Inicio > Ciencias de la tierra, geografía, medioambiente, planificación > Ciencias de la tierra/geociencias > Geología y la litosfera > Skały zasadowe z Texenny (północno-wschodnia Algieria)
Skały zasadowe z Texenny (północno-wschodnia Algieria)

Skały zasadowe z Texenny (północno-wschodnia Algieria)

Safia Saouli

72,27 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2026
Materia
Geología y la litosfera
ISBN:
9786630413687
72,27 €
IVA incluido
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Niniejsze badania petrograficzne, metalogeniczne i geochemiczne dotyczą bazowych skał oceanicznych kompleksu wulkaniczno-osadowego Texenna (Mała Kabylia, Algieria) w porównaniu z zachodnim orogenem perimediterrańskim. Analiza 13 preparatów cienkich i 3 przekrojów wypolerowanych pozwala wyróżnić cztery facje (lawy poduszkowe, bazalty porfirowe, dolerity, gabro). Lawy poduszkowe (~250 m) mają rozmiary od 0,5 do 3 m. Intensywna spilitizacja (facies zielonych łupków do amfibolitów) spowodowała pseudomorfozę minerałów pierwotnych w chloryt, aktynot, epidot, albit i kalcyt, z teksturalną strefowością. Mineralizacja rozproszona obejmuje piryt, chalkopiryt, pirhotyt, kowelit, hematyt, chromit i magnetyt, co świadczy o obiegu hydrotermalnym. Pierwiastki główne wykazują wysoką mobilność (SiO₂: 19-55%; MgO: 0,09-12,82%). Pierwiastki nieruchome (Zr: 324 ppm) oraz stosunki pierwiastków śladowych (Ta/Nb = 0,07; Ta/La = 0,05) potwierdzają pokrewieństwo od typu N-MORB do T-MORB. Anomalie Rb, Zr i Pb wskazują na zanieczyszczenie skorupowe. Skały z Texenna stanowią relikty skorupy oceanicznej Tetydu, spójne z ofiolitami śródziemnomorskimi.

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