Ore deposits introductory courseSlides to Chapter N
Ore deposits in maetamorphic rocks and orogenic gold deposits
Nevado Huaguruncho (5723 m) in the Cordillera Oriental of Peru.
Photo taken from the gold district of Huach贸n during the 2005 field trip
of the SEG student chapters of the AV短视频 and the ETH Z眉rich
Photograph 漏: R. Moritz (1.10.2005)
Click on the picture for an enlarged version of this photograph
Photomicrographs of gold and base metal sulfide textural relationships in the Pataz orogenic ores, Peru. Abbreviations: as = arsenopyrite, Au = native gold, el = electrum, gn = galena, py = pyrite, qz = quartz, sl = sphalerite. A. Sphalerite veinlet with chalcopyrite, galena, and electrum crosscutting arsenopyrite and pyrite of stage I (Mercedes vein). B. Galena and gold filling cracks in strongly fractured pyrite I (La Lima 2 vein). C. Galena crystal with coeval inclusions of gold grains and small crystals of second-stage arsenopyrite (Mercedes vein). D. Gold in the cracks of an isolated idiomorphic arsenopyrite I in a sulfide-poor lode (Pencas piso vein). -- Click on the picture for an enlarged version of this photograph.
More on the Pataz orogenic gold belt:
Haeberlin, Y., Moritz, R., Fontbot茅, L. & Cosca, M.. Economic Geology. In press. v. 99, p. 73-112 (pdf abstract)
More on gold in the Cordillera Oriental, Peru:
Yves Haeberlin, Robert Moritz, Llu谋虂s Fontbot茅,
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Ore Geology Reviews Volume 22, Issues 1鈥�2, January 2003, Pages 41鈥�59
More on the geology and geochronology of the Cordillera Oriental, Peru:
Miskovic A., Schaltegger U., Spikings R., Kosler J. & Chew D.M. (2009) Tectono-magmatic evolution of Western Amazonia: geochemical characterization and zircon U-Pb geochronologic constraints from the Peruvian Eastern Cordillera granitoids. Geol. Soc. Am. Bull. 121, 1298-1324.
