Stratigraphic controls of soft-bodied fossil occurrences in the Cambrian Chengjiang Biota Lagerstätte, Maotianshan Shale, Yunnan Province, China

MacKenzie, Lindsay Ann; Hofmann, Michaël; Chen, Jun-Yuan; Hinman, Nancy W.

doi:10.1016/j.palaeo.2014.11.006

Cited by 10 publications

(15 citation statements)

References 37 publications

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“…Recent detailed sedimentologic studies have demonstrated a time transgressive relationship between the different fossil locations in the Maotianshan Shale (MacKenzie et al, 2015). Our data, although rattled by some uncertainty, supports these findings from this previous study, suggesting a slightly older depositional age to the northwest and younger depositional age to the southeast.…”

Section: Local Provincessupporting

confidence: 87%

“…Xu et al, 2012), contributing to the ongoing discussion about the provenance and depositional environment of the Maotianshan Shale (e.g. Hou, 1987;Chen and Erdtman, 1991;Pu et al, 1992;Zhu et al, 2001;Hu, 2005;Zhao et al, 2012;MacKenzie et al, 2015).…”

Section: Figure1mentioning

confidence: 99%

“…The main fossil intervals are associated with the middle and upper part of the Maotianshan Shale and highlighted by the black bars. Numbers 1-4 mark the inferred stratigraphic position of the zircon samples presented in this study, based on stratigraphic correlations by MacKenzie et al (2015). 1 -sample JS4/4 (Jianshan section); 2 -sample HO-20130512JS (Jianshan section); 3 -sample LM-24 (Shankou section); 4 -sample LM-23-12 (Xiaolantian section).…”

Section: Figure2mentioning

confidence: 99%

“…The most reliable chemical information included in this study comes from the analysis of trace elements that are commonly immobile and therefore preserve the original depositional conditions most accurately. We systematically separated the different lithofacies identified in the Maotianshan Shale (MacKenzie at al., 2015), to compare the reliability of provenance information preserved in these different rock types.…”

Section: Chemical Analysismentioning

confidence: 99%

“…Figure 13: Paleogeographic map of the study area and the inferred different source areas for the Maotianshan Shale. The inferred shoreline for the Maotianshan Shale (dashed line) was located parallel to the Song Ma fault (2) and the outline of the Kangdian paleoland (dotted pattern; outline from Wang et al, 1985), respectively (shoreline position modified from MacKenzie et al, 2015). Local variations in composition are explained by the presence of an inferred drainage divide that paralleled the southern splay of the present day Anninghe fault (1).…”

Section: Local Provincesmentioning

confidence: 99%

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Provenance and temporal constraints of the Early Cambrian Maotianshan Shale, Yunnan Province, China

Hofmann

Chen

et al. 2016

Gondwana Research

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The Cambrian Maotianshan Shale in Yunnan Province, China contains the well-preserved soft-body fossils of the Chengjiang Biota. The high quality preservation of the non-mineralizing biota (soft tissues and whole carcasses) shows regional and temporal differences, suggesting that paleogeography and local environmental conditions might have contributed to the taphonomy of these fossils. In this paper we present new results from petrographic, geochemical and detrital zircon analyses, and provide a new interpretation about the provenance of the Maotianshan Shale, as well as add to the understanding of the paleogeography of the South China Block during the Cambrian Stage 3. Results from petrographic analysis indicate that the provenance of the Maotianshan Shale is a recycled orogen overall, bordering the western and southwestern margin on the Yangtze Block. The most likely source of the terrigenous material is an exhumed area extending from the Kangdian paleoland to the southeast, paralleling the Song Ma fault zone. Minor regional differences in geochemical and petrographic proxies between the northwestern Jianshan/Ercai area and the southeastern Maotianshan/Xiaolantian area suggest influence of local sources. Sediments of the southeastern province are less mature and samples include minor elements commonly associated with mafic sources. Sediments from the northwestern province are more mature, largely lack mafic components and are enriched in Zr and Hf. The major population of the Maotianshan Shale detrital zircons group at ~800Ma. This crystallization age matches © 2015. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/well with the age of a widely spread felsic volcanic and intrusive event associated with the Neoproterozoic Kangdian rift, suggesting that these igneous rocks are most likely a major provenance for the Maotianshan sediments. The youngest zircon population yields consistent Concordia ages of ~520 Ma, representing a maximum age constraint on the timing of deposition of the Maotianshan Shale. The zircon crystals of the ~520 Ma populations are euhedral with magmatic zoning, indicative of short-distance transport. Volcanic activity along the Song Ma suture zone is a potential source for the ~520Ma detrital zircon suite.

