globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-013-0919-z
论文题名:
U-Pb zircon dating and nature of metavolcanics and metarkoses from the Monte Grighini Unit: New insights on Late Ordovician magmatism in the Variscan belt in Sardinia, Italy
作者: Cruciani G.; Franceschelli M.; Musumeci G.; Spano M.E.; Tiepolo M.
刊名: International Journal of Earth Sciences
出版年: 2013
卷: 102, 期:8
起始页码: 2077
结束页码: 2096
语种: 英语
英文关键词: Ordovician magmatism ; Sardinia ; U/Pb zircon geochronology ; Variscan chain
Scopus关键词: calc alkaline rock ; geochronology ; Hercynian orogeny ; magmatism ; metavolcanic rock ; Ordovician ; Paleozoic ; reconstruction ; tectonic evolution ; uranium-lead dating ; zircon ; Italy ; Sardinia
英文摘要: In the external units of the Sardinian Variscides Nappe Zone, volcanic and volcanoclastic successions of Middle Ordovician age follow Lower Paleozoic calc-alkaline magmatism developed at the northern Gondwana margin. We present geochemical and zircon U-Pb isotopic data for the Truzzulla Formation, a low-to-medium-grade metamorphic volcanic-volcanoclastic succession belonging to the Monte Grighini Unit, the deepest unit in the Nappe Zone. Geochemical and radiometric data allow us to define a Late Ordovician (Katian) magmatic (volcanic) event of calc-alkaline affinity. These new data, in conjunction with previously published data, indicate that in the Sardinian Variscides, the age of Lower Paleozoic Andean-type calc-alkaline magmatism spans from Middle to Late Ordovician. Moreover, the age distribution of calc-alkaline volcanics and volcanoclastic rocks in the Nappe Zone is consistent with a diachronous development of Middle-Late Ordovician Andean-type magmatic arc through the portion of the northern Gondwanian margin now represented by the Sardinian Variscides. This reconstruction of the Sardinian Variscides reflects the complex magmatic and tectonic evolution of the northern margin of Gondwana in the Lower Paleozoic. © 2013 Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885936400&doi=10.1007%2fs00531-013-0919-z&partnerID=40&md5=eb016a3f603ce7fec792c2dc40892894
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70496
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Dipartimento di Scienze Chimiche e Geologiche, Università di Cagliari, Cagliari, Italy; Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy; Sezione di Pavia, CNR, Istituto di Geoscienze e Georisorse, Pavia, Italy

Recommended Citation:
Cruciani G.,Franceschelli M.,Musumeci G.,et al. U-Pb zircon dating and nature of metavolcanics and metarkoses from the Monte Grighini Unit: New insights on Late Ordovician magmatism in the Variscan belt in Sardinia, Italy[J]. International Journal of Earth Sciences,2013-01-01,102(8)
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