Barium Isotopes: Drivers, Dependencies, and Distributions through Space and Time
Barium Isotopes: Drivers, Dependencies, and Distributions through Space and Time
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钡同位素：空间和时间的驱动因素、依赖性和分布
DOI：
10.1017/9781108865845
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Crockford, Peter W
中科院分区：
文献类型：
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作者：
Horner, Tristan J;Crockford, Peter W
在现代海洋环境中，钡同位素（δ 138 Ba）的变化主要是由重晶石循环驱动的-重晶石从溶液中掺入“轻”Ba同位素，使残留Ba储层富集“重”Ba同位素，并补充量。由于重晶石沉淀和溶解过程是垂直分离和空间异质性，重晶石循环驱动海水和沉积物的钡同位素组成的系统变化。该元素检查这些变化;评估其全球，区域，局部和地质控制;并探索如何利用δ 138 Ba来限制神秘的沉积硫酸盐的起源，并研究地球历史上的海洋地球化学。
In the modern marine environment, barium isotope (δ138Ba) variations are primarily driven by barite cycling—barite incorporates' light'Ba isotopes from solution, rendering the residual Ba reservoir enriched in'heavy'Ba isotopes by a complementary amount. Since the processes of barite precipitation and dissolution are vertically segregated and spatially heterogeneous, barite cycling drives systematic variations in the barium isotope composition of seawater and sediments. This Element examines these variations; evaluates their global, regional, local, and geological controls; and, explores how δ138Ba can be exploited to constrain the origin of enigmatic sedimentary sulfates and to study marine biogeochemistry over Earth's history.