Distribution of Trace Elements in Igneous Rocks of Peruvian Andes—Metallogenic Implications1
Etienne J. M. Audebaud, Jean Amosse, 1981. "Distribution of Trace Elements in Igneous Rocks of Peruvian Andes—Metallogenic Implications", Energy Resources of the Pacific Region, Michel T. Halbouty
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Although numerous papers have been written on the geologic and metallogenic features of the Andes, a satisfactory hypothesis in regard to distribution of mineralization has not been presented. Previous studies of sedimentary rocks, erosion, and structure have shown only that they had local influence. Geochemical studies of igneous rocks for 11 trace elements were plotted with respect to the distance of the rocks from the Peru-Chile trench. Analyses of the geochemical contents permitted the division of the Andean orogene into two main provinces. The western province is characterized by decreasing copper content and increasing nickel, cobalt, and nickel/cobalt ratio from west to east. The eastern province is defined by high contents of lithium, rubidium, lead, and zinc.
Three structural divisions were noted. On the west, the Precambrian shield was weakly deformed during the Hercynian orogeny. The Hercynian belt on the east has a highly folded series of sandstones and shales. Between these two zones, the Altiplano is a highly mobile joint between the two mechanically different domains.
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The energy and mineral resources of the vast Pacific basin and its neighboring land areas play a vital role in meeting the ever-growing needs of society worldwide. Building on the foundation of a highly successful conference held in 1978, this volume contains 51 of the 135 papers presented there. Subjects included are general and specific in nature--oil, gas, and coal resources; geothermal fields, uranium; tin; evaporites, trace elements; water resources; magma energy and fuels from magma. Geological and geophysical techniques, and also the new tool of remote sending for petroleum and minerals exploration are represented. Tectonics, structure fundamentals, subsurface hazards, international treaties and the law of the deep sea are discussed. Seventeen countries and regions are represented in these papers: Thailand, Nicaragua, the United States, Japan, Peru, Antarctica, El Salvador, Australia, Mexico, Taiwan, New Zealand, China, Chile, Indonesia, Canada, and the Pacific Ocean.