·386- 北京科技大学学报 1999年第4期 参考文献 2韩建友，彭伟斌.铰链四杆直线机构在特殊位形下解析 1张苏华，韩建友具有5点接触直线的铰链四杆机构的 综合法探讨.北京科技大学学报，1999,21(2：191 综合.北京科技大学学报，1999,21(4)：379 3格罗尼穆斯.平面机构综合理论的几何工具，北京：机 械工业出版社，1966 Analytic Synthesis of Crank and Rocker Straight-line Linkages Han Jianyou,Zhang suhua Mechanical Engineering Schocl,UST Beijing,Beijing 100083,China ABSTRACT An analytic method for the synthesis of crank and rocker straight-line linkages in a special configuration was presented.With this method,it is convenient to synthesize the crank and rocker straight- line linkage,which coupler curve has a 4-point contact with its tangent(so called Ball's point).The formulae are derived and synthesis examples are illustrated. KEY WORDS crank and rocker linkage;straight-line path;synthesis 本本米*农来命女杂海海杂海★本条米年年本※华为海本食★本条华本冷染治米食本意杂冷※特体染条条冷女米举本女染海米旅米海餐张★举水★常旅茶冷布渐米渐章海卷冷米* [Journal of University of science and Tecgnology Beijing (English Edition),1999,6(2):77] Characteristics of Ore-Forming Fluids of Gold Deposits in Daqingshan District,Inner Mongolia,China Jiuhua Xu,Yuling Xie,Dayi Oian,Rufu Ding,Jianping Li Abstract:Located in the mid-west of Inner Mongolia,Daqingshan district has many gold deposits occurring along a east-west striking ductile shear zone within a greenstone belt,which is mainly composed of the Arche- an Wulashan group.The hydrothermal mineralization can be divided into four stages:(1)pyrite-quartz,(2) quartz-pyrite,(3)polymetallic sulfides and(4)carbonates-quartz.The major metallic minerals in the ore of gold-bearing veins are native gold,electrum,pyrite,chalcopyrite and galena,but the gangue minerals are ma- inly quartz,secondarily sericite,ankerite and calcite.Principal alteration patterns in the gold deposits are seri- citization,silicification,pyritization,carbonatization and chloritization.An investigation on fluid inclusions shows that the ore-forming fluids were low in salinities and high in CO:content.Measured &D of fluid in- clusions in quartz from the ore veins ranges from-65%to-104 %but Oaurn from 10.0%to 12.8%0.The- se data show that the water in hydrothermal fluid precipitating the ore bodies could have been mainly mag- matic water and metamorphic water,but local meteoric water might take part in the late mineralization.C from fluid inclusions in the ore varys from -3.3%0 to-6.2 %indicating that carbon was derived from mag- matic or anatectic source."S from sulfide samples in gold deposits ranges from-4.1%to +4.0%,which are identical with that from Shi,et al..It is concluded that the gold deposits in Daqingshan district are similar to those in Xiaoqinling area,in aspects of geological characteristics,mineral association and stable isotope composition. Key words:fluid inclusions;isotope composition;gold deposit;Daqingshan area一 · 北 京 科 技 大 学 学 报 年 第 期 参 考 文 献 张苏华 ， 韩建友 具有 点接触直线 的铰链 四杆机构 的 综合 北京科技大学学报 ， ， 韩建友 ，彭伟斌 铰链四杆直线机构在特殊位形下解析 综合法探讨 · 北京科技大学学报 ， ， 格罗尼穆斯 平面机构综合理论的几何工具 北京 机 械工业 出版社 ， 一 刀 ， ， ， ， 一 ， ， 一 ， 一 粉 夕 扩 五刀 ， ， 一 ， ， 火公 ， ， ’ ， ， 一 ， 一 ， 一 ， 一 ， 一 八 一 ， 刀 ， ， ， ， ， ， ， ， 一 犯 一 一 ， 咨 ，吕 。 印 ’ 咨 一 一 ， 夕 ‘ 一 ， ， 二 加 ，