期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
日光温室栽培无花果麦司依陶芬生育特性研究
1
作者 王国东 《黑龙江农业科学》 2014年第8期78-80,共3页
为丰富北方温室栽培果树树种,对日光温室栽培无花果麦司依陶芬的生长表现进行了调查.结果表明:麦司依陶芬在“一字形”重短截状态下萌发的新梢生长量大,圆柱形轻短截状态下新梢生长量小.一年生枝条的顶芽内雏梢分化优于侧芽,采收期集中... 为丰富北方温室栽培果树树种,对日光温室栽培无花果麦司依陶芬的生长表现进行了调查.结果表明:麦司依陶芬在“一字形”重短截状态下萌发的新梢生长量大,圆柱形轻短截状态下新梢生长量小.一年生枝条的顶芽内雏梢分化优于侧芽,采收期集中在8月10日~10月10日,该品种适宜日光温室环境条件,丰产,2011和2012年单产分别达19 263.9和18 012.45 kg·hm2,可以在温室栽培果树生产中应用. 展开更多
关键词 日光温室 无花果 生长发育规律
下载PDF
文象花岗岩的成分、结构和成因机制 被引量:3
2
作者 徐海军 张超 +1 位作者 武云 陶明 《地球科学(中国地质大学学报)》 EI CSCD 北大核心 2016年第9期1511-1525,共15页
文象花岗岩具有特殊文象结构,研究其三维拓扑结构和形成过程有助于了解花岗质岩石的结晶作用.以北京周口店房山岩体和湖北罗田蕙兰山的文象花岗岩为研究对象,综合利用光学显微镜、扫描电镜、电子探针和电子背散射衍射等技术方法,对... 文象花岗岩具有特殊文象结构,研究其三维拓扑结构和形成过程有助于了解花岗质岩石的结晶作用.以北京周口店房山岩体和湖北罗田蕙兰山的文象花岗岩为研究对象,综合利用光学显微镜、扫描电镜、电子探针和电子背散射衍射等技术方法,对岩石矿物组成、结晶学取向和拓扑结构进行了系统研究.结果表明:(1)文象花岗岩的矿物组成与其形成地质环境有关,石英和长石的含量变化范围很大,其中石英含量通常在20%~45%,但是相同地区同期形成的文象花岗岩具有相对稳定的矿物组成;(2)长石作为寄主矿物通常呈半自形一自形粗大晶体,可以是碱性长石或斜长石,其端元组分以钾长石和钠长石为主,低温下常分解为条纹长石;(3)石英在长石寄主矿物中规则穿插生长,在三维空间通常呈近似平行板状、长条状/柱状或非连通枝权状,并只在特定岩石断面形似象形文字;(4)正交偏光显微镜下,石英可以具有多种消光位,但是通常在一定范围内同时消光;(5)石英普遍发育道芬双晶,偶见日本双晶;(6)条纹长石中钾长石与钠长石对应(100)、(010)、(001)面和[001]轴近似平行;(7)多数石英颗粒与寄主长石之间具有密切结晶学取向关系,即石英[1123]轴近似平行长石c[001]轴.该研究证实文象花岗岩是石英和长石同时生长的结果,而长石作为寄主矿物影响并控制着石英的成核与生长方向. 展开更多
关键词 文象花岗岩 文象结构 电子背散射衍射 道芬双晶 拓扑结构 晶体光学 矿物学.
原文传递
SEM/EBSD analysis of quartz cementation and compaction microstructures during diagenesis of sandstone 被引量:4
3
作者 ZHANG Bo YAN ShuYu +1 位作者 GU ZhiDong ZHANG JinJiang 《Science China Earth Sciences》 SCIE EI CAS 2013年第8期1281-1293,共13页
Compaction and silicon cementation are the dominant processes reducing porosity and permeability in quartzose sandstones during diagenesis. Despite the wealth of information about quartz cementation, there are still u... Compaction and silicon cementation are the dominant processes reducing porosity and permeability in quartzose sandstones during diagenesis. Despite the wealth of information about quartz cementation, there are still unanswered questions related to mechanisms of growth of quartz cement and the diagenesis processes. In this study we present an electron backscatter diffraction (EBSD) analysis, combined with optics and cathodoluminescence (CL) information, for the quartz sandstones from the Upper Triassic Xujiahe Formation of Sichuan Basin, in order to reveal the microstructural and crystallographic features of the silica cementation and detrital grain during the compaction. The EBSD is a crucial technique to provide essential crystallographic data on the quartz grain and its cement. Quartz cement is shown to be syntaxial to its host quartz grain. EBSD data-based orientation maps show dauphin6 twinning and low angle boundary to be common in the host grains and quartz cement of the samples. The dauphin6 twins occurred in grain-grain contacts and in cement-crystal boundaries, and commonly crossed grain cement boundaries. These features indicate that there may be two types of dauphin6 twins, one inherited twins from the source area and the other developed by compaction-induced grain boundary deformation. These investigations suggest that strong mechanical compaction may occur after and/or during quartz cement growth in the later diagenesis of the Xujiahe sandstones. EBSD has a capability of revealing microstructural information and regarding mechanisms of diagenesis crystal growth in quartzose sandstones. 展开更多
关键词 SANDSTONE quartz cement COMPACTION dauphin~ twins low angle boundary electron backscatter diffraction
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部