Search Results - "PaCCa, I. G."

Effects of solar activity and galactic cosmic ray cycles on the modulation of the annual average temperature at two sites in southern Brazil by Frigo, Everton, Antonelli, Francesco, da Silva, Djeniffer S. S., Lima, Pedro C. M., Pacca, Igor I. G., Bageston, José V.

“…Quasi-periodic variations in solar activity and galactic cosmic rays (GCRs) on decadal and bidecadal timescales have been suggested as a climate forcing…”
Get full text

Evidence for cosmic ray modulation in temperature records from the South Atlantic Magnetic Anomaly region by Frigo, E., Pacca, I. G., Pereira-Filho, A. J., Rampelloto, P. H., Rigozo, N. R.

“…Possible direct or indirect climatic effects related to solar variability and El Niño–Southern Oscillation (ENSO) were investigated in the southern Brazil…”
Get full text

Petromagnetic characteristics of Cameroon Line volcanic rocks by Ubangoh, R.U., Pacca, I.G., Nyobe, J.B., Hell, J., Ateba, B

“…Volcanic rock samples collected from 154 sites on the Cameroon Line (CL) have been analysed to study their petromagnetic characteristics. Thermomagnetic…”
Get full text

Palaeomagnetism of the continental sector of the Cameroon Volcanic Line, West Africa by Ubangoh, R. U., Pacca, I. G., Nyobe, J. B.

“…Measurement of samples from 154 sites in the continental sector of the Cameroon Volcanic Line yielded six palaeomagnetic poles, at 243.6°E, 84.6°N, α95 = 6.8°;…”
Get full text

The Age of Paraná Flood Volcanism, Rifting of Gondwanaland, and the Jurassic-Cretaceous Boundary by Renne, Paul R., Ernesto, Marcia, Pacca, Igor G., Coe, Robert S., Glen, Jonathon M., Prévot, Michel, Perrin, Mireille

“…The Paraná-Etendeka flood volcanic event produced ×1.5 × 10$^6$ cubic kilometers of volcanic rocks, ranging from basalts to rhyolites, before the separation of…”
Get full text

A palaeomagnetic and 40Ar/39Ar study of late precambrian sills in the SW part of the Amazonian craton: Amazonia in the Rodinia reconstruction by Elming, S.-Å., D'Agrella-Filho, M. S., Page, L. M., Tohver, E., Trindade, R. I. F., Pacca, I. I. G., Geraldes, M. C., Teixeira, W.

“…A new key palaeomagnetic pole (Plat. = 64.3°S, Plon. = 271.0°E, N = 14, A95 = 9.2°; Q = 5) is calculated from a primary magnetization isolated in early…”
Get full text

Late Cretaceous alkaline complexes, southeastern Brazil: Paleomagnetism and geochronology by Montes-Lauar, C.R., Pacca, I.G., Melfi, A.J., Kawashita, K.

“…Late Cretaceous alkaline rocks from Poços de Caldas, Itatiaia, Passa Quatro and São Sebastião Island were studied with the main purpose of improving the South…”
Get full text

Palaeomagnetism of the Itajai, Castro and Bom Jardim groups from southern Brazil by D'Agrella-Filho, M. S., Pacca, I. G.

“…Palaeomagnetic results corresponding to geological units associated with the Brasiliano (Pan-African) cycle (Late Pre-Cambrian - Early Palaeozoic), are…”
Get full text

The 1420 Ma Indiavaí Mafic Intrusion (SW Amazonian Craton): Paleomagnetic results and implications for the Columbia supercontinent by D'Agrella-Filho, Manoel S., Trindade, Ricardo I.F., Elming, Sten-Åke, Teixeira, Wilson, Yokoyama, Elder, Tohver, Eric, Geraldes, Mauro C., Pacca, Igor I.G., Barros, Marcia A.S., Ruiz, Amarildo S.

“…The configuration and the timing of assembly and break-up of Columbia are still matter of debate. In order to improve our knowledge about the Mesoproterozoic…”
Get full text

Tectonic implications of the 1419 Ma Nova Guarita mafic intrusives paleomagnetic pole (Amazonian Craton) on the longevity of Nuna by Bispo-Santos, Franklin, D’Agrella-Filho, Manoel S., Trindade, Ricardo I.F., Elming, Sten-åke, Janikian, Liliane, Vasconcelos, Paulo M., Perillo, Bruno M., Pacca, Igor I.G., Silva, Jesué A. da, Barros, Márcia A.S.

