Magnetic inclination shallowing problem and the issue of Eurasia's rigidity: insights following a palaeomagnetic study of upper Cretaceous basalts and redbeds from SE China

Li, Yongxiang; Shu, Liangshu; Wen, Bin; Yang, Zhenyu; Ali, Jason R.

doi:10.1093/gji/ggt181

Cited by 17 publications

(16 citation statements)

References 70 publications

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“…VGP positions of A1 and A3 fell squarely well on the paleopoles of China in Cretaceous age (Gilder and Courtillot 1997;Huang et al 2007). In particular, the paleopole of A3 is statistically identical to a recently refined late Cretaceous reference pole for the stable South China (Li et al 2013). On the other hand, the paleopole of A4 is statistically indistinguishable to the paleopoles of China in early Tertiary (Zhao et al 1994), Paleogene to Neogene (Gilder and Courtillot 1997), and/or late Tertiary (Huang et al 2004).…”

Section: Discussionsupporting

confidence: 61%

“…To estimate vertical rotation for individual study, three commonly used reference poles from China were assigned for Neogene (Zhao et al 1994), Paleogene to Cretaceous (Huang et al 2007), and Jurassic (Gilder et al 1997). We limited vertical rotation analysis extending only up to Jurassic because the collision (Zhao et al 1994); solid blue squares for Paleogene, South China (Gilder and Courtillot 1997); solid green squares for Neogene, North China (Gilder and Courtillot 1997); solid blue circles for Cretaceous, China (Gilder and Courtillot 1997); solid green circles for Cretaceous, China (Gilder and Courtillot 1997); open inverted black triangle for late Tertiary, China (Huang et al 2004); open black circle for Cretaceous, China (Huang et al 2007); open brown circles for late Cretaceous, South China (Li et al 2013).…”

Section: Discussionmentioning

confidence: 99%

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Paleomagnetism and U-Pb geochronology of the late Cretaceous Chisulryoung Volcanic Formation, Korea: tectonic evolution of the Korean Peninsula

Jeong

Doh

et al. 2015

Earth Planet Sp

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Late Cretaceous Chisulryoung Volcanic Formation (CVF) in southeastern Korea contains four ash-flow ignimbrite units (A1, A2, A3, and A4) and three intervening volcano-sedimentary layers (S1, S2, and S3). Reliable U-Pb ages obtained for zircons from the base and top of the CVF were 72.8 ± 1.7 Ma and 67.7 ± 2.1 Ma, respectively. Paleomagnetic analysis on pyroclastic units yielded mean magnetic directions and virtual geomagnetic poles (VGPs) Our best estimates of the paleopoles for A1, A3, and A4 are in remarkable agreement with the reference apparent polar wander path of China in late Cretaceous to early Paleogene, confirming that Korea has been rigidly attached to China (by implication to Eurasia) at least since the Cretaceous. The compiled paleomagnetic data of the Korean Peninsula suggest that the mode of clockwise rotations weakened since the mid-Jurassic. Such interesting variation of vertical rotations in the Korean Peninsula might result from the strike-slip motions of major faults developed in East Asia (the Tancheng-Lujiang fault to the northwest and the Korea-Taiwan strait fault to the southeast), near-field tectonic forcing of the subducting Pacific Plate beneath the Eurasian Plate, and far-field expressions of the India-Asia collision.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Paleomagnetism and U-Pb geochronology of the late Cretaceous Chisulryoung Volcanic Formation, Korea: tectonic evolution of the Korean Peninsula

Jeong

Doh

et al. 2015

Earth Planet Sp

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“…However, considering that compaction-induced inclination shallowing is still a critical and unresolved problem for the validity of paleomagnetic data from redbeds (e.g., Sun et al, 2006;Tan et al, 2010;Li et al, 2013;Huang et al, 2013;Lippert et al, 2014;Yang et al, 2014;Ding et al, 2015), in this study we only consider reliable volcanic paleomagnetic data sets. Four available Early Cretaceous poles have been obtained from volcanic rocks (Table 1).…”

Section: Early Cretaceous Latitude Of the Lhasa Terranementioning

confidence: 99%

Paleomagnetic results from the Early Cretaceous Lakang Formation lavas: Constraints on the paleolatitude of the Tethyan Himalaya and the India–Asia collision

Yang

Bian

et al. 2015

Earth and Planetary Science Letters

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“…To detect inclination shallowing in sedimentary rocks, one straightforward approach is to compare paleomagnetic data from sedimentary rocks with those from coeval igneous rocks, provided that the contemporaneous age of both types of rocks can be assured and a sufficient number of igneous cooling units are sampled to adequately average secular variation. These requirements can be satisfied in some sections where multiple basalt layers are sandwiched between sedimentary layers (Gilder et al, 2003;Li et al, 2013). However, in reality, such conditions are rare and are not commonly present in a sedimentary section of interest.…”

Section: Introductionmentioning

confidence: 99%

Detecting and Correcting for Paleomagnetic Inclination Shallowing of Sedimentary Rocks: A Review

Kodama

2016

Front. Earth Sci.

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Magnetic anisotropy and the elongation/inclination (E-I) approaches have been increasingly employed as two important means for detecting and correcting the paleomagnetic inclination shallowing in sedimentary rocks that was first recognized 60 years ago. Both approaches are based on certain assumptions, and thus have advantages and intrinsic limitations in investigating shallow inclinations in sedimentary rocks. The E-I approach is relatively easy to use, but it needs a large dataset to adequately sample paleomagnetic directions due to paleosecular variation (PSV) of the geomagnetic field. Also, slow sediment accumulation rates (SARs) and local tectonics could lead to under-or over-corrections using the E-I approach. For the magnetic anisotropy technique, labor-intensive, sophisticated laboratory rock magnetic experiments are required in order to accurately determine both bulk magnetic anisotropy of remanence-carrying grains and magnetic anisotropy of an individual particle, i.e., "a" factor, of samples. Our review shows that, despite the intensive laboratory work necessary for applying anisotropy-based inclination corrections, it is worth investing the effort. In addition, the joint use of magnetic susceptibility and remanence anisotropy measurements as well as detailed rock magnetic measurements for determining the particle anisotropy "a" factor have the advantage of retrieving direct evidence of inclination shallowing and correcting for it with high confidence. We caution against use of either of the two approaches without full appreciation of the underlying assumptions and intrinsic limitations of each technique. The use and comparison of both techniques could provide the most robust inclination shallowing correction for sedimentary rocks.

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Magnetic inclination shallowing problem and the issue of Eurasia's rigidity: insights following a palaeomagnetic study of upper Cretaceous basalts and redbeds from SE China

Cited by 17 publications

References 70 publications

Paleomagnetism and U-Pb geochronology of the late Cretaceous Chisulryoung Volcanic Formation, Korea: tectonic evolution of the Korean Peninsula

Paleomagnetism and U-Pb geochronology of the late Cretaceous Chisulryoung Volcanic Formation, Korea: tectonic evolution of the Korean Peninsula

Paleomagnetic results from the Early Cretaceous Lakang Formation lavas: Constraints on the paleolatitude of the Tethyan Himalaya and the India–Asia collision

Detecting and Correcting for Paleomagnetic Inclination Shallowing of Sedimentary Rocks: A Review

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