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首页> 外文期刊>Paleoceanography >Biogenic sedimentation in the equatorial Pacific: Carbon cycling and paleoproduction, 12-24 Ma
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Biogenic sedimentation in the equatorial Pacific: Carbon cycling and paleoproduction, 12-24 Ma

机译：赤道太平洋的生物成因沉积：碳循环和古生产，12-24 Ma

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摘要

The equatorial Pacific is an important part of the global carbon cycle and has been affected by climate change through the Cenozoic (65Ma to present). We present a Miocene (12-24Ma) biogenic sediment record from Deep Sea Drilling Project (DSDP) Site 574 and show that a CaCO _3 minimum at 17Ma was caused by elevated CaCO _3 dissolution. When Pacific Plate motion carried Site 574 under the equator at about 16.2Ma, there is a minor increase in biogenic deposition associated with passing under the equatorial upwelling zone. The burial rates of the primary productivity proxies biogenic silica (bio-SiO _2) and biogenic barium (bio-Ba) increase, but biogenic CaCO _3 decreases. The carbonate minimum is at～17Ma coincident with the beginning of the Miocene climate optimum; the transient lasts from 18 to 15Ma. Bio-SiO _2 and bio-Ba are positively correlated and increase as the equator was approached. C _(org) is poorly preserved, and is strongly affected by changing carbonate burial. Terrestrial ~(232)Th deposition, a proxy for aeolian dust, increases only after the Site 574 equator crossing. Since surface production of bio-SiO _2, bio-Ba, and CaCO _3 correlate in the modern equatorial Pacific, the decreased CaCO _3 burial rate during the Site 574 equator crossing is driven by elevated CaCO _3 dissolution, representing elevated ocean carbon storage and elevated atmospheric CO _2. The length of the 17Ma CaCO _3 dissolution transient requires interaction with a slow part of the carbon cycle, perhaps elevated mantle degassing associated with the early stages of Columbia River Basalt emplacement.
机译：赤道太平洋是全球碳循环的重要组成部分，并受到新生代（至今65Ma）气候变化的影响。我们提供了深海钻探项目（DSDP）站点574的中新世（12-24Ma）生物成因沉积物记录，并显示17Ma处的CaCO _3最小值是由CaCO _3溶解度升高引起的。当太平洋板块运动在约16.2Ma处在赤道下方运载着574站时，与越过赤道上升流区相关的生物成因沉积量略有增加。初级生产力代理人的埋葬率增加了生物硅（bio-SiO _2）和生物钡（bio-Ba），但生物CaCO _3降低。与中新世最佳气候的开始相一致，碳酸盐最低值在〜17Ma。瞬变持续时间从18到15Ma。 Bio-SiO _2和bio-Ba正相关，随着赤道的增加而增加。 C _（org）保存不佳，并且受碳酸盐埋藏变化的强烈影响。陆地〜（232）Th沉积是风沙尘埃的替代物，仅在站点574赤道穿越后才增加。由于在现代赤道太平洋中生物-SiO _2，生物-Ba和CaCO _3的表面产量相关，因此在574赤道穿越时CaCO _3埋藏率的下降是由CaCO _3溶解度升高驱动的，这表示海洋碳储存量增加和大气CO _2。 17Ma CaCO _3溶解瞬变的长度需要与碳循环的较慢部分相互作用，这可能与哥伦比亚河玄武岩沉积早期有关的地幔脱气增加。

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