敦化-密山断裂带的平移距离:来自松嫩-张广才岭-佳木斯-兴凯地块古生代-中生代岩浆作用的制约

被引:21
作者
王枫 [1 ,2 ]
许文良 [1 ]
葛文春 [1 ]
杨浩 [1 ]
裴福萍 [1 ]
吴韦 [1 ]
机构
[1] 吉林大学地球科学学院
[2] 同位素地球化学国家重点实验室中国科学院广州地球化学研究所
关键词
敦化-密山断裂带; 兴凯-佳木斯-松嫩-张广才岭地块; 古生代-中生代; 岩浆作用; 同位素年代学; 平移时间; 平移距离;
D O I
暂无
中图分类号
P542 [构造运动];
学科分类号
070904 ;
摘要
敦化-密山断裂带是郯庐断裂北段的重要分支之一,其大规模左行走滑发生的时限以及平移距离一直存在较大争议。本文系统地总结了松嫩-张广才岭地块东缘、佳木斯地块以及兴凯地块之上古生代-中生代火成岩的锆石U-Pb年代学资料,结合其空间分布特征,对敦化-密山断裂带的平移时限及距离提供了制约。研究表明,松嫩-张广才岭地块东缘与兴凯地块在古生代-中生代期间具有类似的岩浆活动历史,两个地块之上该时期的岩浆作用可以划分为8个主要期次:中-晚寒武世(ca.500~516Ma)、早奥陶世(ca.480~486Ma)、晚奥陶世(ca.450~456Ma)、中志留世(ca.426~430Ma)、早二叠世(ca.285~292Ma)、晚二叠世(ca.255~260Ma)、晚三叠世(ca.202~210Ma)和早侏罗世(ca.185~186Ma)。相比之下,佳木斯地块中的古生代-中生代早期岩浆事件则集中在晚寒武世(492Ma)、晚泥盆世(388Ma)、早二叠世(288Ma)、晚二叠世(259Ma)和早侏罗世(176Ma),而晚奥陶世-志留纪和晚三叠世的岩浆活动在佳木斯地块未见报道。早白垩世晚期(ca.105~110Ma)和晚白垩世(ca.90~94Ma)的岩浆活动在三个地块均存在。上述结果表明兴凯地块东缘与松嫩-张广才岭地块东缘在早古生代经历了共同的地质演化历史,而中生代早期,兴凯地块西缘与松嫩-张广才岭地块东缘经历了同样的岩浆作用历史。上述结果暗示,敦化-密山断裂可能经历了至少两次平移,分别发生在中-晚二叠世-早三叠世和中-晚侏罗世-早白垩世,推测其总的平移距离约400km。结合研究区中生代期间的构造演化历史,敦化-密山断裂中生代的左行平移应与中-晚侏罗世-早白垩世期间古太平洋板块(Izanagi板块)的斜向俯冲相联系。
引用
收藏
页码:1129 / 1140
页数:12
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