Late Devonian events in open ocean environments: examples from Mongolia

公海环境中的晚泥盆世事件:来自蒙古的例子

基本信息

  • 批准号:
    426055092
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    德国
  • 项目类别:
    Research Grants
  • 财政年份:
    2019
  • 资助国家:
    德国
  • 起止时间:
    2018-12-31 至 2023-12-31
  • 项目状态:
    已结题

项目摘要

Late Devonian oceanic anoxia with extinction events have been considered ubiquitous, and ocean anoxia has been the accepted “driving force” for these marine mass extinctions. However, there is still debate about the cause/effect relationship between anoxia and extinction in the Devonian, as the epeiric seas and tectonic basins of eastern North America and Europe generally show a close association between the two, but sites elsewhere do not. Thus, our current knowledge for instance of the F/F Event and Hangenberg Crisis is limited by significant sampling bias, as most previous studies sampled equatorial epicontinental seaways or passive continental shelves, primarily from localities across Europe and North America. Thus, there is still the need to study events in many differing expressions to fully comprehend the mechanisms of global ocean anoxia and extinction, and determine the trigger mechanism(s). The Central Asian Orogenic Belt (CAOB) is a yet grossly understudied part of the story of the Late Devonian extinctions and ecosystem rebound from extinctions. That was the reason, we went to Mongolia where we studied new field sites (open ocean), in different terranes (Baruunhuurai Terrane and on the Mandalovoo– /Gurvansayhan Terrane) were these events are not necessarily associated with black shales and/or bituminous dark limestone facies. As a step towards addressing problems of palaeogeographic sample bias, biostratigraphy, biodiversity changes in the aftermath of the F/F events and the Hangenberg Crisis we could present new results from shallow-subtidal to outer ramp settings and open ocean settings within the CAOB which are important contributions to understand biodiversity patterns in isolated ecosystems during a time of global climate changes and intensive volcanic activity, which may have led to significant changes in the global climate and biosphere. But we had to deal with some limitations due to scarce conodont fauna and high physical stress environment with frequent and often voluminous pyroclastic eruptions, both hampered detailed stratigraphic records around proposed equivalents of event layers. Thus, it is planned to study new sections in the Shine-Jinst area in southern Mongolia which belong most probably to the Mandalovoo-Terrane and are therefore comparable with the Bayankhohuu Ruins section, but much likely containing better conodont-fauna. Do the estimated sea surface temperatures (SST) during a time of global climate change considerably differ from areas published elsewhere, such as in epeiric seaways and/or continental shelf deposits in site across Europe and North America? Conodonts will be used to perform carbon and oxygen isotopes around the event layers (also from earlier field campaigns) to address this aspect and compare the results with published data.
晚泥盆世海洋缺氧与生物灭绝事件被认为是普遍存在的,海洋缺氧已被公认为这些海洋生物灭绝的“驱动力”。然而,关于泥盆纪缺氧和灭绝之间的因果关系仍然存在争议,因为北美东部和欧洲的陆表海和构造盆地通常显示出两者之间的密切联系,但其他地方的地点则没有。因此,我们目前的知识,例如F/F事件和Hangenberg危机是有限的显着的采样偏差,因为大多数以前的研究采样赤道陆表海航道或被动大陆架,主要来自欧洲和北美的地方。因此,仍然需要研究许多不同表现形式的事件,以充分理解全球海洋缺氧和灭绝的机制,并确定触发机制。中亚造山带(CAOB)是晚泥盆世构造和生态系统从构造反弹的故事的一个尚未充分研究的部分。这就是为什么,我们去了蒙古,在那里我们研究了新的野外地点(开阔的海洋),在不同的火山岩(Baruunhuurai Terrane和Mandalovoo- /Gurvansayhan Terrane)上,这些事件不一定与黑色页岩和/或沥青黑色石灰岩相有关。作为解决F/F事件和Hangenberg危机之后的古地理样本偏差、生物地层学、生物多样性变化等问题的一步,我们可以在CAOB内提出从潮下浅海到外斜坡环境和开阔洋环境的新结果,这些结果对了解全球气候变化和火山活动密集时期孤立生态系统中的生物多样性模式有重要贡献。这可能导致了全球气候和生物圈的重大变化。但是,由于牙形石动物群稀少和高物理应力环境以及频繁且经常大量的火山碎屑喷发,我们不得不处理一些限制,这两个因素都阻碍了详细的地层记录。因此,计划研究蒙古南部Shine-Jinst地区的新剖面,这些剖面最有可能属于Mandalovoo地体,因此与Bayankhohuu遗址剖面具有可比性,但很可能包含更好的牙形石动物群。全球气候变化期间的估计海表温度(SST)是否与其他地方公布的地区(例如欧洲和北美的陆表水道和/或大陆架沉积)有很大差异?牙形刺将被用来执行碳和氧同位素周围的事件层(也从早期的现场活动),以解决这方面的问题,并将结果与公布的数据进行比较。

项目成果

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Dr. Peter Königshof其他文献

Dr. Peter Königshof的其他文献

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{{ truncateString('Dr. Peter Königshof', 18)}}的其他基金

Carbon and oxygen isotope record and sedimentology/facies across selected time slices in the Mid Paleozoic in Vietnam
越南中古生代选定时间片的碳和氧同位素记录和沉积学/相
  • 批准号:
    262627513
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Anchient jawed polychates: evolution and palaeogeography in the Lower Palaeozoic
古代有颌多毛类动物:下古生代的演化和古地理
  • 批准号:
    511973862
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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进入冰库:泥盆纪-密西西比纪气候转变(DMCT)的巨大变化
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Gross biological analysis of Devonian Rhynie Chert flora using innovative observation method
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    23H02544
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    2023
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    2022
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The Devonian Gogo Fauna: Diversity, Palaeoecology and Global Significance
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泥盆系地球化学数据的主成分分析
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Collaborative Research: RUI: "CSI Devonian" - testing Late Devonian ocean anoxia proxies across different paleoenvironments
合作研究:RUI:“CSI Devonian” - 测试不同古环境中的晚泥盆世海洋缺氧代理
  • 批准号:
    2044222
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Collaborative Research: RUI: "CSI Devonian" - testing Late Devonian ocean anoxia proxies across different paleoenvironments
合作研究:RUI:“CSI Devonian” - 测试不同古环境中的晚泥盆世海洋缺氧代理
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