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Geochemical evidence for a multi-source origin of manganese in the Montaña de Manganeso deposit, central Mexico
Geochemistry ( IF 3.7 ) Pub Date : 2021-06-11 , DOI: 10.1016/j.chemer.2021.125789
Joseph Madondo , Carles Canet , Eduardo González-Partida , Fernando Núñez-Useche , Augusto A. Rodríguez-Díaz , Abdorrahman Rajabi , Vanessa Colás , Lauren Blignaut , Nicholas Andrew Vafeas

The Montaña de Manganeso is a manganese vein-type deposit spatially associated with back-arc basin remnants of the Guerrero tectonostratigraphic terrane. The study of major- and trace-element geochemical characteristics of the deposit provides insight into the controls on ore-forming processes within the area. The deposit is characterized by low Co, Cu and Ni abundances, and high Ba (>10,000 ppm) contents and Mn/Fe ratios (<500), typical of hydrothermal Mn deposits. In addition, the low ∑REE abundances (18.7 to 103 ppm), negative Ce anomalies (0.2 to 0.6), and positive Y (1.00 to 2.34) and Eu anomalies (0.6 to 4.4) also suggest a hydrothermal source for the deposit. Discrimination plots involving ∑REE and Zr vs. (Cu + Ni + Co) and Ce/Ce* vs. Nd and Y/Ho further indicate a hydrothermal source in an oxidizing depositional environment. The Mn-Fe-(Ni + Cu + Co), MnO2-MgO-Fe2O3, (Cu/Zn)/Fe2O3 vs. (Zn/Ni)/MnO2 and Na/Mg diagrams display intermediate signatures between marine and terrestrial environments. This suggest that the Montaña de Manganeso deposit is the result of two metallogenic stages: (I) the earliest stage, which involved the formation of Mn oxides by hydrothermal/diagenetic processes in the Arperos back-arc basin during the Cretaceous; and (II) the latest stage took place subsequent to accretion the Guerrero tectonostratigraphic terrane onto the continent and involved the remobilization of the Cretaceous submarine Mn oxides (and associated trace elements) and subsequent redepositation by Tertiary continental hydrothermal activity.



中文翻译:

墨西哥中部 Montaña de Manganeso 矿床多源锰的地球化学证据

Montaña de Manganeso 是一个锰脉型矿床,在空间上与格雷罗构造地层的弧后盆地残余物有关。对该矿床的主要和微量元素地球化学特征的研究提供了对该地区成矿过程的控制的深入了解。该矿床的特点是 Co、Cu 和 Ni 丰度低,Ba(>10,000 ppm)含量和 Mn/Fe 比(<500)高,这是热液锰矿床的典型特征。此外,低 ∑REE 丰度(18.7 至 103 ppm)、负 Ce 异常(0.2 至 0.6)和正 Y(1.00 至 2.34)和 Eu 异常(0.6 至 4.4)也表明该矿床有热液来源。涉及 ∑REE 和 Zr 与 (Cu + Ni + Co) 和 Ce/Ce* 与 Nd 和 Y/Ho 的判别图进一步表明氧化沉积环境中的热液源。2 -MgO-Fe 2 O 3、(Cu/Zn)/Fe 2 O 3与(Zn/Ni)/MnO 2和Na/Mg 图显示了海洋和陆地环境之间的中间特征。这表明 Montaña de Manganeso 矿床是两个成矿阶段的结果:(I) 最早阶段,涉及白垩纪 Arperos 弧后盆地的热液/成岩过程形成 Mn 氧化物;(II) 最新阶段发生在格雷罗构造地层向大陆增生之后,包括白垩纪海底锰氧化物(和相关微量元素)的再迁移和第三纪大陆热液活动的再沉积。

更新日期:2021-06-11
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