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Mineralogy, chemistry and fluid inclusions in the nitrata ore deposits of Maria Elena, II Region, Chile. | |
Collao, S; Arce, E; Andia, A | |
通讯作者 | Collao, S |
来源期刊 | BOLETIN DE LA SOCIEDAD CHILENA DE QUIMICA
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ISSN | 0366-1644 |
出版年 | 2002 |
卷号 | 47期号:2页码:181-190 |
英文摘要 | The deposit of Maria Elena in the Atacama Desert, is at present the only important nitrate ore deposit mined in Chile. The mineralogy, chemistry and fluid inclusions of this mineralization are described in this paper. Nitrate ores occur as stratiform seams below the desert surface and are hosted mainly by breccias and sandstones which include volcaniclastic and tuff facies. Salt minerals cement these clasts or form bands at the mm-m scale. The ore is largely composed of nitratite and halite. Nitrate contents vary between 7.5 to more than 20 wt % and NaCl between 8.6 to 40 wt %. Locally abundant are the sulphates thenardite, anhydrite, bloedite, polyhalite, hexahidrite and glauberite, which reflect part of 7.5 to 19.7 wt % of Na2SO4. Other salts present in minor contents include a varity of sulphates (kieserite, woodwardite, loeweite); nitrates (humberstonite, darapskite and niter); borates (kaliborite, stroncioborite); chlorides (sylvite, nantokite) and iodates (bruggenite). The IO3 vary between 0.026 to 0.074 wt %. Preliminary fluid inclusions studies show that the homogenization temperature in liquid rich type inclusions in thenardite from the banded ores in these deposits vary between 216degrees to 239 degreesC. The salinity of the fluid phase varies between 4.4 to 10.6 wt % of Na Cl equivalent. This suggests the existence of thermal processes during salt formation. Therefore evaporation may have not been the only mechanism of importance during the genesis of these salt deposits. |
英文关键词 | nitrates mineralogy Maria Elena Atacama Desert Chile |
类型 | Article |
语种 | 西班牙语 |
国家 | Chile |
收录类别 | SCI-E |
WOS记录号 | WOS:000176814300015 |
WOS类目 | Chemistry, Multidisciplinary |
WOS研究方向 | Chemistry |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/142223 |
作者单位 | (1)Fac Ciencias Quim, Dept Ciencias Tierra, Concepcion, Chile;(2)Soc Quim & Minera Chile, Antofagasta, Chile |
推荐引用方式 GB/T 7714 | Collao, S,Arce, E,Andia, A. Mineralogy, chemistry and fluid inclusions in the nitrata ore deposits of Maria Elena, II Region, Chile.[J],2002,47(2):181-190. |
APA | Collao, S,Arce, E,&Andia, A.(2002).Mineralogy, chemistry and fluid inclusions in the nitrata ore deposits of Maria Elena, II Region, Chile..BOLETIN DE LA SOCIEDAD CHILENA DE QUIMICA,47(2),181-190. |
MLA | Collao, S,et al."Mineralogy, chemistry and fluid inclusions in the nitrata ore deposits of Maria Elena, II Region, Chile.".BOLETIN DE LA SOCIEDAD CHILENA DE QUIMICA 47.2(2002):181-190. |
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