Diamond, former coesite and supersilicic garnet in metasedimentary rocks from the Greek Rhodope: a new ultrahigh-pressure metamorphic province established

Mposkos, ED Kostopoulos, DK

Ed. Mposkos et Dk. Kostopoulos, Diamond, former coesite and supersilicic garnet in metasedimentary rocks from the Greek Rhodope: a new ultrahigh-pressure metamorphic province established, EARTH PLAN, 192(4), 2001, pp. 497-506

39

INGLESE

Article

Earth Sciences

EARTH AND PLANETARY SCIENCE LETTERS

0012-821X → ACNP

192

4

2001

497 - 506

ISI

0012-821X(20011115)192:4<497:DFCASG>2.0.ZU;2-E

We report here the first discovery of ultrahigh-pressure (UHP) indicator mi nerals and textures from the Rhodope Metamorphic Province (RMP), northern G reece, In particular, we document the exsolution of quartz, rutile and apat ite in sodic garnet from metapelites (garnet-biotite-kyanite gneisses), whi ch attests to the presence of a Si-Ti-Na-P-rich precursor garnet phase. Sim ilar textures in garnet have been reported in the literature only once befo re for eclogites from the Su Lu UHP metamorphic province, China. We also do cument the presence of microdiamonds and multicrystalline quartz pseudomorp hs after coesite, included in garnet from both eclogites and metapelites. W e then argue that these rocks had once been transported to depths exceeding 220 kin, well into the upper mantle, thus establishing the RMP as another important UHP metamorphic belt in the world. (C) 2001 Elsevier Science B.V. All rights reserved.