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
复制标题
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
复制
发表时间:
2012
影响因子:
2.3
通讯作者:
Lehmann
中科院分区:
文献类型:
--
作者:
Cabral;Koglin;Seabra Gomes Jr;Lehmann
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.
登录
查看更多内容
影响因子:
2.8
作者:
W. Ghiorse;P. Hirsch
通讯作者:
P. Hirsch
DOI:
--
发表时间:
1994
期刊:
影响因子:
--
作者:
F. Chemale;C. Rosière;I. Endo
通讯作者:
I. Endo
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
A. Cabral;B. Lehmann;M. Tupinambá;S. Schlosser;R. Kwitko;Francisco Robério de Abreu
通讯作者:
Francisco Robério de Abreu
DOI:
--
发表时间:
1992
期刊:
影响因子:
--
作者:
F. Colin;G. Brimhall;D. Nahon;C. Lewis;A. Baronnet;Kathy J. Danti
通讯作者:
Kathy J. Danti
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
C. Rosière;H. Siemes;H. Quade;H. Brokmeier;Eleonore M. Jansen
通讯作者:
Eleonore M. Jansen