Χ射线激发的光释光测年技术实验研究

】文章提出了利用Χ射线作光释光测年的激发光源，以此进行了实验研究。研究结果表明，利用Χ射线是可以激发辐射样品使其产生光释光信号的     

Influence of olivine grains on K-Ar dating of Late-Cenozoic olivine basalts in eastern China

Five Late-Cenozoic olivine basalt samples, taken from 3 young volcanoes (Keluo, Lianhuashan and Qinglongshan) located in the north of Heilongjian Province, were dated by the conventional K-Ar dating method. The apparent ages of whole rock are (0. 06 ±0. 01) Ma, (0.15 ±0.03) Ma, (0.17 ±0.02) Ma, (21.10 ±0.13) Ma and (24.46 ±0.10) Ma, respectively. In the crushed sample grains (mush number 80–100) olivine (including phynocryst and xenocryst)was picked out under a binocular microscope, then apparent ages obtained are (0.03 ±0.01) Ma, (0.06 ±0.01) Ma, (0.07 ±0.03) Ma, (2.31 ±0.02) Ma and (1.50 ±0.21) Ma, respectively. The apparent ages of the o-livine-picked out sample are come down (younger) 50% to over 90%. There are a lot of the Late-Cenozoic volcanic olivine basalt outcropping in eastern China, probably the age-datings of those basalt samples in which olivine grains are unpicked out are older than the true geological ages. The inference and conclusion drawn from those datings should be renewed.     

大学英语教学与中学英语教学衔接浅谈

大学英语教学与中学英语教学存在明显区别，但又有千丝万缕的联系。从大学英语教学与中学英语教学的差异入手，提出“四清四知三坚持”做好大学英语教学与中学英语教学的衔接，从而实现英语教学的层级递进。     

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).     

贵州一石笋TIMS--铀系定年及其古气候研究

通过对贵州七星洞ZFQX1石笋进行TIMS--铀系定年及其生长率分析,获得了距今43.02-1 2.65 ka的古气候信息.该石笋反映了此阶段贵州地区经历了暖湿--冷干--暖湿的气候演变趋势,这与全球古气候变化波动基本一致,同时也具有地区性的气候特点.     

鄂东南大冶地区中生代火山岩时代及意义

文中通过应用SHRIMP锆石微区U-Pb测年技术对马架山组凝灰岩进行了精确测年,判定其形成时代为早白垩世（123.6 Ma）,与长江中下游地区其他火山岩盆地形成时代类似.通过邻区对比,认为白垩纪长江中下游地区处于伸展构造背景.     

冀北赤城红旗营子群黑云斜长片麻岩的黑云母~(40)Ar/~(39)Ar年龄及其地质意义

探讨冀北赤城红旗营子群是否经历了印支期的构造热事件。通过对冀北赤城红旗营子群黑云斜长片麻岩样品进行的黑云母40 Ar/39 Ar年龄测定,获得其坪年龄和等时线年龄分别为(238.63±1.44)Ma和(238.77±1.71)Ma,两者基本一致。此年龄数据是黑云斜长片麻岩在晚古生代角闪岩相区域变质作用之后所经历印支期构造热事件的记录。综合分析冀北岩浆作用及其地质年代学特征,认为它可能与区域上同时期的酸性岩浆活动有关,是后者为此次构造热事件提供了必要的热源。     

Reservoir-forming age and its exploration significance to stratigraphic reservoirs in southern Songliao Basin

Despite many studies concerning the forming age, evolution characteristics and the age of petroleum charging in the Fuxin upheaval of southern Songliao Basin, no consensus has been reached so far. This paper presents the first K-Ar dating of autogenetic illite from stratigraphic petroleum reservoirs in the Fuyu oil layer of the Fuxin upheaval belt. Isotopic test and age calculation were carried out based on the separation and purification of illite mineral, X-diffraction analysis and the detection of scanning electron microscopy. The evolution characteristics of structure, sedimentation, reservoir-forming about the Fuxin upheaval belt were interpreted in terms of the synthetical analysis of "six-type geological history" evolution in southern Songliao Basin. The geologic background of petroleum evolution and reservoir formation are similar in the entire central depression region of southern Songliao Basin. The Changling sag and the Fuxin upheaval belt brought about obvious upheaval-sag separation after the hydrocarbon-generation peak of K2qn1 and the main reservoir-forming period of the Fuyu oil layer, namely reservoir-forming happened before the Fuxin upheaval belt extensively raised. The reservoirs have three characteristics: the hydrocarbon source rock above the reservoir, the oil source in the lo- cality, and the vertical migration. The geological cognition is corrected, that is, oil source came from the Changling sag and migrated from the side direction. The bulk process of petroleum charging in the stratigraphic hydrocarbon reservoirs in the Fuxin upheaval belt of southern Songliao Basin is deter- mined according to the isotopic age of autogenetic illite in combination with the method of fluid inclu- sions. The cognition is helpful to exactly evaluate the resource potential and exploration direction in the Fuxin upheaval belt, Changling sag and their peripheral areas. The present results indicate that the combination of the two methods (the K-Ar dating of autogenetic illite and fluid inclusions) is an effec- tive way to lay bare petroleum charging history and ascertain reservoir age.     

Paleomagnetic dating of the topmost terrace in Kouma,Henan and its indication to the Yellow River''''s running through Sanmen Gorges

How did the Yellow River develop and evolve? Whendid it form? The geoscientists have concerned these im-portant questions for a long time. They have done a lot ofresearches on these issues and gotten a lot of valuableresults, while there are still many controversies. In general,it mainly includes several points as follows. According tothe transition of the fluviolacustrine strata, biological fos-sils and geologic structure in Lanzhou and Yinchuan, Linmade a conclusion that the Yellow River…     

商纣王的年代学研究——夏商周断代探索之二

商王征伐人方在十祀（１０年），联系３件其铜，证明帝辛（即商纣）十祀在公元前１１５４年或１０９２年。构建帝辛历谱的初步框架。