Xenotime–hematite aggregates on opaline filaments: evidence for biomineralization in weathered siliciclastic rocks, Capanema, Quadrilátero Ferrífero of Minas Gerais, Brazil

Xenotime–hematite aggregates on opaline filaments: evidence for biomineralization in weathered siliciclastic rocks, Capanema, Quadrilátero Ferrífero of Minas Gerais, Brazil
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蛋白石丝上的磷钇铁矿聚集体:风化硅质碎屑岩生物矿化的证据,巴西米纳斯吉拉斯州卡帕内玛、夸德里拉特罗费雷费罗

DOI:
10.1007/s00531-011-0663-1
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发表时间:
2012
影响因子:
2.3
通讯作者:
Lehmann
Lehmann
中科院分区:
地球科学3区
文献类型:
--
作者:
Cabral;Koglin;Seabra Gomes Jr;Lehmann

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巴西米纳斯吉拉斯(Minas Gerais) Capanema (Quadrilátero Ferrífero) ~2.5 ga Moeda组风化石英岩的溶蚀孔洞被乳白色二氧化硅悬浮细丝装饰。细丝在开放空间中维持着铁-赤铁矿的聚集体。铁矾以包裹体的形式存在于赤铁矿的芽状和芽状聚集体中。丝状结构由股状芽、菌丝状延伸和组成席状排列的细链组成。它们类似于微生物细丝,被乳白色二氧化硅取代并变成化石。球形赤铁矿在无赤铁矿的蛋白石菌丝上的突起被解释为溶解的铁在细胞外聚合物上的增生。微生物细丝排出的聚合物物质中的磷酸盐位点可能将地下水中的钇和重稀土元素吸附到吸铁聚合物中。这可能导致赤铁矿矿体状聚集体与xenotime包裹体。风化带中自生xentime的存在,为利用xentime年代学约束红土剖面的演化提供了新的可能性。
Dissolution cavities in weathered pebbly quartzite of the ~2.5-Ga Moeda Formation at Capanema, Quadrilátero Ferrífero of Minas Gerais, Brazil, are decorated with suspended filaments of opaline silica. The filaments sustain xenotime–hematite aggregates in the open space. Xenotime occurs as inclusions in buds and botryoidal aggregates of hematite. The filamentous structures consist of strand-forming buds, hypha-like extensions, and thin strands that compose mat-like arrangements. They resemble microbial filaments that were replaced by opaline silica and fossilized. The occurrence of spherical hematite as protuberances on hematite-free opaline hyphae is interpreted as accretion of dissolved iron onto extracellular polymers. Phosphate sites in polymeric substances expelled from the microbial filaments might have adsorbed yttrium and heavy rare-earth elements from groundwater to the iron-accreting polymers. These would have resulted in botryoidal aggregates of hematite with xenotime inclusions. The presence of authigenic xenotime in the weathering zone opens a new possibility to constrain the evolution of lateritic profiles by xenotime geochronology.
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