“…The Nuna supercontinent was probably assembled in the Paleoproterozoic, but its paleogeography and the timing for its demise are still a matter of debate. A…”
Get full text

The significance of the palaeomagnetism of Jurassic—Cretaceous rocks from South America: predrift movements, hairpins and magnetostratigraphy by Valencio, D. A., Vilas, J. F., PaCCa, I. G.

“…In this paper we show that: (1) The positions of the Cretaceous palaeomagnetic poles (PP) for South America and Africa exhibit elongated distributions that are…”
Get full text

Direct dating of paleomagnetic results from Precambrian sediments in the Amazon craton: Evidence for Grenvillian emplacement of exotic crust in SE Appalachians of North America by D'Agrella-Filho, Manoel S., Tohver, Eric, Santos, João O.S., Elming, Sten-Åke, Trindade, Ricardo I.F., Pacca, Igor I.G., Geraldes, Mauro C.

“…We apply a new diagenetic dating technique to determine the age of magnetization for Precambrian sedimentary rocks in the SW Amazon craton. Two new…”
Get full text

Columbia revisited: Paleomagnetic results from the 1790 Ma colider volcanics (SW Amazonian Craton, Brazil) by Bispo-Santos, Franklin, D’Agrella-Filho, Manoel S., Pacca, Igor I.G., Janikian, Liliane, Trindade, Ricardo I.F., Elming, Sten-Ake, Silva, Jesué A., Barros, Márcia A.S., Pinho, Francisco E.C.

“…In an attempt to improve our understanding of the Paleoproterozoic geodynamic evolution, a paleomagnetic study was performed on 10 sites of acid volcanic rocks…”
Get full text

Spectral analysis of Permocarboniferous geomagnetic variation data from glacial rhythmites by Ernesto, M., Pacca, I. G.

“…Palaeomagnetic results for a sequence of Permocarboniferous rhythmites presented in the previous paper have been submitted to maximum entropy spectral analysis…”
Get full text

Preliminary Palaeomagnetic Study of Igneous Rocks from Abrolhos Islands, Brazil by PACCA, I. G, VALENCIO, D. A

“…THERE are few palaeomagnetic data on Cainozoic rocks from the South American block1-4, and these data refer to the Upper Cainozoic. The geological information…”
Get full text

A palaeomagnetic and 40 Ar/ 39 Ar study of late precambrian sills in the SW part of the Amazonian craton: Amazonia in the Rodinia reconstruction by Elming, S.-Å., D'Agrella-Filho, M. S., Page, L. M., Tohver, E., Trindade, R. I. F., Pacca, I. I. G., Geraldes, M. C., Teixeira, W.

Get full text

A palaeomagnetic and Ar-40/Ar-39 study of late precambrian sills in the SW part of the Amazonian craton: Amazonia in the Rodinia reconstruction by Elming, Sten-åke, D'Agrella-Filho, M.S., Page, L.M., Tohver, E., Trindade, R. I. F., Pacca, I.I.G., Geraldes, M.C., Teixeira, W.

“…A new key palaeomagnetic pole (Plat. = 64.3°S, Plon. = 271.0°E, N = 14, A95= 9.2°; Q = 5) is calculated from a primary magnetization isolated in early…”
Get full text

Spectral analysis of Pennocarboniferous geomagnetic variation data from glacial rhythmites by Ernesto, M., Pacca, I. G.

“…Palaeomagnetic results for a sequence of Permocarboniferous rhythmites presented in the previous paper have been submitted to maximum entropy spectral analysis…”
Get full text

Paleomagnetic Constraints on the Rodinia Supercontinent: Implications for its Neoproterozoic Break-up and the Formation of Gondwana by D'agrella-Filho, Manoel S., Trindade, Ricardo I. F., Siqueira, Roberto, Ponte-Neto, Cosme F., Pacca, Igor I. G.

“…An interpretation of available paleomagnetic data from the Laurentia, Congo-Sao Francisco, Kalahari, and Amazonia cratons favors the hypothesis that these…”
Get full text

Paleomagnetism of Paleoproterozoic mafic dyke swarm from the Uauá region, northeastern São Francisco Craton, Brazil: tectonic implications by Filho, M.S.D'agrella, Pacca, I.I.G.

“…This paper presents paleomagnetic analyses of 146 samples collected from 45 mafic dykes (sites) and 18 samples from basement rocks in contact with dykes. Two…”
Get full text