黑龙江省双桦煤田地磁异常与煤层变质程度关系研究

在对本区航磁资料电算处理的基础上，论述了磁异常特征与断裂和隐伏岩体的分布规律，及磁异常区与煤变质特征的分布关系，对本区煤系地层中城子河组煤层变质规律进行了预测。     

40Ar-39Ar ages of the Louzidian-Dachengzi ductile shear zone near Chifeng,Inner Mongolia and their tectonic significance

The Louzidian normal fault occurs as the eastern detachment fault of the Kalaqin metamorphic core complex. Field observations and microstructural analyses reveal that the Louzidian-Dachengzi ductile shear zone developed in its lower-plate was genetically related to sinistral strike-slips and extensional faulting. Two samples from this ductile shear zone yield 40Ar-39Ar plateau ages of 133 Ma (Bi) and 126 Ma (Kp), which are concordant with their isochron ages. The plateau age of 133 Ma (Bi) records the formation age of the ductile shear zone. The inconsistent relationship between the earlier strike-slip ductile shear zone and the later normal fault makes the Kalaqin Quasi-metamorphic core complex distinctive from Cordilleran metamorphic core complex. These ages provide important geochronological data for putting constraints on the formation age and genesis of such ductile shear zones.     

河南桐柏银洞坡金矿床成因矿物学研究

本文采用野外矿床地质调查及室内近代岩矿测试方法,研究矿床中的金银矿及与其密切共生的主要含金硫化物——黄铁矿、闪锌矿、方铝矿的标型特征,并运用自编的电算程序,计算了这些矿物的主要结晶学参数。通过分析对比,获得了一些层控火山沉积中低温变质热液型金矿的成因信息。     

安徽香泉铊矿床地质特征研究

文章对安徽和县香泉铊矿床的地质特征进行了研究,确定了矿床的围岩为奥陶纪红花园组微晶灰岩和微晶白云岩,矿化受断裂和硅化角砾岩带控制,主要蚀变矿化类型有重晶石化、萤石化、硅化、褐铁矿化以及铊矿化。矿床中铊含量很高,w(Tl)最高可达0.23%,铊在矿床中主要以独立的含铊矿物和分散状态2种形式产出,此研究成果为日后该矿床的进一步研究奠定了基础。     

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).     

新疆北山地区金矿床(点)成矿特征

新疆北山地区金矿床（点）为中低温浅成矿床，其矿化类型有准绿片岩型、破碎蚀变岩型、基性侵入体边缘含金石英脉型、浅变质含碳碎屑岩型，并具多期次矿化特征；同时，金矿床（点）受控于逆冲推覆前缘叠瓦断层带。