Paleomagnetism and dating of a thick lava pile in the Permian Bakaly formation of eastern Kazakhstan: Regularities and singularities of the paleomagnetic record in thick lava series

Abstract

2016-12-23T18:37:48

Consistent and Contrasting Aspects of the Geomagnetic Field Across Epochs With Distinct Reversal Frequencies Revealed by Modeling the Kiaman Superchron

“… Rotation and grouping of directions and VGPs. (a) An example of a data set (Bazhenov et al., 2016). (b) Grouping paleodirections and VGPs from the paleolatitude band of 30°N –40°N.…”

“…Available paleomagnetic data sets of Kiaman igneous rocks spanning the longest times exhibit smaller elongations than in the TK03 model. However, the high uncertainties make the results inconclusive (Bazhenov et al., 2016; Haldan et al., 2014). Brandt et al.…”

“…Available paleomagnetic data sets of Kiaman igneous rocks spanning the longest times exhibit smaller elongations than in the TK03 model. However, the high uncertainties make the results inconclusive (Bazhenov et al, 2016;Haldan et al, 2014). Brandt et al (2019) made another attempt using sedimentary records and observed that the recent-field TK03 model is incompatible with the VGP scatter of the three Kiaman data sets they analyzed.…”

Behavior of the Paleosecular Variation During the Permian‐Carboniferous Reversed Superchron and Comparisons to the Low Reversal Frequency Intervals Since Precambrian Times

“…The differences between the best fit Model G curve fittings for both lithologies could be explained by a number of different reasons, as follows: (i) possible effects related to the PSV record in sedimentary rocksfor instance, by smoothing effects (due to factors such as sedimentation rate, grain size, sediment accommodation time, and subsequent consolidation (Kruiver et al, 2002), that may lead to attenuation of the geomagnetic record); (ii) ''flattening'' (shallowing) effect, which could result in significant deviations in paleolatitude estimates. Shallowing corrections using anisotropy of remanence (first proposed by Jackson et al, 1991) or the method from Tauxe and Kent (2004) were employed in only a few works from our selection (e.g., Brandt et al, 2009Brandt et al, , 2016Franco et al, 2012;Haldan et al, 2009); and (iii) igneous rocks provide geologically instantaneous records of the paleomagnetic field (Johnson & McFadden, 2007), which according to several authors (e.g., Bazhenov et al, 2016;Biggin et al, 2008b;Johnson et al, 2008;Veikkolainen & Pesonen, 2014) probably provide more reliable PSV estimates than those provided by sedimentary rocks. Therefore, the best fit Model G curve fitting for the igneous data set would best represent the S(k) trending patterns for the PCRS.…”

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

“…Attempts to test the validity of TK03.GAD for Kiaman times were done with two groups of paleomagnetic data from long sections of igneous records (Bazhenov et al, 2016;Haldan et al, 2014). Both results presented distributions with elongation smaller than that predicted by TK03.GAD model, but because of high values of uncertainty on elongation results, the analyses of those results on their own were not conclusive.…”