New Early Triassic paleomagnetic data from Huangben section, Guangdong and its tectonic implications

Shen, Zhongyan; Ding, Jinghai; Changhe, YE; Wen, Jiaming; Wang, Zhaoliang; Chen, Zhifei

doi:10.1007/s11434-006-2033-0

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…(b–e) Distribution of Mesozoic remagnetization events, granitoids and major ore deposits in the SCB (granitoids are from Hong et al, ; ore deposits are from Hu & Zhou, ; Long & Liu, ; Mao et al, ; Wang et al, , ; Wu, ; Yang & Li, ; Yang, Mao, et al, ; Zhang et al, ). Xialei: this study; Nanjing: Kent et al (); Yichang: Kent et al (), Jing et al (); Changshou: Enkin et al (); Chuanshan and Huanglong: Dobson and Heller (); Badong: Huang and Opdyke (); Dushan: Zhang et al (); Xuyong: Yang and Besse (); Huangben: Shen et al (); Wanzhou: Han et al (); Yibin: Zhang et al (); Jiangshan: Jiao et al (); Taoyuan: Jiao et al ().…”

Section: Discussionmentioning

confidence: 91%

Magmatic‐Hydrothermal Alteration Mechanism for Late Mesozoic Remagnetization in the South China Block

et al. 2019

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Although the late Mesozoic remagnetization of the South China Block (SCB) is well recognized, the mechanism is unclear due to poor constraints on the genesis of secondary magnetic minerals. This issue is addressed via the study of the world's largest Paleozoic Mn deposit, in which both early Paleozoic sedimentation of manganese carbonate minerals and undated hydrothermal overprinting manifested by the presence of Mn silicate minerals with associated magnetite. Laser ablation-inductively coupled plasma-mass spectrometry in situ element analyses and paleomagnetic studies are applied to determine the age of hydrothermal alteration, and the results shed new light on the remagnetization mechanism of the SCB. Laser ablation-inductively coupled plasma-mass spectrometry in situ analyses show that the secondary magnetites have high values of (Ca + Al + Mn) and low values of (Ti + V) and (Ni/Cr)/Ti. This, together with coexisting skarn formation, supports a hydrothermal origin. The postfolding remagnetization is characterized by a stable component and a systematic normal polarity, carried by magnetite. The mean direction has a declination of 22.9°and an inclination of 56.1°, with a statistical parameter α 95 of 4.1°. Comparison with previously reported paleopoles indicates that the remagnetization was mostly acquired during the Late Cretaceous. Therefore, our results confirm that the hydrothermal magnetite carries a chemical remanent magnetization as a result of Late Cretaceous skarn formation. From a regional perspective, hydrothermal alteration from the Middle Jurassic to the Late Cretaceous, covering most parts of SCB, is proposed to be one of the important mechanisms for the ubiquitous late Mesozoic remagnetization.

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Section: Discussionmentioning

confidence: 91%

Magmatic‐Hydrothermal Alteration Mechanism for Late Mesozoic Remagnetization in the South China Block

et al. 2019

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“…; Shen et al . ). From the Late Proterozoic to the end of the Middle Triassic, the Yangtze Craton of South China was a stable continent characterised by shallow‐water carbonate deposition (Liu and Xu ; Ma et al .…”

Section: Geological Settingmentioning

confidence: 97%

The first specimen of the Middle Triassic Phalarodon atavus (Ichthyosauria: Mixosauridae) from South China, showing postcranial anatomy and peri‐Tethyan distribution

et al. 2013

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Phalarodon atavus from the Germanic Muschelkalk Basin was previously represented only by cranial elements. Here we report a nearly complete and articulated specimen of P. atavus from the Middle Triassic Luoping Biota, Yunnan, South China. This is the first specimen of P. atavus from outside the Germanic Basin. This discovery demonstrates a peri-Tethyan distribution of P. atavus. The new specimen is also the first one preserving the postcranial anatomy of this species, providing the opportunity to evaluate its sustained swimming ability. Inferences made on its functional morphology suggest that this species was probably adapted for active foraging. Tooth crown morphology suggests that P. atavus may have preferred externally soft prey.

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“…The South China Block is composed of the Yangtze Craton and the South China Fold Belt that together formed a stable continent from the late Proterozoic or early Paleozoic ( Shen et al, 2006 ) into the early Mesozoic. During this time deposition was characterized by shallow-water carbonates.…”

Section: Geological Settingmentioning

confidence: 99%

The oldest record of Saurosphargiformes (Diapsida) from South China could fill an ecological gap in the Early Triassic biotic recovery

Cheng

Moon

Yan

et al. 2022

PeerJ

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Diversification following the end-Permian mass extinction marks the initiation of Mesozoic reptile dominance and of modern marine ecosystems, yet major clades are best known from the Middle Triassic suggesting delayed recovery, while Early Triassic localities produce poorly preserved specimens or have restricted diversity. Here we describe Pomolispondylus biani gen. et sp. nov. from the Early Triassic Nanzhang-Yuan’an Fauna of China assigned to Saurosphargiformes tax. nov., a clade known only from the Middle Triassic or later, which includes Saurosphargidae, and likely is the sister taxon to Sauropterygia. Pomolispondylus biani is allied to Saurosphargidae by the extended transverse processes of dorsal vertebrae and a low, table-like dorsal surface on the neural spine; however, it does not have the typical extensive osteoderms. Rather an unusual tuberous texture on the dorsal neural spine and rudimentary ossifications lateral to the gastralia are observed. Discovery of Pomolispondylus biani extends the known range of Saurosphargiformes and increases the taxic and ecological diversity of the Nanzhang-Yuan’an Fauna. Its small size fills a different ecological niche with respect to previously found species, but the overall food web remains notably different in structure to Middle Triassic and later ecosystems, suggesting this fauna represents a transitional stage during recovery rather than its endpoint.

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New Early Triassic paleomagnetic data from Huangben section, Guangdong and its tectonic implications

Cited by 8 publications

References 28 publications

Magmatic‐Hydrothermal Alteration Mechanism for Late Mesozoic Remagnetization in the South China Block

Magmatic‐Hydrothermal Alteration Mechanism for Late Mesozoic Remagnetization in the South China Block

The first specimen of the Middle Triassic Phalarodon atavus (Ichthyosauria: Mixosauridae) from South China, showing postcranial anatomy and peri‐Tethyan distribution

The oldest record of Saurosphargiformes (Diapsida) from South China could fill an ecological gap in the Early Triassic biotic recovery

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