Mesozoic metalliferous sediments from the ophiolites of Ermioni, Greece; analogue to Recent mid-ocean ridge ferromanganese deposits

Varnavas, SP; Panagos, AG

dc.contributor.author	Varnavas, SP	en
dc.contributor.author	Panagos, AG	en
dc.date.accessioned	2014-03-01T01:06:17Z
dc.date.available	2014-03-01T01:06:17Z
dc.date.issued	1984	en
dc.identifier.issn	0009-2541	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9287
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0021289558&partnerID=40&md5=b9ce86360bdfff2c0123cc8df6396c5c	en
dc.subject.classification	Geochemistry & Geophysics	en
dc.title	Mesozoic metalliferous sediments from the ophiolites of Ermioni, Greece; analogue to Recent mid-ocean ridge ferromanganese deposits	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1984	en
heal.abstract	Metalliferous sediments similar to those present at mid-ocean ridges are described for the first time from Greek ophiolites. They occur at Ermioni and form thick layers above the diabase lavas. Their composition as well as their association with sulphide and Mn deposits suggest that they have been formed from interaction between seawater and oceanic crust in a process similar to that of Recent mid-ocean ridge FeMn sediments. In the global mid-ocean ridge hydrothermal fractionation sequence they fall in the class of the widely dispersed oxides. They consist of FeMn- and Fe-oxides with significant areal compositional variations. The marked Cu enrichment found at Baroutospelia is attributed to original enrichment in the hydrothermal solutions rather than to scavenging from seawater. At Roros thin layers of Fe-rich, Mn-poor sediments occur, which show the fractionation of Mn from Fe. Mineralogically the FeMn sediments contain abundant quartz and hematite and minor amounts of illite, smectites and feldspars. The major constituent of the Fe-rich, Mn-poor sediments is hematite; calcite and smectites are present in minor amounts. It is suggested that a compositional and genetic relationship exists between the metalliferous sediments and the sulphide deposits, the elucidation of which may lead to the development of a guideline for the location of more sulphides in Ermioni and in other areas. © 1984.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Chemical Geology	en
dc.identifier.isi	ISI:A1984RX38400016	en
dc.identifier.volume	42	en
dc.identifier.issue	1-4	en
dc.identifier.spage	227	en
dc.identifier.epage	242	en