吉林省中部A型花岗岩带的确定及其构造意义

DETERMINATION OF A TYPE GRANITE ZONE IN THE CENTRALPART OF JIL PROVINCE AND ITS SIGNIFICANCE IN TECTONICS

吉林省中部，在伊通—依兰与敦化—密山断裂带之间，北起舒兰红石砬子，循近南北方向，南入蛟河拉法；一支转向永吉—伊通；一支转向敦化青沟子—朱敦店；一支顺永吉—呼兰镇的两侧，即桦甸常山—富太河；磐石红石砬子—新锅盔山；发育了一条空间展布形态独具特色的Ａ型花岗岩带。它形成的时代为２３０Ｍａ左右。这是松（松嫩）—佳（佳木斯）—龙（龙岗）三个地块之间的活动带，从新元古代演化发展，由过渡型陆壳转化为成熟陆壳，结束其“古吉黑造山带”历史的重要标志。

Between Yitong Yilan and Dunhua-Mishan faUlted zones in the central part of Jilinprovince,A-type granite zone with the unique characteristic is distributed as the followingextent,i.e.,from Hongshilazi,Sulan county in the north to Lafa,Jiaohe county in the south;from Yongji to Yitong;from Qinggouzi,Dunhua county to Zhudundian(from Changshan,Huadian county to Futai River);from Hongshilazi,Panshi county to Xinguokuishan. Theforming age is about 230Ma. this belongs to active zone which joins along the Songnen,Jia-musi and Longgang blocks. Since the Proterozoic,the transition-type continental crust hasbeen developed to mature continental crust,forming Paleojihei orogenic belt.