Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra

Suganuma, Yûsuke; Okada, Makoto; Horie, Kenji; Kaiden, H.; Takehara, Mami; Senda, Ryoko; Kimura, Jun–Ichi; Kawamura, Kenji; Haneda, Yuki; Kazaoka, Osamu; Head, Martin J.

doi:10.1130/g36625.1

Cited by 87 publications

(110 citation statements)

References 26 publications

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“…These M-B boundary ages are consistent with the records of cosmogenic nuclides in marine sediments (e.g., Suganuma et al 2010) and an Antarctic ice core (Dreyfus et al 2008). Recently, Suganuma et al (2015) presented a new U-Pb zircon age of 772.7 ± 7.2 ka from a volcanic ash layer just below the M-B boundary in the Chiba composite section (a very rapidly deposited marine sediment) in Japan. This U-Pb zircon age, coupled with an astronomical age for the marine sediment, yields an M-B boundary age of 770.2 ± 7.3 ka.…”

Section: Introductionsupporting

confidence: 66%

“…The predominant silty beds of the Chiba composite section are intensely bioturbated, and there is a lack of evidence for episodic deposition such as slumps or muddy turbidites, although minor sandy beds are intercalated within the silty section, particularly in the lower part of the section (Nishida et al 2016). Marine oxygen isotope records reveal continuous deposition from MIS 21 to MIS 18 with glacial and interglacial cycles corresponding to sandstone-and siltstone-dominated units, respectively (Okada and Niitsuma 1989;Pickering et al 1999;Suganuma et al 2015). The Byk-E tephra is widely distributed in the area and provides an excellent stratigraphic marker for the Lower-Middle Pleistocene boundary in the Chiba composite section .…”

Section: Geology Of the Studied Section And Samplesmentioning

confidence: 99%

“…To determine the grain size, the composition of the magnetic materials, and the stability for thermal demagnetization (ThD) analysis, the following rock-magnetic and paleomagnetic measurements were taken in addition to the previous paleomagnetic studies conducted by Suganuma et al (2015).…”

Section: Paleomagnetic and Rock-magnetic Measurementsmentioning

confidence: 99%

“…2) located at 35°17.66′ N, 140°8.79′ E, which outcrops on the gorge walls of the Yoro-River and along a branch creek of the Yoro-River. The Yoro-River section was used be called as the "Tabuchi" section Nishida et al 2016;Suganuma et al 2015). Since we newly investigated and sampled from the section along a branch creek of the Yoro-River, we named the section as "Yoro-Tabuchi" section and renamed the Tabuchi section as "Yoro-River" section.…”

Section: Geology Of the Studied Section And Samplesmentioning

confidence: 99%

“…The samples for paleomagnetic (thin horizontal bars) and oxygen isotope analyses (light blue squares) are from the Yoro-River and the Yoro-Tabuchi sections in this study. The sample horizons shown on the Yanagawa and Kokusabata sections and the "TBH" series for the paleomagnetic studies on the Yoro-River section were used by Suganuma et al (2015) magnetometer (SRM-760R; 2G Enterprises, USA) installed in a magnetically shielded room at the National Institute of Polar Research (NIPR). Stepwise alternating field demagnetization (AFD) was performed in 2.5-to 10-mT increments up to 80 mT using an AF demagnetizer with a set of static 3-axis AF coils installed on the magnetometer.…”

Section: Paleomagnetic and Rock-magnetic Measurementsmentioning

confidence: 99%

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Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan

Okada

Suganuma

Haneda

et al. 2017

Earth Planets Space

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106

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The youngest geomagnetic polarity reversal, the Matuyama-Brunhes (M-B) boundary, provides an important plane of data for sediments, ice cores, and lavas. The geomagnetic field intensity and directional changes that occurred during the reversal also provide important information for understanding the dynamics of the Earth's outer core, which generates the magnetic field. However, the reversal process is relatively rapid in terms of the geological timescale; therefore, adequate temporal resolution of the geomagnetic field record is essential for addressing these topics. Here, we report a new high-resolution paleomagnetic record from a continuous marine succession in the Chiba composite section of the Kokumoto Formation of the Kazusa Group, Japan, that reveals detailed behaviors of the virtual geomagnetic poles (VGPs) and relative paleointensity changes during the M-B polarity transition. The resultant relative paleointensity and VGP records show a significant paleointensity minimum near the M-B boundary, which is accompanied by a clear "polarity switch. " A newly obtained high-resolution oxygen isotope chronology for the Chiba composite section indicates that the M-B boundary is located in the middle of marine isotope stage (MIS) 19 and yields an age of 771.7 ka for the boundary. This age is consistent with those based on the latest astronomically tuned marine and ice core records and with the recalculated age of 770.9 ± 7.3 ka deduced from the U-Pb zircon age of the Byk-E tephra. To the best of our knowledge, our new paleomagnetic data represent one of the most detailed records on this geomagnetic field reversal that has thus far been obtained from marine sediments and will therefore be key for understanding the dynamics of the geomagnetic dynamo and for calibrating the geological timescale.

