12 – 1 pm

Rm 312.222

Peng Peng

Institute of Geology and Geophysics, Chinese Academy of Sciences

A tale of the North China Craton by Proterozoic mafic dyke swarms

Abstract

The major Proterozoic mafic dyke swarms, as well as rift systems in the North China Craton and their implications for palaeogeography reconstruction and lithospheric evolution will be reviewed based on our systematic investigation. These dyke swarms could be grouped as three: the Middle Paleoproterozoic group (2150 Ma, 2050 Ma, 1970 Ma and 1890 Ma dyke/sill swarms) could implicate for the tectonic subdivision and the forming of the craton; whereas the Late Paleoproterozoic (1780 Ma, 1730 Ma, 1680 Ma and 1620 Ma) and the Early Neoproterozoic (925-890 Ma) groups are potentially important in reconstructing the rifting events and the configuration of the North China Craton in Proterozoic supercontinents. These dyke swarms are also important in understanding the evolution of the sub-continental lithospheric mantle. Our studies tell another story for this 3.8 Ga-old-craton.

Biographical Details

Peng is a professor of petrology and Precambrian geology at Institute of Geology and Geophysics, Chinese Academy of Sciences (Beijing). He is interested in using mafic dyke swarms to reveal the Precambrian lithospheric evolution as well as palaeogeography of particularly the North China Craton.