Abstract
Early Precambrian retrogressed eclogites are abundant in the Archean Belomorian Province of the Fennoscandian Shield. Archean zircons with inclusions of omphacite have been found in these eclogites. Similar Archean zircons from the retrogressed eclogites also contain garnet inclusions. The Archean zircons display no negative Eu anomaly, which indicates their crystallization in plagioclase-free rock. Garnet, omphacite and clinopyroxene-plagioclase symplectite as a proxy of omphacite compose ≥75% of the studied rocks, with garnet and omphacite being major constituents and associating with rutile and quartz. These data strongly suggest that the studied rock is eclogite. In the majority of petrogenetic grids, P-T parameters calculated for these rocks fall in the eclogite-facies field. Thus, these findings and data provide evidence that eclogite-facies metamorphism occurred in the Neoarchean.
Highlights
Maksimov, O.A.; Kuzenko, T.I.; Abstract: Early Precambrian retrogressed eclogites are abundant in the Archean Belomorian Province of the Fennoscandian Shield
The authors of the comments do not think that the omphacite that we found as inclusions in Neoarchean zircon “ . . . was derived under eclogite-facies conditions
We follow the definition of eclogite as “plagioclase-free metamorphic rock composed of ≥75% omphacite and garnet, both of which are present as major constituents” ([13], p. 32)
Summary
O.A.; Kuzenko, T.I.; Abstract: Early Precambrian retrogressed eclogites are abundant in the Archean Belomorian Province of the Fennoscandian Shield. Archean eclogite-facies rocks are scarce and used for studies of tectonic evolution of the Each metamorphic complex that contains eclogite attracts the attention of researchers [3], as indicated by comments on our paper published recently.
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