Book ChapterDOI
Petrography and Mineral Chemistry of Pelites
David R. M. Pattison,Ben Harte +1 more
- pp 135-179
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In this article, the authors describe the petrography and mineral chemistry of an exceptionally well-developed sequence of prograde mineral zones in pelitic and semipelitic rocks in the Ballachulish aureole.Abstract:
This chapter describes the petrography and mineral chemistry of an exceptionally well-developed sequence of prograde mineral zones in pelitic and semipelitic rocks in the Ballachulish aureole. Two schematic petrogenetic grids are derived: the first is for mineral assemblages below the onset of partial melting, which define the mapped isograds in Maps 1 and 2 and Figure. 8.1; and the second is for high-grade mineral assemblages which occur sporadically within the zone of partial melting (Harte et al., Chap. 9, this Vol.) and within pelitic screens within the igneous complex. The two grids, when linked, provide a continuous petrogenetic grid from the lowest to highest grade in the aureole. In Pattison (Chap. 16, this Vol.) the continuous grid is calibrated in P-T space.read more
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Journal ArticleDOI
The Ti-saturation surface for low-to-medium pressure metapelitic biotites: Implications for geothermometry and Ti-substitution mechanisms
TL;DR: The relationship between Ti-content, temperature, and Mg/(Mg + Fe) value was calibrated empirically using an extensive natural biotite data set (529 samples) from western Maine and south-central Massachusetts in combination with the petrogenetic grid of Spear et al..
Journal ArticleDOI
Temperatures of Granulite-facies Metamorphism: Constraints from Experimental Phase Equilibria and Thermobarometry Corrected for Retrograde Exchange
TL;DR: Pattison et al. as mentioned in this paper applied a thermobarometry method to 414 granulites of mafic, intermediate and aluminous bulk compositions and found that they are much hotter than traditionally assumed and that the P±T conditions of the amphibolite±granulite transition portrayed in current petrology textbooks are significant underestimates by over 100 C.
Journal ArticleDOI
On the Use of Changes in Dihedral Angle to Decode Late-stage Textural Evolution in Cumulates
TL;DR: In this paper, it was shown that the melt-filled pore structure in the final stages of solidification of cumulates must lie somewhere between the two end-members of impingement (in which pore topology is controlled entirely by the juxtaposition of growth faces of adjacent grains) and textural equilibrium, and the exact position between these two endmembers is controlled by the minimization of internal energies.
Journal ArticleDOI
Partial melting of the Appin Quartzite driven by fracture-controlled H[sub]2O infiltration in the aureole of the Ballachulish Igneous Complex, Scottish Highlands
TL;DR: In this paper, a textural examination of the arkosic Appin Quartzite, which was previously believed to have melted only within a few metres of the intrusion, demonstrates that partial melting occurred up to 500 m away from the vertical eastern contact.
Journal ArticleDOI
Thermodynamic modelling of the reaction muscovite+cordierite→Al2SiO5+biotite+quartz+ H2O: constraints from natural assemblages and implications for the metapelitic petrogenetic grid
TL;DR: In this article, the authors proposed a low pressure metapelitic petrogenetic grid in the system K2O-FeO-MgO-Al2O3-SiO2-H2O (KFMASH) which satisfies most of the natural and experimental constraints.