Evidence for ∼1.8Ga extension of the Eastern Block of the North China Craton from SHRIMP U–Pb dating of mafic dyke swarms in Shandong Province

Paleoproterozoic mafic dyke from Kongling terrain in the Yangtze Craton and its implication

“…This characteristic is also consistent with igneous zircon crystallized from mafic magma. Two zircon grains show relatively low Th/U ratios (<0.1), which have been found in previous studies on mafic dyke [3,43] . The country rock of the mafic dyke is ca.…”

The oldest (ca. 2.51 Ga) rock in South Korea: U-Pb zircon age of a tonalitic migmatite, Daeijak Island, western Gyeonggi massif

“…The widespread tonalite-trondhjemite-granodiorite (TTG) suites in the Hengshan and Fuping complexes, northern China, were dated at 2520-2480 Ma (Kröner et al, 2005). Moreover, in the Taishan tonalite complex, Shandung peninsula, Hou et al (2006) reported a SHRIMP U-Pb age of 2544 ± 24 Ma with a weighted mean 207 Pb/ 206 Pb age of 2523 ± 18 Ma. Similar Neoarchean ages were reported from the Nangrim mas- sif, North Korea (Zhao et al, 2006): two grey gneiss samples yielded SHRIMP U-Pb zircon ages of 2.64-2.54 Ga for magmatic crystallization, and 2.46-2.43 Ga for regional metamorphism.…”

Late Paleoproterozoic rift-related magmatic rocks in the North China Craton: Geological records of rifting in the Columbia supercontinent

“…1b by correlating the Northern Hebei orogen of the NCC with the Volhynia belt of Baltica (Claesson et al, 2001). Hou et al, 2006b;Wang et al, 2007a;Xu et al, 2007;S.H. Zhang et al, 2007;Hou et al, 2008a;Peng et al, 2008;T.P.…”

“…The mafic dyke swarms yield an age range between 1.84 and 1.62 Ga Li et al, 2001;T.P. Zhao et al, 2004b;Wang et al, 2004;Peng et al, 2005Peng et al, , 2006Shao et al, 2005;Hou et al, 2006b;Wang et al, 2007a;Peng, 2010; Table. 1). Volcanic rocks from the Xiong'er Aulacogen in southern part of the NCC show ages of ca.…”

“…Zhao et al, 2001T.P. Zhao et al, , 2004aWang et al, 2004;Peng et al, 2005;Shao et al, 2005;Yang et al, 2005;Hou et al, 2006b;Peng et al, 2006;Han et al, 2007;Xu et al, 2007;S.H. Zhang et al, 2007;He et al, 2009;T.P.…”