ΜΕΤΑΛΛΟΓΕΝΕΣΗ ΣΥΜΠΑΓΩΝ ΘΕΙΟΥΧΩΝ ΜΕΤΑΛΛΕΥΜΑΤΩΝ ΚΑΙ ΠΕΤΡΟΛΟΓΙΑ ΤΗΣ ΕΞΩΤΕΡΙΚΗΣ ΜΕΤΑΜΟΡΦΙΚΗΣ ΤΕΚΤΟΝΙΚΗΣ ΖΩΝΗΣ ΤΩΝ ΕΛΛΗΝΙΔΩΝ (Ν.Α. ΠΕΛΟΠΟΝΝΗΣΟΣ)

CONSIDERATION OF THE GEOLOGICAL, MINERALOGICAL, GEOCHEMICAL AND STRATIGRAPHIC CHARACTERISTICS OF THE STUDIED SEGMENT OF THE EXTERNAL METAMORPHIC BELT OF THEHELLENIDES IN SE PELOPONNESUS, LEAD TO THE FOLLOWING CONCLUSIONS: 1. THE ROCKS OF THE "TYROS BEDS" HAVE SUFFERED A VERY LOW GRADE METAMORPHISM. THE TEMPERATURE OF METAMORPHISM IS ESTIMATED TO HAVE BEEN ABOUT 320-350 C AND THE PRESSURE ABOUT 2 KB. 2. THE VOLCANIC ROCKS OF THE "TYROS BEDS" ARE CALC-ALKALINE AND RANGE FROM BASALTIC ANDESITES TO ANDESITES. THEY ARE PRODUCTS OF VOLCANISM CLOSELY RELATED TO A SUBDUCTION ZONE. THE PYROCLASTICS ARE WIDESPEAD WHEREAS THELAVAS-OFTEN PORPHYRITIC-ARE NOT. 3. THE VOLCANIC ROCKS OF THE "TYROS BEDS" WERE HYDROTHERMALLY ALTERED DURING THE VOLCANISM. THIS ALTERATION WAS SIMILAR TOTHAT OF HYDROTHERMAL TERRAINS AT SITES OF SUBMARINE VOLCANISM, WHICH IS A RESULT OF THE INTERACTION BETWEEN SEA WATER AND VOLCANIC ROCK. 4. THE ORE OCCURRENCES IN THE STUDIED AREA, HOSTED IN THE "TYROS BEDS", CAN BE DIVIDED ACCORDINGTO THEIR MINERALOGY, MODE OF OCCURRENCE AND TYPE OF ENVELOPING ROCKS INTO TWOMAIN GROUPS: THE FIRST GROUP INCLUDES PB-ZN-FE-CU SULFIDE ASSEMBLAGES IN VOLCANIC ROCKS AND IS CONSIDERED TO BE OF EPIGENETIC ORIGIN. THE SECOND GROUP INCLUDES GALENA AND BARITE IN CARBONATE ROCKS. THE FIRST GROUP CAN BE FURTHER SUBDIVIDED INTO TWO MORPHOLOGICAL TYPES: THE FIRST INCLUDES DISSEMINATED CU WITH MINOR FE SULFIDE ASSEMBLAGES IN PORPHYRITIC VOLCANIC ROCKS, WHEREAS THE SECONDTYPE INCLUDES PB-ZN-FE- CU SULFIDE ASSEMBLAGES IN STOCKWORK FORM SPATIALLY RELATED TO QUARTZ- CHLORITE-SERICITE ALTERED BRECCIAS. (SHORTENED)

Grantor dc:publisher

National and Kapodistrian University of Athens

Year dc:date

1983

Authors dc:creator

• Skarpelis, Nikolaos
• Σκαρπέλης, Νίκος

• Γεωλογία
• ΗΦΑΙΣΤΙΤΕΣ
• ΚΥΑΝΟΣΧΙΣΤΟΛΙΘΟΙ
• Μεταλλογένεση
• Πετρολογία
• Blueschists
• Geochemistry
• Geology
• METALLOGENY
• Petrology

Language dc:language

gre

Identifier

10.12681/eadd/0532

OAI identifier oai:identifier

oai:10442/0532