Journal ArticleDOI
Pelite facies series and the temperatures and pressures of Dalradian metamorphism in E Scotland
Ben Harte,Neil F. C. Hudson +1 more
TLDR
In this paper, the authors synthesize data on the regional metamorphism of pelites in the eastern Scottish Dalradian, and a Schreinemakers net and petrogenetic grid is presented and fixed in P-T space using experimental data.Abstract:
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.read more
Citations
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Journal ArticleDOI
The effect of TiO2 and Fe2O3 on metapelitic assemblages at greenschist and amphibolite facies conditions: mineral equilibria calculations in the system K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2-Fe2O3
TL;DR: In this article, the authors used thermocalc and its internally consistent thermodynamic dataset to constrain the effect of TiO2 and Fe2O3 on greenschist and amphibolite facies mineral equilibria.
Journal ArticleDOI
New mineral activity-composition relations for thermodynamic calculations in metapelitic systems
TL;DR: In this paper, activity composition (a-x) relations for minerals commonly occurring in metapelites are presented for use with the internally consistent thermodynamic dataset of Holland & Powell (2011, Journal of Metamorphic Geology, 29, 333-383).
Book
Principles of igneous and metamorphic petrology
Anthony R. Philpotts,Jay J. Ague +1 more
TL;DR: The authors provides a basic understanding of the formative processes of igneous and metamorphic rock through quantitative applications of simple physical and chemical principles, and encourages a deeper comprehension of the subject by explaining the petrologic principles.
Principles of Igneous and Metamorphic Petrology
Anthony R. Philpotts,Jay J. Ague +1 more
TL;DR: The second edition of the Petrology Textbook as mentioned in this paper provides a fundamental understanding of the formative processes of igneous and metamorphic rocks, and encourages a deeper comprehension of the subject by explaining the petrologic principles.
Journal ArticleDOI
The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals
TL;DR: In this article, the a-x relations for metapelitic rocks in the MnO-Na2O-CaO-K 2O-FeO-MgO-Al2O3-SiO2-H2O -TiO2 O2-O22 (MnNCKFMASHTO) system were extended to include MnO.
References
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Journal ArticleDOI
Stability of andalusite and the aluminum silicate phase diagram
TL;DR: In this article, the effects of Si-Al disorder, fibrolite and sample preparation, comparison with previous data, geothermal gradient implications, and comparison of previous data were discussed.
Journal ArticleDOI
Fe-Mg cordierite stability in high-grade pelitic rocks based on experimental, theoretical, and natural observations
M. J. Holdaway,Sang Man Lee +1 more
TL;DR: In this paper, a P-X diagram for the Fe-Mg analogue of this reaction at 675 ° C is consistent with a naturally occuring cordierite-biotite K====== D ≥ 0.53 if Al content of biotite and cordierites water of hydration are taken into account.
Journal ArticleDOI
The influence of erosion upon the mineral fades of rocks from different metamorphic environments
P. C. England,S. W. Richardson +1 more
TL;DR: The mineral facies of rocks reaching the surface do not reflect any one geotherm through the pile but lie on a locus of P-T conditions, the metamorphic geotherms which will generally be concave towards the temperature axis as mentioned in this paper.
Journal ArticleDOI
On the mechanism of prograde metamorphic reactions in quartz-bearing pelitic rocks
TL;DR: In this paper, an empirical method is described whereby the sequence of textural changes in pelitic rocks from one zone to the next may be reconciled with the balanced metamorphic reaction inferred to have been in progress.