Abstract
Field and petrographical descriptions of some volcanic rocks occurring at two outcrops in the Lucanian Apennine (Southern Italy) are reported. The volcanic rocks, belonging to the ophiolite complex of Alpine age present in this area, are represented chiefly by pillow lavas, among which several types may be distinguished structurally, by auto-clastic lavas and volcanoclastic rocks. A Tithonian age is inferred for the pillow lavas associated with a polygenic sedimentary breccia. The mineralogy and fabric of the volcanic rocks are characteristically spilitic. Besides spilites, diabases, of probable hypabyssal occurrence, are also recorded. Some data about the spilite-forming minerals (particularly the chlorites) and four chemical analyses of spilites are reported. The variations in mineral and chemical composition exhibited by spilites are discussed and interpreted as chiefly dependent on the primary features of the extruded lavas. Furthermore, differences between spilites and some intrusive diabases and a gabbro occurring within the same area and in a similar tectonic position are pointed out. A causal relationship between spilitization and a volcanic occurrence is inferred, together with a probable primary origin of the actual essential petrographical features of the spilites. Effects of metamorphic alteration in some volcanic rocks, doubtfully referred to as medium grade burial metamorphism, and in associated sedimentary rocks are pointed out. The extent and importance of this alteration with regard to the petrogenesis of the spilites is, however, very uncertain.
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Spadea, P. (1974). Spilites of the Lucanian Apennine (Southern Italy). In: Amstutz, G.C. (eds) Spilites and Spilitic Rocks. International Union of Geological Sciences, vol 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88230-2_16
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DOI: https://doi.org/10.1007/978-3-642-88230-2_16
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