| 传统填图法在半覆盖区的改进——第四系岩性填图法 |
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| 关键词:classification and nomenclature of Quaternary loose deposits mapping units division horizontal-vertical geological profiling Quaternary petrography-based mapping method partially covered area |
| 基金项目:中国地质调查局地质调查项目(编号: 2010020057)资助 |
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| Quaternary Petrography-based Mapping Method: A Modified Mapping Technique for Mineral Exploration in the Partially Covered Area |
| Mapping units (MU) of Quaternary sediments 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 has been broadly used in the past decades, muddle would occur in the partially covered area because of mixture of the Quaternary sediments of different origins. In this study, the authors developed a new mapping method, named petrography-based Quaternary mapping method (PBQMM), for mineral exploration in the partially covered area with the purpose of avoiding such confusion. In this method, MUs are classified according to petrographic features; as for Quaternary sediments, such factors as 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 sediments of different locations. Like the traditional mapping method, the PBQMM can extract information on distribution and petrography of Quaternary sediments; nevertheless, it can deduce bedrock information, and help enhancing and explaining geochemical anomalies. To get the additional information efficiently, researchers should seek and survey geological profiling revealing Quaternary sediments as well as bedrock. Traditional geological map and deducted bedrock geological map are both needed in the PBQMM so as to express the information correctly. |
| YAO Chun-liang,XIA Qing-lin,ZHANG Xiao-jun,FAN Xian-wang,QIN Ying,TAN Jiang-dong.2017.Quaternary Petrography-based Mapping Method: A Modified Mapping Technique for Mineral Exploration in the Partially Covered Area[J].Acta Geoscientica Sinica,38(4):549-559. |
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