M-sequence reversals recorded in DSDP sediment cores from the western Mid-Pacific Mountains and Magellan Rise

Tarduno, J. A.; Sliter, William V.; Bralower, Timothy J.; McWilliams, Michael; Premoli-Silva, Isabella; Ogg, James G.

doi:10.1130/0016-7606(1989)101<1306:msrrid>2.3.co;2

Cited by 53 publications

(45 citation statements)

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“…Latest Barremian polarity Zone Ml is reported to begin in Core 167-69R, Section 2, and the earliest Aptian polarity Zone M0 in Core 67R, Section 1 (Tarduno et al, 1989); implying that this 3 m.y. interval has an average sedimentation rate of approximately 7 m/m.y.…”

Section: Site 167 (Magellan Rise)-late Berriasian Through Barremian Smentioning

confidence: 94%

“…interval has an average sedimentation rate of approximately 7 m/m.y. Alternatively, foraminifer identifications and contorted bedding suggest that Cores 167R-68 through -65 may contain intervals of largescale sliding and associated missing or repeated sections; therefore the sedimentation rate is uncertain (Tarduno et al, 1989;Sliter, 1989). These early Aptian sediments of Core 67R through lower Core 65R contain an abundance of dark greenish-gray, zeolite-and glass-rich, volcanic tuff.…”

Section: Site 167 (Magellan Rise)-late Berriasian Through Barremian Smentioning

confidence: 99%

“…Integration of Site 463 magnetic stratigraphy (Sayre, 1981;Tarduno et al, 1989) and sedimentology (Shipboard Scientific Party, 1981a) allows precise determination of average sedimentation rates. Prior to the influx of volcanic ash above magnetic polarity Zone M0 of the early Aptian (Core 463-72R), approximately 190 m of siliceous limestone and redeposited shallow-water carbonates accumulated during the late Barremian between M3 and M0, implying an average sedimentation rate of approximately 20 to 25 m/m.y.…”

Section: Site 463 (Mid-pacific Mountains)-barremian Siliceous Limestonementioning

confidence: 99%

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Jurassic through Early Cretaceous Sedimentation History of the Central Equatorial Pacific and of Sites 800 and 801

Ogg¹,

Stattegger²,

Behl³

1992

Proceedings of the Ocean Drilling Program

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Sedimentation in the central Pacific during the Jurassic and Early Cretaceous was dominated by abundant biogenic silica. A synthesis of the stratigraphy, lithology, petrology, and geochemistry of the radiolarites in Sites 801 and 800 documents the sedimentation processes and trends in the equatorial central Pacific from the Middle Jurassic through the Early Cretaceous. Paleolatitude and paleodepth reconstructions enable comparisons with previous DSDP sites and identification of the general patterns of sedimentation over a wide region of the Pacific.Clayey radiolarites dominated sedimentation on Pacific oceanic crust within tropical paleolatitudes from at least the latest Bathonian through Tithonian. Radiolarian productivity rose to a peak within 5° of the paleoequator, where accumulation rates of biogenic silica exceeded 1000 g/cm 2 /m.y. Wavy-bedded radiolarian cherts developed in the upper Tithonian at Site 801 coinciding with the proximity of this site to the paleoequator. Ribbon-bedding of some radiolarian cherts exposed on Pacific margins may have formed from silicification of radiolarite deposited near the equatorial high-productivity zone where radiolarian/clay ratios were high. Silicification processes in sediments extensively mixed by bioturbation or enriched in clay or carbonate generally resulted in discontinuous bands or nodules of porcellanite or chert, e.g., a "knobby" radiolarite. Ribbon-bedded cherts require primary alternations of radiolarian-rich and clay-rich layers as an initial structural template, coupled with abundant biogenic silica in both layers. During diagenesis, migration of silica from clay-rich layers leaves radiolarian "ghosts" or voids, and the precipitation in adjacent radiolarite layers results in silicification of the inter-radiolarian matrix and infilling of radiolarian tests. Alternations of claystone and clay-rich radiolarian grainstone were deposited during the Callovian at Site 801 and during the Berriasian-Valanginian at Site 800, but did not silicify to form bedded chert.Carbonate was not preserved on the Pacific oceanic floor or spreading ridges during the Jurassic, perhaps due to an elevated level of dissolved carbon dioxide. During the Berriasian through Hauterivian, the carbonate compensation depth (CCD) descended to approximately 3500 m, permitting the accumulation of siliceous limestones at near-ridge sites. Carbonate accumulation rates exceeded 1500 g/cm 2 /m.y. at sites above the CCD, yet there is no evidence of an equatorial carbonate bulge during the Early Cretaceous. In the Barremian and Aptian, the CCD rose, coincident with the onset of mid-plate volcanic activity.Abundance of Fe and Mn and the associated formation of authigenic Fe-smectite clays was a function of proximity to the spreading ridges, with secondary enrichments occurring during episodes of spreading-center reorganizations. Callovian radiolarite at Site 801 is anomalously depleted in Mn, which resulted either from inhibited precipitation of Mn-oxides by lower pH of interstitial waters in...

