the protolith, thermal event ages in metamorphic belts (Chen, Liu, Qu, & Hu, 2020;Sorokin et al, 2018), or crystallization age in volcanic rocks, cooling ages of plutonic suites, and even the magmatism spanning igneous associations (Lu et al, 2018;Schalteger et al, 2019;Schmitt, Emmermann, Trumbull, Buhn, & Henjes-Kunst, 2000).…”