火山构造组合研究和填图方法应用——以西藏措麦—邦多地区火山岩为例

以125万邦多区幅、措麦区幅火山岩区野外地质调查为基础,运用岩石地层-火山岩相-火山构造法一体化研究思路,吸收20世纪90年代以来国内外对火山学研究的新成果,并借鉴15万区域地质调查中大比例火山地质图编制的经验,从单个火山机构调查扩展到火山机构组合研究,从而填制出火山构造面貌清楚的古火山地质图,全面地反映了不同时期(旋回)火山作用特点、演化规律及火山岩相的分布特征,合理地建立起火山地层层序.

The research and mapping of volcanic associations: An example from the volcanic rocks in the Comai-Boindoi zone,Xizang

The present paper is base on the field geological investigation of the volcanic rocks within the extent of the 1:250 000 Boindoi and Comai Sheets in Xizang according to the combination of lithostratigraphy-volcanic facies -volcanic structures,referenced to the new results from volcanology at home and abroad since 1990''s of last century,and the recent experience from the large-scale geological mapping during the 1:50 000 regional geological survey. The study begins from a single volcano to volcanic associations. The resultant palaeovolcanic geological maps are well-defined in volcanic structures,and may reflect the features of volcanic activities during various stages (cycles) and evolution and distribution of volcanic facies,and reasonably reconstruct the volcanic stratigraphic sequences.