Pelite facies series and the temperatures and pressures of Dalradian metamorphism in E Scotland
Pelite facies series and the temperatures and pressures of Dalradian metamorphism in E Scotland
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苏格兰东部泥岩相系列及达尔拉德变质作用的温度和压力
DOI：
10.1144/gsl.sp.1979.008.01.36
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
N. Hudson
中科院分区：
文献类型：
--
作者：
B. Harte;N. Hudson
本文试图综合苏格兰东部达拉迪亚地区泥质岩的区域变质作用资料。提出了矿物组合的带状序列(相系列)，并分离了传统上公认的巴罗夫变质作用和巴肯变质作用的变体。利用实验数据建立了KFMASH系统的Schreemaker网和成岩网格，并将其固定在P-T空间中。利用不同相系的P-T资料，结合其他约束条件，建立了该区等温线和等压线分布模型，并注意了变质后褶皱对等温线的影响。垂直于等压线的P-T梯度表明，该地区大部分地区的地温梯度总体上是向T轴凸起的，并认为它们是深部岩浆侵入的结果。与高地边界断裂相邻的区域显示出强烈的水平和垂直温度梯度，初步解释为达拉迪亚变质带存在一条变质构造边界。
Summary An attempt is made to synthesise data on the regional metamorphism of pelites in the eastern Scottish Dalradian. Zonal sequences (facies series) of mineral assemblages are presented and variants of the traditionally recognised Barrovian and Buchan metamorphism are separated. A Schreinemakers net and petrogenetic grid for the system KFMASH is presented and fixed in P-T space using experimental data. The P-T data for the various facies series are used in conjunction with other constraints to develop a model of isotherm and isobar distribution in the region, and the effects of post metamorphic folding of the isopleths are noted. P-T gradients normal to isobars suggest overall ‘geothermal’ gradients for most of the area to be convex to the T-axis, and it is suggested that they result from magma intrusion at depth. The region adjacent to the Highland Boundary fault shows strong horizontal and vertical temperature gradients which are tentatively interpreted to indicate the presence of a synmetamorphic tectonic boundary to the Dalradian metamorphic belt.