吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (4): 1135-1153.doi: 10.13278/j.cnki.jjuese.20170022
赵希林1, 姜杨1, 邢光福1, 于胜尧2, 彭银彪2, 黄文成1, 王存智1, 靳国栋1
Zhao Xilin1, Jiang Yang1, Xing Guangfu1, Yu Shengyao2, Peng Yinbiao2, Huang Wencheng1, Wang Cunzhi1, Jin Guodong1
摘要: 华夏地块与扬子地块的拼合时限与方式长期存在争议。本文对出露于浙江诸暨一带的原"陈蔡岩群"进行了详细的露头尺度解剖。野外地质调查表明,原"陈蔡岩群"主要由不同性质的外来岩块与基质组成。其中:代表外来岩块的大理岩及斜长角闪岩的变质年龄分别为(424.7±2.9)和(420.6±1.8)Ma,成岩年龄分别为(479.2±9.5)~(424.7±2.9)Ma和(507.7±7.8)~(420.6±1.8)Ma,斜长角闪岩原岩为具OIB(洋岛玄武岩)特征的碱性玄武岩,大理岩的原岩为海相碳酸盐岩,二者共同构成了洋岛海山组合。代表原地岩块的变长石石英砂岩主要物源区为3 620~1 530 Ma形成于活动大陆边缘和大陆岛弧环境下的古老地壳物质;与之构造混杂接触的斜长角闪岩变质年龄为(438.0±2.5)Ma,其原岩分别为形成于消减带岛弧环境的岛弧拉斑玄武岩、形成于俯冲环境下的富Nb玄武岩和洋岛海山环境下的具OIB特征的碱性玄武岩类。代表基质的含榴黑云斜长片麻岩LA-MC-ICP-MS锆石U-Pb年龄测试结果表明,其变质年龄为(441.0±3.0)Ma,碎屑206Pb/238U年龄多数为840~780 Ma,反映其物源主要来自于新元古代,且最年轻的沉积年龄限定在598 Ma,说明片麻岩原岩可能为早古生代沉积地层。陈蔡地区该套岩石组合的发现表明,原"陈蔡岩群"的构造属性应为早古生代俯冲增生杂岩。结合测区及龙游地区新发现的加里东期麻粒岩和退变榴闪岩,提出扬子与华夏两大地块碰撞于445~420 Ma。
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