运用火山地质学理论研究竹田头火山机构

系采用火山活动旋回-火山构造-火山地层-岩性、岩相一体化思路对浙东谷来地区的竹田头复活破火山机构进行地质填图的一些认识,主要有如下五点:1.采用火山旋回-火山构造-火山地层-岩性、岩相一体化思路在火山岩区进行地质填图,取得了很好的地质效果;2.区域火山地层层序的厘定,首先应在同一旋回的火山机构内,测制剖面,厘定火山地层层序,而后把不同旋回火山机构内的地层层序叠置,建立区域综合地层层序,在此基础上,确定岩石地层单位和填图单元;3.划分岩相,建立相序,是推演古火山演化历史,建立演化模式的有效途径;4.线形构造与环形火山构造组合形成的线-环构造格局,是火山岩区地质构造的重要特征;5.在火山岩区用火山地层组-段-岩性填制的地质图,实质上是一种实际材料图,只有以火山旋回-火山构造-火山地层-岩相为内容的火山岩相构造图,才能正确反映火山岩区的地质构造特点,揭示火山岩的成因,追溯古火山演化历史,恢复古火山面貌.

The study on revived caldera using volcanology

The Zhutiantou revived caldera,Gulai,east Zhejiang,were mapped by volcanic active cycle-volcanic structure-volcanic stratigraphy-rock facies and lithology to get five conclusions:1.This methods is good for geological mapping in volcanic area to get better results;2.The stratigraphical units and mapping units were determined by determining volcanic mechanism section in the same cycle and overlapping sequences with different cycles;3.Dividing facies and setting up sequence are useful to infer the evolutions of old volcano and the patten of the evolutions;4.line-ring structure pattern is a important feature in volcanic rocks area;5.The geological maps mapped before by volcanic stratigraphy formation-stage-lithology are reality material maps.Only volcanic structure-facies map mapped by volcanic cycle-volcanic structure-volcanic stratigraphy-rock facies reflects exactly structure feature of volcanies area and the origin of volcanics and evolution of old volcanos to revive old volcanos.