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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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China
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North China Platform (1)
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Sichuan China (1)
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Primary terms
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Glacially influenced provenance and Sturtian affinity revealed by detrital zircon U–Pb ages from sandstones in the Port Askaig Formation, Dalradian Supergroup
Modelling sulfate concentrations in the global ocean through Phanerozoic time
Chapter 6 Chemostratigraphy: using elements and isotopes to identify, interpret and correlate events in strata
The 1126 Ma volcanic event in the Dechang Area, SW Yangtze Block, and its significance
A template for an improved rock-based subdivision of the pre-Cryogenian timescale
Revisiting stepwise ocean oxygenation with authigenic barium enrichments in marine mudrocks
The Ediacaran ‘Miaohe Member’ of South China: new insights from palaeoredox proxies and stable isotope data
Evaporite weathering and deposition as a long-term climate forcing mechanism
Reconstructing Tonian seawater 87 Sr/ 86 Sr using calcite microspar
Measuring the ‘Great Unconformity’ on the North China Craton using new detrital zircon age data
Abstract New detrital zircon ages confirm that the Neoproterozoic strata of the southeastern North China Craton (NCC) are mostly of early Tonian age, but that the Gouhou Formation, previously assigned to the Tonian, is Cambrian in age. A discordant hiatus of >150–300 myr occurs across the NCC, spanning most of the late Tonian, Cryogenian, Ediacaran and early Cambrian periods. This widespread unconformable surface is akin to the Great Unconformity seen elsewhere in the world and highlights a major shift in depositional style from largely erosional, marked by low rates of net deposition, during the mid- to late Neoproterozoic to high rates of transgressive deposition during the mid- to late Cambrian. The age spectra for the southeastern NCC and northern India are consistent with a provenance affinity linking the NCC and East Gondwana by c. 510 Ma. Supplementary material: Sample descriptions, sampling GPS locations and a compiled dataset of detrital zircon U–Pb LA-ICP-MS dating results are available at https://doi.org/10.6084/m9.figshare.c.3571119
Earth system transition during the Tonian–Cambrian interval of biological innovation: nutrients, climate, oxygen and the marine organic carbon capacitor
Abstract The Tonian–Cambrian interval ( c. 0.9–0.5 Ga) witnessed major tectonic, climatic and chemical changes to the Earth system and culminated in the Ediacaran–Cambrian radiation of animals. Negative carbon isotope (δ 13 C) excursions of extraordinary magnitude form the backdrop to all these events and are consistent with the presence of a vast marine organic carbon reservoir that changed its size due to periodic imbalances between organic production (as an oxidant source) and terrestrial oxidant sinks. Prior to both Cryogenian glaciations, this pool of long-lived organic carbon may have become substantially depleted, leading to a weakening of the regulation of climate and oxygen. The late Ediacaran Shuram anomaly probably represents a third depletion event, which was followed by oxygenation and the Ediacaran–Cambrian radiation. The evolutionary diversification of animals shortened the ocean residence time of organic carbon and introduced new carbon cycle feedbacks that together helped to mould the modern Earth system.
Martin Brasier’s contribution to the palaeobiology of the Ediacaran–Cambrian transition
Abstract Martin Brasier’s work spanned almost the entire geological column, but the origin of animals and the nature of the Cambrian explosion were areas of particular interest to him. Martin adopted a holistic approach to the study of these topics that considered the interplay between multiple geological and biological phenomena and he sought to interpret the fossil record within the broad context of geological, biogeochemical and ecological changes in the Earth system. Here we summarize Martin’s main contributions to this area of research and assess the impact of his findings on the development of this field.