Cenozoic carbonate burial along continental margins
Cenozoic carbonate burial along continental margins
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DOI：
10.1130/g46418.1
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发表时间：
2019-09
期刊：
影响因子：
5.8
通讯作者：
R. Ploeg;B. Boudreau;J. Middelburg;A. Sluijs
中科院分区：
文献类型：
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作者：
R. Ploeg;B. Boudreau;J. Middelburg;A. Sluijs
海洋碳酸盐埋藏是地球表面最大的长期碳汇，既发生在深海（远洋）环境中，也发生在沿着大陆边缘的较浅沃茨中。碳酸盐岩的分布在地质历史上发生了变化，并影响了碳循环和海洋化学，但仍然难以定量限制。在这里，我们重建新生代碳酸盐埋藏沿着大陆边缘使用全球碳酸盐碱度的质量平衡，它集成了独立的估计大陆风化和远洋碳酸盐埋藏。我们的研究结果表明，边缘碳酸盐埋藏的主要变化与重要的气候和海平面变化事件，包括始新世-渐新世过渡（约。34 Ma），渐新世-中新世界线Mi-1冰川作用（约. 23 Ma），以及中中新世气候转变（约。14 Ma）。此外，我们发现，大陆风化的主要增加，从约。10 Ma到现在可能驱动了远洋碳酸盐埋藏的伴随增加。总之，我们的研究结果表明，全球气候，海平面和大陆风化的变化都影响了新生代碳酸盐埋藏，但这些过程的相对重要性可能会随着时间的推移而变化。
Marine carbonate burial represents the largest long-term carbon sink at Earth’s surface, occurring in both deep-sea (pelagic) environments and shallower waters along continental margins. The distribution of carbonate accumulation has varied over geological history and impacts the carbon cycle and ocean chemistry, but it remains difficult to quantitatively constrain. Here, we reconstruct Cenozoic carbonate burial along continental margins using a mass balance for global carbonate alkalinity, which integrates independent estimates for continental weathering and pelagic carbonate burial. Our results indicate that major changes in marginal carbonate burial were associated with important climate and sea-level change events, including the Eocene-Oligocene transition (ca. 34 Ma), the Oligocene-Miocene boundary Mi-1 glaciation (ca. 23 Ma), and the middle Miocene climate transition (ca. 14 Ma). In addition, we find that a major increase in continental weathering from ca. 10 Ma to the present may have driven a concomitant increase in pelagic carbonate burial. Together, our results show that changes in global climate, sea level, and continental weathering have all impacted carbonate burial over the Cenozoic, but the relative importance of these processes may have varied through time.