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P-T-X-controlled element transport through granulite-facies ternary feldspar from Lofoten, Norway

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Abstract

Fluid transport on the grain-scale controls many rock properties and governs chemical exchange. Charnockites from Lofoten indicate fluid penetration into ternary alkali feldspars controlled by their microtextures. In a process of fluid infiltration at granulite-facies conditions (∼600°C and 8–11 kbar), tiny pyroxenes enclosed in alkali feldspar reacted to amphiboles, which are always spatially connected to perthitic albite. Investigation of these microtextures by TEM imaging of Focused Ion Beam (FIB) prepared foils revealed that pyroxenes in contact with albite lamellae show dissolution features. An amorphous Fe- and Cl-bearing material interpreted to be a residuum of the percolating fluid was found within albite lamellae. Textures and mineral compositions indicate that a Cl-rich aqueous fluid attacked the lamellae, which then provided pathways for further fluid flow. A correspondence was found between feldspar compositions, their microtexture and their degree of alteration as a result of their permeability for fluids at specific temperatures. Hence, in addition to pressure and temperature, small variations of feldspar composition can strongly influence the fluid permeability of feldspathic rocks under lower crustal conditions.

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Abbreviations

BSE:

Backscatter electrons

TEM:

Transmission electron microscope

FIB:

Focused ion beam

EMPA:

Electron microprobe analyses

GIF:

Gatan image Filter

EFTEM:

Energy filtered TEM

HAADF:

High annular dark field

STEM:

Scanning TEM

EDX:

Energy dispersive X-ray

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Acknowledgments

The authors are grateful to the GeoForschungsZentrum for providing analytical devices. We are much obliged to Gerhard Berger for sample preparation and Oona Appelt for technical assistance with sample characterization. Discussions with Rainer Abart and a review by Wilhelm Heinrich have substantially improved the manuscript. We are grateful to Ian Parsons and two more anonymous reviewers for their meticulous and thorough reviews which improved the paper significantly. Any surviving errors of omission or commission are entirely ours.

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Authors and Affiliations

  1. GeoForschungsZentrum Potsdam, Dept. 4, Telegrafenberg, 14473, Potsdam, Germany

    Katharina Hartmann & Richard Wirth

  2. Eberhard-Karls Universität Tübingen, Institut für Geowissenschaften, Wilhelmstr. 56, 72074, Tübingen, Germany

    Gregor Markl

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  1. Katharina Hartmann
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  2. Richard Wirth
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  3. Gregor Markl
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Correspondence to Katharina Hartmann.

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Communicated by J. Hoefs.

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Hartmann, K., Wirth, R. & Markl, G. P-T-X-controlled element transport through granulite-facies ternary feldspar from Lofoten, Norway. Contrib Mineral Petrol 156, 359–375 (2008). https://doi.org/10.1007/s00410-008-0290-4

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