Landscape configuration of eastern South China during the late Neoproterozoic: New constraints from sedimentary indices and zircon U-Pb-Hf isotopes of the southeastern margin of the Yangtze Block

Huang, Renbo; Liu, Jiarun; Yang, Zhenyu; Li, Yongxiang; Yang, Anshu; Jiao, Wenjie

doi:10.1016/j.precamres.2020.105839

Cited by 3 publications

(3 citation statements)

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“…For tilted structures, tilt or dip corrections were performed using the Stereonet software (version 8.0) [79,80]. In this regard, the original transport directions are determined by the corrected dip directions of foreset laminae in (unidirectional) cross-bedding features [45,81,82]. The slump direction of the sediments can generally be reconstructed by the opposite of the corrected dip direction of the axial plane in a syndepositional fold [83,84].…”

Section: Sampling and Sedimentary Structure Analysismentioning

confidence: 99%

“…The slump direction of the sediments can generally be reconstructed by the opposite of the corrected dip direction of the axial plane in a syndepositional fold [83,84]. In some cases, the lateral boundary of differential lithofacies is approximately perpendicular to the direction of facies changes [45,46]. In order to present a more concise dataset, the measured directional structures or paleocurrent data that share the same GPS positions and stratigraphic horizons were given an identical code (e.g., CBC01; Table 2).…”

Section: Sampling and Sedimentary Structure Analysismentioning

confidence: 99%

“…In short, the early paleogeographic evolution of the Cathaysia block is poorly understood; the majority of previous studies focused on its basement characteristics, crustal reworking, and tectonic affinity with other terranes/blocks [39][40][41][42][43][44]. Only very limited attention has been paid to the Proterozoic sedimentary environment and the landscape configuration of the Cathaysia block [45][46][47], leaving essential gaps in our knowledge that we aim to address in this study.…”

Section: Introductionmentioning

confidence: 99%

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Did a Late Paleoproterozoic-Early Mesoproterozoic Landmass Exist in the Eastern Cathaysia Block? New Evidence from Detrital Zircon U-Pb Geochronology and Sedimentary Indicators

Huang

Grave

2022

Minerals

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The South China Craton comprises the Yangtze and Cathaysia blocks and is one of the largest Precambrian continental blocks in East Asia. However, the early geological and geographical evolution of the Cathaysia block is relatively poorly understood, due to the sparse exposure of pre-Neoproterozoic rocks and reworking during Phanerozoic polyphase magmatism and metamorphism. In this contribution, we carried out detrital zircon U-Pb geochronology and sedimentary analyses on five Proterozoic meta-sedimentary rocks collected from the northeastern Cathaysia block, which belong to the previously defined Chencai, Mayuan, and Mamianshan Groups (strata). LA-ICP-MS U-Pb dating results of the detrital zircons show various ~1.85–1.35 Ga maximum depositional ages. They are significantly older than the previously constrained Neoproterozoic formation ages of these Proterozoic strata of northeastern Cathaysia, suggesting that their deposition and formation were probably initiated as early as the late Paleoproterozoic. Provenance analyses reveal that the late Paleoproterozoic to early Mesoproterozoic detrital zircons with igneous-origin were derived from in situ contemporary crystalline basements in eastern Cathaysia. In addition, by implication, the easternmost part of Cathaysia was probably an emerged area (i.e., the “proto-Cathaysia Land”) under active erosion. It had a ~NWW orientation and provided detrital sediments to the neighboring marine basin (i.e., the Cathaysia Sea) during the late Paleoproterozoic to early Mesoproterozoic. Finally, the Paleoproterozoic evolution of Cathaysia was involved in the assembly of the Nuna supercontinent. Our results, together with the published data, reveal a distinct late Paleoproterozoic (~1.8 Ga) detrital zircon age peak, which seems to support the view that eastern Cathaysia had close tectonic affinities with terranes such as the Precambrian terranes of current northern India, in the framework of the Nuna supercontinent reconstruction.

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