DEVONIAN PALAEOGEOGRAPHY IN GUANGDONG

The Devonian palaeogeography in Guangdong was governed dominantly by NE- and EW-trending ultracrustal deep faults which resulted from compressional faulting at the end of the Caledonian and NW—SE- and NS-trending extensional faulting. The faulting cited above commanded not only the boundaries of uplifts and depressions, but also the temporal and spatial distribution of sedi-mentary facies belts as well as post-Devonian folding, faulting, magmatic activity and regional mineralization. The overall palaeogeographic outline was characterized by the framework with higher relief and shallower water depth in the east and south, and conversely n the west and north. The Devonian transgressions originated from the southwest and northwest, and the early and late stages of the Late Devonian represented maximum marine incursion and regression phases, respectively. The principal source of sediments lay to the Wuyi ancient land in the northeast and Southeast Guangdong ancient land(part of the Cathaysia)in the southeast on the basis of rock and mineral analysis, oblique bedding and gravel vector analysis.