Paleointensity record from Pleistocene sediments (1.4–0 Ma) off the California Margin

Guyodo, Yohan; Richter, Carl; Valet, Jean‐Pierre

doi:10.1029/1999jb900163

Cited by 59 publications

(50 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sensitivity of rock magnetic parameters to climatic variations in marine sediments has allowed them to be used to establish age models for cores, where independent dating was not available, by correlating a rock magnetic parameter to an appropriate climatic target curve (i.e. reference oxygen isotopic curve or astronomical solutions; see Robinson, 1986;Guyodo et al, 1999). Variability in the concentration and composition of magnetic material in the marine environment is controlled by changes in sediment source and mode of transport, in addition to diagenetic e¡ects and production of biogenic magnetite (Bloemendal et al, 1992).…”

Section: The Climatic Rock Magnetic ¢Ngerprint In Cores Lc07 and Lc10mentioning

confidence: 99%

Quaternary climatic control of biogenic magnetite production and eolian dust input in cores from the Mediterranean Sea

Dinarès-Turell

Hoogakker

Roberts

et al. 2003

Palaeogeography, Palaeoclimatology, Palaeoecology

View full text Add to dashboard Cite

We report high-resolution magnetic measurements from two Mediterranean piston cores: LC07 (Sicily Strait) and LC10 (Ionian Sea). Magnetostratigraphic results and N 18 O data provide age constraints for core LC07, where we investigate magnetic property variations for two age intervals (0^600 kyr and 660^1020 kyr). For core LC10, rock magnetic parameters appear to be climatically controlled and are used to derive an astronomically tuned age model for the interval between 780 and 1200 kyr. In core LC07, the dominant control on the magnetic properties appears to be glacial^interglacial variations in the concentration of biogenic magnetite. In addition, an increased contribution from high coercivity minerals (e.g. hematite and/or goethite) probably reflects an enhanced eolian input during glacial periods. Climatic control of magnetotactic bacterial populations has been previously suggested in other environments, but this is the first such report from the Mediterranean. In contrast, the rock magnetic response to Quaternary climatic variability in core LC10 seems to be better expressed by variations in the concentration of high coercivity magnetic minerals. The contrast between a dominantly detrital/eolian flux and a dominantly biogenic flux at the same time for the two Mediterranean settings might relate to the presence of an active current regime in the Sicily Strait, which might decrease delivery of an eolian component to the seafloor compared to the deep Ionian Sea. ß

show abstract

Section: The Climatic Rock Magnetic ¢Ngerprint In Cores Lc07 and Lc10mentioning

confidence: 99%

Quaternary climatic control of biogenic magnetite production and eolian dust input in cores from the Mediterranean Sea

Dinarès-Turell

Hoogakker

Roberts

et al. 2003

Palaeogeography, Palaeoclimatology, Palaeoecology

View full text Add to dashboard Cite

show abstract

“…An alternative possibility is that some chlorine was left on or in sanidine crystals or adhered glass after the HCl treatment. During neutron bombardment, small amounts of 36 Ar are generated via L decay from 36 Cl produced by activation of 35 Cl [18]. Elevated 36 Ar in a few subsamples could have an e¡ect similar to that of the hydration-induced fractionation described above.…”

Section: Age Of the Santa Rosa I Domementioning

confidence: 99%

“…For example, sediments from the California margin [35], On-tong-Java Plateau [36], and equatorial Paci¢c [37] all record a pair of prominent lows in relative paleointensity between the Jaramillo normal subchron and the Matuyama-Brunhes reversal (Fig. 7).…”

Section: Implications For the Geomagnetic Reversal Time Scalementioning

confidence: 99%

The Santa Rosa Event: 40Ar/39Ar and paleomagnetic results from the Valles rhyolite near Jaramillo Creek, Jemez Mountains, New Mexico

Singer

Brown

2002

Earth and Planetary Science Letters

View full text Add to dashboard Cite

The Jaramillo Event was originally defined by Doell and Dalrymple in 1966 on the basis of K^Ar ages from sanidine in the normally, transitionally and reversely magnetized rhyolite domes named Cerro del Abrigo, Cerro Santa Rosa I and Cerro Santa Rosa II, respectively, that erupted following collapse of the archetypal Valles Caldera, New Mexico. We have collected new paleomagnetic data from the three domes and new 40 Ar/ 39 Ar laser fusion and furnace incremental heating experiments on sanidine crystals from the Cerro Santa Rosa I rhyolite.Step-wise alternating field and thermal demagnetization techniques applied to 52 samples from seven sites indicate that the original paleomagnetic results of Doell and Dalrymple [Science 152 (1966) 1060^1061] are valid. Cerro del Abrigo is normally magnetized, whereas the Santa Rosa I dome is transitional with an inclination of 363 ‡ toward the east and the Santa Rosa II dome is of reversed polarity. Twenty-five laser fusion experiments on sanidine crystals from the the Cerro Santa Rosa I dome, together with the saddle-shaped spectrum obtained by incrementally heating the sanidine in a furnace reveal that this rhyolite contained a small but significant component of excess argon prior to eruption. Our preferred age of 936 þ 8 ka ( þ 2c) for the Santa Rosa I rhyolite is based on the concordant laser fusion isochron and incremental heating plateau ages. This age is significantly older than was inferred on the basis of earlier laser fusion 40 Ar/ 39 Ar results that suggested a trapped component characterized by a 40 Ar/ 36 Ar ratio lower than the atmospheric value of 295.5. Our new age distinguishes the Santa Rosa I dome by 65 kyr from the termination of the Jaramillo normal subchron 1001 þ 10 ka and by 37 kyr from basaltic lavas at Haleakala and Tahiti, which record the Kamikatsura Event 899 þ 6 ka. Moreover, this determination is a factor of three more precise than the best previous estimate for a proposed geomagnetic event in this time period. The Cerro Santa Rosa I rhyolite dome, once intimately linked with the end of the Jaramillo Event and the acceptance of plate tectonic theory, now defines a highly resolved feature, the Santa Rosa Event, in a terrestrial geomagnetic reversal time scale that is consistent with the global record of magnetic field intensity from marine sediments. ß

show abstract

“…Marine oceanic sediments provide high-resolution records of the relative paleointensity of the geomagnetic field in the past. Specifically, records from OntongeJava Plateau (Kok and Tauxe, 1999), equatorial Pacific (Valet and Meynadier, 1993), and California margin (Guyodo et al, 1999) all record a pair of prominent lows in relative paleointensity between the Jaramillo Subchron and the MB boundary, coinciding with the expected position of Kamikatsura and Santa Rosa short polarity intervals at w0.88 Ma and 0.92 Ma respectively (e.g., Singer et al, 1999).…”

mentioning

confidence: 99%

Reassessing the age of Atapuerca-TD6 (Spain): new paleomagnetic results

Parés¹,

Arnold²,

Duval³

et al. 2013

Journal of Archaeological Science

101

View full text Add to dashboard Cite

Paleointensity record from Pleistocene sediments (1.4–0 Ma) off the California Margin

Cited by 59 publications

References 42 publications

Quaternary climatic control of biogenic magnetite production and eolian dust input in cores from the Mediterranean Sea

Quaternary climatic control of biogenic magnetite production and eolian dust input in cores from the Mediterranean Sea

The Santa Rosa Event: 40Ar/39Ar and paleomagnetic results from the Valles rhyolite near Jaramillo Creek, Jemez Mountains, New Mexico

Reassessing the age of Atapuerca-TD6 (Spain): new paleomagnetic results

Contact Info

Product

Resources

About