The formation of Dawengquan maar volcano of Longgang volcanic cluster of China

Thursday, 2 February 2017
Marina/Gretel (Hobart Function and Conference Centre)
Bo Zhao1, Zhengquan Chen1, Jiandong Xu1, Zhida Bai2 and Debin Xu1, (1)Institute of Geology, China Earthquake Administration, Beijing, China, (2)China University of Geosciences Beijing, Beijing, China
Abstract:
Longgang volcano cluster (LGVC) is one of typical monogenetic volcanic fields of Quaternary in China (Wei etal.,1999). Volcanic activities started in Neogene, and got its peak in Pleistocene (Liu,1997; Liu, 1999; Fan etal., 2002; Bai etal., 2006). Dawengquan(DWQ) has been considered to be the Holocene maar volcanoes (Liu, 1999; Bai etal., 2006) . The previous studies have shown that there is a dispute about the age of DWQ. The formation of DWQ is still not well understood.

Through strata investigation and grain-size distribution, the eruption sequences in DWQ are phreato erupiton, strombolian eruption and Hawaiia eruption. A carbonized tree was firstly found through scoria and base-surge deposits with a 14C age of 15400±50 BP by beta lab in the east of DWQ. The discovery shows that the base-surge deposits were formed in the late Pleistocene.

The results of 14C test offer a good independent correlation date for the age limitation of clay in the maar lakes of LGVC.

Fig 1 a, Location of LVC and Cenozoic volcanic rocks in Northeast China (Intergrated and changed after Liu etal., 1997 and Geology map in China); b, DEM map of LVC and distributions of maar volcano; c, location of DWQ and XDDZ


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