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格陵兰岛黑天使的古元古代密西西比河谷型矿化作用：来自硫化物δZn和铼-锇年代学的证据

Paleoproterozoic Mississippi Valley-type mineralization at Black Angel, Greenland: evidence from sulfide δZn and rhenium-osmium geochronology.

作者信息

Saintilan Nicolas J, Archer Corey, Szilas Kristoffer, Krüger Geertsen Kristina, Rosa Diogo, Spangenberg Jorge E

机构信息

Institute of Geochemistry and Petrology, Department of Earth and Planetary Sciences, ETH Zürich, Zürich, Switzerland.

Present Address: Department of Geological Sciences, University of Alabama, Box 870338, Tuscaloosa, AL 35487 USA.

出版信息

Miner Depos. 2025;60(5):1039-1057. doi: 10.1007/s00126-024-01332-w. Epub 2024 Dec 9.

DOI:10.1007/s00126-024-01332-w
PMID:40357316
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12065769/
Abstract

UNLABELLED

We provide timestamps for the major zinc-lead (Zn-Pb) Mississippi Valley-type Black Angel deposit (Greenland) based on new pyrite rhenium-osmium (Re-Os) isotope geochemistry data: (1) a Re-Os isochron age 1,884 ± 35 million years ago (Ma - 2σ, 1.8%) for subhedral pyrite cemented by sphalerite ± galena in dolomitized clean limestone, and, (2) a Re-Os model age 1,828 ± 16 Ma (2σ, 0.9%) for epigenetic massive pyrite in siltstone/mudstone cap rock. Zinc-lead mineralization in evaporite-bearing carbonates in the Karrat Basin took place ca. 1,884 Ma at the time of far-field fluid flow associated with back-arc spreading ca. 1,900-1,850 Ma. Mineralization predates the development of the Rinkian foreland basin (ca. 1,850 - < 1,800 Ma) and a collisional stage (ca. 1,830 - < 1,800 Ma) in the context of the telescoping Rinkian and the Nagssugtoqidian Orogens. Replacement of clean carbonate and sustained acid neutralization led to significant sphalerite precipitation ca. 1,884 Ma. Conversely, precipitation of epigenetic massive pyrite in the cap rock ca. 1,828 Ma may signal (1) the lack of chemical reactivity of the cap rock for the pH-buffered conditions needed for Zn-Pb mineralization, and (2) the unfavorable impact of incipient regional Rinkian metamorphism (ca. 1,830-1,800 Ma) and tectonic compression on aquifer permeability and continued brine migration. The initial Os/Os ratio (Os = 1.07 ± 0.32) from isochron regression identifies a crustal origin for Os and, by corollary, other metals in the ca. 1,884 Ma Zn-Pb mineralization. Although the Rae Craton basement rocks comprise the dominant source for metals (based on our Os and δZn data), we identify a complementary contribution in Zn (maximum 12-24%) from Paleoproterozoic sedimentary carbonate. This source of Zn in sedimentary calcite is deemed possible in the context of Paleoproterozoic seawater at high Na/Cl ratio and in the absence of Zn-based eukaryotic metabolism in shallow marine environment.

SUPPLEMENTARY INFORMATION

The online version contains supplementary material available at 10.1007/s00126-024-01332-w.

摘要

未标注

基于新的黄铁矿铼-锇（Re-Os）同位素地球化学数据，我们给出了格陵兰岛主要的锌-铅（Zn-Pb）密西西比河谷型黑天使矿床的时间戳：（1）在白云石化纯净石灰岩中，由闪锌矿±方铅矿胶结的半自形黄铁矿的Re-Os等时线年龄为18.84±0.35亿年前（Ma - 2σ，1.8%）；（2）在粉砂岩/泥岩盖层中后生块状黄铁矿的Re-Os模式年龄为18.28±0.16 Ma（2σ，0.9%）。卡拉特盆地含蒸发岩碳酸盐中的锌-铅矿化作用发生在约18.84 Ma，当时与约1900 - 1850 Ma的弧后扩张相关的远场流体流动。矿化作用早于林克期前陆盆地（约1850 - ＜1800 Ma）的发育以及林克期和纳格苏格托基迪造山带叠置背景下的碰撞阶段（约1830 - ＜1800 Ma）。纯净碳酸盐的交代作用和持续的酸碱中和导致约18.84 Ma时大量闪锌矿沉淀。相反，约18.28 Ma时盖层中后生块状黄铁矿的沉淀可能表明：（1）盖层对于锌-铅矿化所需的pH缓冲条件缺乏化学反应性；（2）林克期初期区域变质作用（约1830 - 1800 Ma）和构造压缩对含水层渗透性和卤水持续迁移产生了不利影响。等时线回归得到的初始Os/Os比值（Os = 1.07±0.32）确定了Os以及约18.84 Ma锌-铅矿化中其他金属的地壳来源。尽管雷克拉通基底岩石是金属的主要来源（基于我们的Os和δZn数据），但我们确定古元古代沉积碳酸盐对锌有补充贡献（最大12 - 24%）。在古元古代高Na/Cl比海水以及浅海环境中缺乏基于锌的真核生物代谢的背景下，沉积方解石中的这种锌来源被认为是可能的。

补充信息

在线版本包含可在10.1007/s00126-024-01332-w获取的补充材料。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/7566b1be59e7/126_2024_1332_Fig8_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/7566b1be59e7/126_2024_1332_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/1161f7f6155b/126_2024_1332_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/c17620813a4e/126_2024_1332_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/063d6395f534/126_2024_1332_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/b3595aeb07a5/126_2024_1332_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/9191891db8e0/126_2024_1332_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/fae560bfa0c2/126_2024_1332_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/0a6dfd4bece0/126_2024_1332_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c09/12065769/7566b1be59e7/126_2024_1332_Fig8_HTML.jpg

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