Abstract
At the outcrops of the Pariatambo Formation (middle west Albian) over the axis of the Cordillera and towards the eastern slopes of these in a well-defined belt that includes the departments of Junín and Lima y Pasco, numerous vanadiferous asphaltite occurrences are known. In such areas the Pariatambo Formation comprises a sequence of limestones, calcareous shales, and bituminous shales (from dark gray to red in color) with a predominance of the former. This sequence is intensively folded and faulted, with its structural axis predominantly oriented NW-SE. The asphaltite occurs interbedded with the shales and, on rare occasions, also with the limestones, forming the so-called veins which stretch out for 20 km or more. Such veins are really a succession of lenses, varying from 0.1 to 7 m wide, the maximum known length of a lens being approximately 150 m. The veins are not only confined to one bedding plane, but they also break through from one to another; some veins fill two or three contiguous bedding planes separated by single layers of shales 5 to 30 cm thick.
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© 1990 Springer-Verlag Berlin Heidelberg
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Cánepa, C. (1990). Vanadiferous Occurrences in the Pariatambo Formation and at Sincos, Central Peru. In: Fontboté, L., Amstutz, G.C., Cardozo, M., Cedillo, E., Frutos, J. (eds) Stratabound Ore Deposits in the Andes. Special Publication No. 8 of the Society for Geology Applied to Mineral Deposits, vol 8. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88282-1_46
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DOI: https://doi.org/10.1007/978-3-642-88282-1_46
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