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首页> 外文期刊>GSA Bulletin >Phosphogenesis, carbon-isotope stratigraphy, and carbonate-platform evolution along the Lower Cretaceous northern Tethyan margin
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Phosphogenesis, carbon-isotope stratigraphy, and carbonate-platform evolution along the Lower Cretaceous northern Tethyan margin

机译：下白垩统北部特提斯边缘的成岩作用，碳同位素地层和碳酸盐台地演化

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摘要

We distinguish three different stages in the evolution of the Tithonian (Late Jurassic) to Aptian (Early Cretaceous) northern Tethyan carbonate platform: (1) carbonate production in the coral-oolite mode (late Tithonian to early Valanginian, early Barremian to early Aptian), (2) carbonate production in the crinoid-bryozoan mode (early Valanginian, Haute-rivian, late Aptian), and (3) platform retrogradation and destruction, condensation,and phosphogenesis (that is, platform drowning; early Valanginian to early Hauterivian,middle Hauterivian, late Hauterivian to early Barremian, early to early late Aptian, and latest Aptian to earliest Albian). Transitions from the coral-oolite mode to the crinoid-bryozoan mode and consequently to platform drowning may have been driven by increases in nutrient levels on the shelf. Phases of relative sea- level rise in times of carbonate production in the coral-oolite mode are named constructive, because of the observed platform regeneration following phases of widespread emersion during late sea-level highstands. In contrast,phases of relative sea-level rise in times of platform drowning are termed destructive. The 13C stratigraphies obtained from Valanginian-Hauterivian and Aptian-Albian hemipelagic successions beyond the platform correlate well with the Early Cretaceous pelagic 13C record. Positive excursions in the pelagic 13C record correspond in time to episodes of platform drowning. This suggests the existence of a coupling mechanism between changes in the global carbon cycle and platform drowning. In our view, the Early Cretaceous crises in carbonate-platform growth were the consequence of reinforced greenhouse conditions, which may have been triggered by episodes of extensive, flood-basalt volcanism. Strong greenhouse conditions may have induced the following chain of feedback mechanisms, enabling the biosphere to return to normal conditions: climate warming " BORDER="0"> sea-level rise, accelerated water cycle, intensified weathering " BORDER="0"> nutrient mobilization " BORDER="0"> platform destruction, increased productivity increased phosphogenesis and carbon burial " BORDER="0"> weakened greenhouse conditions.
机译：我们将 Tithonian（晚侏罗纪）到Aptian（早白垩世）北部的特提斯碳酸盐台地演化分为三个不同的阶段：（1） 珊瑚-卵石模式（蒂通尼晚期至瓦朗吉尼早期， 巴雷米亚早期至Aptian早期），（2） 类海藻-苔藓石模式（早瓦朗吉尼期） ，Haute-rivian，晚期 Aptian）和（3）平台逆转和破坏，凝结和 磷生成（即平台淹没；早期的Valanginian 到早期的Hauterivian，中层的Hauterivian，晚期的Hauterivian到 早期的Barremian，早期到晚期的Aptian，以及最新的Aptian 到最早的Albian）。从珊瑚-卵石模式 到海百合-苔藓虫模式的过渡，进而到平台溺水 的转变，可能是由于 架。在珊瑚-卵石模式下，碳酸盐 产生的时间相对海平面上升的阶段被称为建设性的， ，因为在 在后期海平面高潮中出现的广泛浮现。与 相反，平台 淹没时相对海平面上升的阶段被称为破坏性的。 13 C从平台上方的瓦朗基尼-上特里夫安 和阿普特-阿尔本半潜相继获得的地层学与白垩纪上层 13 C记录具有很好的相关性。 中上层 13 C记录中的正向偏移在 时间内对应于平台溺水事件。这表明在全球碳 周期变化与平台淹没之间存在耦合机制。我们认为，碳酸盐平台生长的早期白垩纪 危机是 增强的温室条件的结果，温室条件可能是由 事件触发的。广泛的洪水玄武岩火山活动。强烈的温室 条件可能引起了以下反馈链 机制，使生物圈恢复到正常条件： 气候变暖“ BORDER =” 0 “>海平面上升，加速水循环，增强 风化” BORDER =“ 0”>养分动员“ BORDER =” 0“>平台破坏，增加 生产率提高了磷的生成和碳埋葬“ BORDER =” 0“>削弱了 温室条件。

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  • 来源
    《GSA Bulletin》 |1994年第6期|729-746|共18页
  • 作者

    KARL B. F?LLMI; HELMUT WEISSERT; MARTIN BISPING; HANSPETER FUNK;

  • 作者单位

    Geological Institute, ETH Center, CH-8092 Zürich, Switzerland;

    Geological Institute, ETH Center, CH-8092 Zürich, Switzerland;

    Geological Institute, ETH Center, CH-8092 Zürich, Switzerland;

    Geological Institute, ETH Center, CH-8092 Zürich, Switzerland;

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