Copper deposits in the basal breccias and volcano-sedimentary sequences of the eastern ligurian ophiolites (Italy)

Ferrario, A.; Garuti, Giorgio

doi:10.1007/bf00202795

Cited by 31 publications

(30 citation statements)

References 8 publications

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“…Those located in the northern Apennine section are particularly relevant because they contain more than 2/3 of the ophiolite-hosted Cu reserves of Italy, and lack the high-P, low-T metamorphic overprint, providing a unique opportunity for the study of primary ore genesis. Schematic stratigraphy of the northern Apennine sulfi de deposits is shown in Figure 6, after Ferrario and Garuti (1980) and Garuti and Zaccarini (2005). Four major structural types can be identifi ed: 1) stratiform ores occurring in the serpentinite breccia, covered by pillow lava; 2) stratiform ores located at the top of the volcanic pile covered with sediments; 3) stratabound deposit located within pillow basalt; 4) sulfi de deposits associated with hydrothermal veins cutting across serepentinite (4a), gabbro (4b) and pillow basalt (4c).…”

Section: The Vms Deposits Of the Northern Apenninementioning

confidence: 99%

“…The most relevant VMS deposits of the InternalLigurides described by Ferrario and Garuti (1980) occur in the northernmost of two ophiolite blocks, the Val Graveglia complex, exposed between the eastern-Liguria Table 2.…”

Section: Sulfi De Deposits In the Internal Liguridesmentioning

confidence: 99%

“…micritic limestone. Notably, basalt fragments are absent, and the ultramafi c blocks are surrounded by a carbonatesiliciclastic sandy matrix showing widespread evidence of sedimentary graded bedding (Ferrario and Garuti, 1980). The size of blocks increases and the amount of interstitial matrix decreases toward the lower contact with massive serpentinite.…”

Section: The Monte Bardeneto -Monte Bianco Minesmentioning

confidence: 99%

“…4) stockwork-vein sulfi de deposits in: a) serpentinite (Vigonzano, Ferriere, Groppallo, Santa Maria), b) gabbro (Campegli), and c) pillow basalt (Casali, Reppia III, Monte Bianco II, Boccassuolo, Montecreto). Redrawn after: Ferrario and Garuti (1980), Garuti and Zaccarini (2005), Zaccarini and Garuti (in press). …”

Section: The Monte Bardeneto -Monte Bianco Minesmentioning

confidence: 99%

“…Despite their economic importance as the unique copper source in Italy, only sporadic information on mineralogy and geology has been provided for single deposits or limited mining areas (Bertolani 1952(Bertolani , 1959(Bertolani , 1962(Bertolani , 1999Ferrario, 1973;Brigo and Ferrario, 1974;Ferrario and Garuti, 1980). The deposits of the northern Apennine have been recently re-examined, providing fi rst data on mineralogy and geochemistry of the sulfi des (Garuti and Zaccarini, 2005;Zaccarini, 2006;Zaccarini and Garuti, in press), as well as preliminary data on chlorite geothermometry (Zaccarini et al, 2003) and sulfur isotope geochemistry (Garuti et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Geological setting and structural styles of Volcanic Massive Sulfide deposits in the northern Apennines (Italy): evidence for seafloor and sub-seafloor hydrothermal activity in unconventional ophiolites of the Mesozoic Tethys

