%0 Journal Article
%T A Link of measurements of lava flows to Palaeoelevation estimations and its application in Tengchong volcanic eruptive field in Yunnan Province(SW China)<br>火山"熔岩流气泡古高度计"及其在云南腾冲火山区的应用
%A GUO ZhengFu
%A ZHANG MaoLiang
%A CHENG ZhiHui
%A LIU JiaQi
%A ZHANG LiHong
%A LI XiaoHui
%A <br>郭正府
%A 张茂亮
%A 成智慧
%A 刘嘉麒
%A 张丽红
%A 李晓惠
%J 岩石学报
%D 2011
%I 
%X Based on measurements of thickness of lava flow and sizes of the vesicles at the top and the bottom of the lava flow, the palaeoelevation of Heikongshan lava flow emplacement in Tengchong volcanic eruptive field (SW China) at the Holocene times may be calculated by a relation of the palaeoatmospheric pressure with vesicle sizes in the lava flow. The lava flow, which could be used as paleoelevation calculations in Tengchong, had to merely undergo a simple and clearly recognized history from eruption, cooling to emplacement without inflation and deflation based on the observations and analyses in the field works during 2009~2010AD. In theory, the best fit thickness for the lava flow to the calculations of palaeopressure and then palaeoelevation is about 3m, which could produce one bar of palaeoatmospheric pressure at its top and two bars of total pressure at its bottom. In fact, the basaltic flows with 1~5m in thickness have been used as candidates for the calculations of palaeoelevation in the Heikongshan lava flows of Tengchong volcanic eruptive field (SW China). Unlike the measurements of the thickness of lava flow in the field work, sizes of the vesicles at the top and the bottom of the lava flow could be merely determined in the laboratory, the most accurate technique of which is 3D X-ray Tomography in situ. We have carried out the analysis of the sizes of the vesicles at the top and the bottom of the Heikongshan lava flows by microscope observations, based on a conversion from 2D to 3D by calculations. The final calculation results have indicated that palaeoelevation of the Heikongshan lava flow is about 1713~2613m. On the basis of comparison between actual and calculation elevations, our calculated results could be accepted. Outcrops of the post-collisional most primitive lava flows are widely distributed across the Tibetan Plateau including its interior and margins; there are more than 50 sites of the Cenozoic volcanic eruptive fields in the plateau. Most importantly, two active volcanoes erupted basaltic lava flows in 1951AD and 1609AD, which is located in the NW and SE of the plateau, respectively. It will be expected to shed light on the uplift history of the Tibetan Plateau by combining of the technique with geodynamic setting analysis.
%K Palaeoelevation
%K Volumes of modal bubble sizes
%K Uplift of the Tibetan Plateau
%K Tengchong volcanic eruptive field in Yunnan Province (SW China)<br>古高程
%K 体积众数
%K 青藏高原隆升
%K 腾冲火山区
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=B0A3094CBEF84E9161A7F90B5F5D0991&yid=9377ED8094509821&vid=DB817633AA4F79B9&iid=F3090AE9B60B7ED1&sid=4EC239D69006C6CE&eid=29EF3FA9A2182B88&journal_id=1000-0569&journal_name=岩石学报&referenced_num=2&reference_num=29