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世界地质 2017, 36(4) 1064-1071 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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| 基础地质 |
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嫩江—黑河晚古生代碰撞过程的岩石构造建造学响应 |
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杨晓平，汪岩，那福超，付俊彧，杨雅军，谭红艳 |
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中国地质调查局 沈阳地质调查中心，沈阳 110034 |
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摘要：
根据嫩江—黑河地区古生代地质体岩石组合特征，恢复原岩建造类型，并在分析岩浆作用、变质作用、构造组合关系及同位素年代学资料基础上，探讨嫩江—黑河晚古生代陆陆碰撞带的形成机制。研究认为，早石炭世兴安地块和松嫩地块开始沿嫩江—黑河一线汇聚拼贴，早石炭世洋陆俯冲阶段形成了岛弧与弧后盆地沉积; 晚石炭世—早二叠世陆陆碰撞过程中形成花岗闪长岩和二长花岗岩侵位; 早二叠世碰撞后伸展阶段形成了中二叠世弧后残余盆地。总体具有从俯冲--碰撞造山向造山后伸展演化的特点。 |
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关键词：
嫩江—黑河地区
晚古生代碰撞
构造建造
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Petrologic-tectonic formation response of Late Paleozoic collision process in Nenjiang--Heihe area |
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YANG Xiao-ping，WANG Yan，NA Fu-chao，FU Jun-yu，YANG Ya-jun，TAN Hong-yan |
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Shenyang Center of Geological Survey，CGS，Shenyang 110034，China |
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Abstract:
According to rock assemblage of Paleozoic geological bodies in Nenjiang--Heihe area，the protolith type are restored. On the basis of the analysis of magmatism，metamorphism，tectonic combination and isotopic geochronology data，the formation mechanism of Late Paleozoic continental collision in Nenjiang--Heihe area has been discussed. The results show that Xing＇an block and the Songnen block began to converge along the Nenjiang --Heihe line in the Early Carboniferous，and the island arc and post-arc basin were formed in the oceanic crust subduction stage. Emplacement of granodiorites and monzogranites occurred during the Late Carboniferous --Early Permian continent-continent collision. Middle Permian back-arc residual basin formed after the Early Permian post-collisional extension. Generally，the evolution history of the study area was characterized by subduction to collisional orogeny， and to post-orogenic extension. |
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Keywords:
Nenjiang--Heihe area
Late Paleozoic collision
Petrologic-tectonic formation response
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