Paleomagnetic results of Paleozoic and Mesozoic rocks from Xingshan-Zigui section in Hubei Province, South China

Wu, Hanning; Zhu, Rixiang; Courtillot, Vincent; Bai, Lei; Xing, Jianxiao; Zhao, Yongxin; Yang, Gelian

doi:10.1007/bf02878517

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…In addition, Wu et al . [] also published an Early‐Middle Ordovician paleomagnetic result from the Xingshan‐Zigui section in Hubei Province. One Middle Ordovician site with 13 samples, and three Early Ordovician sites with 13 samples, yielded a site‐mean direction of D / I = 146.2°/17.6° ( α 95 = 13.7°) after tilt correction.…”

Section: Discussionmentioning

confidence: 99%

“…The main reason for the uncertain paleoposition of South China in the Gondwanan frame is the lack of a high‐quality paleomagnetic data set for the early Paleozoic. Apart from widespread late Mesozoic remagnetization related to the intense tectonic magmatism in the Yangtze Block [ Kent et al ., ; Wang and Van der Voo , ; Bai et al ., ], Ordovician paleomagnetic data were reported [ Fang et al ., ; Wu et al ., ] in which the reliability quality index Q [ Van der Voo , ] is generally lower than 5. These results are controversial.…”

Section: Introductionmentioning

confidence: 99%

“…[] obtained a high paleolatitude of 48°S in the Early Ordovician for the Yangtze Block, while Wu et al . [] argued that the paleolatitude was 9.5°S in Early and Middle Ordovician time. Although high‐quality paleomagnetic results were obtained for the Middle Cambrian [ Bai et al ., ; Yang et al ., ] and Silurian [ Opdyke et al ., ; Huang et al ., ], the lack of reliable Ordovician paleomagnetic data results in a large gap of about 80 Ma from the Middle Cambrian to the Silurian, which hampers the establishment of an integrated apparent polar wander path (APWP) for the Yangtze Block in the early Paleozoic.…”

Section: Introductionmentioning

confidence: 99%

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New paleomagnetic results from Late Ordovician rocks of the Yangtze Block, South China, and their paleogeographic implications

et al. 2015

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The paleogeographic relationship between South China and Australia during the Ordovician is important for understanding the configuration of South China in Gondwana. However, high‐quality Ordovician paleomagnetic results for the Yangtze Block are scarce. Here we report the results of a new paleomagnetic study of the Late Ordovician limestones of Wangcang County in the northern Yangtze Block, performed in order to constrain the paleoposition of South China. Two magnetic components were isolated by detailed stepwise thermal demagnetization. The low‐temperature component falls close to the local current Earth's field direction. The site‐mean direction obtained from the high‐temperature component (HTC) carried by magnetite is D/I = 132.6°/−35.2° (α95 = 3.6°) after bedding correction, yielding a paleomagnetic pole at 45.8°S, 191.3°E (dp = 2.4°, dm = 4.2°). The HTC direction passed reversal and fold tests, and its corresponding pole differs from the available paleomagnetic poles since the Silurian of the South China Block. These results suggest that the remanent magnetization was probably acquired during the earliest stage of sedimentation. The high‐temperature component yields a paleolatitude of 19.5°S, implying that the Yangtze Block was at tropic latitudes during the Late Ordovician. These new and reliable paleomagnetic results bridge the Ordovician data gap and favor the proximity between South China and Australia during the Late Ordovician.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New paleomagnetic results from Late Ordovician rocks of the Yangtze Block, South China, and their paleogeographic implications

et al. 2015

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“…In recent years, palaeomagnetic studies on the geologic terranes of China have seen great advances with increasing accuracy and reliability (e.g. Zhao and Coe, 1987; Wu et al. , 1990, 1999; Enkin et al.…”

Section: Spatial‐temporal Constraints On the Early Mesozoic Collisionmentioning

confidence: 99%

“…The Zigui and northwest Sichuan basins are located in the foreland of the east Qinling, west of the Dabie Shan. These basins have evidence of terrestrial deposition of varicoloured sandstone with some intercalated coal seams that occur later in the middle Norian of the Late Triassic (Wu et al. , 1999; Liu et al.…”

Section: Spatial‐temporal Constraints On the Early Mesozoic Collisionmentioning

confidence: 99%

Collision and rotation of the South China block and their role in the formation and exhumation of ultrahigh pressure rocks in the Dabie Shan orogen

Guo

Encarnación

et al. 2012

Terra Nova

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Studies of regional plate-scale processes that may influence the exhumation of ultra-high pressure (UHP) metamorphic rocks are few despite their potential importance. Here, we review and summarize available age constraints along with the Qinling-Dabie Shan orogen, which separates the North China Block (NCB) from the South China Block (SCB). We find that collision-related events in the west and extension-related events in the east, where the large Dabie Shan UHP terrane is located, were contemporaneous. Available palaeomagnetic data indicate clockwise rotation of the SCB relative to the NCB during this time. Previous work indicated that the collision propagated from east to west where indentation of the SCB into the Qinling-Dabie Shan orogen was active in the Hannan Dome area at 165 ± 3 Ma as constrained by new 40 Ar ⁄ 39 Ar dates on synkinematic sericite in an indentation-related mylonitic shear zone. While this contraction was occurring in the west, exhumation of the UHP terrane was occurring in the Dabie Shan in the east. We propose that the collision of the SCB with the NCB occurred not only in a scissor-like fashion, as previously suggested, but also involved a later rotation about a pole west of the Dabie Shan during the closure of the Mianlue Ocean. As a consequence of this rotation, extension occurred between the South China Block and North China Block east of the pole of rotation leading to extensional exhumation of the Dabie Shan orogen. This microcontinent-scale rotation of the SCB may have provided an important component in the exhumation of the largest UHP terrane in the world.

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The Early Paleozoic paleogeography of the North China block and the other major blocks of China

et al. 2000

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Paleomagnetic results of Paleozoic and Mesozoic rocks from Xingshan-Zigui section in Hubei Province, South China

Cited by 8 publications

References 10 publications

New paleomagnetic results from Late Ordovician rocks of the Yangtze Block, South China, and their paleogeographic implications

New paleomagnetic results from Late Ordovician rocks of the Yangtze Block, South China, and their paleogeographic implications

Collision and rotation of the South China block and their role in the formation and exhumation of ultrahigh pressure rocks in the Dabie Shan orogen

The Early Paleozoic paleogeography of the North China block and the other major blocks of China

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