河北涞源─八达岭岩基段单元－超单元特征及其成因

CHARACTERISTICS AND GENESIS OF UNIT-SUPERUNITS ABOUT MEMBER OF LAIYUAN-BADALING BATHOLITH, HEBEI PROVINCE

涞源－八达岭地区花岗岩类是华北地区中生代燕山期岩浆侵入活动的典型代表，它对研究中国东部乃至亚洲东部地壳的形成、发展、演化都具有重要意义．本文从花岗岩类单元－起单元入手，对涞源－八达岭岩基段进行了划分，探讨了单元－超单元的主要特征，指出本岩基段是在太平洋板块俯冲机制下走滑造山作用的结果，岩浆来源于下地壳未经地表地质作用的深变质火山岩的部分熔融，并有地幔衍生岩浆的混合。

he granites in Laiyuan-Badaling area are the typical representative of magmatic intrusion of Yanshan stage in Mesozoic era in North China and are of important significance for the study of the formation, development and evolution of the crust in the east part of China, even in the east part of Asia. Basing on the study about the unit-superunits of granites, the authors divide the member of Laiyuan-Badaling batholith, discuss the main characteristics of the unit-superunits, and point out that this member of batholith is the result of strike-slip mountain-making under the mechanism of Pacific plate, magma comes from the part melting of the hypometamorphic volcanic rocks under the lower crust that did not suffer surface geological funcation,and this magma was mixed with derived magma of mantle.