The Early Permian active continental margin and crustal growth of the Cathaysia Block: In situ U–Pb, Lu–Hf and O isotope analyses of detrital zircons

Geochemical studies on Permian manganese deposits in Guichi, eastern China: Implications for their origin and formative environments

“…An important source of the manganese in this area probably came from sea-floor volcanism or hydrothermal activity, perhaps associated with syn-sedimentary faults. This is supported by the presence of argillaceous volcanic rock in the Gufeng formation of Permian of the Lower Yangtze area (Kametaka et al, 2005;Xia et al, 1994Xia et al, , 1995Yang and Yao, 2008;Zhu et al, 2012) and Early Permian magmatism in southeastern China coastal region (Li et al, 2012b). Moreover, the extremely high Mn/Fe ratios of Mn ores (>5, up to 39.7; Table 2) are consistent with fractionation of manganese and iron during hydrothermal transport and mineralization (Glasby, 2000).…”

“…Xia et al (1995) once proposed that silicilite of the Permian Gufeng Formation in the Lower Yangtze area was hydrothermal sediment origin, whereas Zeng et al (2004) proposed that cherts of Permian in Tongling region were origin of the consequence of episodic, multi-cycle activities of hydrothermal solution. Li et al (2012b) found the ubiquitous existence of ca 280 Ma detrital zircons in the studied sediments, implying a widespread occurrence of Early Permian magmatic rocks in southeastern China coastal region. The palaeotemperatures of Mn-carbonate samples (49-71°C) were obviously higher than those of Qixia period (35-40°C) in the Lower Yangtze area (Jiang et al, 1994), supporting hydrothermal deposition in the Guichi region, too.…”

Mineralogy and geochemistry of claystones from the Guadalupian–Lopingian boundary at Penglaitan, South China: Insights into the pre-Lopingian geological events

“…262 Ma ages (e.g. Wang et al, 2007;Li et al, 2012). The data are therefore not consistent with the Cathaysia Block as the source of the Penglaitan Group 2 sediments.…”

Provenance of Upper Miocene to Quaternary sediments in the Yinggehai-Song Hong Basin, South China Sea: Evidence from detrital zircon U–Pb ages

“…All but 33 measurements show Th/U 0.10 and another 653 zircons have Th/U ratios ranging from 0.10 to 3.40. These features indicate that the majority of the analyzed zircons are of magmatic origin (Belousova et al, 2002;Corfu et al, 2003;Wu and Zheng, 2004;Li et al, 2012). Zircon grains in all samples have a wide age range from the Archean to Cenozoic, suggestive of a wide range of igneous rock ages in the source areas (Choi et al, 2013).…”