Geochemical constraints on the tectonic environment of the Late Paleoproterozoic mafic dyke swarms in the North China Craton

Paleoproterozoic reworking of ancient crust in the Cathaysia Block, South China: Evidence from zircon trace elements, U-Pb and Lu-Hf isotopes

“…This would mark the beginning of break-up of the Columbia supercontinent. 1.9-1.8 Ga arc-continent collisional magmatism in the Yangtze Block is contemporaneous with the 1.86 Ga magmatism of this study [42] and widespread 1.85-1.70 Ga mafic dyke swarms, aulacogens and anorogenic magmatic rocks in the North China Craton are also considered to be responses to the break-up of the Columbia supercontinent [71][72][73][74][75][76][77][78][79] .…”

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

“…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. Zhao et al, 2009;Peng, 2010;Hou, 2012).…”

“…Zhao et al (2002a,b), Xu et al (2007), He et al (2008He et al ( , 2010b, Peng et al (2008), Wang et al (2010); Dyke swarm: T.P. , Peng et al (2004Peng et al ( , 2007Peng et al ( , 2008, Wang et al (2004Wang et al ( , 2007aWang et al ( , 2008, Hou et al (2008a), Cui et al (2011). seen that the lavas and dykes show a distinct trend (Fig. 12) with one end-member pointing to the FOZO and another end-member pointing to the EM1 component, representing either ancient pelagic sediments or old cratonic lithospheric mantle (Hart et al, 1992;Hofmann, 1997;Zhang et al, 2008).…”

Mechanism for three types of mafic dyke swarms

“…In the Late Paleoproterozoic, the North China Craton was characterized by extensional structures such as aulacogens and mafic dyke swarms. The NNW-trending mafic dyke swarms were emplaced in the central portion of the craton and also among the aulacogens or rifts including the Yanliao Aulacogen, Zhongtiao Aulacogen, Baiyunerbo-Artai Rift, Helan Rift and Jinshan Aulacogen Hou et al, 2008a) (Fig. 2).…”