Professional Background

Dr. Lledo participated as an inorganic geochemist in Expedition 309 of the Integrated Ocean Drilling Program (IODP), which in conjunction with Expeditions 206 and 312 succesfully drilled (for the first time in the history of the drilling program) a complete section of the oceanic crust.

His Ph.D. degree at Binghamton University (SUNY), was under Dr. H. Richard Naslund's and Dr. David Jenkins' advise. His research topic was a study of the origin of Chilean iron deposits, and involved field mapping, sample petrography, whole-rock and mineral analysis and experimental studies on the effects of phosphorous and volatiles (H2O, S, F, Cl, and B) in producing magma immiscibility in andesitic rocks and experimental work on the thermal-stability of actinolite.

For his Master's thesis his research topic involved the study of the origin of magmatic Fe and hydrothermal Fe-Cu-Au deposits in the Chilean Andes. After completing his master’s degree he worked for the Geological Survey of Chile and gained experience in a broad range of ore deposits and igneous rocks.

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Research

Doctor Lledo's current research examines the origin of the Mid-Miocene gold mineralization of the Searchlight mining district, and its relationship with the Searchlight Pluton (Nevada). The Searchlight Pluton and the overlying volcanic rocks are tilted to the west in almost 90 degrees which constitute a rare opportunity to study the Pluton in depth and its relationship with the gold mineralization. The study involves mapping, petrography, geochemistry, fluid inclusions studies, and geochronology.

His interests also include experimental research, specifically related to the effects of phosphorous and other volatiles in magmas; experimental studies on the thermal stability of actinolite and its changes in geochemical composition at different conditions; and the chemical variations of the oceanic crust.

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Selected Publications

Journal Articles

Lledo, H., Jenkins, D., 2007. Experimental investigation of the Upper-thermal stability of Mg-rich actinolite, implications for Kiruna type iron deposits. Journal of Petrology (In review, August 2007).

Wilson, D., Teagle, D., Alt, J., Banerjee, N., Umino, S., Miyahita, S., Acton, G., Anma, R., Barr, S., Belghoul, A., Carlut, J., Christie, D., Coggon, R., Cooper, K., Cordier, C., Crispini, L., Durand, S., Einaudi, F., Galli, L., Gao, Y., Geldmacher, J., Gilbert, L., Hayman, N., Herrero-Bervera, E., Hirano, N., Holter, S., Ingle, S., Jiang, S., Kalberkamp, U., Kerneklian, M., Koepke, J., Laverne, C., Lledo, H., Maclennan, J., Morgan, S., Neo, N., Nichols, H., Park, S., Reichow, M., Sakuyama, T., Sano, T., Sandwell, R., Scheibner, B., Smith-Duque, C., Swift, S., Tartarotti, P., Tikku, A., Tominaga, M., Veloso, E., Yamasaki, T., Yamasaki, S., Ziegler, C., 2006. Drilling to gabbro in intact ocean crust. Science 312, no. 5776, pp. 1016-1020.

Henriquez, F., Naslund, H.R., Nystrom, J., Vivallo, W., Aguirre, R., Dobbs, M., Lledo, H., 2003. New field evidence bearing on the origin of the El Laco magnetite deposit, northern Chile; Discussion. Economic geology 98, no. 7, pp. 1497-1500.

Naslund, H.R., Lledo, H., Henriquez, F., 2003. Age of Mineralization of the Candelaria Fe Oxide Cu-Au deposit and the Origin of the Chilean Iron Belt, based on Re-Os Isotopes-A Discussion. Economic Geology 98, pp. 1047-1052.

GSA ABSTRACTS

Lledo H., Cline, J., 2007. The Searchlight mining district, Nevada: Linking low sulfidation epithermal mineralization with an underlying granitic pluton. GSA abstracts with programs October 2007.

Lledo, H., Jenkins, D., 2004. Actinolite in Kiruna-type iron deposits I: Upper-thermal stability of Mg-rich actinolite. GSA abstracts with programs 35. Paper 88-6.

Lledo, H., Jenkins, D., 2004. Actinolite in Kiruna-type iron deposits II: Stability in the presence of P-Fe-magma. GSA abstracts with programs 35. Paper 88-7

Lledo, H., 2003. Experimental study of the effects of phosphorous and volatiles in producing magma immiscibility in an andesitic magma. GSA abstracts with programs 34. Paper 72-1.

Naslund, H.R., Henriquez, F., Nystrom, J.O., Aguirre, R., Lledo, H., 2003. El Laco, Chile: Evidence for the eruption of an immiscible Fe-O-S-P melt. GSA abstracts with programs 34. Paper 161-4.

PROFFESIONAL REPORTS AND ABSTRACTS

Lledo, H.L., Cline, J.S., 2007. The Searchlight Mining District: Linking low sulfidation epithermal mineralization with an underlying granitic pluton using fluid inclusions. ECROFI-XIX, University of Bern, Switzerland. Abstract Volume pp. 116.

Naslund, H.R., Aguirre, R., Lledo, H., 2004. Evidence for the formation of massive magnetite ores by liquid immiscibility. IAVCEI meeting abstracts, in press.

Diaz, A., Espinoza, C., Lledó, H., Vivallo, W., 2000. Yacimientos metalíferos de la Hoja La Guardia, región de Atacama, Escala 1:100.000. Servicio Nacional de Geología y Minería, Santiago. Mapa de Recursos Minerales de Chile. n.5. 20 p.

Diaz, A., Lledó, H., Espejo, C., Fonseca, E., 2000. Presencia de celestina en depósitos vetiformes Paleógenos, de la precordillera de Copiapó, III región, Chile. In Actas IX Congreso Geológico Chileno, Puerto Varas, Chile. Vol. I pp.198 -200.

Vivallo, W., Diaz, A., Gelcich, S., Lledó, H., 2000. Estilos y Tipos de mineralización del Jurasico y Cretácico Inferior en la Cordillera de la Costa de la Región de Copiapó, Chile. In Actas IX Congreso Geológico Chileno, Puerto Varas, Chile. Vol. II pp. 179 -182.

Díaz, A., Lledó, H., Gelcich, S., Espinoza, C., Portigliatti, C., Vivallo, W., Vögel, S., Carrasco, R., 1999. Atlas de Yacimientos Metalíferos de la III Región de Atacama entre los 26 y 28º S. Servicio Nacional de Geología y Minería; Informe Registrado IR 99-18, 18 maps scale 1:150.000. 21 p. Santiago, Chile.

Lledó, H., 1998. Metalogénesis de los cuadrángulos Copiapó, Cerro Chamonate y Nantoco, III Región de Chile. Memoria título y tesis para optar al título de geólogo y grado de magíster, Universidad de Chile, 204 p.

Díaz, A., Lledó, H., Vivallo, W., 1998. Yacimientos Metalíferos de la Hoja Los Loros. Servicio Nacional de Geología y Minería, Santiago. Mapa de Recursos Minerales de Chile, N°2, 28 p., 1 map escale 1: 100.000.

Lledó, H., 1997. Hallazgo de ooides de calcopirita en la mina Providencia, Implicancias Metalogénicas, Copiapó, III Región. In Actas VIII Congreso Geológico Chileno, Antofagasta, Chile. Vol. II, pp.1043 -1047.

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Students

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