'New Constraints on the P-T Evolution of the Alpe Arami Garnet Peridotite Body (Central Alps, Switzerland)': Reply to Comment by Nimis & Trommsdorff (2001)

doi:10.1093/petrology/42.9.1781

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Journal of Petrology Volume 42 Number 9 Pages 1781-1787 2001
© Oxford University Press 2001

‘New Constraints on the P–T Evolution of the Alpe Arami Garnet Peridotite Body (Central Alps, Switzerland)’: Reply to Comment by Nimis & Trommsdorff (2001)

J. PAQUIN^,* and R. ALTHERR

MINERALOGISCHES INSTITUT, UNIVERSITÄT HEIDELBERG, IM NEUENHEIMER FELD 236, 69120 HEIDELBERG, GERMANY

Received May 14, 2001; Revised typescript accepted May 18, 2001

INTRODUCTION

Nimis & Trommsdorff (2001a) (hereafter N&T) offer analternative and somewhat challenging interpretation of the texturaland mineral compositional features displayed by the Alpe Arami(AA) peridotite body. Although N&T dispute some of the argumentsused by Paquin & Altherr (2001) (hereafter P&A), theynow agree that the AA peridotite has indeed experienced hightemperatures of 1100–1200°C as indicated by the partitioningof elements with high diffusivities (Fe, Mg, Ni, Co) betweenthe cores of grt, ol, opx and cpx grains (Brenker & Brey,1997; P&A). We are therefore left with the key problem ofwhy the application of two-pyroxene thermometers based on elementswith low diffusivities (Ca, Sc, Cr, V, Ti) results in low andstrongly scattering temperature values (i.e. 690–925°C;P&A; Nimis & Trommsdorff, 2001b). P&A conclude thatthe discrepancy between the high and low temperature valuesis due to a lack of . . . [Full Text of this Article]

   REPLY

Ca partitioning between Opx and Cpx
Al in opx and Cr in cpx
Al zoning in pyroxenes
The high-T stage
Igneous event being responsible for high temperatures

   CONCLUSIONS

   ACKNOWLEDGEMENTS

   FOOTNOTES

   REFERENCES

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