气候变化领域集成服务门户(CCPortal): Petrogenesis of the Solanas gabbro-granodiorite intrusion; Sàrrabus (southeastern Sardinia; Italy): implications for Late Variscan magmatism

CCPortal

DOI	10.1007/s00531-019-01689-8
	Petrogenesis of the Solanas gabbro-granodiorite intrusion; Sàrrabus (southeastern Sardinia; Italy): implications for Late Variscan magmatism
	Franciosi L.; D’Antonio M.; Fedele L.; Guarino V.; Tassinari C.C.G.; de Gennaro R.; Cucciniello C.
发表日期	2019
ISSN	14373254
起始页码	989
结束页码	1012
卷号	108 期号:3
英文摘要	The igneous complex of Solanas is a small, composite calc-alkaline intrusion emplaced at ~ 300 Ma in the Sàrrabus region (southeastern Sardinia), and consists of olivine gabbronorites, amphibole gabbros, microgabbros, quartz diorites, tonalites, amphibole granodiorites, and biotite granodiorites. Thermobarometry calculations indicate that the Solanas rocks were emplaced at mid-to-upper crustal levels (0.6–4.0 kbar). The intermediate and silicic rocks are metaluminous to weakly peraluminous and are enriched in large ion lithophile elements. The range in the initial Sr and Nd isotopic compositions is small throughout the intrusion despite a large range in silica contents (46.3–73.6 wt% SiO2). The isotopic signatures, mineralogy, and geochemistry suggest that the quartz diorites, tonalites, and granodiorites derived from fractional crystallisation and crustal contamination processes starting from different mafic parental magmas. The origin of tonalites and granodiorites is compatible with removal of plagioclase, hornblende, biotite, apatite and zircon starting from a quartz dioritic magma. The mafic rocks range in composition from primitive to relatively evolved (Mg# 49–70). The olivine gabbronorites and amphibole gabbros have petrographic and geochemical features of arc cumulates derived from different basaltic magmas. The microgabbros have geochemical characteristics similar to high-alumina basalts with fractionated rare-earth element patterns (LaN/YbN = 4.3–6.0), enrichment in large ion lithophile elements (e.g., Rb, Ba, U, and K) and depletion in Nb and Ta compared with the primitive mantle. These characteristics are consistent with partial melting of a mantle source that was enriched by subduction-related fluids. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Crustal contamination; Fractional crystallisation; Geochemistry; Late Variscan magmatism; Mineral chemistry; Solanas gabbro-granodiorite intrusion
语种	英语
scopus关键词	crustal contamination; enrichment; fractional crystallization; gabbro; granodiorite; Hercynian orogeny; igneous geochemistry; igneous intrusion; isotopic composition; magmatism; petrogenesis; Italy; Sardinia
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147849
作者单位	Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), Università degli Studi di Napoli Federico II, Via Vicinale Cupa Cintia 21, Naples, 80126, Italy; Departamento de Mineralogia e Geotectônica, Universidade de São Paulo, Rua do Lago, 562, Cidade Universitária, São Paulo, CEP 05508-900, Brazil
推荐引用方式 GB/T 7714	Franciosi L.,D’Antonio M.,Fedele L.,et al. Petrogenesis of the Solanas gabbro-granodiorite intrusion; Sàrrabus (southeastern Sardinia; Italy): implications for Late Variscan magmatism[J],2019,108(3).
APA	Franciosi L..,D’Antonio M..,Fedele L..,Guarino V..,Tassinari C.C.G..,...&Cucciniello C..(2019).Petrogenesis of the Solanas gabbro-granodiorite intrusion; Sàrrabus (southeastern Sardinia; Italy): implications for Late Variscan magmatism.International Journal of Earth Sciences,108(3).
MLA	Franciosi L.,et al."Petrogenesis of the Solanas gabbro-granodiorite intrusion; Sàrrabus (southeastern Sardinia; Italy): implications for Late Variscan magmatism".International Journal of Earth Sciences 108.3(2019).