Minerals cave, Irazú volcano, Costa Rica: description, mineralogy and origin
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| المؤلفون: | , , |
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| التنسيق: | artículo original |
| الحالة: | Versión publicada |
| تاريخ النشر: | 2025 |
| الوصف: | Two caves located on the NW sector of the main crater of Irazú volcano are described for the first time. The caves, called Mucolitos and Minerales, are located at the base of the landslide t on December 8th, 1994, and are found in pyroclastic rocks with intense hydrothermal alteration. We suggest that both caves are associated with spaces between blocks in block slide with stepped surface and this mechanism is proposed as new vulcanospeleological me- chanism. We collected twenty samples which were analyzed based on x-ray diffractometry studies and their physical properties. Twenty one differents minerals corresponding to twenty sulfates and one native element were identified. Five of these minerals are reported for the first time in worldwide caves (aplowite CoSO4•4H2O, boyleite (Zn, Mg) SO4∙4H2O, ferrinatrite Na3Fe(SO4)3•3H2O, magnesiocopiapite MgFe+34 (SO4)6(OH)2•20H2O and wupatkiitea (Co,Mg, Ni)Al2(SO4)4•22H2O). The cave presents different speleothemes, the crust is the most common one, but also stalactites, stalagmites and geysermites are present. In both caves, the presence of snottites formations (extremophile bacteria colonies) was identified. We propose four principals mineralogenic mechanisms for the formation of these minerals, which correspond to degassing, solubilization alteration and dehydratation. The influence of biogenic activity in the precipitation of some minerals is also suggested. |
| البلد: | Portal de Revistas UCR |
| المؤسسة: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| اللغة: | Español |
| OAI Identifier: | oai:archivo.portal.ucr.ac.cr:article/12242 |
| الوصول للمادة أونلاين: | https://archivo.revistas.ucr.ac.cr/index.php/geologica/article/view/12242 |
| كلمة مفتاحية: | irazú volcano costa rica volcanic caves mineralogy sulfates vulcanospeleology snottite volcán irazú cuevas volcánicas mineralogía sulfatos vulcanoespeleología mucolitos |