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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Rare earth elements in dolostones and limestones from the Mesoproterozoic Gaoyuzhuang Formation, North China: Implications for penecontemporaneous dolomitization
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Rare earth elements in dolostones and limestones from the Mesoproterozoic Gaoyuzhuang Formation, North China: Implications for penecontemporaneous dolomitization

机译：稀土元素在北部塞托罗古代高庄庄组中的稀土元素和石灰岩中的稀土元素：珠光术语的影响

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摘要

The Mesoproterozoic Gaoyuzhuang Formation (1.54-1.6 Ga), which is up to 1543 m thick, is a dolostone-dominated succession that originated in the Yanshan-liaoxi rift zone. In ascending order, this formation comprises Members 1 to 4. Member 1 is formed of clastic rocks and dolostones, whereas Members 2 and 4 are formed largely of dolostones. Member 3, which is divided in ascending order into three units (Members 3-L, 3-M, 3-T), is a succession of intercalated limestone and dolostone that have total rare earth elements (SREE) ranging from 0.5 to 116 ppm and variable Post-Archean Australian Shale (PAAS) normalized profiles. Carbonates from Member 3-M have REE profiles characterized by positive La and Y anomalies, a negative Ce anomaly, and a weak positive Eu anomaly. Relative to Member 3-M, carbonates from Member 2 and Member 3-L have flat REE profiles characterized by enriched light REEs, negative La and Ce anomalies, a positive Eu anomaly, and a lower Y/Ho ratio. Carbonates from Member 3-T and Member 4, relative to those from Member 3-M, are slightly more depleted in light REEs, lack a La anomaly, are enriched in Eu, have less depletion in Ce, and have similar Y/Ho ratios. Correlations between the dolomite content of samples and their [Pr/Sm]PAAS, [La/La*]PAAS, [Ce/Ce*]PAAS, and [Gd/Gd*] PAAS ratios indicate that dolomite-forming processes were probably associated with REE fractionation that reflects mixing between seawater and freshwater. Therefore, the REEs in Mesoproterozoic dolostones have the potential of being used as proxies for constraining the diagenetic environment under which the dolomites formed.
机译：MesproteroZoica高井庄形成（1.54-1.6 GA），厚度为1543米，是一种源于燕山 - 辽稀土区的多脊酮主导的继任。按升序，该形成包括构件1至4.构件1由碎屑岩和天使骨酮形成，而构件2和4在很大程度上形成Dolostones。成员3以升序分为三个单位（成员3-L，3-L，3-T），是插层的石灰石和褥风，其具有总稀土元素（Sree）的范围为0.5至116ppm和可变的第型澳大利亚页岩（PAAS）标准化配置文件。来自成员3-M的碳酸盐具有REE型材，其特征是阳性La和Y异常，阴性Ce异常和弱正面欧盟异常。相对于构件3-M，来自构件2和构件3-L的碳酸盐具有扁平的REE型材，其特征是富含光圈，阴性La和Ce异常，阳性欧盟异常和较低的Y / HO比。来自构件3-T和构件4的碳酸盐相对于来自成员3-m的构件4，在轻质芦页中略微耗尽，缺乏La异常，在欧盟中富集，在Ce中缺乏，并且具有类似的Y / HO比率。样品的白云石含量与其[PR / SM] Paas，[La / La *] Paas，[Ce / Ce *] PaaS和[Gd / Gd *] PaaS比率之间的相关性表明白云石形成过程可能是相关的用REE分级反映海水和淡水之间的混合。因此，中蛋白沸石骨酮中的簧片具有用作限制形成白云岩的成岩环境的代理。

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