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- W2074457686 abstract "The volcanic rocks investigated in a cross-section between the Pacific and Atlantic coasts of Nicaragua — with the exception of Recent and some Pleistocene lavas — are incipiently to strongly altered. Alteration patterns on different scales can be discerned in the Tertiary sequences: (i) a regional burial diagenesis or very low-grade burial metamorphism at the low-temperature end of the zeolite facies (mordenite subfacies) with an inferred thermal gradient of < 50°C/km, grading into (ii) a geothermal field type of alteration in mining districts (laumontite subfacies with local transition to wairakite subfacies at depth); the thermal gradient probably exceeded 100°C/km. There are also (iii) local alteration aureoles around gold-bearing quartz veins. The regional alteration assemblages include minerals that, under favorable conditions, might have formed deposits of great potential use as non-metallic raw materials (zeolites and bentonite). Mineralogical differences between the alteration outside and within mining districts might be used as an exploration guide. Todas las rocas volcánicas muestreadas en un perfil entre las costas pacífica y atlántica de Nicaragua — a excepción de las recientes y algunas del Pleistoceno — están incipientemente a fuertemente alteradas. En las secuencias terciarias, se pueden distinguir diversos patrones de alteración a diferente escala: (i) un metamorfismo regional de enterramiento de bajo grado o diagénesis de enterramiento correspondiente a la subfacies de más baja temperatura de la facies de ceolita (mordenita) con un paleogradiente térmico menor de 50°C/km, que grada hacia los distritos mineros a (ii) una alteración de tipo campo geotérmico correspondiente a la subfacies de laumontita que en profundidad, pasa localmente a una transición con la subfacies de wairakita; el gradiente térmico probablement fué mayor que 100°C/km. También se presentan (iii) aureolas de alteración local alrededor de vetas de cuarzo auríferas. Las asociaciones mineralógicas de alteración regional incluyen minerales que bajo condiciones favorables pueden haber formado depósitos de materias primas no metálicas de gran uso potencial (ceolitas y bentonita). Las diferencias mineralógicas entre la alteración fuera y dentro de los distritos mineros pueden usarse como guías de exploración." @default.
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- W2074457686 date "1989-01-01" @default.
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- W2074457686 title "Alteration patterns in volcanic rocks within an east-west traverse through central Nicaragua" @default.
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