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Section: Introductionsupporting

confidence: 66%

Section: Geology Of the Studied Section And Samplesmentioning

confidence: 99%

Section: Paleomagnetic and Rock-magnetic Measurementsmentioning

confidence: 99%

Section: Geology Of the Studied Section And Samplesmentioning

confidence: 99%

Section: Paleomagnetic and Rock-magnetic Measurementsmentioning

confidence: 99%

See 3 more Smart Citations

Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan

Okada

Suganuma

Haneda

et al. 2017

Earth Planets Space

Self Cite

106

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Deciphering records of geomagnetic reversals

Valet

Fournier

2016

Rev. Geophys.

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Polarity reversals of the geomagnetic field are a major feature of the Earth's dynamo. Questions remain regarding the dynamical processes that give rise to reversals and the properties of the geomagnetic field during a polarity transition. A large number of paleomagnetic reversal records have been acquired during the past 50 years in order to better constrain the structure and geometry of the transitional field. In addition, over the past two decades, numerical dynamo simulations have also provided insights into the reversal mechanism. Yet despite the large paleomagnetic database, controversial interpretations of records of the transitional field persist; they result from two characteristics inherent to all reversals, both of which are detrimental to an ambiguous analysis. On the one hand, the reversal process is rapid and requires adequate temporal resolution. On the other hand, weak field intensities during a reversal can affect the fidelity of magnetic recording in sedimentary records. This paper is aimed at reviewing critically the main reversal features derived from paleomagnetic records and at analyzing some of these features in light of numerical simulations. We discuss in detail the fidelity of the signal extracted from paleomagnetic records and pay special attention to their resolution with respect to the timing and mechanisms involved in the magnetization process. Records from marine sediments dominate the database. They give rise to transitional field models that often lead to overinterpret the data. Consequently, we attempt to separate robust results (and their subsequent interpretations) from those that do not stand on a strong observational footing. Finally, we discuss new avenues that should favor progress to better characterize and understand transitional field behavior.

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An integrated natural remanent magnetization acquisition model for the Matuyama‐Brunhes reversal recorded by the Chinese loess

Jin

Liu

et al. 2016

Geochem Geophys Geosyst

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Geomagnetic polarity reversal boundaries are key isochronous chronological controls for the long Chinese loess sequences, and further facilitate paleoclimatic correlation between Chinese loess and marine sediments. However, owing to complexity of postdepositional remanent magnetization (pDRM) acquisition processes related to variable dust sedimentary environments on the Chinese Loess Plateau (CLP), there is a long‐standing dispute concerning the downward shift of the pDRM recorded in Chinese loess. In this study, after careful stratigraphic correlation of representative climatic tie points and the Matuyama‐Brunhes boundaries (MBB) in the Xifeng, Luochuan, and Mangshan loess sections with different pedogenic environments, the downward shift of the pDRM is semiquantitatively estimated and the acquisition model for the loess natural remanent magnetization (NRM) is discussed. The measured MB transition zone has been affected by the surficial mixing layer (SML) and remagnetization. Paleoprecipitation is suggested to be the dominant factor controlling the pDRM acquisition processes. Rainfall‐controlled leaching would restrict the efficiency of the characterized remanent magnetization carriers aligning along the ancient geomagnetic field. We conclude that the MBB in the central CLP with moderate paleoprecipitation could be considered as an isochronous chronological control after moderate upward adjustment. A convincing case can then be made to correlate L8/S8 to MIS 18/19.

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Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra

Cited by 87 publications

References 26 publications

Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan

Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan

Deciphering records of geomagnetic reversals

An integrated natural remanent magnetization acquisition model for the Matuyama‐Brunhes reversal recorded by the Chinese loess

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