大兴安岭中段早二叠世A型花岗岩成因及对扎兰屯地区构造演化的制约
Genesis of Early Permian A-type granites in the middle of the Great Xing'an Range and constraints on tectonic evolution of the Zhalantun area
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文摘
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本文通过对大兴安岭中段扎兰屯地区早二叠世花岗岩进行岩石学、年代学及地球化学分析,揭示早二叠世花岗岩的成因和构造背景,探讨贺根山-黑河缝合带中段晚古生代构造演化特征。早二叠世花岗岩主要由二长花岗岩和碱长花岗岩组成,形成年龄为289 ~298Ma。样品的高硅、高铝、低P_2O_5 、低CaO、低MgO的岩石地球化学特征及较低的FeO/ MgO比值和低的Ba、Sr、Eu组分,表现出A型花岗岩的岩石地球化学特征;此外,样品的低Sc、Ni、Co、V含量及Nb/ Ta(4.88 ~21.9)和Zr/ Hf比值(8.32 ~29.1)表明研究区早二叠世花岗岩岩浆是壳幔物质混合作用的产物。早二叠世A2型花岗岩形成于伸展环境,说明早二叠世之前兴安地块与松辽地块已完成拼贴,早二叠世期间贺根山-黑河缝合带在扎兰屯地区处于碰撞拼贴以后的后碰撞伸展环境。 |
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其他语种文摘
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Hegenshan-Heihe suture zone is an important boundary in Great Xing'an Range that is located at the eastern segment of Central Asian Orogenic Belt and it is also important for understanding the tectonic evolution of Central Asian Orogenic Belt. Due to lacking of the detailed proof on magmatism, tectonic structure and paleogeography, the tectonic evolution in the middle of Hegenshan-Heihe suture zone is still in debate. The magmatic events in Zhalantun area are an essential clue to study the tectonic evolution of the middle of the Hegenshan-Heihe suture zone. Thereby, this study presents the petrology, geochronology and geochemistry of Permian granites in Zhanlantun area, middle Great Xing'an Range, Northeast China, with the aim of discussing their petrogenesis and tectonic setting, and constraints on tectonic evolution of Hegenshan-Heihe suture. Permian granites are composed of alkali-feldspar granite and monzogranite with the emplacing ages of 289 ~298Ma. All the samples have the high SiO_2, Al_2O_3 contents, and low P_2O_5, CaO, MgO contents and show the low FeO/ MgO ratios and low Ba, Sr, Eu contents, showing the geochemical features of A-type granites. The low Sc, Ni, Co, V contents and ratios of Nb/ Ta (4.88 ~21.9) and Zr/ Hf (8.32 ~29.1) indicate that the magma of Permian granites is the mixing magma between mantle-derived magma and crustal melt. The Permian A2 -type granites were emplaced in extensional setting, indicating that the amalgamation of the Xing'an and Songliao blocks had been finishing before Early Permian. Zhalantun area in middle of Hegenshan-Heihe Suture was in a post collision extensional setting after the amalgamation of the Xing'an and Songliao blocks. |
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来源
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岩石学报
,2020,36(4):1091-1106 【核心库】
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DOI
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10.18654/2095-8927/008
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关键词
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A型花岗岩
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贺根山-黑河缝合带
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松辽地块
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兴安地块
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大兴安岭
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扎兰屯地区
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地址
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1.
山东理工大学资源与环境工程学院, 淄博, 255049
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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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中国海洋大学,海洋高等研究院,海洋地球科学学院, 海底科学与探测技术教育部重点实验室, 青岛, 266100
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青岛海洋科学与技术国家实验室,海洋矿产资源评价与探测技术功能实验室, 青岛海洋科学与技术国家实验室,海洋矿产资源评价与探测技术功能实验室, 青岛, 266237
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自然资源部东北亚矿产资源评价重点实验室, 自然资源部东北亚矿产资源评价重点实验室, 长春, 130061
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0569 |
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学科
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地质学 |
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基金
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国家自然科学基金国家杰出青年科学基金
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国家重点研发计划项目
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山东省泰山学者建设工程专项
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国土资源部中国地质调查局项目
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自然资源部东北亚矿产资源评价重点实验室开放课题基金
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文献收藏号
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CSCD:6753109
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