源于地壳的碳酸盐岩与源于地幔的碳酸盐岩

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Lithos Pub Date : 2024-10-01 DOI:10.1016/j.lithos.2024.107826
Ben-Xun Su , Shi-Ying Wang , Jing Wang , Hong-Rui Fan
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引用次数: 0

摘要

源自地幔的碳酸盐岩是一种重要的火成碳酸盐岩,存在于不同的构造环境中。它们通常与碱性岩石伴生,并可能含有各种矿化物。相比之下,地壳源碳酸盐岩是由地壳深处的石灰岩或大理岩直接熔化形成的。这些源于地壳的碳酸岩只出现在造山带,与变质硅酸盐岩和大理岩相伴,一般不会形成矿化物。这两种类型的碳酸盐岩在来源以及元素和同位素地球化学方面都有明显差异。它们可分为正碳酸盐岩(源于地幔)和副碳酸盐岩(源于地壳)。这两类碳酸盐岩的放射性 SrNd 同位素组成,以及副碳酸盐岩中额外的稳定 CO 同位素和放射性 Hf 同位素,都显示出与地质年代的相关性。这些时间上的变化可以为了解地球的演化历史提供有价值的信息。
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Crustal-derived versus mantle-derived carbonatites
Mantle-derived carbonatites are an important type of igneous carbonate rock found in diverse tectonic settings. They are commonly associated with alkaline rocks and can contain various mineralization. In contrast, crustal-derived carbonatites form from the direct melting of limestones or marbles at depths within the Earth's crust. These crustal-derived carbonatites are exclusively found in orogenic belts, alongside metamorphic silicate rocks and marbles, and generally do not develop mineralization. Both types of carbonatites exhibit distinct differences in their sources, as well as their elemental and isotopic geochemistry. They can be classified as ortho‑carbonatite (mantle-derived) and para‑carbonatite (crustal-derived). The radiogenic SrNd isotope compositions of both types of carbonatites, along with additional stable CO isotopes and radiogenic Hf isotopes in para‑carbonatites, show correlations with geological time. These temporal variations could provide valuable insights into the Earth's evolutionary history.
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来源期刊
Lithos
Lithos 地学-地球化学与地球物理
CiteScore
6.80
自引率
11.40%
发文量
286
审稿时长
3.5 months
期刊介绍: Lithos publishes original research papers on the petrology, geochemistry and petrogenesis of igneous and metamorphic rocks. Papers on mineralogy/mineral physics related to petrology and petrogenetic problems are also welcomed.
期刊最新文献
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