Petrogenesis of Mesozoic granitoids and volcanic rocks in South China: A response to tectonic evolution

Abstract

This paper summarizes the new results on the petrogenesis of Mesozoic granitoids and volcanic rocks in South China. The authors propose that these rocks were formed in time and space as a response to regional tectonic regime change from the continent-continent collision of the Indosinian orogeny within the broad Tethyan orogenic domain in the Early Mesozoic (T 1-T 3) (Period I) to the largely extensional setting as a result of the Yanshanian orogeny genetically associated with the NW-WNW-ward subduction of the paleo-Pacific oceanic lithosphere in the Late Mesozoic (J 2-K 2) (Period II). Of the Period I Indosinian granitoids, the early (T 1-T 2 1) ones are syn-collisional, and formed in a compressional setting; the late (T 2 2-T 3) ones are latecollisional, and formed in a locally extensional environment. During the Period II Yanshanian magmatism, the Early Yanshanian (J 2-J 3) granitoid-volcanic rocks, which are distributed mainly in the Nanling Range and in the interior of the South China tectonic block (SCB), are characteristic of rift-type intraplate magmatism, whereas the Late Yanshanian K 1 granitoid-volcanic rocks are interpreted as genetically representing active continental margin magmatism. The K 2 tholeiitic basalts interlayered with red beds are interpreted as genetically associated with the development of back-arc extensional basins in the interior of the SCB. The Yanshanian granitoid-volcanic rocks are distributed widely in South China, reflecting extensional tectonics within much of the SCB. The extension-induced deep crustal melting and underplating of mantle-derived basaltic melts are suggested as the two principal driving mechanisms for the Yanshanian granitic magmatism in South China.

Geochronological, geochemical and Sr–Nd–Hf isotopic constraints on petrogenesis of Late Mesozoic gabbro–granite complexes on the southeast coast of Fujian, South China: insights into a depleted mantle source region and crust–mantle interactions

“…This force induced slab break-off, finally bringing about the foundering and rollback of the slab (subducted during Late Mesozoic time) in the SCB during Early Cretaceous time (Fig. Qiu, Wang & McInnes, 1999) and the development of a series of fault-bounded basins (Zhou et al 2006b) during Late Cretaceous time. (c) The slab break-off and its rollback to the east caused a strong and rapid rise of asthenospheric mantle below the coastal area of the SCB, resulting in a linear zone of asthenospheric upwelling in the study area (Fig.…”

“…(b) Geological sketch map of the QZ complex in the Quanzhou area (modified from the 1:500 000 geological map of the Fujian Province, FJBGMR, 1998). Lapierre et al 1997;Xu et al 1999;Li, 2000;Zhou & Li, 2000;Zhou & Chen, 2001;Griffin et al 2002;Zhao, Hu & Liu, 2004;Zhou et al 2006b;Zhao et al 2007). Lapierre et al 1997;Xu et al 1999;Li, 2000;Zhou & Li, 2000;Zhou & Chen, 2001;Griffin et al 2002;Zhao, Hu & Liu, 2004;Zhou et al 2006b;Zhao et al 2007).…”

Multiple Emplacement and Exhumation History of the Late Mesozoic Dayunshan‐Mufushan Batholith in Southeast China and Its Tectonic Significance: 2. Magnetic Fabrics and Gravity Survey

“…820 Ma) amalgamation between the Yangtze and Cathaysia blocks along the Jiangnan orogen (for a review, see Wang et al, 2013). As mentioned before, the Late Mesozoic geology of the eastern SCB is featured by widespread magmatism and numerous small rift basins, indicating an overall extensional tectonic regime related to the paleo-Pacific subduction (e.g., J. H. Shu et al, 2009;Wang & Shu, 2012;Zhou & Li, 2000;Zhou et al, 2006). X. Li et al, 2010).…”

“…Y. Wang et al, 2011;Ji, Lin, Faure, Chen, et al, 2017;Jiang et al, 2015;L. Li, Qiu, & Yang, 2014;Zhou & Li, 2000;Zhou et al, 2006). Li, Qiu, & Yang, 2014;Zhou & Li, 2000;Zhou et al, 2006).…”

Geodynamics of paleo‐Pacific plate subduction constrained by the source lithologies of Late Mesozoic basalts in southeastern China

“…(Figures 2-4). Due to the increasing of dip angle for subducted slab induced by the growing gravity [e.g., Niu, 2014], the entire southeastern China was under back-arc extensional setting after 110 Ma [Li and Li, 2007;Lui et al, 2014aLui et al, , 2014bPearce and Stern, 2006;Zhou et al, 2006], and mantle-derived magma in this period shows the principal affinity of asthenospheric mantle again [Meng et al, 2012]. Such material cannot be the ancient recycled crustal components because the carbonated eclogite cannot be preserved in the upper part of upper mantle during ascent based on the solidus of carbonated eclogite [Litasov and Ohtani, 2010] and the average mantle adiabat [Akaogi et al, 1989].…”