| dc.contributor.author |
Migiros, G |
en |
| dc.contributor.author |
Hatzipanagiotou, K |
en |
| dc.contributor.author |
Gartzos, E |
en |
| dc.contributor.author |
Serelis, K |
en |
| dc.contributor.author |
Tsikouras, B |
en |
| dc.date.accessioned |
2014-06-06T06:44:20Z |
|
| dc.date.available |
2014-06-06T06:44:20Z |
|
| dc.date.issued |
2000 |
en |
| dc.identifier.issn |
00092819 |
en |
| dc.identifier.uri |
http://62.217.125.90/xmlui/handle/123456789/1811 |
|
| dc.relation.uri |
http://www.scopus.com/inward/record.url?eid=2-s2.0-0034022784&partnerID=40&md5=9813f785e11acdec9beb99b6a5580718 |
en |
| dc.subject.other |
ophiolite |
en |
| dc.subject.other |
petrogenesis |
en |
| dc.subject.other |
ultramafic rock |
en |
| dc.subject.other |
Greece |
en |
| dc.title |
Petrogenetic evolution of ultramafic rocks from Lesvos Island (NE Aegean, Greece) |
en |
| heal.type |
journalArticle |
en |
| heal.publicationDate |
2000 |
en |
| heal.abstract |
The ophiolitic unit in the SE Lesvos constitutes the uppermost tectonic nappe, consisting of ultramafic rocks with minor gabbroic dykes and an amphibolite sole. The most abundant lithologies comprise lherzolite and harzburgite with minor dunite. The harzburgite member and the dunite are intensively serpentinized. The harzburgite has chemical affinity analogous to Alpine peridotites while the lherzolite is more fertile and resembles some abyssal peridotites. Both have undergone partial melting and depletion as indicated by geochemical and mineralogical results. The exsolution of clinopyroxene and spinel from orthopyroxene indicates elemental redistribution in the pyroxenes and hence geothermometric calculations based on pyroxenes cannot give the original temperatures of formation. Therefore, our geothermobarometric calculations indicate a later cooling episode, which occurred after the formation of porphyroclasts in a temperature range of 1100-650°C and at pressures of about 6-7 kbars. Metasomatic phenomena that affected the Lesvos peridotites resulted in low MgO/FeO(t) ratios and enrichment in some incompatible trace elements together with the formation of amphibole. Chemical affinities and mineralogical compositions suggest that the Lesvos peridotites originated in a marginal basin regime. |
en |
| heal.journalName |
Chemie der Erde - Geochemistry |
en |
| dc.identifier.issue |
1 |
en |
| dc.identifier.volume |
60 |
en |
| dc.identifier.spage |
27 |
en |
| dc.identifier.epage |
46 |
en |