Late Proterozoic unconformity-related hydrothermal iron deposits in the northern Barker area (Tandilia ranges, Argentina)

Dristas JA; Martinez JC

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Late Proterozoic unconformity-related hydrothermal iron deposits in the northern Barker area (Tandilia ranges, Argentina)

机译：北部巴克地区（阿根廷坦迪利亚山脉）晚元古代与不整合面相关的热液铁矿床

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New outcrops of hydrothermal clay alterations, associated with the Late Proterozoic unconformity between the migmatitic basement and sedimentary quartzitic sandstone sequence, were found near small iron (goethite and hematite) deposits in the north Barker area (Tandilia, Argentina). Studied rocks from the contact, wall rock deposits and ores give evidence for hydrothermal activity. A characterization of the iron ore genesis, based on petrography, ore microscopy, X-ray diffractometry, fluid inclusion microthermometry, whole rock analyses (major, trace and rare earth elements), cathodoluminescence, and electron microprobe, is given. The iron source may be assigned to the destruction of mafic minerals of the migmatite basement. Aluminium-phosphate-sulphate minerals associated with both altered rocks at the contact, derived from the destruction of apatite and allanite of basement rocks by hydrothermal activity. Preliminary K-Ar dating of secondary well crystallized sericite from basement alteration indicate a Late Precambrian age for the hydrothermal event representing a widely distributed episode at the unconformity between the basement and sedimentary cover in the Tandilia ranges.

机译：在北部巴克地区（阿根廷坦迪利亚）的小铁（针铁矿和赤铁矿）矿床附近发现了新的热液黏土蚀变露头，这与晚古生代不整合面和沉积岩性石英砂岩序列之间的不整合有关。从接触中研究的岩石，围岩沉积物和矿石为热液活动提供了证据。基于岩石学，矿石显微镜，X射线衍射法，流体包裹体温度计，全岩石分析（主要，痕量和稀土元素），阴极发光和电子显微探针，对铁矿石的成因进行了表征。铁源可被分配用于破坏蒙脱石地下室的镁铁矿物质。磷酸铝硫酸盐矿物质与两种岩石接触时都发生了变化，这是由于水热活动破坏了磷灰石和基岩中的磷灰石而产生的。次生结晶的绢云母从基底变化的初步K-Ar测年表明，热液事件的前寒武纪年龄代表Tandilia范围内基底和沉积物覆盖之间的不整合面广泛分布。

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《Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen》 |2007年第3期|共15页
作者
Dristas JA; Martinez JC;
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正文语种 eng
中图分类地质学;
关键词
URANIUM DEPOSITS; AUSTRALIA; GOETHITE; FIELD;

机译：铀矿床;澳大利亚;哥特岩;实地;

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1. Late Proterozoic unconformity-related hydrothermal iron deposits in the northern Barker area (Tandilia ranges, Argentina) [J] . Dristas JA, Martinez JC Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen . 2007,第3期

机译：北部巴克地区（阿根廷坦迪利亚山脉）晚元古代与不整合面相关的热液铁矿床
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Late Proterozoic unconformity-related hydrothermal iron deposits in the northern Barker area (Tandilia ranges, Argentina)

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