| Citation: | Yuheng Qiao, Linhao Cui, Guangyuan Xing, Dongjing Fu, Chao Chang, Robert Gaines, Xingliang Zhang. Thermal History of Cambrian Burgess Shale-Type Deposits: New Insights from the Early Cambrian Chengjiang and Qingjiang Fossils of South China. Journal of Earth Science, 2024, 35(4): 1215-1223. doi: 10.1007/s12583-023-1921-2
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Burgess Shale-type deposits provide a wealth of information on the early evolution of animals. Questions that are central to understanding the exceptional preservation of these biotas and the paleoenvironments they inhabited may be obscured by the post-depositional alteration due to metamorphism at depth and weathering near the Earth's surface. Among over 50 Cambrian BST biotas, the Chengjiang and Qingjiang deposits are well known for their richness of soft-bodied taxa, fidelity of preservation, and Early Cambrian Age. While alteration via weathering has been well-investigated, the thermal maturity of the units bearing the two biotas has not yet been elucidated. Here we investigate peak metamorphic temperatures of the two deposits using two independent methods. Paleogeotemperature gradient analyses demonstrate that the most fossiliferous sections of the Chengjiang were buried at a maximum depth of ~8 500 m in the Early Triassic, corresponding to ~300 ℃, while the type area of the Qingjiang biota was buried at a maximum depth of ~8 700 m in the Early Jurassic, corresponding to ~240 ℃. Raman geothermometer analyses of fossil carbonaceous material demonstrate that peak temperatures varied across localities with different burial depth. The two productive sections of the Chengjiang biota were thermally altered at a peak temperature of approximately 300 ℃, and the main locality of the Qingjiang biota experienced a peak temperature of 238 ± 22 ℃. These results from two independent methods are concordant. Among BST deposits for which thermal maturity has been documented, the Qingjiang biota is the least thermally mature, and therefore holds promise for enriching our understanding of BST deposits.
| Anderson, E. P., Schiffbauer, J. D., Xiao, S. H., 2011. Taphonomic Study of Ediacaran Organic-Walled Fossils Confirms the Importance of Clay Minerals and Pyrite in Burgess Shale-Type Preservation. Geology, 39(7): 643–646. https://doi.org/10.1130/g31969.1 |
| Anderson, R. P., Tosca, N. J., Saupe, E. E., et al., 2021. Early Formation and Taphonomic Significance of Kaolinite Associated with Burgess Shale Fossils. Geology, 49(4): 355–359. https://doi.org/10.1130/g48067.1 |
| Aoya, M., Kouketsu, Y., Endo, S., et al., 2010. Extending the Applicability of the Raman Carbonaceous-Material Geothermometer Using Data from Contact Metamorphic Rocks. Journal of Metamorphic Geology, 28(9): 895–914. https://doi.org/10.1111/j.1525-1314.2010.00896.x |
| Beyssac, O., Goffé, B., Chopin, C., et al., 2002. Raman Spectra of Carbonaceous Material in Metasediments: A New Geothermometer. Journal of Metamorphic Geology, 20(9): 859–871. https://doi.org/10.1046/j.1525-1314.2002.00408.x |
| Beyssac, O., Goffé, B., Petitet, J. P., et al., 2003. On the Characterization of Disordered and Heterogeneous Carbonaceous Materials by Raman Spectroscopy. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 59(10): 2267–2276. https://doi.org/10.1016/S1386-1425(03)00070-2 |
| Butterfield, N. J., Balthasar, U., Wilson, L. A., 2007. Fossil Diagenesis in the Burgess Shale. Palaeontology, 50(3): 537–543. https://doi.org/10.1111/j.1475-4983.2007.00656.x |
| Chen, X. H., Luo, S. Y., Tan, J. Q., et al., 2021. Assessing the Gas Potential of the Lower Paleozoic Shale System in the Yichang Area, Middle Yangtze Region. Energy & Fuels, 35(7): 5889–5907. https://doi.org/10.1021/acs.energyfuels.1c00063 |
| Forchielli, A., Steiner, M., Kasbohm, J., et al., 2014. Taphonomic Traits of Clay-Hosted Early Cambrian Burgess Shale-Type Fossil Lagerstätten in South China. Palaeogeography, Palaeoclimatology, Palaeoecology, 398: 59–85. https://doi.org/10.1016/j.palaeo.2013.08.001 |
| Fu, D. J., Tong, G. H., Dai, T., et al., 2019. The Qingjiang Biota-a Burgess Shale-Type Fossil Lagerstätte from the Early Cambrian of South China. Science, 363(6433): 1338–1342. https://doi.org/10.1126/science.aau8800 |
