A high-resolution record of the Matuyama-Brunhes transition from the Mediterranean region: The Valle di Manche section (Calabria, Southern Italy)

Macrı́, Patrizia; Capraro, Luca; Ferretti, Patrizia; Scarponi, Daniele

doi:10.1016/j.pepi.2018.02.005

Cited by 16 publications

(32 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Geomagnetic field structure during the M-B geomagnetic reversal has also been intensively studied (e.g., Hartl and Tauxe 1996;Brown et al 2004;Singer et al 2005Singer et al , 2019Raisbeck et al 2006;Sagnotti et al 2014Sagnotti et al , 2016Balbas et al 2018;Macri et al 2018). Paleomagnetic records from several marine sediments and lavas, and numerical model simulations, show that the polarity switch spans several thousand years depending on site location (e.g., Channell and Guydo 2004;Channell et al 2010;Clement 2004;Singer et al 2005;Amit et al 2010;Olson et al 2011;).…”

Section: Introductionmentioning

confidence: 99%

A full sequence of the Matuyama–Brunhes geomagnetic reversal in the Chiba composite section, Central Japan

Haneda

Okada

Suganuma

et al. 2020

Prog Earth Planet Sci

View full text Add to dashboard Cite

Geological records of the Matuyama–Brunhes (M–B) geomagnetic reversal facilitate the development of an age model for sedimentary and volcanic sequences and help decipher the dynamics of the Earth’s magnetic field. However, the structure of the geomagnetic field during the M–B geomagnetic reversal remains controversial due to its complex field behavior. In this study, we conducted paleo- and rock-magnetic analyses of samples from the Chiba composite section (CbCS), a continuous and expanded marine succession in Central Japan, to reconstruct the full sequence of the M–B geomagnetic reversal. We define an average stratigraphic position of the M–B boundary and estimate its age based on three sections in the CbCS and a neighboring drill core, TB-2. The average stratigraphic position of the M–B boundary in the CbCS is established at 1.1 ± 0.3 m above a widespread volcanic ash bed (the Byk-E tephra). Assuming a chronological error associated with orbital tuning of 5 kyr and stratigraphic uncertainty of 0.4 kyr, the M–B boundary in CbCS is at 772.9 ± 5.4 ka (1σ). The virtual geomagnetic pole, which is calculated from the paleomagnetic directions, shows several short fluctuations between 783 and 763 ka, with concomitant decreases in geomagnetic field intensity index. After termination of the field instabilities, the field intensity recovered and became higher than before the M–B boundary, with a stable normal polarity direction. The paleomagnetic records in the CbCS exhibit a field asymmetry between the axial dipole decay and field recovery, providing a full sequence of the M–B reversal, suggesting that the non-axial dipole field dominated several times during periods ca. 20 kyr long across the M–B boundary, due to depletion in the main axial dipole component. Our results provide probably the most detailed sedimentary record of the M–B geomagnetic reversal and offer valuable information to further understand the mechanism and dynamics of geomagnetic reversals. Graphical abstract

show abstract

Section: Introductionmentioning

confidence: 99%

A full sequence of the Matuyama–Brunhes geomagnetic reversal in the Chiba composite section, Central Japan

Haneda

Okada

Suganuma

et al. 2020

Prog Earth Planet Sci

View full text Add to dashboard Cite

show abstract

“…2, Extended Data Table 2) and deposition of V3 during glacial conditions of MIS 20 60 . The Pitagora ash from the Crotone basin is found in a similar magneto-and climatostratigraphic position 55,61,62 , but differs geochemically from OH-DP-2898/SUL2-22.…”

Section: Extendedmentioning

confidence: 94%

Mediterranean winter rainfall in phase with African monsoons during the past 1.36 million years

Wagner

Vogel

Francke

et al. 2019

Nature

148

195

View full text Add to dashboard Cite

“…Red stars with error bars: Volcanic ages with uncertainties. (1) Sagnotti et al (2014), (2) Niespolo et al (2017), (3) Simon et al (2017), (4) Macrì et al (2018), (5) Nowaczyk, Haltia, et al (2013), (6) using the cores recovered from six parallel holes. The upper 448 m are composed of muddy sediments, which vary in composition on glacialinterglacial timescales Wagner et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

“…Even more surprising than the large age range are the markedly different estimates on the durations of the MB transition. The most rapid postulated reversal was evidenced at sites in Italy (Macrì et al, 2018;Sagnotti et al, 2014;Sagnotti et al, 2016) and high-resolution sites from the Japan Sea (Hyodo et al, 2006;Hyodo & Kitaba, 2015), while much longer durations are found in sediment cores from the Indian and Atlantic Oceans (Figure 1). Biases of estimated ages in sediments result from uncertainties in the age constraints, unknown lock-in depths, and unknown processes of remanence acquisition (Sagnotti, 2018;Sagnotti et al, 2005;Valet & Fournier, 2016).…”

Section: Introductionmentioning

confidence: 98%

Recordings of Fast Paleomagnetic Reversals in a 1.2 Ma Greigite‐Rich Sediment Archive From Lake Ohrid, Balkans

et al. 2019

View full text Add to dashboard Cite

State‐of‐the‐art paleoclimate research strongly depends on the availability of time‐equivalent markers as chronological control to disentangle interrelationships in the climate system from regional to global scale. Geomagnetic reversals are regarded as excellent age constraints because they are global events and independent from climatic conditions. However, spatial variations of timing and internal dynamics of reversals may limit their precision. Our 1.2 Ma high‐resolution (~25 cm/kyr) sediment record from Lake Ohrid is promising to precisely depict the Matuyama‐Brunhes (MB) reversal and the Jaramillo subchron. Two generations of diagenetic ferrimagnetic minerals are present in glacial intervals of the Lake Ohrid record. Early diagenetic greigite acquired a quasi synsedimentary chemical magnetization, while a late diagenetic greigite formation, triggered by the upward diffusion of H2S‐rich waters, obscures the polarity record at the top of the Jaramillo. Interglacial intervals are unaffected by greigite formation, likely due to low iron concentrations. Based on an orbitally tuned age model with tephrostratigraphic markers, the base of Jaramillo can be precisely dated to 1072.4 ka, and the MB reversal to 778.5 ka. Both polarity reversals occurred very rapidly in our record, lasting 2.3 and 1 kyr, respectively. Our results reveal that the dipole component of the Earth's magnetic field fell below the nondipole components only for a short duration in the Mediterranean region. The comparison of the timing of the MB boundary across different archives implies that the onset of the reversal provides a more synchronous age marker compared to often used midpoint ages.

show abstract

A high-resolution record of the Matuyama-Brunhes transition from the Mediterranean region: The Valle di Manche section (Calabria, Southern Italy)

Cited by 16 publications

References 84 publications

A full sequence of the Matuyama–Brunhes geomagnetic reversal in the Chiba composite section, Central Japan

A full sequence of the Matuyama–Brunhes geomagnetic reversal in the Chiba composite section, Central Japan

Mediterranean winter rainfall in phase with African monsoons during the past 1.36 million years

Recordings of Fast Paleomagnetic Reversals in a 1.2 Ma Greigite‐Rich Sediment Archive From Lake Ohrid, Balkans

Contact Info

Product

Resources

About