Gabbro-derived Granulites from the Northern Apennines (Italy): Evidence for Lower-crustal Emplacement of Tholeiitic Liquids in Post-Variscan Times期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Gabbro-derived Granulites from the Northern Apennines (Italy): Evidence for Lower-crustal Emplacement of Tholeiitic Liquids in Post-Variscan Times

Authors:	MONTANINI A; TRIBUZIO R

Institution:	¹DIPARTIMENTO DI SCIENZE DELLA TERRA, UNIVERSITÀ DI PARMA, PARCO AREA DELLE SCIENZE 157A, I-43100 PARMA, ITALY ²DIPARTIMENTO DI SCIENZE DELLA TERRA, UNIVERSITÀ DI PAVIA, VIA FERRATA 1, 27100 PAVIA, ITALY ³CNR–CENTRO DI STUDIO PER LA CRISTALLOCHIMICA E LA CRISTALLOGRAFIA, VIA FERRATA 1, I-27100 PAVIA, ITALY

Abstract:	The mafic granulites from the Northern Apennines commonly containsignificant amounts of either olivine or Fe–Ti-oxide phases.On the basis of mineralogy and whole-rock major and trace elementcompositions, their protoliths are recognized as cumulus rocksderived from variably evolved tholeiitic liquids. Clinopyroxenesfrom the olivine-bearing rocks show peculiar trace element compositions(e.g. low amounts of Cr, Zr and lanthanides, coupled with relativelyhigh Sr concentrations) that record a process of granulite-faciestrace element redistribution controlled by a reaction betweenolivine and plagioclase. The trace element compositions of clinopyroxenesfrom the Fe–Ti-oxide-bearing rocks point to igneous geochemicaltrends that argue for a common igneous parentage. The

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