| Gabbott, S. E., Hou, X. G., Norry, M. J., et al., 2004. Preservation of Early Cambrian Animals of the Chengjiang Biota. Geology, 32(10): 901–904. https://doi.org/10.1130/g20640.1 |
| Gaines, R. R., 2014. Burgess Shale-Type Preservation and Its Distribution in Space and Time. The Paleontological Society Papers, 20: 123–146. https://doi.org/10.1017/s1089332600002837 |
| Gaines, R. R., Briggs, D. E. G., Zhao, Y. L., 2008. Cambrian Burgess Shale-Type Deposits Share a Common Mode of Fossilization. Geology, 36(10): 755–758. https://doi.org/10.1130/g24961a.1 |
| Gaines, R. R., Droser, M. L., Orr, P. J., et al., 2012. Burgess Shale–Type Biotas were not Entirely Burrowed Away. Geology, 40(3): 283–286. https://doi.org/10.1130/g32555.1 |
| Hammarlund, E. U., Gaines, R. R., Prokopenko, M. G., et al., 2017. Early Cambrian Oxygen Minimum Zone-Like Conditions at Chengjiang. Earth and Planetary Science Letters, 475: 160–168. https://doi.org/10.1016/j.epsl.2017.06.054 |
| Hou, X. G., 2017. The Cambrian Fossils of the Chengjiang, China—The Flowering of Early Animal Life. In: Siveter, D. J., Siveter, D. J., Aldridge, R. J., et al., eds. Wiley Blackwell, Oxford |
| Hubei Bureau of Geology and Mineral Resources, 1996. Lithostratigraphy of Hubei Province. China University of Geosciences Press, Wuhan (in Chinese) |
| Kouketsu, Y., Mizukami, T., Mori, H., et al., 2014. A New Approach to Develop the Raman Carbonaceous Material Geothermometer for Low-Grade Metamorphism Using Peak Width. Island Arc, 23(1): 33–50. https://doi.org/10.1111/iar.12057 |
| Lahfid, A., Beyssac, O., Deville, E., et al., 2010. Evolution of the Raman Spectrum of Carbonaceous Material in Low-Grade Metasediments of the Glarus Alps (Switzerland). Terra Nova, 22(5): 354–360. https://doi.org/10.1111/j.1365-3121.2010.00956.x |
| Li, A., Ding, W. L., He, J. H., et al., 2016. Investigation of Pore Structure and Fractal Characteristics of Organic-Rich Shale Reservoirs: A Case Study of Lower Cambrian Qiongzhusi Formation in Malong Block of Eastern Yunnan Province, South China. Marine and Petroleum Geology, 70: 46–57. https://doi.org/10.1016/j.marpetgeo.2015.11.004 |
| Li, R. Y., Cui, L. H., Fu, D. J., et al., 2023. A New Red Alga Preserved with Possible Reproductive Bodies from the 518-Million-Year-Old Qingjiang Biota. Journal of Systematics and Evolution, 61(6): 1091–1101. https://doi.org/10.1111/jse.12942 |
| Liu, G. X., Luo, K. P., Peng, J. N., et al., 2010. Causes and Significance of Abnormal Thermal Evolution of Organic Matters in Changyang Area, Hubei Province. Petroleum Geology & Experiment, 32(1): 52–57, 63 (in Chinese with English Abstract) |
| Lünsdorf, N. K., Dunkl, I., Schmidt, B. C., et al., 2017. Towards a Higher Comparability of Geothermometric Data Obtained by Raman Spectroscopy of Carbonaceous Material. Part 2: A Revised Geothermometer. Geostandards and Geoanalytical Research, 41(4): 593–612. https://doi.org/10.1111/ggr.12178 |
| Luo, S. Y., Liu, A., Li, H., et al., 2019. Gas-Bearing Characteristics and Controls of the Cambrian Shuijingtuo Formation in Yichang Area, Middle Yangtze Region. Petroleum Geology & Experiment, 41(1): 56–67 (in Chinese with English Abstract) |
| Marshall, A. O., Wehrbein, R. L., Lieberman, B. S., et al., 2012. Raman Spectroscopic Investigations of Burgess shale-Type Preservation: A New Way Forward. Palaios, 27(5): 288–292. https://doi.org/10.2110/palo.2011.p11-041r |
| Muscente, A. D., Schiffbauer, J. D., Broce, J., et al., 2017. Exceptionally Preserved Fossil Assemblages through Geologic Time and Space. Gondwana Research, 48: 164–188. https://doi.org/10.1016/j.gr.2017.04.020 |
| Nielsen, M. L., Lee, M., Ng, H. C., et al., 2022. Metamorphism Obscures Primary Taphonomic Pathways in the Early Cambrian Sirius Passet Lagerstätte, North Greenland. Geology, 50(1): 4–9. https://doi.org/10.1130/g48906.1 |
| Page, A., Gabbott, S. E., Wilby, P. R., et al., 2008. Ubiquitous Burgess Shale-Style "Clay Templates" in Low-Grade Metamorphic Mudrocks. Geology, 36(11): 855–858. https://doi.org/10.1130/g24991a.1 |
