The Early Triassic magmatism of the Alto ParaguayProvince, Central South America: Paleomagneticand ASM data

Ernesto, Márcia; Comin-Chiaramontí, P.; Gomes, Celso B.

doi:10.1515/geo-2015-0022

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…South American paleomagnetic poles. (a) Paleomagnetic poles positions of ages from Carboniferous to Triassic times, where 1‐Ernesto et al (); 2, 3, 8‐Domeier, Van der Voo, Tomezzoli, et al (); 4‐Gilder et al (); 5‐Yokoyama et al (); 6‐Rapalini et al (); 7‐Domeier, Van der Voo, Tohver, et al (); 9, 12‐Rapalini and Vilas (); 10, 11‐Geuna and Escosteguy (); 13‐Rakotosolofo et al (); 14‐Franco, Ernesto, et al (); 15‐Brandt et al (); 16‐this study; 17‐Geuna et al (); 18, 19‐Jesinkey et al (). The numbering follows the sequence from Table S4 (supporting information).…”

Section: Mafra and Other South American Paleomagnetic Polesmentioning

confidence: 99%

“…The set of PPs plotted in Figure and listed in Table S4 from the supporting information was based on the compilation done by Domeier et al () and some new results from Ernesto et al (), Franco, Ernesto, et al (), and Yokoyama et al (). Poles from 9 to 19 are reverse polarity and are assigned to the Kiaman superchron interval [~318 to 262 Ma; Opdyke & Channell, ].…”

Section: Mafra and Other South American Paleomagnetic Polesmentioning

confidence: 99%

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New Late Pennsylvanian Paleomagnetic Results From Paraná Basin (Southern Brazil): Is the Recent Giant Gaussian Process Model Valid for the Kiaman Superchron?

et al. 2019

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The most recent Giant Gaussian Process (GGP) model, based on the last 5 Ma, has been used as a reference for directional distribution of paleomagnetic record of older rocks as Cenozoic and Proterozoic. However, for Paleozoic times, its validity has not yet been tested. Here we evaluate the validity of this recent GGP model for the Kiaman superchron. We present new paleomagnetic results from a late Pennsylvanian section of glacial rhythmites (Mafra Formation) from southern Brazil. The 5-m section sampled spans more than 800 kyr, as evaluated by cyclostratigraphic analysis. Thermal demagnetization revealed a reversed characteristic component carried by single domain magnetite. Anisotropy of anhysteretic remanent magnetization indicated a small shallowing correction of f = 0.97. The final paleomagnetic pole position is located at 51.9°S, 344.3°E (N = 111, R = 109.0, K = 55.9, A 95 = 1.8°), with a mean direction of Dec = 144.2°, Inc = 69.5°(N = 111, R = 110.2, k = 134.4, α 95 = 1.2°, Paleolat = 53.2°S). The shape of the distribution of magnetization directions (elongation E = 2:08 3:13 1:44 Þ and the dispersion of virtual geomagnetic poles (S V ¼ 10:9 11:8 9:8 Þ are incompatible with the recent model. The reduced dispersion, also found in other studies, implies a different shape in directional distributions for any GGP model describing the Kiaman interval. This result alerts us that we should abandon the use of the recent GGP model as a reference for inclination shallowing correction of Carboniferous sedimentary data.

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Section: Mafra and Other South American Paleomagnetic Polesmentioning

confidence: 99%

Section: Mafra and Other South American Paleomagnetic Polesmentioning

confidence: 99%

New Late Pennsylvanian Paleomagnetic Results From Paraná Basin (Southern Brazil): Is the Recent Giant Gaussian Process Model Valid for the Kiaman Superchron?

et al. 2019

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“…Recently published results for the Permo-Triassic from South America and South Africa [Domeier et al, 2011a[Domeier et al, , 2011bLanci et al, 2013;Yokoyama et al, 2014;Ernesto et al, 2015;Tohver et al, 2015] add new information from igneous and flattening-corrected rocks. This group shows a tight cluster of PPs.…”

Section: Late Permian-early Triassic ($269-245 Ma)mentioning

confidence: 99%

A pure dipole analysis of the Gondwana apparent polar wander path: Paleogeographic implications in the evolution of Pangea

Gallo

Tomezzoli

Cristallini

2017

Geochem Geophys Geosyst

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The paleogeography of prebreakup Pangea at the beginning of the Atlantic Spreading has been a subject of debate for the past 50 years. Reconciling this debate involves theoretical corrections that cast doubt on available data and paleomagnetism as an effective tool for performing paleoreconstructions. This 50 year old debate focuses specifically on magnetic remanence and its ability to correctly record the inclination of the paleomagnetic field. In this paper, a selection of paleopoles was made to find the great circles containing the paleomagnetic pole and the respective sampling site. The true dipole pole (TDP) was then calculated by intersecting these great circles, effectively avoiding nondipolar contributions and inclination shallowing, in an innovative method. The great circle distance between each of these TDPs and the paleomagnetic means show the accuracy of paleomagnetic determinations in the context of a dominantly geocentric, axial, and dipolar geomagnetic field. The TDPs calculated allowed a bootstrap analysis to be performed to further consider the flattening factor that should be applied to the sedimentary‐derived paleopoles. It is argued that the application of a single theoretical correction factor for clastic sedimentary‐derived records could lead to a bias in the paleolatitude calculation and therefore to incorrect paleogeographic reconstructions. The unbiased APWP makes it necessary to slide Laurentia to the west in relation to Gondwana in a B‐type Pangea during the Upper Carboniferous, later evolving, during the Early Permian, to reach the final A‐type Pangea configuration of the Upper Permian.

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“…Ernesto et al [20] investigate the palaeomagnetic characteristics of alkaline igneous complexes in the Alto Paraguay Province (APP) at the border of Paraguay and Brazil. The age of the APP is well constrained within the range 240-250 Ma (preferred age 241 Ma).…”

Section: Papers Presentedmentioning

confidence: 99%

A Special Issue (Part-II): mafic-ultramafic rocks andalkaline-carbonatitic magmatism and associated hydrothermalmineralization – dedication to Lia N. Kogarko

Gwalani¹,

Rogers²,

Stoppa

et al. 2015

Open Geosciences

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The Early Triassic magmatism of the Alto ParaguayProvince, Central South America: Paleomagneticand ASM data

Cited by 6 publications

References 23 publications

New Late Pennsylvanian Paleomagnetic Results From Paraná Basin (Southern Brazil): Is the Recent Giant Gaussian Process Model Valid for the Kiaman Superchron?

New Late Pennsylvanian Paleomagnetic Results From Paraná Basin (Southern Brazil): Is the Recent Giant Gaussian Process Model Valid for the Kiaman Superchron?

A pure dipole analysis of the Gondwana apparent polar wander path: Paleogeographic implications in the evolution of Pangea

A Special Issue (Part-II): mafic-ultramafic rocks andalkaline-carbonatitic magmatism and associated hydrothermalmineralization – dedication to Lia N. Kogarko

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