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Guo L.-T.,Guangdong Seismological Bureau | Wang P.,China Earthquake Administration | Zhang K.,Sun Yat Sen University | Sheng Q.,Guangdong Seismological Bureau | And 2 more authors.
Geology in China | Year: 2013

The dating of the Late Quaternary sediments in the east Pearl River Delta has great significance in many aspects, such as the study of the delta's evolution, the fluctuation of the ancient sea level and fault activities. The OSL and 14C dating was performed for the core from seven drill holes in Dongjiang plain, and sporopollen and micropaleontology analysis was conducted. Different from the former conclusion based mainly on 14C age that the oldest deposit of the delta is less than 40 000 a, the authors' OSL dating demonstrates that the age of the lower strata is about 47 000 to 135 000 a. Based on a preliminary analysis of the age reliability and stratigraphic geochronological framework of the two transgression cycles during the Late Quaternary, the authors hold that the first transgression of the east Pearl River Delta might have occurred 40 000 to 80 000 a ago, and the erosion and weathering effect led to the considerable stratigraphic gap between the two transgressions.

Wang P.,China Earthquake Administration | Guo L.,Guangdong Seismological Bureau | Dong H.,China Geological Survey Wuhan Geological Survey Center | Sheng Q.,Guangdong Seismological Bureau | And 3 more authors.
Acta Petrologica Sinica | Year: 2011

Guang-Cong fault is a significant basement fault trending NE and there exist much debates on the Late Quaternary activity of its buried part in the Pearl River Delta. Recently, geological and geomorphologic survey, trench profiles. Quaternary dating, shallow artificial seismic prospecting and other measures have been used in order to disclose the nature of the Late Quaternary at Xilin Hill, Foshan City, eastside of Guang-Cong fault. The geometry characteristics of Xilin Hill fault and its relation to the bedrock were surveyed and analyzed; the origin of the fault was also discussed. Xilin Hill fault is a palingenetic gravity sliding surface rather than Quaternary active fault and has no relationship with earthquake. So far, there was no geological or geomorphologic evidence for the activity of the Guang-Cong fault since Late Quaternary, therefore, we disagree with the view that the fault has the capacity of triggering violent earthquake.

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