Bilateral geochemical asymmetry in the Karoo large igneous province

机译：卡鲁大火成岩省的双边地球化学不对称性

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In the Karoo large igneous province, the geochemical assessment of mantle source variability and structure is hampered by probable crustal contamination overprinting of compositionally diverse flood basalts. Mantle source characteristics have been defined only for exceptional, primitive rock types. Here I use a compiled dataset for over 800 samples to demonstrate that the abundance of Nb relative to Zr, Ti, and Y provides a useful geochemical tracer of mantle sources for variably contaminated rock types of the Karoo province. Variations in the relative abundance of Nb reveal emplacement of distinctive, Nb-undepleted and Nb-depleted magmas in the North Karoo and South Karoo sub-provinces, respectively, and clarify correlation between flood basalts and previously proposed mantle source components. Judging from plate tectonic reconstructions and the compositions of plausible mantle source components, the geochemical bilateral asymmetry in Karoo may reflect tapping of contrasting plume and upper mantle reservoirs in the two sub-provinces.

机译：在卡鲁大火成岩省，地幔源变异性和结构的地球化学评估受可能由组成多样的洪水玄武岩覆盖的地壳污染影响。地幔源特征仅针对特殊的原始岩石类型进行了定义。在这里，我使用了800多个样本的汇编数据集，以证明Nb相对于Zr，Ti和Y的丰度为Karoo省受各种污染的岩石类型提供了有用的地幔来源地球化学示踪剂。 Nb相对丰度的变化分别揭示了北Karoo和South Karoo子省独特，Nb未剥落和Nb贫化的岩浆的位置，并阐明了玄武岩与先前提出的地幔源组分之间的相关性。从板块构造重建和可能的地幔源成分组成来看，卡鲁的地球化学双边不对称性可能反映了两个亚省对比羽状和上地幔储层的分流。

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期刊名称 Scientific Reports
作者
Arto V. Luttinen;
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年(卷),期 -1(8),-1
年度 -1
页码 5223
总页数 11
原文格式 PDF
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1. Bilateral geochemical asymmetry in the Karoo large igneous province [J] . Arto V. Luttinen Scientific reports. . 2018,第1期

机译：在卡卢大火石化省的双侧地球化学不对称
2. The elusive feeders of the Karoo Large Igneous Province and their structural controls [J] . André Coetzee, Alexander F.M. Kisters Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth . 2018,第期

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3. Enrichment of O-18 in the mantle sources of the Antarctic portion of the Karoo large igneous province [J] . Heinonen Jussi S., Luttinen Arto V., Whitehouse Martin J. Contributions to Mineralogy and Petrology . 2018,第3期

机译：在卡罗大火省的南极部分的地幔来源中富集O-18
4. Petrological and Geochemical Studies of the Zhubu Magmatic PGE Deposit in the Permian Emeishan Large Igneous Province,SW China [C] . Q.-Y.Tang, C.Li, M.-J.Zhang, 12th international nickel symposium . 2012

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5. Platinum-group element geochemistry of large igneous provinces: Source characteristics, geochemical modeling, and the role of sulfide saturation. [D] . Chazey, William John, III. 2004

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7. Bilateral geochemical asymmetry in the Karoo large igneous province [O] . Arto V. Luttinen 2018

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8. Principal Oil and Gas Plays in the Appalachian Basin (Province 131) (Chapter I).Middle Eocene Intrusive Igneous Rocks of the Central Appalachian Valley and Ridge Province: Setting, Chemistry, and Implications for Crustal Structure (Chapter J) [R] . de Witt, W., Southworth, C. S., Gray, K. J., 1993

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Bilateral geochemical asymmetry in the Karoo large igneous province

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