Age of the Mono Lake excursion and associated tephra

Benson, Larry; Liddicoat, Joseph C.; Smoot, Joseph P.; Sarna-Wojcicki, Andrei M.; Negrini, Robert M.; Lund, Steve P.

doi:10.1016/s0277-3791(02)00249-4

Cited by 82 publications

(66 citation statements)

References 22 publications

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“…Evidence of the Younger Dryas cold event is not observed in the rock magnetic signature between 10 and 15 ka, where the k ARM record shows a gradual increase contrasting to the Greenland ice core isotope record. As mentioned before, the Mono Lake excursion was suggested to correspond to a paleointensity low at about 32 ka (Benson et al, 2003). It was also reported that a peak of 36 Cl concentration occurs between the D-O events 6 and 7 at about 32 ka in the GRIP ice core (Wagner et al, 2000).…”

Section: Environmental Magnetic Recordmentioning

confidence: 66%

“…Kent et al (2002) and Zimmerman et al (2006) suggested that the anomalous paleomagnetic feature at Mono Lake is correlative with the Laschamp excursion at about 41 cal kyr BP. On the other hand, Benson et al (2003) showed that the excursion is dated at about 32 cal kyr BP and correlated with a paleointensity low in the NAPIS-75 record . It is therefore important to delineate the geomagnetic field variation corresponding to the excursion around 32 ka in widely distributed locations.…”

Section: Inclination (°)mentioning

confidence: 98%

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Environmental magnetic record and paleosecular variation data for the last 40 kyrs from the Lake Biwa sediments, Central Japan

et al. 2007

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We have conducted paleomagnetic and environmental magnetic analysis of a sediment piston core recovered from Lake Biwa, central Japan. Tephrochronology and AMS radiocarbon dating showed that this core covers the time period since about 40 kyr BP. The variation of paleomagnetic direction shows a good agreement with the PSV record for the last 10 kyrs from the deeper water site (BIWA SV-3; Ali et al., 1999), although the amplitudes are subdued probably due to the relatively lower accumulation rate at the shallower site. Inclination lows of the pre-Holocene interval are correlated to PSV records reported from the marine sediments off Shikoku and in the Japan Sea. In addition, the variation of magnetic mineral concentration reflects environmental changes during the last glacial period. It is suggested that the flux of fine-grained magnetite, probably associated with greater precipitation, was increased during interstadial periods. The variation of anhysteretic remanent magnetization is likely correlated to the Dansgaard-Oeschger (D-O) cycles recorded in Greenland ice cores. An apparent swing of the PSV curve is recognized at about 27 ka, but evidence for the Mono Lake excursion at 32 ka around the D-O events 6 and 7 is unclear. Combination of the detailed paleomagnetic record and the sub-Milankovitch climate cycles thus provides better resolution for understanding geomagnetic secular variation and polarity excursions in space and time.

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Section: Environmental Magnetic Recordmentioning

confidence: 66%

Section: Inclination (°)mentioning

confidence: 98%

Environmental magnetic record and paleosecular variation data for the last 40 kyrs from the Lake Biwa sediments, Central Japan

et al. 2007

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“…If the latter is the case, the ND, SU, and WU groups occurred at about 29, 50 and 55 ka, respectively, although the interval between the ages of the SU and WU groups (approx. 5000 years) is not much more than estimated durations for geomagnetic excursions (1500-2000 years; Benson et al, 2003;Laj et al, 2006).…”

Section: The Ages Of the Auckland Excursionsmentioning

confidence: 84%

“…Two well-established excursions in this interval are the Laschamp excursion reported from the lava flows in France (Bonhommet and Zäringer, 1969), dated at 40.4±2.0 ka (2σ ) (Guillou et al, 2004), and the Mono Lake excursion identified from lake sediments in western North America (Denham and Cox, 1971), dated at approximately 30 ka (Benson et al, 2003). These two distinct excursions are considered to have occurred at 30 and 40 ka, respectively, although a few researchers have noted that the Mono Lake excursion at the original locality may be a record of the Laschamp excursion (Kent et al, 2002;Zimmerman et al, 2006).…”

