geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Relationships between mineralization and silicic volcanism in the Central Andes


, : Relationships between mineralization and silicic volcanism in the Central Andes. Journal of Volcanology and Geothermal Research 18(1): 165-190

Studies of late Tertiary silicic volcanic centres in the Western and Eastern Cordilleras of the Central Andes show that three volcanic environments are appropriate sites for mineralization: (1) ring-fracture extrusions post-dating large calderas; (2) similar extrusions within ignimbrite shields; and (3) isolated, small silicic volcanoes. Subvolcanic tin mineralization in the Eastern Cordillera is located in silicic stocks and associated breccias of Miocene age. The Cerro Rico stock, Potosi, Bolivia, contains tin and silver mineralization and has an intrusion age apparently millions of years younger than that of the associated Kari Kari caldera. Similar age relationships between mineralization and caldera formation have been described from the San Juan province, Colorado. The vein deposits of Chocaya, southern Bolivia, were emplaced in the lower part of an ignimbrite shield, a type of volcanic edifice as yet unrecognized in comparable areas of silicic volcanism. The El Salvador porphyry copper deposit, Chile, is related to silicic stocks which may have been intruded along a caldera ring fracture. Cerro Bonete, Chile, provides a modern example of the volcanic superstructure which may have overlain isolated mineralized stocks and breccia pipes such as that of Salvadora at Llallagua, Bolivia.

US$19.90

DOI: 10.1016/0377-0273(83)90008-2


Other references

Fastner, J.; Erhard, M.; von Döhren, H., 2001: Determination of oligopeptide diversity within a natural population of Microcystis spp. (cyanobacteria) by typing single colonies by matrix-assisted laser desorption ionization-time of flight mass spectrometry. Besides the most prominent peptide toxin, microcystin, the cyanobacteria Microcystis spp. have been shown to produce a large variety of other bioactive oligopeptides. We investigated for the first time the oligopeptide diversity within a natural M...

Bartnik, W.; Bartnik, K., 1984: Reconstructive surgery in cranio-facial injuries. Otolaryngologia Polska 38(2): 153-163

Wolman, A., 1924: The Training For The Sanitarian Of Environment. American Journal of Public Health 14(6): 472-473

Borkar, M., R.; Mantri, U.U.; Avari, K.M.; Raut, P.D.; Bhiwgade, D.A., 2000: Cytoarchitecture of the adenohypophysial folliculostellate cell of the male flat headed bat, Tylonycteris pachypus (Temminck). The ultrastructure of the agranular folliculo-stellate cell from the adenohypophysis of the male flat headed bat Tylonycteris pachypus (Temminck) is described here. The cell is characterized by the presence of large, bizzare nucleus, a capacious e...

Reis, K.Schiavoni.Scandelai.Cardoso.dos.; Moreira, R.Oliveira.; Coutinho, W.Ferreira.; Vaisman, F.; Gaya, C., 2011: Anthropometric and metabolic evaluation of first-degree male relatives of women with polycystic ovary syndrome. To evaluate clinical and laboratory characteristics of first-degree male relatives of patients with a confirmed diagnosis of polycystic ovary syndrome (PCOS) and to compare the findings with a control group with no family history of PCOS. We rando...

Anonymous, 2013: Aegle marmelos protects hepatocytes from paracetamol induced hepatotoxicity. The present study was conducted to evaluate the hepatoprotective activity of hydroalcoholic extract of Aegle marmelos against paracetamol induced liver damage in rats. The methanolic extract of Aegle marmelos (500mg/kg) was administered orally to...

Ben-Sasson, S.A.; Cohen, T.; Voss, R., 1985: Background allelic variants in normal hemopoietic cells and Bloom's syndrome erythrocytes and the possible implication of somatic crossingover. The existence of rare cells with blood group A or B phenotype among the red cells of AB heterozygotes is a well-known phenomenon. However, its origin remains unclear due to methodological problems. A direct quantitation of non-B and non-A erythroc...

Huang, W.; Fisher, P.R.; Dulaimy, K.; Tudorica, L.A.; O'Hea, B.; Button, T.M., 2004: Detection of breast malignancy: diagnostic MR protocol for improved specificity. PURPOSE: To prospectively determine if a combined magnetic resonance (MR) protocol that includes T1-weighted dynamic contrast agent-enhanced (DCE) MR imaging, hydrogen 1 (1H) MR spectroscopy, and T2*-weighted per-fusion MR imaging improves specifi...

Iijima, K.; Morimoto, K.; Koizumi, A.; Higurashi, M.; Hirayama, M., 1984: Bleomycin-induced chromosomal aberrations and sister chromatid exchanges in Down lymphocyte cultures. Peripheral blood lymphocytes from three patients with Down syndrome (DS; trisomy 21; aged 5-6 years) and three age-matched control children were studied for the induction of chromosomal aberrations and sister chromatid exchanges (SCEs). Cells in G...

Boyle, R.A.; Williams, H.T.P.; Lenton, T.M., 2015: Natural selection for costly nutrient recycling in simulated microbial metacommunities. Recycling of essential nutrients occurs at scales from microbial communities to global biogeochemical cycles, often in association with ecological interactions in which two or more species utilise each others' metabolic by-products. However,...