Garuti¹

2008

BSGM

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This paper is an overview of the geological setting and structural styles of Cu-sulfi de deposits of the VMS-type, associated with Tethyan ophiolites (the Ligurides) in the northern Apennines (Italy). The Italian deposits represent a rare example of VMS associated with both the mantle-peridotite basement and the overlaying volcanic pile, within a single ophiolite sequence. This peculiar feature is due to the particular geodynamic evolution of the Mesozoic Ligurian ocean that allowed the upper mantle to be exposed on the seafl oor for a long period before the outfl ow of MORB-type lava and the deposition of pelagic sediments (cherts, Palombini shales and Calpionella limestones). Middle to Upper Jurassic uprising of the basaltic magma initially provided the heath source for convective circulation of hydrothermal fl uids through the overlaying mantle section, giving rise to sulfi de deposition in crosscutting stockworkveins and seafl oor-stratiform ore bodies within the serpentinized mantle peridotite and the serpentinite breccia formed by submarine erosion of the upper mantle. The setting and structure of VMS associated with the volcanic pile indicate that hydrothermal activity continued during and after the eruption of pillow basalts at the ocean fl oor, forming stockwork veins and conformable stratabound ore bodies within the basalt unit. Furthermore, hydrothermal activity formed seafl oor-stratiform deposits, at the top of the volcanic pile, covered with a thick horizon of cherts containing exhalative deposits of Mn.Key words: VMS, geological setting, ophiolite, northern Apennine, Italy. Resumen En este trabajo se presenta una visión general del contexto geológico y estilo estructural de los depósitos volcanogénicos de cobre (VMS), asociados a las ofi olitas del Tethys (Las Ligurides), en los Apeninos del Norte Italia. Los depósitos italianos representan un raro ejemplo de VMS ya que se encuentran asociados a los niveles de peridotitas mantélicas basales, y a las rocas volcánicas superiores dentro de una única secuencia ofi olítica. Esta peculiaridad es debida a la evolución geodinámica del océano Ligurian en el

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Section: The Vms Deposits Of the Northern Apenninementioning

confidence: 99%

Section: Sulfi De Deposits In the Internal Liguridesmentioning

confidence: 99%

Section: The Monte Bardeneto -Monte Bianco Minesmentioning

confidence: 99%

Section: The Monte Bardeneto -Monte Bianco Minesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geological setting and structural styles of Volcanic Massive Sulfide deposits in the northern Apennines (Italy): evidence for seafloor and sub-seafloor hydrothermal activity in unconventional ophiolites of the Mesozoic Tethys

Garuti¹

2008

BSGM

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Tectonic Setting and Origin of Metalliferous Sediments in the Mesozoic Tethys Ocean

Robertson

Boyle

1983

Hydrothermal Processes at Seafloor Spreading Centers

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Hydrothermal alteration and mineralisation of basalts from the spreading zone of the East Pacific Rise (7°S–23°S)

Dill

Gauert²,

Holler

et al. 1992

Geol Rundsch

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Zusammenfassung AbstractAt the southern part of the East Pacific Rise (EPR), between 6~ and 30~ a survey on volcanic and hydrothermal activity was performed and samples were obtained by means of TV-controlled grab.This paper deals with altered and mineralized basalt sampled between 7~ and 23~ from five sites in a hydrothermal field.These basalts of tholeitic composition are vitreous to holocrystaline. They have suffered pervasive alteration during which rock-forming minerals (pyroxene, plagioclase) have been replaced by kaolinite, chlorite and smectite. As a consequence, strong depletion of Ca, Cr, Ni, Mg, Sr and A1 took place, accompanied by an enrichment of Fe, Cu, Co, Mo, Zn, and Pb. The ore mineral assemblage is rather uniform and consists of pyrite, marcasite, wurtzite, sphalerite, chalcopyrite, covellite and goethite.The igneous and hydrothermal activities can be subdivided into different stages: lithification, high-temperature alteration (<400 C), medium to low temperature alteration and two substages of ore formation (250~ -150~ and <150~ respectively).This active present-day ore deposition is interpreted in terms of a peripheral zone of a volcanic-hosted ore mineralisation. It may be compared with fossil ophiolite-hosted massive sulfides that formed throughout the Alpine (e.g. Arabia, Cyprus) as well as Caledonian orogeny (e.g. Scandinavia).

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Copper deposits in the basal breccias and volcano-sedimentary sequences of the eastern ligurian ophiolites (Italy)

Cited by 31 publications

References 8 publications

Geological setting and structural styles of Volcanic Massive Sulfide deposits in the northern Apennines (Italy): evidence for seafloor and sub-seafloor hydrothermal activity in unconventional ophiolites of the Mesozoic Tethys

Geological setting and structural styles of Volcanic Massive Sulfide deposits in the northern Apennines (Italy): evidence for seafloor and sub-seafloor hydrothermal activity in unconventional ophiolites of the Mesozoic Tethys

Tectonic Setting and Origin of Metalliferous Sediments in the Mesozoic Tethys Ocean

Hydrothermal alteration and mineralisation of basalts from the spreading zone of the East Pacific Rise (7°S–23°S)

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