寒武纪早期海洋阶段性氧化驱动早期后生动物多样化进程

赵相宽; 史晓颖; 王新强; 汤冬杰

doi:10.3799/dqkx.2018.143

Volume 43 Issue 11

Nov. 2018

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Article Navigation > Earth Science > 2018 > 43(11): 3873-3890

Zhao Xiangkuan, Shi Xiaoying, Wang Xinqiang, Tang Dongjie, 2018. Stepwise Oxygenation of Early Cambrian Ocean Drove Early Metazoan Diversification. Earth Science, 43(11): 3873-3890. doi: 10.3799/dqkx.2018.143

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Zhao Xiangkuan, Shi Xiaoying, Wang Xinqiang, Tang Dongjie, 2018. Stepwise Oxygenation of Early Cambrian Ocean Drove Early Metazoan Diversification. Earth Science, 43(11): 3873-3890. doi: 10.3799/dqkx.2018.143

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Stepwise Oxygenation of Early Cambrian Ocean Drove Early Metazoan Diversification

doi: 10.3799/dqkx.2018.143

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
3.
School of Scientific Research, China University of Geosciences, Beijing 100083, China

Received Date: 2018-04-17
Publish Date: 2018-11-15

Abstract

Abstract

Ediacaran-Cambrian transition is a critical period in Earth history, during which both marine environment and life have experienced drastic changes. It is arguably suggested that pervasive oxygenation and associated geochemical changes in the ocean have potentially driven the rapid diversification of Early Cambrian metazoans, however, the timing and process of ocean oxygenation have not been well constrained. In this paper, an integrated study was conducted on the Lower Cambrian Niutitang (NTT) Fm. in Siduping area, West Hunan and Songjiang Bridge area, East Guizhou, which were paleogeographically situated at the shelf margin-upper slope setting of the Yangtze block. Using ICP-MS, FESEM, EDS and XRD techniques, the abundances and patterns of RSE (redox sensitive elements), pyrite morphology, TOC (total organic carbon), as well as N, P nutrients were investigated systematically. The results show that during NTT deposition, bottom seawaters in the study area experienced a complicated evolution, with a dynamic alternation of 3 ferruginous and 3 euxinic intervals, and suboxic-oxic conditions occurring only at the latest Cambrian Stage 3. Comparison with relevant data published previously from each facies belts within the Yangtze block shows that the seawater oxygenation was a progressive process expanding from shallow water area to deep-water area in time. Platform facies area oxygenated at the late Stage 2, shelf margin area in the late Stage 3, and the deep-water basin kept ferruginous until the latest Stage 3, when it became euxinic. Sediment Mo/TOC, U/TOC ratios increased from bottom to top consecutively in the section, coupled with elevated Cr, Mn, N and P secular trends, likely indicating an overall enhancement of seawater oxygenation. The spatial-temporal distribution and increased paleoecologic complexity of major fossil groups in the Yangtze block over time show a well coincidence with the seawater oxygenation process, likely implying that increased ocean oxygenation and declined euxinic seawaters have facilitated the rapid diversification of Early Cambrian metazoans.
- framboidal pyrite,
- redox sensitive element,
- sea-water Mo-U inventory,
- Niutitang Formation,
- Yangtze platform,
- biostratigraphy

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Stepwise Oxygenation of Early Cambrian Ocean Drove Early Metazoan Diversification

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