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Section: Site 167 (Magellan Rise)-late Berriasian Through Barremian Smentioning

confidence: 94%

Section: Site 167 (Magellan Rise)-late Berriasian Through Barremian Smentioning

confidence: 99%

Section: Site 463 (Mid-pacific Mountains)-barremian Siliceous Limestonementioning

confidence: 99%

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Jurassic through Early Cretaceous Sedimentation History of the Central Equatorial Pacific and of Sites 800 and 801

Ogg¹,

Stattegger²,

Behl³

1992

Proceedings of the Ocean Drilling Program

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“…The third overprint, observed in only a few samples, appears to be a normal field overprint that was acquired while the site was still in the Southern Hemisphere. This last overprint also was observed in paleomagnetic data obtained from pelagic carbonates from nearby DSDP Site 463 (Sayre, 1981;Tarduno et al, 1989), drilled on the apron of Resolution Guyot.…”

Section: Methodsmentioning

confidence: 71%

“…Reversed polarity Chron CMO is thought to lie entirely within the early Aptian (Tarduno et al, 1989), not across the Aptian/Barremian boundary, as depicted in some time scales (Harland et al, 1990). The lower boundary of CMO, however, falls close to the Aptian/Barremian boundary.…”

Section: Tentative Polarity Interpretationmentioning

confidence: 99%

Early Cretaceous Magnetostratigraphy and Paleolatitudes from the Mid-Pacific Mountains: Preliminary Results Bearing on Guyot Formation and Pacific Plate Translation

Tarduno¹,

Sager²,

Nogi³

1995

Proceedings of the Ocean Drilling Program, 143 Scientific Results

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Detailed thermal demagnetization experiments applied to some weakly magnetized shallow-water carbonates recovered at Site 866 (991-1622 mbsf) yield a characteristic remanent magnetization having maximum unblocking temperatures of 500° to 580°C, after the removal of one or more overprints. Alternating field (AF) demagnetization yields a similar characteristic component. This magnetization shows both polarities, which form 10 polarity zones that we correlate to the upper Mesozoic "M-sequence" of the marine magnetic anomaly record. Using tie points derived from paleontologic and isotopic studies, we tentatively assign the polarity zones to CM1 through CM7. Such an assignment requires that basement at Site 866 be of M7 age (or older), broadly consistent with radiometric age data that suggest an age of 128 Ma. Using this interpretation, at least one major hiatus and several substantial changes in sedimentation rate are required in the carbonate sequence.Paleolatitude data from the Site 866 carbonates (14.6°S) are within error of an early Aptian data set from nearby Site 463 (13°S), suggesting little (or no) latitudinal transport during the later part of the Early Cretaceous. Comparisons with younger data sets also suggest that total latitudinal translation from the time of edifice formation to the mid-Cretaceous was minor (±5°). These data do not support drift toward extreme southerly latitudes as a cause of platform drowning. This near-stationary behavior of the Pacific Plate over an area of vigorous mantle convection may account for some patterns of subsidence that are implied by the magnetostratigraphic data.

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More stable yet bimodal geodynamo during the Cretaceous superchron?

Lhuillier

Gilder

Wack

et al. 2016

Geophysical Research Letters

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We report palaeomagnetic and 40Ar/39Ar dating results from two sequences of basaltic lava flows deposited at the same locality in western China, yet separated in time by ~50 Myr: one set lies within the Cretaceous normal superchron at 112–115 Ma and a second at 59–70 Ma spanning the Cretaceous‐Palaeogene boundary. We find that magnetic field directions during the superchron exhibit bimodal populations: one with inclinations representative of a dipolar field and another with shallow inclinations that could reflect a more complex, multipolar field. However, the time‐dependent variability in field directions was 50% lower during the superchron than after, which implies greater field stability during the superchron. Our results suggest that episodes of less dipolar field behavior occurred within the Cretaceous superchron and raise the question whether a second, more multipolar, field state is more persistent than previously thought.

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M-sequence reversals recorded in DSDP sediment cores from the western Mid-Pacific Mountains and Magellan Rise

Cited by 53 publications

References 0 publications

Jurassic through Early Cretaceous Sedimentation History of the Central Equatorial Pacific and of Sites 800 and 801

Jurassic through Early Cretaceous Sedimentation History of the Central Equatorial Pacific and of Sites 800 and 801

Early Cretaceous Magnetostratigraphy and Paleolatitudes from the Mid-Pacific Mountains: Preliminary Results Bearing on Guyot Formation and Pacific Plate Translation

More stable yet bimodal geodynamo during the Cretaceous superchron?

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