Ordovician graptolite-bearing strata in southern Jiangxi with a special reference to the Kwangsian Orogeny

Geochronological and geochemical constraints on the petrogenesis of Middle Paleozoic (Kwangsian) massive granites in the eastern South China Block

“…However, it is uncertain whether the rift evolved to form the early Paleozoic Huanan Ocean between the Yangtze and Cathaysia Blocks (e.g., Chen et al, 2006;Li et al, 2010b;Liu and Xu, 1994;Ma et al, 2004;Shu et al, 2008bShu et al, , 2008cWang et al, 2007cWang et al, , 2010Wang et al, , 2011. The lines of evidence show that the Neoproterozoic-lower Paleozoic sequences to the east of the Anhua-Luocheng Fault were commonly folded by the Kwangsian (middle Ordovician-Silurian) orogenesis, This is particularly represented by the presence of the angular unconformity between the lower and upper Paleozoic sequences and extensive granitic magmatism to the east of the Anhua-Luocheng Fault (e.g., Chen et al, 2010;Fujian BGMR, 1985;Hunan BGMR, 1988;Jiangxi BGMR, 1984;Ting, 1929;Wang et al, 2010).…”

“…The contemporaneous A-type granites and alkaline rocks are also absent in the eastern SCB. Further evidences against an early Paleozoic Huanan Ocean between the Cathaysia and Yangtze Blocks includes: (1) a continuous biostratigraphical and paleoecological evolution system from the Yangtze to Cathaysia Blocks suggests a continuous linkage between the two blocks (e.g., Chen et al, 2010;Liu and Xu, 1994;Rong et al, 2002Rong et al, , 2007; (2) the lower Paleozoic strata exhibits a complete sedimentary phase transition from a slope/neritic siliciclastic, through an interstratified carbonate-siliciclastic, to a shallow-water carbonate-dominated succession from the Cathaysia to eastern and central Yangtze (e.g., Li et al, 2010a;Wang et al, 2010); and (3) detrital zircon grains (n> 900) from the lower Paleozoic sandstones in the Yangtze and Cathaysia Blocks have documented the similar age peaks of 2560Ma,~1850 Ma,~1000 Ma and 890-760 Ma (e.g., Wang et al, 2010.…”

“…It underwent three major tectonic events after its formation, namely the Kwangsian (middle Paleozoic), Indosinian (Triassic) and Yanshanian (Jurassic-Cretaceous) events (e.g., Chen, 1999;Chen et al, 2010;Haynes, 1988;Li, 1998;Li and Li, 2007;Ren, 1991;Shu, 2006;Shu et al, 1991Shu et al, , 2008aWang et al, 2002Wang et al, , 2005Wang et al, , 2007bWang et al, ,c, 2008Wang et al, , 2010Wang et al, , 2011Zhang et al, 2011a). Extensive granites formed in response to these events and occurred to the east of the AnhuaLuocheng Fault (Fig.…”

Kwangsian and Indosinian reworking of the eastern South China Block: Constraints on zircon U–Pb geochronology and metamorphism of amphibolites and granulites

“…In fact, Ting (1929) originally proposed the "Kwangsian movement" or "Kwangsian orogeny" to name the middle Paleozoic event in China based on the presence of the unconformity between early and late Paleozoic sequences. Chen et al (2010) and Wang et al (2010Wang et al ( , 2011 recently advocated the reuse of the "Kwangsian orogeny" to distinguish it from the Caledonia event of Europe. The Triassic event was initially defined as the Indosinian movement based on the observation of the angular unconformities in the Triassic strata of the Indochina Block in Vietnam (e.g., Deprat, 1914;Fromagat, 1932), which was then extensively used to name the Triassic orogeny in the SCB (e.g., Hunan BGMR, 1988;Jiangxi BGMR, 1984).…”

A regional tectonic event of Katian (Late Ordovician) age across three major blocks of China

“…This term was not, however, commonly adopted by Chinese geologists and later the tectonic movement was referred to by a more popular term, the Caledonian Movement, as suggested by the late professor Huang [2]. In recent years, we conducted an intensive study of aspects of the Kwangsian Orogeny [3][4][5] and were able to constrain the timing of its onset and stages in South China [6]. On the basis of this study, we further recognized a contemporary tectonic event in North China and Tarim, though in different magnitudes and time durations.…”