利用趋势面分析粒度等值线图圈定火山喷发中心——以福建福清凤迹火山机构为例

APPLICATIONS OF GRAIN SIZE CONTOURS CONSTRUCTED BY USE OF TREND SURFACE ANALYSIS IN THE DELINEATION OF VOLCANIC ERUPTION CENTERS——EVIDENCE FROM THE DELINEATION OF THE FENGJI VOLCANIC EDIFICE IN FUQING, FUJIAN

摘要: 从火山岩区地质填图角度出发,本文提出了一种方法——粒度分布的趋势面分析。主要有下列步骤:测取各点标准粒度,将其填于一张 250m×250m网度的网上,用计算机进行二次和五次趋势分析,并画出两张等粒线图。对其可行性进行讨论,确定出基本可靠的中心式火山机构的位置。

Abstract: From the angle of geological mapping of volcanic terrains, the paper pro- poses a method-the trend surface analysis of grain size distribution. The main steps are as follows: measure the standard grain sizes at various points and fill in them on a grid of 250×250m, perform quadratic and quintic trend surface analyses using the computer and construct two grain size contour maps. The feasibility of the method is discussed here, and evidence of the delineation of a central-type volcanic edifice is obtained.