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all geography including DSDP/ODP Sites and Legs
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Europe
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Southern Europe
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Italy
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Apennines
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Southern Apennines (2)
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Apulia Italy
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Gargano (1)
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Campania Italy (1)
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Molise Italy (1)
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commodities
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petroleum (2)
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geologic age
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Mesozoic
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Maiolica Limestone (1)
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Triassic (1)
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Primary terms
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diagenesis (1)
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Europe
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Southern Europe
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Italy
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Apennines
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Southern Apennines (2)
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Apulia Italy
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Gargano (1)
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Campania Italy (1)
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Molise Italy (1)
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fractures (2)
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geology (2)
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Mesozoic
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Maiolica Limestone (1)
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Triassic (1)
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petroleum (2)
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plate tectonics (1)
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sedimentary rocks
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carbonate rocks
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dolostone (1)
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limestone
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micrite (1)
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sedimentation (1)
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structural analysis (2)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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dolostone (1)
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limestone
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micrite (1)
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GeoRef Categories
Era and Period
Book Series
Date
Availability
A THREE-STEP VIEW FOR THE HISTORY OF GEOLOGY Available to Purchase
Dolomitization impact on fracture density in pelagic carbonates: contrasting case studies from the Gargano Promontory and the Southern Apennines (Italy) Available to Purchase
The role of stratabound fractures for fluid migration pathways and storage in well-bedded carbonates Available to Purchase
Multiple Dolomitization Episodes In Deep-Water Limestones of the Triassic Lagonegro Basin (Southern Italy): From Early Reflux To Tectonically Driven Fluid Flow Available to Purchase
The neglected early history of Geology: The Copernican Revolution as a major advance in understanding the Earth: COMMENT Open Access
The Upper Triassic platform margin facies of Southern Apennines and their Jurassic fate; state of the art Free
An Early Jurassic submarine scarp in the western Matese Mountains Free
Base Metal Ores in the Lower Paleozoic of Southwestern Sardinia Available to Purchase
Abstract The Iglesiente-Sulcis area in southwestern Sardinia is one of the oldest mining districts in the world, with production dating to pre-Roman times. Exploitation in the district was initially for lead-silver-copper deposits and later for zinc and barium deposits. Most of the deposits occur within Lower Cambrian carbonates and, to a minor degree, in Upper Ordovician metasedimentary rocks. The ores can be subdivided into pre-Hercynian (stratiform/stratabound Zn>Pb>Ba) and post-Hercynian (Pb-Ba-Ag-Cu skarn, vein, paleokarst) deposits. The pre-Hercynian deposits have significantly greater economic importance relative to the post-Hercynian ores. Among the Cambrian-hosted ores, a group of variably graded, syngenetic-early diagenetic massive sulfides (pyrite≫sphalerite≫galena) and barite layers are located at the top of the Nebida Group, where there is a transition from terrigenous clastic rocks to shallow water dolomites. Deposition of these metal sulfides is related to onset of strong tensional tectonics during the Cambrian, which also isolated the carbonate platform. A second group of ores, with a greater Pb/Zn ratio and less pyrite, occurs as void-filling, breccia cement and as late diagenetic replacement bodies in lagoonal limestones of the overlying upper Gonnesa Group, below semi permeable calcareous slates of Middle Cambrian age. Economically less significant Ordovician-hosted deposits (Ba≫Pb) are associated with silicification of host rocks. This mineralization occurs as irregular, void fillings and replacement bodies along an angular unconformity between Cambrian carbonates and Upper Ordovician conglomerates and slates. The metals for the pre-Hercynian stratabound ores were derived from a crustal source, with the lead belonging to the same isotopie province as the lead in the mineral deposits of the southern Alps, Austro-alpine nappes, southern France and northern Spain. Sulfur in barite and sulfides is believed to be derived from a marine, variably reduced, lower Paleozoic sulfate source. Strontium in the Cambrian-hosted barite is believed to share similar source rocks. However, Sr in Ordovician-hostcd barite has a much greater range of values, indicating a distinct episode of mineralization. Other than later (syn- to post-Hercynian) remobilization of ores, ore deposits in the southwestern Sardinian district can be regarded as the result of a combination of favorable sedimentary environments with Cambrian and Ordovician-Silurian tensional tectonics. In fact, most ores are enriched along important tectonic lines which controlled the distribution of the sedimentary facies during the Lower Paleozoic. These tectonic lines have been reactivated many times up to the present.