Crystal growth and nucleation in two large diabase dikes
Crystal growth and nucleation in two large diabase dikes
复制标题
两个大型辉绿岩岩脉中的晶体生长和成核
DOI：
10.1139/e70-033
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发表时间：
1970
影响因子：
1.4
通讯作者：
N. H. Gray
中科院分区：
文献类型：
--
作者：
N. H. Gray
在离半无限侵入体接触面y处单位体积结晶岩浆中形成的单相核总数Z为其中n是由成核期生长控制过程决定的数值常数，而成核速率表达式中的m值为J观察到的单斜辉石和斜长石的Z从接触点向两个大岩脉中心的变化似乎遵循这种关系。在106米宽的Kigaviarluk橄榄拉斑玄武岩岩脉中，单斜辉石的n值（−2.2）明显大于斜长石的n值（−0.84）。 在60米长的格伦维尔岩脉（一种石英拉斑玄武岩）中，两种矿物的n值（-1.5）相同。 斜长石和单斜辉石的生长控制机制似乎是敏感的，从它的结晶岩浆的整体组成。
The total number of nuclei, Z, of a single phase formed in a unit volume of a crystallizing magma at the distance y from the contact of a semi-infinite intrusion iswhere n is a numerical constant determined by growth controlling process during the nucleation period and the value of m in the expression assumed for the nucleation rate, JThe observed variation of Z for clinopyroxene and plagioclase from the contact towards the center of two large dikes appears to follow this relation. In the 106 m wide Kigaviarluk olivine tholeiite dike the value of n is significantly greater for the clinopyroxene (−2.2) than the plagioclase (−0.84). In the 60 m Grenville dike, a quartz tholeiite, the n value (−1.5) is the same for both minerals. The growth-controlling mechanisms of plagioclase and clinopyroxene appears to be sensitive to the bulk composition of the magma from which it is crystallizing.