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| Main Progress and Achievements in 1:50 000 Regional Geological Survey of Houjiexu, Xiaolanzhen, Rongqizhen, Taipingzhen Regions,Guangdong Province |
| XIE Ye-cai, ZHUANG Wen-ming, HE Xiang, HUANG Xue-fei, LONG Gui, SHANG Jian-lin |
| (Guangdong Geological Survey Institute, Guangzhou 510080， China) |
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Abstract The proportion of shallow overburden area by Quaternary sediments in regional geological survey projects of 1:50 000 Houjiexu, Xiaolanzhen, Rongqizhen, Taipingzhen sheets has risen to 71%. Basing on previous achievements on regional geological survey, and combing with integrated method of route geological survey,geophysical prospecting, remote sensing, geological drilling and detailed study of Quaternary sediments, the transgressive sequence and stratigraphic framework of the Pearl River delta have been established since Late Pleistocene 128 ka (MIS 5) in past three years. The susceptibility change law of sediment core provides evidences for stratigraphic correlation and sedimentary cycle division as well as basic data in Quaternary research of the Pearl River delta. The spatial extensions and activities of buried NE and NW trending main faults were found out which provided basic data for civil engineering construction, earthquake preparedness and disaster reduction. The SHRIMP dating technique is applied to determine U-Pb ages of zircons from monzogranites, the result suggests that Late Jurassic granitic magmatism formed in post-collisional extensional environment, Late Jurassic and Indosinian granitic magmatism coexisted in the study area.
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