| 黑龙江科洛杂岩变形特征、阶段和意义 |
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| 引用本文： | 赵衡,张进,王艳楠,张北航.黑龙江科洛杂岩变形特征、阶段和意义[J].大地构造与成矿学,2017,41(4):617-637. |
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| 作者姓名： | 赵衡 张进 王艳楠 张北航 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037;2. 中国科学院新疆生态与地理研究所,新疆乌鲁木齐,830011 |
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| 基金项目： | 国家重点基础研究发展计划,中国地质调查局项目 |
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| 摘 要： | 兴蒙造山区东段的科洛地区,自古亚洲洋关闭之后,经历了复杂的多阶段陆内变形,每一期变形都具有不同的机制,均是中国东北中生代以来板块边缘重要构造事件的反映。三叠纪中晚期,科洛杂岩经历了上盘指向NNE方向的韧性挤压变形,相关变形分布在整个科洛杂岩地区,大量低角度石英拉伸线理以及A型褶皱枢纽均指示了松嫩地块NNE向的运动,科洛杂岩也在此时形成。科洛杂岩并不是松嫩地块的基底,而是中生代构造事件的变质产物,该期事件不是古亚洲洋关闭后的造山带伸展,而与来自东侧和南侧的挤压有关。晚侏罗世-早白垩世科洛地区左行韧性走滑是蒙古-鄂霍茨克洋的关闭所致,其变形集中在科洛杂岩的西部边界剪切带上。白垩纪时科洛杂岩受到伸展构造的改造,以一系列向南东倒伏、走向NNE-SSW的相似褶皱为特征,褶皱的倒伏向不随位置的变化而改变,其伸展不是典型的变质核杂岩。新生代科洛杂岩又受到了近SN向的挤压,发生区域性的宽缓褶皱变形。
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| 关 键 词： | 科洛杂岩 晚三叠世 陆内变形 古亚洲洋 松嫩地块 |
The Deformation Features,Phases and Significance of Keluo Complex in Nenjiang Area,Heilongjiang Province |
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| ZHAO Heng,ZHANG Jin,WANG Yannan,ZHANG Beihang.The Deformation Features,Phases and Significance of Keluo Complex in Nenjiang Area,Heilongjiang Province[J].Geotectonica et Metallogenia,2017,41(4):617-637. |
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| Authors: | ZHAO Heng ZHANG Jin WANG Yannan ZHANG Beihang |
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| Abstract: | Keluo complex, located in the eastern part of the Great Xing'an Range, has undergone multistage and complicated intraplate deformation events after the closure of the Paleoasian Ocean. Each phase of the deformation has different mechanisms, reflecting various plate marginal tectonic events after the Mesozoic in NE China. In the Late Triassic, Keluo complex experienced the top-to-the NNE pervasive ductile compression. Both nearly horizontal quartz stretching lineations and hinges of "A" type folds indicated that the Songnen block moved to the NNE and the complex formed at the same time. So the complex formed during the Mesozoic tectonic event rather than the basement of the Songnen block. This event was not the post-orogenic extension related to the closure of Paleoasian Ocean, but was related to the southern and eastern compression on the Songnen Block. During the Late Jurassic to Early Cretaceous, a phase of sinistral ductile shearing was triggered by the closure of the Mongolia?Okhotsk Ocean. The strain concentrated in the western border of the complex. In the Cretaceous, Keluo complex was superposed by an extension deformation event, yielding a series of similar folds whose strike is NNE-SSW with the axial surface inclined to the SE. The deformation type suggested that it was not a typical metamorphic core complex. In the Cenozoic, Keluo complex was influenced by the S-N trending compression, broad and gentle regional folds were formed. |
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| Keywords: | Keluo complex Late Triassic intraplate deformation Paleoasian Ocean Songnen block |
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