Section: Introductionmentioning

confidence: 88%

Further K-Ar dating and paleomagnetic study of the Auckland geomagnetic excursions

et al. 2007

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Three different excursional paleomagnetic directions were reported from eight volcanoes of the Auckland volcanic field in New Zealand: north-down (ND) directions obtained from five volcanoes, west-up (WU) from two volcanoes, and south-up (SU) from one volcano. K-Ar ages have been reported for two of these volcanoes: 27±5 (1σ ) ka for the Wiri volcano of the ND group and 55±5 ka for the Hampton Park volcano of the WU group. In the present study, we have carried out further K-Ar age determinations on three other volcanoes and obtained reliable ages for two of them: 30±5 ka for the Puketutu volcano of the ND group and 50±6 ka for the McLennan Hills volcano of the SU group. The age of Puketutu agrees well with that of Wiri, and these two ages give a weighted mean age of 29±3 (1σ ) ka for the ND group. The age of the ND group is distinguishable from those of the SU and WU groups at the 2σ level, confirming that excursions occurred at two different times separated by a few tens of thousands of years. The age of the SU group is indistinguishable from that of the WU group, and a weighted mean age of 53±4 ka can be calculated for this combined group (SU-WU group). The age of the ND group and that of the SU-WU group are distinguishable from the latest age estimate of the Laschamp excursion. Overall, these age data from volcanic rocks show that at least three excursions occurred between approximately 30 and 60 ka. These three excursions are likely to be confined in the weak dipole interval of 20-70 ka, and all of these excursions yield particularly low virtual dipole moments (VDMs) of 2×10 22 A m 2 or less. Since it is suggested that the larger virtual geomagnetic pole (VGP) deviations from the geographic pole are related to the lower VDMs, the excursional fields possibly have resulted from a significantly reduced dipole field and comparable non-dipole components.

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“…Both these well-documented excursions are generally agreed to have inclination anomalies with durations of about 1,500 years [e.g., Laj et al, 2000;Teanby et al, 2002;Benson et al, 2003]. Given the similarity of paleodirections for the five Auckland volcanoes and the rarity and short duration of excursions, it seems highly unlikely that more than one excursion event has been recorded.…”

Section: Discussionmentioning

confidence: 99%

Geomagnetic excursion captured by multiple volcanoes in a monogenetic field

Cassidy¹

2006

Geophysical Research Letters

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[1] Five monogenetic volcanoes within the Quaternary Auckland volcanic field are shown to have recorded a virtually identical but anomalous paleomagnetic direction (mean inclination and declination of 61.7°and 351.0°, respectively), consistent with the capture of a geomagnetic excursion. Based on documented rates of change of paleomagnetic field direction during excursions this implies that the volcanoes may have all formed within a period of only 50-100 years or less. These temporally linked volcanoes are widespread throughout the field and appear not to be structurally related. However, the general paradigm for the reawakening of monogenetic fields is that only a single new volcano or group of closely spaced vents is created, typically at intervals of several hundred years or more. Therefore, the results presented show that for any monogenetic field the impact of renewed eruptive activity may be significantly under-estimated, especially for potentially affected population centres and the siting of sensitive facilities.

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Age of the Mono Lake excursion and associated tephra

Cited by 82 publications

References 22 publications

Environmental magnetic record and paleosecular variation data for the last 40 kyrs from the Lake Biwa sediments, Central Japan

Environmental magnetic record and paleosecular variation data for the last 40 kyrs from the Lake Biwa sediments, Central Japan

Further K-Ar dating and paleomagnetic study of the Auckland geomagnetic excursions

Geomagnetic excursion captured by multiple volcanoes in a monogenetic field

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