60 research outputs found
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Letter to G.C. Amstutz from H.B. Stenzel on 1963-10-22
No full textJackson School of Geoscience
Recommended from our members
Letter to H.B. Stenzel from G.C. Amstutz on 1963-10-15
No full textJackson School of Geoscience
The Permo-Triassic Paleokarst ores of South-West Sardinia (Iglesiente-Sulcis): an attempt at a reconstruction of paleokarst conditions.
No full textIn memoriam: G. Christian Amstutz (November 27, 1922)
No full textProfessor Dr. Dr. h.c. mult G. Christian Amstutz, a key personality in the history of the Society for Geology Applied to Mineral Deposits (SGA), died on June 23, 2005 in his home in Sigriswill, Switzerland, at the age of 82. He had received numerous distinctions including several Doctor and Professor honoris causa awards. Christian Amstutz was a person with very broad interests , which extended beyond Metallogeny and Earth Sciences. These included Philosophy, Psychology, History, Literature, and Music. His external interests had a significant influence on his scientific outlook. One of his favorite topics, probably an outcome of the courses by G.C. Jung he attended in ZUrich, was to trace the "relationships between the general cultural trends and the evolution of thoughts in ore genesis". He liked to point out that consciously or subconsciously preconceived hypotheses had a strong influence on sc ientif ic theories and he considered the inte rpretations of some ore deposits as epigenetic as the result of cultural thought patterns. He claimed that scientists should critically take into account and filter the "thought archetypes" inherent in any cul ture, and try to construct clean working hypotheses which should be congruent with a combination of geometric (particularly cross-cutting relationships) and geochemical observations of ore and host rock at several observational scales, a statement with which most metallogenists would agree. G. Christian Amstutz's preoccupation with connections between the cultural and philosophical heritage of a scientist and the potential for interpretive bias did not prevent him to have exceptionally strong convictions on the genesis of ore deposits and rocks, convictions that now we may believe were not always congruent with the observational bas is. We would like to end this obituary with the quotation he used in the opening article of the first volume of Mineralium Deposita, a quote that best summarizes the main message he delivered to his numerous students: "For the purpose of research is not to imagine that one possesses the theory which alone is right, but, doubting all theories, to approach gradually nearer to truth. (C.G.Jung, l959, Basic Writings, Modern Library, p. 379)
KICIK, ENDİŞEGÜNEY VE SEYFE (GAZİPAŞA/ANTALYA-TÜRKİYE) YÖRESİNDEKİ TABAKAYA BAĞLI BARİT-GALEN ZUHURLARI
No full textGazipaşa (Antalya) yöresinde Kıcık, Endişegüney ve Seyfe mıntıkasında bulunan tabakaya bağlı barit - galen zuhurlarının yankayaç ilişkileri ve kökenlerim açıklama denemesi, bu çalışmanın konusunu oluşturmaktadır. Cevher minerallerinin yankayaç ile olan ilişkileri, yani barit ve galen seviyelerinin büyük ölçüde ve sabit şekilde tabakaya bağlılığı ve sintektonik olan tarihçeleri, başlangıçta epijenetik olan bir oluşumun geçersizliğini ortaya koyduğundan, geriye bir sinsedimenter oluşum imkânı kalmaktadır. Rejyonal metamorfizma ve tektonik olaylar sırasında oluşan kristalizasyon değişiklikleri şüphesiz epijenetik etkilerdir. Ancak burada savunulan görüş için, önemli olan barit ve galenin yankayacın deformasyonuna tamamen katılması ve dolayısıyle aynı oluşum yaşında olmaları gerektiği olgusudur
The formation of auriferous quartz-sulfide veins in the Pataz-Region, Northern Peru: A synthesis of geological, mineralogical and geochemical data
No full textThe Pataz region in the eastern part of the North Peruvian Department La Libertad hosts a number of important gold mining districts like La Lima, El Tingo, Pataz, Parcoy, and Buldibuyo. Economic gold mineralization occurs in quartz-sulfide veins at the margin of the calc-alkaline Pataz Batholith, that mainly consists of granites, granodiorites, and monzodiorites. The batholith is of Paleozoic age and cuts the Precambrian to Early Paleozoic low-grade metamorphic basement series. Its intrusion was controlled by a NNW-trending fault of regional importance. The gold-bearing veins are characterized by a two-stage sulfide mineralization. Bodies of massive pyrite and some arsenopyrite were formed in stage 1, and after subsequent fracturing they served as sites for deposition of gold, electrum, galena, sphalerite, and chalcopyrite. It is concluded that gold was transported as a AuCl 2 - -complex by oxidizing chloride solutions and deposited near older pyrite by micro-scale redox changes and a slight temperature decrease. Mineralogical, textural, geochemical, and microthermometric features are interpreted as a consequence of mineralization at considerable depth produced by a hydrothermal system linked with the emplacement of the Pataz Batholith. acteristics in order to outline a general physicochemical model of the hydrothermal ore-forming processes
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