Geomagnetic secular variation recorded by sediments deposited during the Cretaceous normal superchron at low latitude

Linder, Julia; Gilder, Stuart

doi:10.1016/j.pepi.2011.05.010

Cited by 12 publications

(10 citation statements)

References 75 publications

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“…To obtain accurate paleolatitudes, we have to not only make exact structural corrections but also average out paleosecular variation. Noticeably, although it is controversial whether the VGP scatter ( S value) is a suitable parameter for quantifying paleosecular variation [ Linder and Gilder , , ], a widely accepted approach is to compare the VGP scatter with those expected by McFadden et al []. Considering that more than 99% of specimens yield normal polarities and their U‐Pb zircon ages range from 132.0 ± 2.0 Ma to 120.0 ± 1.0 Ma, we compared the VGP scatter of the Early Cretaceous Qushenla Fm volcanic rocks with the expected value of the CNPS.…”

Section: Averaging Out Paleosecular Variationmentioning

confidence: 99%

Paleomagnetism and U‐Pb zircon geochronology of Lower Cretaceous lava flows from the western Lhasa terrane: New constraints on the India‐Asia collision process and intracontinental deformation within Asia

Yang

et al. 2014

JGR Solid Earth

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To better understand the India-Asia collisional process and intracontinental deformation within Asia, a paleomagnetic study has been conducted on the Qushenla Formation lava flows dated at~132-120 Ma from the Yanhu area in the western Lhasa terrane. Stepwise thermal demagnetization isolates stable characteristic remanent magnetizations, which include dual polarity and pass fold tests at a 99% confidence level, indicating primary magnetizations. The tilt-corrected site-mean direction for 51 sites is D = 28.2°, I = 34.5°, and k = 74.3°w ith α 95 = 2.3°, corresponding to a paleopole at 61. 4°N, 192.9°E (A 95 = 2.1°). Our new paleomagnetic data, combined with previous Cretaceous volcanic paleomagnetic data from the Lhasa terrane, show that the precollisional southern margin of Asia was at~16.8°N with a relatively E-W alignment and that the Lhasa terrane did not experience significantly discrepant north-south movement although local vertical axis rotations did take place after the Cretaceous. Comparison with the apparent polar wander paths (APWPs) of India and the Cretaceous-Paleocene paleopoles of the Tethyan Himalaya shows that the India-Asia collision was at~54.3 Ma and the Greater India during the Paleocene had a large northern extent of~2000 km (~18.1°) beyond its present northern margin. Comparison with the Cretaceous Eurasian APWP indicates that a latitudinal convergence of~1000 km has taken place between the Lhasa terrane and Eurasia since the India-Asia collision. The amount of north-south shortening deduced from Cretaceous paleomagnetic data is consistent with that accommodated by the Cenozoic fold and thrust belts between the Lhasa terrane and the Hexi corridor.

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Section: Averaging Out Paleosecular Variationmentioning

confidence: 99%

Paleomagnetism and U‐Pb zircon geochronology of Lower Cretaceous lava flows from the western Lhasa terrane: New constraints on the India‐Asia collision process and intracontinental deformation within Asia

Yang

et al. 2014

JGR Solid Earth

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“…Another way to quantify geomagnetic secular variation is through the dispersion in palaeomagnetic directions or poles. Some results suggest relatively low field variability during the CNS than before or after it [ McFadden et al , ], although the interpretation is sometimes equivocal due to the latitudinal dependency of the angular dispersion and problems with how variability is defined [ Biggin et al , ; Linder and Gilder , ].…”

Section: Introductionmentioning

confidence: 99%

“…• Table S1 • Table S2 • Table S3 • is sometimes equivocal due to the latitudinal dependency of the angular dispersion and problems with how variability is defined [Biggin et al, 2008;Linder and Gilder, 2011].…”

Section: Introductionmentioning

confidence: 99%

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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“…In addition, important perturbations in the global carbon cycle, the development of large igneous provinces (LIPs) such as the Kerguelen Plateau and Rajmahal Traps, and an increase of the global sea level have also been recognized (e.g., Leckie et al, 2002;Courtillot and Renne, 2003;Haq, 2014). These changes affected the distribution and evolution of marine ecosystems on a worldwide scale (e.g., Dias-Brito, 1987;Riccardi, 1991;Leckie et al, 2002;Browning and Watkins, 2008;Huber and Leckie, 2011;McAnena et al, 2013;Coccioni et al, 2014;Dummann et al, 2020). This interval contains multiple black shale horizons associated with oceanic anoxic events (OAEs) such as the Selli, 113/Jacob, Kilian, Urbino/Paquier, and Leenhardt events (e.g., Erbacher et al, 1999;Leckie et al, 2002;Browning and Watkins, 2008;Jenkyns, 2010;Coccioni et al, 2014;Sabatino et al, 2015Sabatino et al, , 2018Bottini and Erba, 2018).…”

Section: Introductionmentioning

confidence: 99%

Drilling the Aptian–Albian of the Sergipe–Alagoas Basin, Brazil: paleobiogeographic and paleoceanographic studies in the South Atlantic

Fauth¹,

Bruno²,

Villegas‐Martín³

et al. 2021

Sci. Dril.

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Abstract. The Aptian–Albian interval is characterized by significant paleoclimatic, paleoceanographic, and paleogeographic changes, which in turn affected the distribution and evolution of marine ecosystems. Despite the importance of such studies, there have been few correlations between Aptian–Albian sections of the Tethys Sea and those of the South Atlantic Ocean. This interval, including the Aptian–Albian transition, is preserved in the deposits of the Riachuelo Formation (Sergipe–Alagoas Basin, Brazil) located in the South Atlantic Ocean; therefore, this location was chosen for drilling four new cores. The goals of this paper are as follows: (1) to explain the drilling operation carried out in the deposits of the Riachuelo Formation and the methods used; (2) to present a brief lithostratigraphic characterization of the holes and the paleomagnetic data of core SER-03; and (3) to describe the high potential of the cores recovered for additional investigation in the future. The lithostratigraphic units of the SER-01 core consist mainly of coarse- to fine-grained sandstone, shales, marls, and mudstones; the SER-02 core was excluded due to low recovery; the SER-03 core is mainly composed of fine-grained sediments (shale, marls, and packstone) and bears some ammonite shells; the lithology of core SER-04 is mainly sandstones. Magnetic susceptibility values (χlf and χhf) and frequency-dependent susceptibility (χfd) data suggest that the section is located within the Cretaceous Normal Superchron. Future studies on these cores integrating micropaleontological, paleoichnological, geochemical, stratigraphic, and paleomagnetic (e.g., relative intensity) data will allow for a better understanding of paleoceanographic and paleogeographic events related to the early evolution of the South Atlantic Ocean and how these events correlate to similar events in Tethyan sections.

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Geomagnetic secular variation recorded by sediments deposited during the Cretaceous normal superchron at low latitude

Cited by 12 publications

References 75 publications

Paleomagnetism and U‐Pb zircon geochronology of Lower Cretaceous lava flows from the western Lhasa terrane: New constraints on the India‐Asia collision process and intracontinental deformation within Asia

Paleomagnetism and U‐Pb zircon geochronology of Lower Cretaceous lava flows from the western Lhasa terrane: New constraints on the India‐Asia collision process and intracontinental deformation within Asia

More stable yet bimodal geodynamo during the Cretaceous superchron?

Drilling the Aptian–Albian of the Sergipe–Alagoas Basin, Brazil: paleobiogeographic and paleoceanographic studies in the South Atlantic

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