Microbial action formed Jurassic Mn-carbonate ore deposit in only a few hundred years (Urkut, Hungary)

被引：54

作者：

Polgari, Marta ^{[1
]}

Hein, J. R. ^{[2
]}

Toth, A. L. ^{[3
]}

Pal-Molnar, E. ^{[4
]}

Vigh, T. ^{[5
]}

Biro, L. ^{[4
]}

Fintor, K. ^{[4
]}

机构：

[1] Hungarian Acad Sci, Inst Geochem Res, H-1112 Budapest, Hungary

[2] US Geol Survey, Santa Cruz, CA 95060 USA

[3] HAS, Res Inst Tech Phys & Mat Sci, H-1121 Budapest, Hungary

[4] Univ Szeged, Dept Mineral Geochem & Petrol, H-6702 Szeged, Hungary

[5] Mangan Ltd, H-8409 Urkut, Hungary

来源：

GEOLOGY | 2012年 / 40卷 / 10期

基金：

匈牙利科学研究基金会;

关键词：

MATS; BACTERIAL;

D O I：

10.1130/G33304.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The Urktit (Hungary) manganese (Mn) ore, hosted by Jurassic black shale, was studied using high-resolution mineralogical, microtextural, and chemical methods. Two independent superimposed biostructures were identified consisting of rhythmic laminations that provide important proxies for paleoenvironments and duration of ore formation. Millimeter-scale laminae reflect a depositional series of Fe-rich biomats, mineralized microbially produced sedimentary structures. These biomats formed at the sediment-water interface under dysoxic and neutral pH conditions by enzymatic Fe2+ oxidizing processes that may have developed on a daily to weekly growth cycle. The early diagenetic sedimentary ore is composed of Ca rhodochrosite, celadonite, and smectite, and also shows a 100-mu m-scale element oscillation that produces Mn(Ca)-rich and Si(Fe clay)-rich microlaminae. This microlamination may reflect a 10 h to daily rhythmicity produced by the growth of microbial communities. If true, then the giant Urktit ore deposit may have formed over hundreds of years, rather than hundreds of thousands of years as previously thought.

引用

页码：903 / 906

页数：4

共 22 条

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