谈早前寒武纪侵入岩定位、变形、变质的同期性

Study on Allocation,Deformation and Metamorphism Contemporaneity of Early Precambrian Intrusives

依据鲁西地区早前寒武纪花岗质侵入岩普遍具有塑性流变特征和退化变质特征，以及变质作用和变形作用相协调等现象，认为岩体的侵位与变形、变质是同一期构造岩浆作用形成的，是岩浆就位后逐渐冷凝过程中，在持续应力作用下发生的，与后期的地质构造作用无关；固态岩石只能发生脆性变形和局部的脆韧性变形。并从热力场、动力场和化学场的变化趋势对变形、变质作用的制约因素作了简要分析。

According to the study on the appearance of early Precambrian granites in west Shandong in plastic flow characteristics,retrograde metamorphism characteristics,and contemporance development of deformation and metamorphism,it is said that the kinds of deformation and metamorphism occurred under continuous stress during magmatic condensation period. They are different reflections of a same period structural magmatism and haven't any relation with late period geological structure activities; and in solid rocks could only happened brittle deformation or partially brittle deformation. Mechanism of deformation and metamorphism has been briefly analyzed according to the variation trend of thermal field, dynamic field and chemical field.