U-Pb age data from the Sunsas region of Eastern Bolivia, evidence for the allochthonous origin of the Paragua Block
Ion microprobe U-Pb dating of detrital zircons from the Chiquitania and San Ignacio groups of Eastern Bolivia show that these rocks were derived mostly from a 1765 Ma source and were deposited after 1690 Ma. The emplacement of the Lomas Maneches granitoid suit, dated at 1690-1660 Ma, accompanied the deposition of these metasediments. These rocks, which collectively define the basement of Eastern Bolivia, were subsequently deformed and metamorphosed during two discrete periods of orogenesis. The...[Show more]
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