TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Mineralogic, Structural and Petrogenetic Considerations on the Igneous Acid Rocks
(Universitatea Petrol-Gaze din Ploieşti, Bd. Bucureşti 39, Ploieşti e-mail: mihai_c@bigstring.com)
Vol LX • No. 2/2008
Mihai Ciocīrdel
Universitatea Petrol-Gaze din Ploieşti, Bd. Bucureşti 39, Ploieşti
e-mail: mihai_c@bigstring.com

 Keywords   petrography, igneous rocks, Sebeş Massif

 Abstract
Over 250 small bodies of acid, dike-like rocks, cross-cut and/or follow the main metamorphic foliation in the Northern part of the Sebes Massif. Their spatial distribution suggests a close relationship with the Cărpiniş-Cāpălna formation, also called "the Răşinari Shear-Zone? (RSZ). This paper presents the results of the microscopic study of one of these bodies, situated on the Sebeş valley, at about 3 km south from the Căpālna locality. The microscopic study revealed the presence of different small xenoliths, the recurrent zoning of plagioclase and the digestion of quartz. These features suggest that magma generating the studied petrographic body suffered contamination and even possible assimilation during its ascent, these processes modifying the composition of the melt during crystallization. The spatial relationship with the RSZ suggests that the emplacement of the bodies was structurally controlled and possibly even generated by the activity of the shear zone.

 Rezumat
Peste 250 de mici corpuri tip dyke de rocă magmatică acidă, taie şi/sau sunt dispuse concordant cu principala foliaţie metamorfică īn partea de nord a Masivului Sebeş. Distribuţia lor spaţială sugerează o strānsă relaţie cu formaţiunea de Cărpiniş-Căpālna, de asemenea numită ?Zona de Forfecare Răşinari? (ZFR). Această lucrare prezintă rezultatele studiului microscopic al unuia din aceste corpuri situat pe Valea Sebeşului, la aprox. 3 Km S de localitatea Căpālna. Studiul microscopic a evidenţiat prezenţa a unor mici xenolite, zonalitatea recurentă a plagioclazului şi resorbţia magmatică a cuarţului. Aceste trăsături sugerează că magma care a generat corpul petrografic studiat a suferit contaminare şi chiar o posibilă asimilare īn timpul ascensiunii sale, aceste procese modificāndu-i compoziţia īn timpul cristalizării. Relaţia spaţială cu ZFR sugerează că punerea īn loc a corpurilor a fost controlată din punct de vedere structural şi chiar generată de activitatea zonei de forfecare.



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