BRÖCKER, MICHAEL, ENDERS, MICHAEL (1999) U–Pb zircon geochronology of unusual eclogite-facies rocks from Syros and Tinos (Cyclades, Greece) Geological Magazine, 136 (2) 111-118 doi:10.1017/s0016756899002320
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | U–Pb zircon geochronology of unusual eclogite-facies rocks from Syros and Tinos (Cyclades, Greece) | ||
| Journal | Geological Magazine | ||
| Authors | BRÖCKER, MICHAEL | Author | |
| ENDERS, MICHAEL | Author | ||
| Year | 1999 (March) | Volume | 136 |
| Page(s) | 111-118 | Issue | 2 |
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s0016756899002320Search in ResearchGate | ||
| Mindat Ref. ID | 258063 | Long-form Identifier | mindat:1:5:258063:4 |
| GUID | 02717557-dcea-493b-b880-52dbbb6a4799 | ||
| Full Reference | BRÖCKER, MICHAEL, ENDERS, MICHAEL (1999) U–Pb zircon geochronology of unusual eclogite-facies rocks from Syros and Tinos (Cyclades, Greece) Geological Magazine, 136 (2) 111-118 doi:10.1017/s0016756899002320 | ||
| Plain Text | BRÖCKER, MICHAEL, ENDERS, MICHAEL (1999) U–Pb zircon geochronology of unusual eclogite-facies rocks from Syros and Tinos (Cyclades, Greece) Geological Magazine, 136 (2) 111-118 doi:10.1017/s0016756899002320 | ||
| In | (1999, March) Geological Magazine Vol. 136 (2) Cambridge University Press (CUP) | ||
| Abstract/Notes | Low-temperature eclogite-facies rocks from Syros and Tinos (Cyclades, Greece) include meta-igneous blocks of unclear origin (meta-olistostrome or tectonic mélange) with very high trace element concentrations (e.g. Zr up to 4850 ppm; Y up to 475 ppm). The unusual geochemistry is considered to be the result of metasomatic alteration in a subduction-zone environment. Locally, metasomatic exchange with an ultramafic matrix further enhanced compositional anomalies. A concordant U–Pb zircon age of 78±1 Ma recorded for an omphacitite from Syros is interpreted as the time of pre-Eocene high-pressure metamorphism in the Cyclades. Zircon dates of 61 and 63 Ma for a jadeitite from Tinos possibly indicate an additional discrete event (deformation?). These results are a first geochronological indication that high-pressure metamorphism in the Cyclades commenced significantly earlier than indicated by previous white mica chronology which provided ages between c. 50 and 40 Ma. | ||
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