嫩江黑河构造带收缩与伸展——源自晚古生代花岗岩类的地球化学证据

doi:10.13278/j.cnki.jjuese.201502104

摘要/Abstract

摘要：

黑龙江省嫩江至黑河一带发育大量的晚古生代花岗岩类岩石,同位素测年结果显示主要集中在3个时代:早石炭世、晚石炭世和早二叠世。岩石类型从花岗闪长岩-二长花岗岩-正长花岗岩-碱长花岗岩等均有不同出露,石炭纪部分岩石遭受韧性剪切变质变形作用改造形成花岗质糜棱岩。岩石整体具有高硅、富钾钠特征;稀土元素总量偏高,铕负异常明显;微量元素具明显的大离子亲石元素(LILE)K、Rb、Th富集和高场强元素(HFSE)Nb、P、Ti亏损特征。其中石炭纪花岗岩类地球化学特征显示陆缘弧及同碰撞花岗岩特点,二叠纪花岗岩则表现后造山花岗岩特点。二者反映了由碰撞造山向板内后造山阶段转变的构造环境特点,也反映了嫩江-黑河构造带汇聚拼合与伸展的活动史。

关键词: 花岗岩类, 地球化学, 晚古生代, 嫩江-黑河构造带

Abstract:

We present the geochemical characteristics of the Late Paleozoic granitoid in Heilongjiang Nenjiang-Heihe through the study on the different types of granitoid. The isotopic dating results provide three time periods for these granitoids: Early Carboniferous,Late Carboniferous, and Early Permian.The granitoids are rich in silica, potassium, and sodium;and also the rare-earth elements relatively with significant negative Eu anomaly. The trace elements are typically rich in large ion lithophile element (LILE)K, Rb, Th, but poor with high-field-strength element (HFSE) Nb, P, Ti. The existence of granitic mylonite reflects its deformation and metamorphism through tuctile shear. Based on the above, the Carboniferous granitoid experienced a continental margi arc syn-collision; while the Permian granites deformed under a post-orogenesis These two reflects anenvironmental transition from a tectonic collision to an intraplate post-orgenesis, and also the activity history of genesis, convergece, andextension of the Nenjiang-Heihe tectonic belt.

Key words: granitoid, geochemistry, Late Paleozoic, Nenjiang-Heihe tectonic belt

中图分类号:

P588.12

汪岩, 付俊彧, 杨帆, 那福超, 陈会军, 张昱, 杨晓平, 张铁安. 嫩江黑河构造带收缩与伸展——源自晚古生代花岗岩类的地球化学证据[J]. 吉林大学学报(地球科学版), 2015, 45(2): 374-388.

Wang Yan, Fu Junyu, Yang Fan, Na Fuchao, Chen Huijun, Zhang Yu, Yang Xiaoping, Zhang Tiean. Contraction and Extension in Nenjiang-Heihe Tectonic Belt: Evidence from the Late Paleozoic Granitoid Geochemistry[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(2): 374-388.

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