Characteristics of the Two Types of Granits at Sikongshan in the Eastern Part of the Dabieshan Mountains

It has been shown from petrologic,geochemical,trace element and REE evidence that the gran-ite intrusions at Sikongshan,Anhui Province,can be assigned to two distinct types which are radically different in age and origin.The Precambrian gneissic granited resulted from remelting of old continental crust while the Mesozoic granites were derived ,also through remelting,from low-Rb/Sr rocks at greater depths.Granite masses at Tiantangzhai and Zhoujiawan in the Dabieshan Mountains are also dicussed.     

Sm—Nd and Zircon U—Pb Isotopic Constraints on the Age of Formation of the Precambrian Crust in Southeast China

Nd model ages(TDM) of the Pre-Mesozoic crustal rock samples from Southeast China range from 1.2 to 3.5Ga.Two age peaks of 1.4Ga and 1.8 Ga are observed in the histogram of TDM model ages.Available U-Pb zircon inheritance ages are concentrated around 1.2-1.4Ga,1.8Ga and 2.5Ga,respectively.The combined use of Sm-Nd and U-Pb zircon inheritance ages suggests that the formation of the Precambrian curst is of episodic character.The oldest crustal nucleus may have been formed during the Late Archean(2.5Ga or older?).A rapid production of the crust took place 1.8 Ga ago,consistent with the global crust formation event at 1.7-1.9Ga.Another important episode of the addition of juvenile crustal material from the mantle in Southeast China took place 1.2-1.4Ga ago,during which the pre-existing crust was strongly reworked and/or remelted.     

亚热带山地土壤的地球化学特征及其与新构造运动的关系

对亚热带峨眉山、天目山和凤阳山的列样品研究表明，高、低海拔土壤在矿质风化与淋溶、氧化铁富集与转化、粘粒矿物类型及分布等方面均酷为相似，而这些地球化学特性在相同温差水平带的土壤上却有明显区别，由此推算的新构造运动强度与前人研究结构基本一致。这对阐明山地土壤的发生分类及拓宽新构造运动研究方法等有一定参与价值。     

长江三角洲及其邻近地区的现代地壳垂直运动

本文根据50－80年代复测的精密水准成果，分析了长江三角洲及其邻近地区的地壳垂直运动,并与沿海海面变化在同一均衡基准下进行比较。本区近代地壳垂直运动受区域构造控制，形变速度不高，变化平缓，区内海岸带以下降为主。     

工业区与非工业区辐射雾水的化学组成

1988年冬季，你们对云南省安宁工业区和西双版纳非工业区雾水进行采集，工业区雾水混浊肮脏，含有大量固体颗粒，雾水中离子浓度值与附近工厂排向大气的污染物有关，但雾水酸度值并不高。非工业区雾水比较清洁，雾水中离子浓度值平均比工业区低一个数量级。本文还讨论了一个雾过程离子浓度变化与温度层结的关系。     

湖北省大别山区贫困标准研究

本文利用湖北省大别山五个重点贫困县（罗田、麻城、英山、大悟、红安）的农村住户调查年报分户资料，采用家庭收支平衡，最低生活消费，消费函数、恩格尔系数、在分析等研究方法，提出了湖北省大别山区特困线、贫困线、低收入线标准，并比较探讨了相应的方法及结果的意义和局限。     

地图的重氮树脂胶片复制技术

地图的重氮树脂胶片复制技术赵福贵，王兴惠，王喜，李洪生（哈尔滨飞机制造公司）重江树国ｇ成像系＄ＭＩ胡泊明晰ｄ陪往一．重氮感光树月目征片复制的优点在于：它的稳定性较其它非银盐感光物质稳定，受温度、湿度影响小，幻度高、设备简单，操作容易，因此在航空、汽车...     

灰色时变参数模型及其对气候预报的应用

本文提出关于灰色系统预报的一种新模型，并应用该模型对蒙自5月雨量进行了预报。结果表明:灰色时变参数模型的预报准确性与其他几类模型相比有显著提高。     

Factors Affecting Methane Emission from Rice Paddies

A comparative study of rice paddies and the uncovered water field in Taoyuan(Hunan) showed that methane emission from rice-vegetated paddy fields in 1993 was different from that in 1992(I,e,lower in rates and irregular in pattern).Climate has obvious influence on methane emission .And ebullition made a considerable contribution to the total flux of methane emission from rice paddies (45%).This implies that the intensification of paddy cultivation of rice might not be,as was proposed,the main con-tributor to the observed gradual increasing of atmospheric methane.24-hour automatic measurements of atmospheric temperature,air temperature and methane concentration in the static sampling boxes revealed that temperature,in addition to fertilization and irrigation style,is one of the most important factors that control the emission of methane from rice paddies.