|Abstract:Mapping units (MU) of Quaternary materials generally used now in regional geological survey are genesis-MUs in nature for they are classified according to depositing process. Though the genesis-MU method is broadly used in the past decades, muddledness would be made in the partially covered area because of mixture of the Quaternary materials of different origin. We developed a new mapping method, named petrography-based Quaternary mapping method (PBQMM), during mineral exploration in the partially covered area to avoid this confusion. In the method, MUs are classified according to petrographic feature, as for Quaternary materials, shape, size, and content of gravel-size fragments are the key elements referred. Based on these elements, base type and integrated name can be determined to distinguish Quaternary materials of different location.
Like the traditional mapping method, the PBQMM can extract information on distribution and petrography of Quaternary materials, but unlikely, it can deduce bedrock information, and help enhancing and explaining geochemical anomalies, etc. To get that additional information efficiently, geological profiling revealing Quaternary materials as well as bedrock should be seek and surveyed. To express the information mentioned above correctly, traditional geological map and deducted bedrock geological map are both needed in the PBQMM.