Paleomagnetism of a well-dated marine succession in South China: A possible Late Cambrian true polar wander (TPW)

Jiao, Wenjie; Li, Yong-Xiang; Yang, Zhenyu

doi:10.1016/j.pepi.2018.01.009

Cited by 10 publications

(16 citation statements)

References 75 publications

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“…(a) The map showing the temporal‐spatial variation of the Triassic remagnetization in South China. The dark green, red, and light green pentagram denotes the location where Early‐Middle Triassic (T 1‐2 , Jiao et al, ), Middle Triassic (T 2 , this study), and Late Triassic (T 3 ; Zhang et al, ) remagnetization was observed, respectively. The curved arrow shows the regional younging trend of the Triassic remagnetization in South China.…”

Section: Discussionmentioning

confidence: 73%

“…Unlike the widely recorded Late Mesozoic remagnetization in South China (e.g., Dobson & Heller, ; Evans et al, ; Gao et al, ; Huang et al, ; Huang & Opdyke, ; Jing et al, ; Jing et al, ; Kent et al, ; Zhang et al, ), a Triassic overprint was previously reported by only a few studies (Jiao et al, ; Zhang et al, ). Zhang et al () reported a Late Triassic (T 3 ) remagnetization from Sichuan, western South China, and Jiao et al () recently reported an Early‐Middle Triassic (T 1–2 ) remagnetization component from Zhejiang, eastern South China. These records, together with the Middle Triassic (T 2 ) remagnetization recognized in middle South China (this study), present a temporal‐spatial pattern of the Triassic remagnetization that appears to exhibit a younging trend of remagnetization from the east to the west of South China (Figure ).…”

Section: Discussionmentioning

confidence: 78%

“…This age constraint on the timing of folding, however, is too crude to definitively conclude that the positive fold tests of the HTC indicate a primary remanence. Indeed, pre‐Jurassic remagnetization has been increasingly recognized in South China recently (e.g., Jiao et al, ; Jing et al, ; S. Zhang et al, ; Y. Zhang et al, ; Y. Zhang et al, ). As such, we compare the paleomagnetic pole of the HTC with the apparent polar wander path of South China.…”

Section: Discussionmentioning

confidence: 99%

“…(b) The Triassic apparent polar wander path (APWP) of South China (dark gray) and the positions of the Triassic remagnetized paleopoles. The position of the dark green paleopole is not unique and can be anywhere within the green shaded area (see Jiao et al, for details), thus intersecting with both T1 and T2 paleopoles of the APWP of South China. Such an intersection yields an estimate of the T1–2 remagnetization for the dark green paleopole.…”

Section: Discussionmentioning

confidence: 99%

“…From the temporal perspective, Mitchell et al () presented paleomagnetic data from a single stratigraphic succession in the Amadeus Basin, center of Australia, as evidence supporting the Early Cambrian TPW hypothesis. Recently, Jiao et al () conducted a detailed paleomagnetic study of a well‐dated continuous Cambrian succession from the Jiangshanian global standard stratotype‐section and point (GSSP) section in Jiangshan, South China, and the primary remanence was successfully resolved that indicates a possible Late Cambrian TPW. As a TPW should be global, the discovery intrigued us to test the Late Cambrian TPW hypothesis in other continuous Cambrian successions that are also chronologically well constrained.…”

Section: Introductionmentioning

confidence: 99%

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A Widespread Early Mesozoic Remagnetization in South China

Jiao

Yang

et al. 2019

JGR Solid Earth

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The recent discovery of a possible Late Cambrian true polar wander (TPW) from the Jiangshan section in eastern South China has intrigued us to test this TPW in other continuous, well-dated Upper Cambrian successions. We have conducted a detailed paleomagnetic study of a continuous Upper Cambrian succession in Wa'ergang, Hunan Province, middle South China, that contains well-defined trilobite zones correlative with those of the Jiangshan section. Three remanence components were isolated from the Upper Cambrian limestone. The low-and intermediate-temperature components represent a recent viscous magnetization and a Cretaceous remagnetization, respectively. The high-temperature component passes fold tests, but its pole lies close to the Middle Triassic pole of South China, indicating a Middle Triassic remagnetization.Rock magnetic analyses and petrographic observations indicate that the high-temperature component resides in small framboidal magnetite aggregates that were formed via alteration and replacement of pyrite and represents a chemical remagnetization. This Middle Triassic remagnetization and previously recognized Triassic remagnetization exhibit a younging trend from the east to the west of South China. The widespread Triassic remagnetization was likely associated with the Indosinian orogeny during which the scissor-like suturing processes between the South and North China Blocks and the accompanying so-called squeegeed orogenic fluids led to progressively westward younging remagnetization in South China. Although the new paleomagnetic results do not allow us to effectively test the Late Cambrian TPW due to the thorough remagnetization, these data provide important insights into understanding the Early Mesozoic remagnetization and associated geological processes.

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Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Widespread Early Mesozoic Remagnetization in South China

Jiao

Yang

et al. 2019

JGR Solid Earth

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True polar wander in the Earth system

Wang

Mitchell

2023

Sci. China Earth Sci.

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True polar wander (TPW), or planetary reorientation, is the rotation of solid Earth (crust and mantle) about the liquid outer core in order to stabilize Earth’s rotation due to mass redistribution. Although TPW is well-documented on Earth presently with satellites and for multiple planets and moons in the Solar System, the prevalence of TPW in Earth history remains contentious. Despite a history of controversy, both the physical plausibility of TPW on Earth and an empirical basis for it are now undisputed. Lingering resistance to the old idea likely stems from the fact that, like plate tectonics, TPW may influence much of the Earth system, thus acknowledging its existence requires rethinking how many different datasets are interpreted. This review summarizes the development of TPW as a concept and provides a framework for future research that no longer regards TPW like a ghost process that may or may not exist, but as an integral part of the Earth system that can relate shallow and deep processes that are otherwise only mysteriously linked. Specifically, we focus on the temporal regularity of large TPW, and discuss its relationship with the supercontinent–megacontinent cycle based on previous studies. We suggest the assembly of mega-continents has a close linkage to large TPW. Meanwhile, supercontinent tenure and breakup have a close linkage to fast TPW. The effects of TPW on sea level changes, paleoclimate, biological diversity, and other facets of the Earth system are presented and require interdisciplinary tests in the future.

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