Middle-Late Triassic metamorphism of the Guajira Arch-basement: Insights from zircon U–Pb and Lu–Hf systematics

The Geochemical and Isotopic Record of Wilson Cycles in Northwestern South America: From the Iapetus to the Caribbean

“…Within Venezuela, Permian intrusions are found in the El Baul Massif (294-283 Ma; [12]), and a diorite in the Paraguana Peninsula (272 ± 3 Ma; [2]). The intrusions are more numerous within Colombia and crop out in the Guajira Peninsula (272 ± 1.1 Ma; [59]), Sierra Nevada de Santa Marta (~288-264 Ma, El Encanto Orthogneiss and other mylonitised granites; [11,20]) and the central Cordillera Central where they are referred to as the Rovira Complex (~278-253 Ma, Colombia; [21,22,24]). In contrast, only a single Permian pluton has been found in Ecuador, which is located in the far southern Cordillera Real (~283 Ma; Malacatos Complex; [23,24]) close to the Peruvian border.…”

“…Triassic granodiorite and monzogranite leucosomes and variably foliated plutons are abundant in northwestern South America and they are described separate to the Permian intrusions because they are geochemically and isotopically distinct (see Section 4). Within Colombia they are found in the Cordillera Central (Cajamarca Complex), the basement of the Plato-San Jorge Basin, the Sierra Nevada de Santa Marta (La Secreta gabbro) and the Guajira Peninsula (e.g., Uray Gneiss; Figure 1), and yield zircon U-Pb concordia ages (Figures 2 and 3) ranging between 247.6 ± 4.1 Ma and 222 ± 10 [7,8,11,[20][21][22][23][24]26,[30][31][32]59]. The Tres Lagunas Granite, Moromoro Granite and leucosomes of the Sabanilla Migmatite within the Cordillera Real and Amotape Complex of Ecuador yield zircon U-Pb concordia dates that range between 249.9 ± 1.8 Ma and 207.6 ± 9.2 Ma [17,21,23,24,[34][35][36]60].…”