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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Experimental evidence that ooid size reflects a dynamic equilibrium between rapid precipitation and abrasion rates
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Experimental evidence that ooid size reflects a dynamic equilibrium between rapid precipitation and abrasion rates

机译：黄色尺寸的实验证据反映了快速降水和磨损率之间的动态均衡

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摘要

Ooids are enigmatic concentrically coated carbonate sand grains that reflect a fundamental mode of carbonate sedimentation and inorganic product of the carbon cycle-trends in their composition and size are thought to record changes in seawater chemistry over Earth history. Substantial debate persists concerning the roles of physical, chemical, and microbial processes in their growth, including whether carbonate precipitation on ooid surfaces is driven by seawater chemistry or microbial activity, and what role-if any-sediment transport and abrasion play. To test these ideas, we developed an approach to study ooids in the laboratory employing sediment transport stages and seawater chemistry similar to natural environments. Ooid abrasion and precipitation rates in the experiments were four orders of magnitude faster than radiocarbon net growth rates of natural ooids, implying that ooids approach a stable size representing a dynamic equilibrium between precipitation and abrasion. Results demonstrate that the physical environment is as important as seawater chemistry in controlling ooid growth and, more generally, that sediment transport plays a significant role in chemical sedimentary systems. (C) 2017 Elsevier B.V. All rights reserved.
机译：Ooids是神秘的同心涂覆的碳酸砂颗粒，其反映了它们组成和大小的碳酸碳沉降和无机产物的基本模式，以思考地球历史上的海水化学变化。关于物理，化学和微生物过程在其生长中的作用的实质性辩论，包括在海水化学或微生物活动中驱动碳酸盐盐沉淀，以及任何沉积物运输和磨损的作用。为了测试这些想法，我们开发了一种在使用沉积物运输阶段和海水化学类似于自然环境的实验室研究的方法。实验中的OOIZ磨损和降水速率比天然黄芩的净生长速率快四个数量级，这意味着OOIDS接近稳定的尺寸，表示沉淀和磨损之间的动态平衡。结果表明，物理环境在控制黄水化学方面是控制OOID生长的，更普遍地，沉积物运输在化学沉积系统中起着重要作用。 （c）2017年Elsevier B.V.保留所有权利。

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