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Section: Local Provincessupporting

confidence: 87%

Section: Figure1mentioning

confidence: 99%

Section: Figure2mentioning

confidence: 99%

Section: Chemical Analysismentioning

confidence: 99%

Section: Local Provincesmentioning

confidence: 99%

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Provenance and temporal constraints of the Early Cambrian Maotianshan Shale, Yunnan Province, China

Hofmann

Chen

et al. 2016

Gondwana Research

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The Lower Ordovician Fezouata Konservat-Lagerstätte from Morocco: Age, environment and evolutionary perspectives

et al. 2016

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The Lower Ordovician Fezouata Konservat-Lagerstätte from southern Morocco has been one of the major palaeontological discoveries of the last decade. It provides a unique insight into one of the most critical periods in the evolution of marine life: the Cambrian-Ordovician transition. However, its potential for deciphering key trends in animal diversification was hitherto largely limited by major uncertainties concerning its stratigraphic position, age and environmental setting. Based on extensive fieldwork, fossil evidence, and facies recognition, our study provides clarification on these three crucial issues. Exceptional preservation is limited to two intervals within the Fezouata Shale. Graptolites indicate a late Tremadocian age for the Fezouata Konservat-Lagerstätte as a whole, which is supported by biostratigraphical evidence provided by acritarchs. Sedimentological features and reconstructed patterns of relative sea-level changes indicate relatively shallow-water environmental conditions, under distal storm influence, in an offshore to lower shoreface siliciclastic ramp setting. The Fezouata Biota represents a unique and exceptional window into the palaeobiodiversity in open-marine conditions, thus contrasting with the other Ordovician Konservat-Lagerstätten presently known. In our analyses of this new set of data, we pave the way for accurate temporal, faunal and environmental comparisons with other Lower Palaeozoic Konservat-Lagerstätten, and unlock the full potential of the Fezouata Biota to better understand the processes and scenarios of early animal radiations.

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Comparisons between Cambrian Lagerstätten assemblages using multivariate, parsimony and Bayesian methods

2018

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Exceptional fossil deposits exhibiting soft-part preservation, or Konservat-Lagerstätten, are particularly prevalent in Cambrian rocks and provide detailed information on fossil assemblages not available from conventional deposits. It has long been recognised that many of these assemblages exhibit certain taxonomic similarities, with many elements seemingly having cosmopolitan distributions. These types of assemblages, particularly those of Cambrian age, have become known as Burgess Shale-type (BST) biotas, named for the famous deposit in the Canadian Rocky Mountains where fossils preserved in this way were first discovered. This study provides the first broad-scale analysis of the taxonomic relationships between

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Stratigraphic controls of soft-bodied fossil occurrences in the Cambrian Chengjiang Biota Lagerstätte, Maotianshan Shale, Yunnan Province, China

Cited by 10 publications

References 37 publications

Provenance and temporal constraints of the Early Cambrian Maotianshan Shale, Yunnan Province, China

Provenance and temporal constraints of the Early Cambrian Maotianshan Shale, Yunnan Province, China

The Lower Ordovician Fezouata Konservat-Lagerstätte from Morocco: Age, environment and evolutionary perspectives

Comparisons between Cambrian Lagerstätten assemblages using multivariate, parsimony and Bayesian methods

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