PmagPy: Software package for paleomagnetic data analysis and a bridge to the Magnetics Information Consortium (MagIC) Database

Tauxe, Lisa; Shaar, Ron; Jonestrask, L.; Swanson‐Hysell, Nicholas L.; Minnett, R.; Koppers, Anthony A. P.; Constable, Catherine; Jarboe, N. A.; Gaastra, Kevin; Fairchild, Luke M.

doi:10.1002/2016gc006307

Cited by 236 publications

(230 citation statements)

References 32 publications

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“…Subsequently, the samples were progressively step-heated and thermally demagnetized in an ASC thermal specimen demagnetizer (residual fields <10 nT). Following acquisition of the data, principal component analysis (Kirschvink, 1980) was conducted using the PmagPy software package (https:// github.com /PmagPy; Tauxe et al, 2016). All measurement level data as well as interpreted specimen directions are available within the MagIC database (https:// earthref.org /MagIC /doi /10.1130 /L580.1).…”

Section: Paleomagnetism Methodsmentioning

confidence: 99%

The end of Midcontinent Rift magmatism and the paleogeography of Laurentia

et al. 2017

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Paleomagnetism of the North American Midcontinent Rift provides a robust paleogeographic record of Laurentia (cratonic North America) from ca. 1110 to 1070 Ma, revealing rapid equatorward motion of the continent throughout rift magmatism. Existing age and paleomagnetic constraints on the youngest rift volcanic and sedimentary rocks have been interpreted to record a slowdown of this motion as rifting waned. We present new paleomagnetic and geochronologic data from the ca. 1090-1083 Ma "late-stage" rift volcanic rocks exposed as the Lake Shore Traps (Michigan), the Schroeder-Lutsen basalts (Minnesota), and the Michipicoten Island

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Section: Paleomagnetism Methodsmentioning

confidence: 99%

The end of Midcontinent Rift magmatism and the paleogeography of Laurentia

et al. 2017

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“…In all experiments, the field during "in-field cooling" in the oven was 60 μT. Data analysis was done with the Thellier graphical user interface (GUI) program (21), which is part of PmagPy software (22), using the automatic interpretation technique described in detail in Shaar et al (4,23). The acceptance criteria follow Shaar et al (4) and are described with references in SI Appendix.…”

Section: Significancementioning

confidence: 99%

Six centuries of geomagnetic intensity variations recorded by royal Judean stamped jar handles

Ben‐Yosef

Millman

Shaar

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Earth's magnetic field, one of the most enigmatic physical phenomena of the planet, is constantly changing on various time scales, from decades to millennia and longer. The reconstruction of geomagnetic field behavior in periods predating direct observations with modern instrumentation is based on geological and archaeological materials and has the twin challenges of (i) the accuracy of ancient paleomagnetic estimates and (ii) the dating of the archaeological material. Here we address the latter by using a set of storage jar handles (fired clay) stamped by royal seals as part of the ancient administrative system in Judah (Jerusalem and its vicinity). The typology of the stamp impressions, which corresponds to changes in the political entities ruling this area, provides excellent age constraints for the firing event of these artifacts. Together with rigorous paleomagnetic experimental procedures, this study yielded an unparalleled record of the geomagnetic field intensity during the eighth to second centuries BCE. The new record constitutes a substantial advance in our knowledge of past geomagnetic field variations in the southern Levant. Although it demonstrates a relatively stable and gradually declining field during the sixth to second centuries BCE, the new record provides further support for a short interval of extreme high values during the late eighth century BCE. The rate of change during this "geomagnetic spike" [defined as virtual axial dipole moment > 160 ZAm 2 (10 21 Am 2 )] is further constrained by the new data, which indicate an extremely rapid weakening of the field (losing ∼27% of its strength over ca. 30 y).archaeomagnetism | archaeointensity | levantine archaeomagnetic curve | paleosecular variation | archaeomagnetic spikes R econstruction of geomagnetic secular variation during the Holocene has implications for various fields of research, from geophysics and other planetary sciences to biology and archaeology. Such reconstructions are based predominantly on heatimpacted geological and archaeological materials, whose thermal remanent magnetization (TRM) holds information on the geomagnetic field vector at the time of their last cooling. As evidence for fluctuating field behavior, including short (decadal) periods of rapid changes, is constantly growing (1-5), using records with excellent time resolution has become increasingly of interest.To improve the accuracy and precision of age constraints associated with estimates of ancient geomagnetic field strength, the current study exploits a set of archaeological artifacts whose ages are exceptionally well constrained. This set is composed of wellstudied ceramic jars from Judah/Yehud/Judea (Jerusalem and its vicinity), which bear royal stamp impressions on their handles (6-10). The stamped jars were part of the ancient administration of this region for about 600 y, between the late eighth and late second centuries BCE. As the types of stamp impressions changed with time according to the political situation, the jar handles provide an excellent recor...

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“…by Tauxe et al (2016) were adopted. These criteria are established based on paleointensity study on modern lava flows in Hawaii where the historical field can be reproduced with reasonable accuracy (Cromwell et al, 2015).…”

Section: Compilation Of Published Archeomagnetic Data From Chinamentioning

confidence: 99%

Recent Advances in Chinese Archeomagnetism

et al. 2017

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The geomagnetic field is one of Earth's fundamental properties with a history of ∼3.5 Gyr. The field, generated in Earth's core is a window to the deep interior of Earth and may have played a key role in evolution of life on our planet. Materials on Earth's surface that contain magnetic minerals can record information about the geomagnetic field in which they formed. Fired archeological materials (e.g., pottery, brick, and burnt clay) are favorable recorders of the field, and have been widely employed to recover geomagnetic variations over periods of hundreds to thousands of years. The longevity of Chinese civilization and the abundant nature of archeological artifacts make Chinese archeomagnetism a promising source of data. The main work of Chinese archeomagnetism was carried out in the 1980s and 90s, followed by a break of more than a decade; in the 2010s activity resumed. In this paper, we review the development of Chinese archeomagnetism, including a summary of previous work, recent progress, remaining issues and future studies with the aim of promoting an understanding of archeomagnetic work in China and to guide the way for future studies. Here, we compile published data, including some data discovered in old publications that have not yet been included in paleomagnetic databases. We also establish the first, albeit preliminary, archeomagnetic reference curves (with 42 declination / inclination pairs and 76 / 192 archeointensities) for the geomagnetic field in China (ArchInt_China.1a / ArchInt_China.1b, ArchDec_China.1, ArchInc_China.1), which can be used for global comparison of the field and regional archeomagnetic dating.

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PmagPy: Software package for paleomagnetic data analysis and a bridge to the Magnetics Information Consortium (MagIC) Database

Cited by 236 publications

References 32 publications

The end of Midcontinent Rift magmatism and the paleogeography of Laurentia

The end of Midcontinent Rift magmatism and the paleogeography of Laurentia

Six centuries of geomagnetic intensity variations recorded by royal Judean stamped jar handles

Recent Advances in Chinese Archeomagnetism

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