Ji, K, Wignall, PB orcid.org/0000-0003-0074-9129, Peakall, J orcid.org/0000-0003-3382-4578 et al. (3 more authors) (2021) Unusual intraclast conglomerates in a stormy, hot‐house lake: The Early Triassic North China Basin. Sedimentology. sed.12903. ISSN 0037-0746
Abstract
Early Triassic temperatures were some of the hottest of the Phanerozoic, sea-surface temperatures approached 40°C, with profound consequences for both the sedimentology and faunal distributions in the oceans. However, the impact of these temperatures in terrestrial settings is unclear. This study examines shallow lacustrine sediments from the Lower Triassic succession of North China. These consist of diverse fluvial to shallow lacustrine sandstones and also spectacular, coarse conglomerates composed of diverse, intraformational clasts reworked from the interbedded sediments. The conglomerate beds can show inverse grading and high angle, flat-pebble imbrication in their lower part and vertically orientated flat pebbles in their upper part. The cobbles include cemented and reworked conglomerate intraclasts and sandstone concentrically-laminated concretions that record multi-step histories of growth and reworking, pointing to rapid cementation of the sandy lake bed (likely facilitated by high temperatures). The conglomerates record frequent, high-energy events that were capable of brecciating a lithified lake bed and transporting cobbles in wave-influenced sediment-gravity flows. Initially, powerful oscillatory flows brecciated and deflated the lake bed and subsequently helped to sustain turbulence during short-distance lateral flow. It is possible that hurricanes, originating from the adjacent hyper-warm, Palaeo-Tethyan Ocean travelled into the major lakes of the North China continent during the Early Triassic.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | This is protected by copyright. All rights reserved. This is the peer reviewed version of the following article: Ji, K., Wignall, P.B., Peakall, J., Tong, J., Chu, D. and Pruss, S.B. (2021), Unusual intraclast conglomerates in a stormy, hot-house lake: The Early Triassic North China Basin. Sedimentology., which has been published in final form at https://doi.org/10.1111/sed.12903. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. |
Keywords: | Conglomerates; early Triassic; North China; storms; terrestrial |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 24 Aug 2021 10:49 |
Last Modified: | 01 Jun 2022 00:38 |
Status: | Published online |
Publisher: | Wiley |
Identification Number: | 10.1111/sed.12903 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:177194 |