Alcuni aspetti petrologici delle ofioloti delle Albanidi  [Petrologic aspects of Albanide ophiolites]

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Alternate Title:Petrologic aspects of Albanide ophiolites
Authors:Cassli, H.; Cina, A.; Gjata, K.; Kodra, A.; Lleshi, B.; Shallo, Minella; Vransi, A.; Zace, M.
Author Affiliations:Primary:
Minist. Ind. Minierave, Tirana, Albania
Fakulteti i Gjeologjise Minierave, Albania
Studimene Projektimene Gjeologo-Minerare, Albania
Volume Title:Ophiolites and actualism; Proceedings of the meeting
Volume Authors:Bortolotti, V., editor
Source:Ofioliti, 7(2-3), p.205-220; Ophiolites and actualism; meeting, Florence, Italy, Dec. 18-19, 1981, edited by V. Bortolotti. Publisher: Pitagora Editrice, Bologna, Italy. ISSN: 0391-2612
Publication Date:1982
Note:In Italian with English summary. 2 p. refs.; illus. incl. 15 anal., 3 tables, geol. sketch map, sect., block diag.
Summary:The Albanide ophiolite (Albania) contains some of the most complete and coherent sequences of Mediterranean ophiolites. The ophiolite is composed of ultrabasic rocks with a continuous transition to gabbro and plagiogranite; in the upper parts mostly spilite-keratophyre volcanic series occur. Sheeted dyke complexes are present in the lower and central parts of the volcanic formations. Pronounced changes in the lithology of the various sections are observed. Ultrabasic rocks are predominant, and consist from bottom to top, of harzburgite, harzburgite-dunite, dunite, wehrlite, lherzolite or plagioclase peridotite and minor pyroxenite. The gabbroic sequence is composed of gabbro-norite, gabbro, amphibole gabbro. At the boundary of the gabbros and volcanic formations, plagiogranite is characterized by extremely calcic plagioclase. Volcanic rocks-basic and intermediate to acidic in composition-constitute the top of the ophiolite. In the lower part, basalt is followed upward by basalt-andesite and quartz keratophyre with calc-alkaline affinity, extremely poor in K2O and oversaturated in silica, by analogy with the plutonic rocks. The Albanide ophiolite was formed during the Jurassic, as a result of spreading between the Korrab-Pelagonia massif to the N and the Apulian plate to the S. Ultrabasic rocks occur in two belts, the eastern belt, mainly composed of harzburgite-dunite, shows similarities of petrological and metallogenical features with eastern Mediterranean ophiolites. The western belt, mostly lherzolitic, is similar to the ophiolites of the western Mediterranean. However in the Albanides these two ophiolitic belts are closely connected both in time and space. The various levels of the ophiolite are characterized by numerous and important ore deposits. A view of the different genetic types of ore deposits according to their geological setting, is presented. [C.N.]
Subjects:Diorites; Gabbros; Granites; Greenstone belts; IGCP; Igneous rocks; Mesozoic; Metamorphic belts; Ophiolite; Petrology; Plagiogranite; Plutonic rocks; Ultramafics; Volcanic rocks; Albania; Albanides; Alps; Europe; Southern Europe; Mineralizations; Vulcanite
Abstract Numbers:87M/5031
Record ID:1985081303
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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