| Pasquier, V., Fike, D. A., Révillon, S., et al., 2022. A Global Reassessment of the Controls on Iron Speciation in Modern Sediments and Sedimentary Rocks: A Dominant Role for Diagenesis. Geochimica et Cosmochimica Acta, 335: 211–230. https://doi.org/10.1016/j.gca.2022.08.037 |
| Qi, C. S., Li, C., Gabbott, S. E., et al., 2018. Influence of Redox Conditions on Animal Distribution and Soft-Bodied Fossil Preservation of the Lower Cambrian Chengjiang Biota. Palaeogeography, Palaeoclimatology, Palaeoecology, 507: 180–187. https://doi.org/10.1016/j.palaeo.2018.07.010 |
| Rahl, J. M., Anderson, K. M., Brandon, M. T., et al., 2005. Raman Spectroscopic Carbonaceous Material Thermometry of Low-Grade Metamorphic Rocks: Calibration and Application to Tectonic Exhumation in Crete, Greece. Earth and Planetary Science Letters, 240(2): 339–354. https://doi.org/10.1016/j.epsl.2005.09.055 |
| Saleh, F., Qi, C. S., Buatois, L. A., et al., 2022. The Chengjiang Biota Inhabited a Deltaic Environment. Nature Communications, 13: 1569. https://doi.org/10.1038/s41467-022-29246-z |
| Slotznick, S. P., Eiler, J. M., Fischer, W. W., 2018. The Effects of Metamorphism on Iron Mineralogy and the Iron Speciation Redox Proxy. Geochimica et Cosmochimica Acta, 224: 96–115. https://doi.org/10.1016/j.gca.2017.12.003 |
| Topper, T. P., Greco, F., Hofmann, A., et al., 2018. Characterization of Kerogenous Films and Taphonomic Modes of the Sirius Passet Lagerstätte, Greenland. Geology, 46(4): 359–362. https://doi.org/10.1130/g39930.1 |
| Wang, H. J., Liu, G. X., 2011. Distribution and Evolution of Thermal Field in Middle and Upper Yangtze Region. Petroleum Geology & Experiment, 33(2): 160–164 (in Chinese with English Abstract) |
| Wang, Y., 2015. The Research of Shale Gas Accumulation Characteristics of the Qiongzhusi Formation, Qujing Area, Eastern Yunnan Province: [Dissertation]. University of Mining & Technology, Xuzhou (in Chinese with English Abstract) |
| Wang, Z., Wang, J. S., Kouketsu, Y., et al., 2017. Raman Geothermometry of Carbonaceous Material in the Basal Ediacaran Doushantuo Cap Dolostone: The Thermal History of Extremely Negative δ13C Signatures in the Aftermath of the Terminal Cryogenian Snowball Earth Glaciation. Precambrian Research, 298: 174–186. https://doi.org/10.1016/j.precamres.2017.06.013 |
| Wei, S. L., He, S., Pan, Z. J., et al., 2020. Characteristics and Evolution of Pyrobitumen-Hosted Pores of the Overmature Lower Cambrian Shuijingtuo Shale in the South of Huangling Anticline, Yichang Area, China: Evidence from FE-SEM Petrography. Marine and Petroleum Geology, 116: 104303. https://doi.org/10.1016/j.marpetgeo.2020.104303 |
| Yunnan Bureau of Geology and mineral Resources., 1996. Lithostratigraphy of Yunnan Province. China University of Geosciences Press, Wuhan (in Chinese) |
| Zhang, X. L., Ahlberg, P., Babcock, L. E., et al., 2017. Challenges in Defining the Base of Cambrian Series 2 and Stage 3. Earth-Science Reviews, 172: 124–139. https://doi.org/10.1016/j.earscirev.2017.07.017 |
| Zhang, X. L., Liu, W., Zhao, Y. L., 2008. Cambrian Burgess Shale-Type Lagerstätten in South China: Distribution and Significance. Gondwana Research, 14(1/2): 255–262. https://doi.org/10.1016/j.gr.2007.06.008 |
| Zhang, X. L., Shu, D. G., 2005. A New Arthropod from the Chengjiang Lagerstätte, Early Cambrian, Southern China. Alcheringa: An Australasian Journal of Palaeontology, 29(2): 185–194. https://doi.org/10.1080/03115510508619300 |
| Zhang, X. L., Shu, D. G., Li, Y., et al., 2001. New Sites of Chengjiang Fossils: Crucial Windows on the Cambrian Explosion. Journal of the Geological Society, 158(2): 211–218. https://doi.org/10.1144/jgs.158.2.211 |
| Zheng, S. C., Feng, Q. L., van de Velde, S., et al., 2022. Microfossil Assemblages and Indication of the Source and Preservation Pattern of Organic Matter from the Early Cambrian in South China. Journal of Earth Science, 33(3): 802–819. https://doi.org/10.1007/s12583-020-1117-0 |
| Zhu, M. Y., Yang, A. H., Yuan, J. L., et al., 2019. Cambrian Integrative Stratigraphy and Timescale of China. Science China Earth Sciences, 62(1): 25–60. https://doi.org/10.1007/s11430-017-9291-0 |
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