摘要
本文论述中国东部中－新生代由科迪勒拉型转变为西太平洋活动大陆边缘过程中的构造－岩浆作用及其演化。在印支旋回（２５０～１８５Ｍａ），初始欧亚板块与古太平洋板块强烈挤压俯冲，并伴随大范围改造型花岗岩类的发育。在燕山早期（１８５～１４０Ｍａ），继续俯冲，改造型花岗岩进一步发育，并开始有同熔型花岗岩类的形成。在约１４０Ｍａ两类花岗岩的形成达到高潮。在１４０～１００Ｍａ广泛发育安山－流纹岩系。燕山晚期（１００～７０Ｍａ）由于弧后扩张，配合红色盆地的广泛形成，发育碱性火山岩和碱性花岗岩带．新生代中国东部大陆花岗岩和中－酸性火山岩活动消失，代之以玄武岩活动；边缘海和岛弧逐渐形成，钙碱性火山岩系转入岛弧地带。
This paper deals with the relationships between plate tectonics and magmatism and the transition of the Cordillera-type margin into Western Paicfic-type active continental margin of East China in Mesozoic and Cenozoic.In the Indo-Chinese cycle(T-J,250～185Ma) the two gigantic plates,initial Eurasian and paleo-Pacific plate,began their intense compression and subduction,which led to the formation of eclogite belts,regional metamorphism,orogeny,and many transformation-type granitoids and small amount syntexis-type granitoids without important volcanism.In the Early Yanshanian Period (J2-3,185～140Ma) further subductian between the initial Eurasian plate and paleo-Pacific plate brought East China gradually on active continental margin.Many transfomation-type granitoids,moderate amount of syntexis-type granitoids and volcanic rocks related to A-type and B-type subduction of plates,slabs and terranes were formed during this period.In the Middie Yanshanian period(K2,140～100Ma) the East China was situatedon a cordillera-type active continental margin.At the beginning of this period(140Ma) andesiterhyolite and some shoshonite volcanism and granitoid-diorite magmatism reached their peak.The Late Yanshanian period(K1,100～70Ma) represents the beginning of the transition period from the Cordillera-type(trench-arc system) to the western Pacific active continental margin(trench-arc-backarc basin system).At the East Conment of China andesiterhyolite volcanism, transformation-type and syntexis-type granitoid intrusion gradually extincted. Weakly-alkaline and alkaline volcanic rocks, alkaline granite and syenite with nonorogenic characteristics were formed along the deep fault zones. All of these magmatic rocks were vanished at the end of the Late Cretaceous.Many intercontinental basins formed in tension setting filled with red beds were distributed widespreadely in East China.During the Cenozoic time (E, N, Q, 70Ma to present) almost all of the granitoids and intermediate-acid volcanic rocks were extincted at the east cont
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第4期370-381,共12页
Acta Petrologica Sinica
关键词
大陆边缘
活动构造
岩浆作用
演化
Tectonics evolution
Magmatism evolution
Active continental margin
Mesozoic
Cenozoic
East China
