Plagioclase twins in a basalt: an electron backscatter diffraction study
Plagioclase twins in a basalt: an electron backscatter diffraction study
复制标题
玄武岩中的斜长石孪晶：电子背散射衍射研究
DOI：
10.1107/s1600576716015739
复制
发表时间：
2016-12
影响因子：
6.1
通讯作者：
He Xu
中科院分区：
文献类型：
--
作者：
Xu Chang;Zhao Shan-Rong;Li Chuan;He Xu
斜长石中的双生体在岩石中十分丰富，对其生长历史和随后的转变具有重要意义。斜长石中存在许多孪生规律，其中一些规律很难识别。本文对牛头山碱性玄武岩斜长石孪晶进行了电子背散射衍射（EBSD）和电子探针分析。得到了12种不同的斜长石双生定律的理论极点图。通过与理论极点图的比较，在碱性玄武岩中发现了11个孪生定律，并确定了它们的频率：alite（28%）、Carlsbad（25%）、alite - Carlsbad（34%）、Pericline（3%）、Ala（2%）、Manebach（1%）、alite - Ala（1%）、Prism{110}（2%）、Prism {1\bar 10}（1%）、Prism{130}（1%）和Prism {1\bar 30}（1%）。碱玄武岩中的斜长石孪晶均为生长孪晶。斜长石的钙长石含量与中长石和钠长石双生规律的频率呈负相关，而与其他双生规律的频率呈正相关，与前人的研究结果一致。本文所介绍的斜长石双生规律的理论极点图可用于研究所有含斜长石的岩石中的斜长石双生规律，并可建立岩石的双生模式与结晶条件之间的关系。
Twins in plagioclase, which are abundant in rocks, have important implications for the growth history and subsequent transformation. There are many twin laws in plagioclase and some of them are difficult to identify. This paper presents an electron backscatter diffraction (EBSD) analysis combined with electron microprobe analysis of plagioclase twinning in the Niutoushan alkali basalt. Theoretical pole figures of 12 different twin laws for plagioclase were generated. By comparing the pole figures obtained from EBSD with the theoretical ones, 11 twin laws have been identified in the alkali basalt, and their frequency has also been determined: Albite (28%), Carlsbad (25%), Albite–Carlsbad (34%), Pericline (3%), Ala (2%), Manebach (1%), Albite–Ala (1%), Prism {110} (2%), Prism {1\bar 10} (1%), Prism {130} (1%) and Prism {1\bar 30} (1%). All the plagioclase twins in the alkali basalt are growth twins. The anorthite content of the plagioclase has a negative correlation with the frequency of the Pericline and Albite twin laws but a positive correlation with the frequency of all the other twin laws, which is consistent with previous results. The theoretical pole figures of twin laws for plagioclase introduced in this paper can be applied to investigating plagioclase twin laws in all plagioclase-bearing rocks, and the relationship between twin pattern and crystallization conditions of the rocks can be established.
登录
查看更多内容
影响因子：
2.2
作者：
A. Pickersgill;G. Osinski;R. Flemming
通讯作者：
A. Pickersgill;G. Osinski;R. Flemming
影响因子：
3.1
作者：
F. J. Turner
通讯作者：
F. J. Turner
影响因子：
3.1
作者：
M. Buerger
通讯作者：
M. Buerger
影响因子：
3.1
作者：
Jun Wu;D. Veblen
通讯作者：
Jun Wu;D. Veblen
影响因子：
2.9
作者：
R. T. Cannon
通讯作者：
R. T. Cannon