伊舒断裂带年代学新证据  

New evidences of chronology of rift belt of Yitong-Shulan

作　　者：殷长建[1] 彭玉鲸[1] 王彦生[1] 李睿[1] 陈跃军[1] 

机构地区：[1]吉林省区域地质矿产调查所,吉林长春130022

出　　处：《吉林地质》2005年第1期6-15,共10页Jilin Geology

摘　　要：2001年我们首次在伊通—舒兰断裂带上的乐山镇达子沟获得压碎中细粒黑云母二长花岗岩中黑云母单矿物40Ar/39Ar坪年龄133.13±0.31Ma,等时线年龄133.37±0.60Ma;在靠山镇北口获得中细粒碎裂白云母/二云母花岗白云母单矿物40Ar/39Ar坪年龄135.66±0.11Ma,等时线年龄135.43±0.26Ma。恰恰与伊泽纳吉(Izanagi)大洋板块在135～127Ma间、以30.0cm/a,高速率向东亚大陆边缘作俯冲的运动历史相耦合,反映东亚大陆边缘与东部泛太平洋板块,在该地质时期具有共同的、统一的深部地球动力学过程。并据此讨论和概括了伊通—舒兰断裂带中侏罗世—古近纪构造性质发生多次转化的复杂演化历史。The plateau age of^(40)Ar/^(39)Ar of monomineral biotite was determined for the first time in the Yitong-Shulan rift belt, which is 133.13±0.31Ma, and its isochronal dating is 133.37±0.60Ma; the plateau age of^(40)Ar/^(39)Ar of monomineral muscovite in the press-broken mid-fine muscovite was determined at the Beikou, Kaoshan Town, which is 135.66 0.11Ma, and its isochronal dating is 135.43±0.26Ma.It is just identical with the fact that ocean plate divided to eastern Asia plate by high-speed 30.0cm/y between 135~127Ma, pointed out by Izanagi. It shows that continental margin of eastern Asia with general Pacific Ocean Plate, in this geological period, had a common and unified dynamitic process in depth. Based on it, we discussed and resumed that complicated evolution history that tectonic feature occurred polydefom in rift belt of the Yitong-Shulan in middle Jurassic epoch-Eocene system.

关 键 词：断裂带 ^40AR/^39AR 年代学 等时线年龄 证据 大陆边缘 二长花岗岩 2001年 太平洋板块 动力学过程 大洋板块 地质时期 演化历史 多次转化 构造性质 中侏罗世 单矿物 黑云母 白云母 高速率 古近纪 细粒 东亚 俯冲 地球 

分 类 号：P542.3[天文地球—构造地质学] P318.44[天文地球—地质学]