Domainal and fabric heterogeneities in the Cap de Creus quartz mylonites
Domainal and fabric heterogeneities in the Cap de Creus quartz mylonites
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Cap de Creus 石英糜棱岩的域和结构异质性
DOI：
10.1016/0191-8141(82)90035-9
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
A. Celma
中科院分区：
文献类型：
--
作者：
A. Celma
报告了 Cap de Creus 纯石英糜棱岩中微结构和 c 轴织物的特征域配置，如来自不同剪切带中心的 50 个样品所示。三种类型的域是founda、bandc。每个域都有不同的 c 轴取向模式。这三种织物元素也标记为“da”、“bandc”，构成了整个织物。 c 轴织物相对于主要糜棱体叶理是对称或不对称的，具体取决于 b 域及其织物元素的存在或不存在。区域的边界平行于主要的糜棱岩叶理。两种域类型a和b显示由平行于域内光学取向方向的优选晶界排列定义的内部叶理。内部叶理在两种不同的意义上与主要糜棱岩叶理倾斜，使样品呈现人字形外观。这些内部叶状结构被证明与延伸的细齿状结构有关。域不是由主体控制的重结晶产生的。织物单元和相应的域是运动学异质性在薄片尺度上的表达。
A characteristic domainal configuration is reported for both micro-structures and c-axis fabrics in the Cap de Creus pure quartz mylonites as displayed in 50 samples from the centres of different shear zones. Three types of domains are founda,bandc. Each domain has a distinct c-axis orientation pattern. These three fabric elements, also labelleda,bandcmake up the total fabric. c-axis fabrics are symmetric or asymmetric with respect to the main mylonitic foliation depending on the presence or absence of thebdomain and its fabric element. The boundaries of the domains are parallel to the main mylonitic foliation. Two domain types,aandbdisplay an internal foliation defined by preferred grain boundary alignment parallel to the direction of optical orientation within the domain. The internal foliations are oblique to the main mylonitic foliation in two different senses giving the sample a herring-bone appearance. These internal foliations are shown to be related to extensional crenulations. Domains are not produced by host-controlled recrystallization. The fabric elements and corresponding domains are the expression of kinematic heterogeneities on the scale of the thin section.