109 documents found, page 1 of 11
Evolution of a Neoproterozoic suture in the Iberian Massif, Central Portugal: i...
Neiva, A.M.R.; Dunning, G. R.; Tajčmanová, Lucie; Henriques, S.B.A.ABSTRACT: The existence of the late Neoproterozoic supercontinent Pannotia (ca. 650-540 Ma) is controversial. Several proxies for supercontinent assembly and break-up have been recognized. Global orogeny and granitoid magmatism, detrital zircon and monazite age peaks and extreme conditions of metamorphism are some of the proxies pointed out for supercontinent assembly. The amalgamation of Pannotia was accompani...
Evolution of a Neoproterozoic suture in the Iberian Massif, Central Portugal: i...
Neiva, A.M.R.; Dunning, G. R.; Tajčmanová, Lucie; Henriques, S.B.A.ABSTRACT: The existence of the late Neoproterozoic supercontinent Pannotia (ca. 650-540 Ma) is controversial. Several proxies for supercontinent assembly and break-up have been recognized. Global orogeny and granitoid magmatism, detrital zircon and monazite age peaks and extreme conditions of metamorphism are some of the proxies pointed out for supercontinent assembly. The amalgamation of Pannotia was accompani...
Variscan Magmatism. In: Quesada C., Oliveira J. (eds) The Geology of Iberia: A ...
Ribeiro, M.L.; Castro, A.; Almeida, A.; Menéndez, L.G.; Jesus, A.; Lains, J.A.; Lopes, J.C.; Martins, M.H.B.; Mata, J.; Mateus, A.; Moita, P.This chapter aims to identify, characterize and locate the main facts/events related to orogenesis in the Iberian Peninsula. Its succession in space and time determines the geodynamic environment of the broader geological phenomenon corresponding to the Variscan cycle. In this sense, this section comprises two parts: I—The Iberian orogenic magmatism seen through a space-time approach of its westernmost region—f...
Assessment of metal and metalloid contamination in soils trough compositional d...
Neiva, A.M.R.; Albuquerque, M.T.D.; Antunes, I.M.H.R.; Carvalho, Paula; Santos, A.C.T.; Boente, Carlos; Cunha, Pedro Proença; Henriques, S.B.A.Soils from the old Mortórios uranium mine area were studied to look for contamination, as they are close to two villages, up to 3 km away, and used for agriculture. They are mainly contaminated in U and As and constitute an ecological threat. This study attempts to outline the degree to which soils have been affected by the old mining activities through the computation of significant hot clusters, Traditional g...
Assessment of metal and metalloid contamination in the waters and stream sedime...
Neiva, A.M.R.; Carvalho, Paula; Antunes, I.M.H.R.; Albuquerque, M.T.D.; Santos, António; Cunha, Pedro Proença; Henriques, S.B.A.In the abandoned Mortórios uranium mine area there are quartz veins containing wolframite and sulphides and basic rock dykes with torbernite and autunite cutting a porphyritic granite. The basic rock dykes were exploited and produced about 27 t of U3O8, from 1982 to 1988. There are an open pit lake and nine dumps. Surface water and groundwater are contaminated in U, As, Cd, Cr, Cu, Fe, Mn, Ni and Pb. Stream sed...
Assessment of metal and metalloid contamination in the waters and stream sedime...
Neiva, A.M.R.; Carvalho, P.C.S.; Antunes, I. Margarida H. Ribeiro; Albuquerque, M.T.D.; Santos, A.C.S.; Cunha, Pedro Proença e; Henriques, S.B.A.ABSTRACT: In the abandoned Mortórios uranium mine area there are quartz veins containing wolframite and sulphides and basic rock dykes with torbernite and autunite cutting a porphyritic granite. The basic rock dykes were exploited and produced about 27 t of U3O8, from 1982 to 1988. There are an open pit lake and nine dumps. Surface water and groundwater are contaminated in U, As, Cd, Cr, Cu, Fe, Mn, Ni and Pb. ...
Assessment of metal and metalloid contamination in soils trough compositional d...
Neiva, A.M.R.; Albuquerque, M.T.D.; Antunes, I. Margarida H. Ribeiro; Carvalho, P.C.S.; Santos, A. C. T.; Boente, C.; Cunha, Pedro Proença eABSTRACT: Soils from the old Mortórios uranium mine area were studied to look for contamination, as they are close to two villages, up to 3 km away, and used for agriculture. They are mainly contaminated in U and As and constitute an ecological threat. This study attempts to outline the degree to which soils have been affected by the old mining activities through the computation of significant hot clusters, Tra...
Geochemistry and metamorphism of the Mouriscas Complex, Ossa-Morena/Central Ibe...
Henriques, S.B.A.; Neiva, A.M.R.; Tajcmanová, L.; Dunning, G. R.ABSTRACT: The Mouriscas Complex is a deformed and metamorphosed predominantly mafic igneous complex of Ediacaran and Ordovician age and crops out at the Ossa-Morena/Central Iberian zone boundary in the Iberian Massif, Central Portugal. It comprises amphibolite with Neoproterozoic protoliths (ca. 544 Ma), protomylonitic felsic dykes derived from younger trondhjemitic protoliths (ca. 483 Ma) and garnet amphibolit...
Spatial surface and groundwater interaction in an abandoned radium-bearing mine...
Antunes, I.M.H.R.; Neiva, A.M.R.; Albuquerque, M.T.D.; Santos, A.C.T.The abandoned Alto da Várzea radium mine exploited quartz veins containing ore minerals and U-bearing minerals, such as autunite and torbernite. The area is located on a Variscan two-mica granite that intruded the schist–greywacke complex. The mine was exploited underground from 1911-22 and was closed down in 1946. This mine was not restored and actually a commercial area is deployed.A total of ten surface wate...
Potential toxic elements in stream sediments, soils and waters in an abandoned ...
Antunes, I.M.H.R.; Neiva, A.M.R.; Albuquerque, M.T.D.; Carvalho, Paula; Santos, A.C.T.; Cunha, Pedro ProençaThe Alto da Várzea radium mine (AV) exploited ore and U-bearing minerals, such as autunite and torbernite. The mine was exploited underground from 1911 to 1922, closed in 1946 without restoration, and actually a commercial area is deployed. Stream sediments, soils and water samples were collected between 2008 and 2009. Stream sediments are mainly contaminated in As, Th, U and W, which is related to the AV radiu...