| dc.contributor.author |
Gartzos, E |
en |
| dc.contributor.author |
Dietrich, VJ |
en |
| dc.contributor.author |
Davis, E |
en |
| dc.date.accessioned |
2014-06-06T06:43:55Z |
|
| dc.date.available |
2014-06-06T06:43:55Z |
|
| dc.date.issued |
1999 |
en |
| dc.identifier.issn |
00367699 |
en |
| dc.identifier.uri |
http://62.217.125.90/xmlui/handle/123456789/1553 |
|
| dc.relation.uri |
http://www.scopus.com/inward/record.url?eid=2-s2.0-0032723183&partnerID=40&md5=e34e511656fe15edf49f115055977c55 |
en |
| dc.subject |
Akrotiri Volcanic Complex |
en |
| dc.subject |
Amphibole |
en |
| dc.subject |
Fractional crystallisation |
en |
| dc.subject |
Magma mingling |
en |
| dc.subject |
Magma mixing |
en |
| dc.subject |
Magmatic inclusions |
en |
| dc.subject |
Santorini |
en |
| dc.subject |
Volcanism |
en |
| dc.subject.other |
crystallization |
en |
| dc.subject.other |
Greece |
en |
| dc.subject.other |
amphibole |
en |
| dc.subject.other |
dacite |
en |
| dc.subject.other |
differentiation |
en |
| dc.subject.other |
fractional crystallization |
en |
| dc.subject.other |
magma |
en |
| dc.subject.other |
mixing |
en |
| dc.subject.other |
plagioclase |
en |
| dc.subject.other |
Greece |
en |
| dc.title |
Amphibole-plagioclase fractional crystallisation and magma mixing as major differentiation processes in the Akrotiri Volcanic Complex, Santorini, Greece |
en |
| heal.type |
journalArticle |
en |
| heal.publicationDate |
1999 |
en |
| heal.abstract |
The Pleistocene Akrotiri Volcanic Complex (AVC) builds up the southern part of the island of Thera and comprises the oldest volcanic rocks of the Santorini volcanic islands with ages probably ranging from 1.6 to 0.5 Ma. The lower volcanic sequence starts mainly with rhyodacitic magmas, continuing with the production of heterogeneous dacites and terminating this first cycle with andesites. The rhyodacitic magmas are results of fractional crystallisation of amphibole- and plagioclase-rich cumulates from a water-bearing basaltic melt with island arc characteristics. The andesitic to dacitic magmas, in contrast, are mainly products of mechanical mixing (mingling) between rhyodacitic and basaltic to andesitic melts. These differentiation processes can be inferred from phenocryst and xenocryst chemistry as well as from basic to intermediate inclusions, which occur in various proportions in the dacitic and rhyodacitic lavas. The inclusions are interpreted as undercooled and quenched ('pillowed') products, which were formed by injection of vapor-rich hybrid-melts of basaltic to andesitic composition into cooler dacitic to rhyodacitic magmas. Such injections are seen as trigger mechanism, which started the ascent of silicic magmas from deep-seated crustal magma reservoirs. The upper and younger volcanic sequence of the AVC is composed of high-alumina basalts and basaltic andesites and erupted after a period of magmatic quiescence. Complete magma mixing is present in the late Pleistocene Cape Mavrorachidi eruptive centre, producing cinder, scoriae and lavas of basaltic andesite composition. Textural patterns and mineral chemistry of the larger phenocrysts (xenocrysts) exhibit significant evidence of magma mixing between an evolved andesitic melt and a basaltic melt. |
en |
| heal.journalName |
Schweizerische Mineralogische und Petrographische Mitteilungen |
en |
| dc.identifier.issue |
2 |
en |
| dc.identifier.volume |
79 |
en |
| dc.identifier.spage |
231 |
en |
| dc.identifier.epage |
262 |
en |