Alkalic-type epithermal gold mineralization associated with Tongshi complex in Pinyi County, Shandong Province

THE alkali-rich subvolcanic complex of Tongshi and the associated gold mineralization are located at thesouth boundary of Pinyi Mesozoic volcanic depression in western Shandong Province. There are morethan 30 gold deposits and mineralization locations around the complex, in which Guilaizhuang gold deposit and Zhuojiazhuang bonanza gold deposit with important economic value are included. This area isbecoming a perspective target of superlarge gold deposit. In the mine area, there crop out Archeangranitic gneisses, Paleozoic carbonates and Jurassic clastic rocks, which was intruded by Tongshi complexwith 30 km. The complex consists of K-high igneous rocks formed by two stages of magmatism. In thefirst stage, the monzonitic dioritic porphyrys, which belong to K-high calc-alkalic rocks, were formed andin the second stage, monzonitic-syenitic porphyrys, which belong to K-high alkalic rocks, were formed.Their Ar-Ar ages are 189 Ma and 188 Ma, respectively. At the end of the second stage, a lot of theexplosive breccias were formed. The gold mineralization in this area is closely associated in time andspace with the second stage monzonitic-syenitic porphyrys. Based on the characteristics of

平邑甜茶后代双胚苗的倍性鉴定及核型分析

为了确定平邑甜茶双胚苗的倍性特征和核型特点,采用压片和流式细胞仪观测的方法对平邑甜茶后代中双胚苗进行染色体倍性观察和核型分析。结果表明:4株供试材料均为三倍体,2n=3x=51,染色体为小型,染色体长度比差异不大;核型组成由中部着丝点染色体(m)和亚中部着丝点染色体(sm)组成;株系8-1、8-2、12-1和12-2的核型公式分别为2n=3x=45m+6sm,2n=3x=48m+3sm,2n=3x=27m+24sm,2n=3x=33m+18sm;染色体相对长度和着丝点指数的变异范围分别为1.21%～2.68%和34.19%～42.37%,1.44%～2.63%和35.59%～44.08%,1.36%～3.02%和32.85%～42.18%,1.43%～2.87%和34.23%～44.02%;核型分别属于1B、1A、2B和1B类型,表现为株系之间的核型不完全相同。本研究为丰富无融合生殖型砧木的育种理论,获得新的苹果无融合生殖型砧木提供有益的借鉴。

略论汉语拼音与海外儿童汉语教学

汉语拼音在海外儿童汉语教学中的作用举足轻重,然而其相关理论研究却十分缺乏。本文探讨了与此相关的几个问题:(1)汉语拼音在海外儿童汉语教学中的认知功能,提出对汉语拼音"教学"和"学习"加以区分;(2)儿童双文学习优势理论以及双文学习视阈下的汉语拼音教学;(3)海外儿童汉字教学现状及汉语拼音与汉字的衔接问题。最后讨论海外儿童汉语教学的总目标,提出总目标应同时包含口语交际和汉字能力培养两方面。儿童年龄越小前者内容越多;随着儿童年龄增大后者的强度可逐渐增大;儿童汉语口语交际能力的培养应以长期扎实的汉语拼音学习为基础。