谱系填图法及其在苏州花岗岩区调中的实施效果

花岗岩类谱系填图法的指导思想,是从解体大岩基入手,建立同源岩浆演化的等级体制及其与岩石地层单位的对应关系,逐步实现按地质构造背景划分花岗岩的区划.该方法在苏州西部地区的区调工作中获得了较好的成效.从丰富多姿的侵入接触关系,建立了该区花岗岩的谱系,论证了主体花岗岩的产状是向北缓倾的岩席,进而,探讨了控岩构造和侵位机制.阐述了花岗岩与矿产的时空关系,并用热力驱动成矿说(HHP理论)解释了苏州各类高岭土矿的成因.

PEDIGREE MAPPING AND ITS APPLICATION IN SUZHOU'S GRANITE AREA SURVEY

A brief review was made to pedigree mapping method, inclouing the background on which it has been developed and the present slate. It's principle is to set up a grading system of cognate magma evolution and corresponding relation with rock-stratigraphy unit by decomposing large rock base, making classification of granite according to their gco-tectonic backgrounds. Emplacing mechanism of granite magma and special property of ore-forming for each unit arc cmhasized. A good result has been obtained for experimental regional survey to type-A granite in western Suzhou. There arc totally 4 sequences and 13 units. Data show the major granite body (Type-A) is a sheet in north dirction, slightly dipping, dominated by tensional crack formed by imbricate thrust fault while the stress changed. The spacial and timcporal relationship between the ores and the granite has been dis-cussed. The genesis for each kaolinitc clay ore in the upper wall of type-A granite body is explained by theory of thermal drive ore-forming.