Deformation characteristics and formation mechanism of the Yunmengshan metamorphic core complex

The Yunmengshan metamorphic core complex in the middle part of the Yanshan Fold and Thrust Belt records crust extension processes of the eastern North China Craton during its peak destruction.Development of the metamorphic core complex was controlled by the generally NNE-striking Dashuiyu Shear Zone.The shear zone dips SE and becomes shallower NE-wards,leading to exposures of a ductile shear zone in the southern and middle parts and brittle faults in the northern part.Exposure structures,microstructures,and quartz C-axis fabrics indicate that the ductile shear zone belongs to an extensional shear zone with a top-to-the-SE shear sense.Deformation temperatures of 300–520°C suggest a midcrustal origin for the ductile shear zone.A ductile deformation belt in the footwall of the shear zone is only as wide as 1–3 km,indicating no widespread mid-crustal ductile flow in the region during the deformation.Zircon U–Pb dating of dykes and plutons as well as hornblende and biotite40Ar/39Ar dating demonstrate that the metamorphic core complex originated at 135 Ma and experienced intense shearing of the Dashuiyu Shear Zone,development of the supradetachment basins,and synkinematic intrusion during 135–125 Ma.The metamorphic core complex was subjected to rapid exhumation during 125–114 Ma when the Dashuiyu Shear Zone suffered continuous activity and passive doming.The shear zone and its hanging wall were cut or replaced by a series of brittle faults when they wereuplifted to a brittle regime,showing that exhumation took place in continuous extensional activities.The metamorphic core complex turned into slow exhumation in an extensional regime in the following latest Early Cretaceous.The evolution history suggests that the Yunmengshan metamorphic core complex was developed by the rolling-hinge model,a common formation mechanism for intraplate metamorphic core complexes in the North China Craton,under the continuous NW–SE extension during the Early Cretaceous(135–100 Ma).     

熊耳山地区滑脱拆离带的脆韧性转换机制

河南熊耳山地区的滑脱拆离带由浅部到深部为一脆性—脆韧性—韧性的断裂带．浅部盖层由于未遭受高温热液变质作用，所受围压和孔隙压力较小，表现为脆性变形；深部基底遭受了强烈的高温热液变质作用，岩石中赋存汽水流体较多，所受围压也较大，表现为韧性变形；而位于盖层与基底之间的拆离断层则由于高孔隙压力作用降低了部分围压效应，使之位于盖层与基底之间的拆离断层产生了脆韧性变形．这样在不同围压、流体、孔隙压力和高温热液变质作用等因素及构造应力的共同作用下，实现了本地区滑脱拆离带的脆韧性转换     

某公路变质砂岩深路堑边坡加固设计探讨

变质砂岩为软岩，强度较低，节理裂隙十分发育，耐风化能力弱，且风化程度较深，由变质砂岩组成的深路堑边坡防护问题一直为重难点问题。本文依托安徽皖南山区某拟建公路项目，对典型变质砂岩深路堑边坡稳定性进行分析，采用赤平投影分析和极限平衡法等分析方法，分析边坡破坏模式，并对边坡开挖过程中、防护前后的稳定性系数进行计算，评价边坡加固方案的合理性。     

磨齿烧伤和裂纹及其变质层深度

磨齿烧伤和裂纹是影响齿轮质量的关键。通过对磨削烧伤的种类和原因进行了较为详细的分析,针对锥面砂轮磨齿机磨齿特点,找出影响变质层深度的主要因素。采用回归设计方法,通过试验找出齿面变质层深度与各工艺参数间的关系式。这对于分析磨削烧伤等磨削缺陷是有意义的。     

水平气液两相变擀分层流动模型

由于水平井筒和常规水平管道中气液两相流动的相似和差别,可以预知常规水平管流的流型转变机理及压降计算方法,对于井筒流动来说就需要进行修正或扩展,根据气液两相界面波的迅速成长机理,考虑了管壁入流或出流的影响,得到水平井筒气流两 质量流动分层流向非分层流流型转变的判别方法,并对气、液两相分别应用质量守恒方和动量守恒方程,考虑管壁存在入流或出流对于分层流流型压降的影响,得到水平井筒气液两相变质量流动分层汉流的压降计算方法。     

带有价格折扣的变质物品的最优订货策略

本文给出了单一变质物品的存储模型,并求出此时的最优订货策略;并研究了两种价格折扣时的情况,得出了在这两种情况下的带有价格折扣的存储模型的最优订货策略。     

品读天柱山

天柱山,位于安徽省西南部潜山县境内,汉时曾封为南岳,是一处以花岗岩地质地貌、超高压变质带为主要特征的国家地质公园,面积135.12平方千米,园区最高峰天柱峰海拔1488.4米。     

浅谈煤各变质类型及变质作用

本文主要介绍煤变质的主要类型,根据受热的主要热源及作用方式和煤质特征等,不同的影响因素划分不同的煤变质作用类型。总结概括为深成变质作用、岩浆热变质作用、动力变质作用和热水变质作用,阐述了煤变质作用的特点。     

辽南万福变质核杂岩韧性剪切带的应变与剪切作用类型

辽南万福变质核杂岩韧性剪切带为一走向近SN,倾向NE的低角度韧性剪切带,带内的主要岩石类型为花岗质糜棱岩。以长石为应变标志体的Rf/φ应变测量显示应变类型为压扁应变;以极莫尔圆与长短轴法的运动学涡度估算表面,剪切带的剪切作用类型为以简单剪切为主的一般剪切。结合区域构造演化与年代学资料,认为辽南万福变质核杂岩韧性剪切带形成于加厚地壳造山后垮塌,且在早白垩纪华北克拉通大规模地壳伸展的联合作用下由地壳的中、深层次被抬升至地表,并与各时代的岩石在同一露头上并置而成。