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| 大兴安岭北段嘎拉山伸展滑脱构造 | |
| 引用本文： | 刘勃然,李伟,贾杰,李伟民,梁琛岳,温泉波.大兴安岭北段嘎拉山伸展滑脱构造[J].吉林大学学报(地球科学版),2014,44(4):1142. |
| 作者姓名： | 刘勃然 李伟 贾杰 李伟民 梁琛岳 温泉波 |
| 作者单位： | 1.中国地质大学（北京）地球科学与资源学院，北京100083； 2.中国国土资源航空物探遥感中心，北京100083； 3.吉林大学中日联谊医院,长春130033； 4.吉林大学地球科学学院，长春130061 |
| 基金项目： | 国家“973”计划项目（2013CB429802） |
| 摘 要： | 嘎拉山大型伸展滑脱构造发育在大兴安岭北段东坡，带内发育倾向SE的剪切面理，普遍发育层间揉皱、眼球状构造、低角度正断层、鞘褶皱和窗棂构造以及云母鱼、旋转残斑、石英条带等各种韧性变形显微组构，变形温度为300～400 ℃。各种宏观和微观不对称褶皱和线理等指向标志显示嘎拉山伸展构造为一指向SE的伸展滑脱构造。通过对剪切变形带中的花岗质片麻岩和大理岩的白云母40Ar/39Ar同位素测年获得144～147 Ma的坪年龄,该年龄代表了伸展剪切变形的形成时间。结合区域上变质核杂岩的研究,认为嘎拉山伸展构造的形成机制很可能与鄂霍茨克造山运动使地壳加厚崩塌，导致大兴安岭地区发生区域性伸展有关。 |
| 关 键 词： | 大兴安岭 嘎拉山 伸展滑脱 40Ar/39Ar测年 |
| 收稿时间： | 2014-03-28 |
Extensional Detachment Structure in Galashan,Northern Great Xing’an Ranges,NE China |
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| Liu Boran,Li Wei,Jia Jie,Li Weimin,Liang Chenyue,Wen Quanbo.Extensional Detachment Structure in Galashan,Northern Great Xing’an Ranges,NE China[J].Journal of Jilin Unviersity:Earth Science Edition,2014,44(4):1142. | |
| Authors: | Liu Boran Li Wei Jia Jie Li Weimin Liang Chenyue Wen Quanbo |
| Institution: | 1.School of Earth Sciences and Resources, China University of Geosciences，Beijing100083,China； 2.China Aero Geophysical Survey & Remote Sensing Center for Land and Resources，Beijing100083,China； 3.China Japan Union Hospital,Jilin University,Changchun130033,China； 4.College of Earth Sciences, Jilin University，Changchun130061,China |
| Abstract: | The Galashan extensional detachment structure is located in the east slope of northern Great Xing’an Ranges. There develop SE-dipping foliation, interlayer fold, augen structure, low-angle normal fault, sheath fold and rodding structures, as well as various ductile deformation micro-textures, such as mica fish, rotated porphyroblast and quartz ribbon in the extensional detachment belt. The temperature of the ductile deformation is about 300-400 ℃. The asymmetric interlayer folds and lineations indicate a large-scale top to SE extensional detachment structure. The 40Ar/39Ar dating of the muscovite from the granitic gneiss and marble within the deformation zone gives 144-147 Ma age, which represents the ductile deformation age of the extensional detachment. Combined with the regional metamorphic core complex data, we suggest that the formation of Galashan extensional detachment structure should be related to the post-orogenic collapse of the thickened crust due to Mongo-Okhotsk orogeny, which resulted in the regional extension in the Great Xing’an Ranges area. |
| Keywords: | Great Xing’an Ranges Galashan extensional detachment 40Ar/39Ar dating |
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