2 research outputs found
Geochronological constraints on the evolution of the southern Dom Feliciano Belt (Uruguay)
<p>New U–Pb sensitive high-resolution ion microprobe, K–Ar and Ar–Ar data from the southernmost Dom Feliciano Belt allow the
identification of four major events. Orthogneisses from the Punta del Este Terrane indicate a magmatic episode at <em>c</em>. 770 Ma and high-grade metamorphism at 641 ± 17 Ma. Granitoid emplacement at 627 ± 23 Ma was roughly coeval with peak metamorphism.
Volcaniclastic rocks of the Las Ventanas Formation dated at 573 ± 11 Ma can be correlated with the peripheral foreland basin
(571 ± 8 Ma). Transpression and coeval high-K calc-alkaline magmatism is recorded in the Maldonado granite dated at 564 ±
7 Ma. The following events are postulated: (1) magmatism at 850–750 Ma related to rifting; (2) metamorphism and granite emplacement
at 650–600 Ma; (3) molasse sequences and foreland basins at <em>c</em>. 573 Ma; (4) late magmatism at 580–560 Ma associated with transpression. The data indicate that (1) the Punta del Este Terrane
could be a portion of the Coastal Terrane of the Kaoko Belt, (2) granitoid emplacement at 650–600 Ma in the Punta del Este
and Nico PĂ©rez terranes favours westward subduction, and (3) widespread post-collisional synkinematic magmatism occurred in
the Dom Feliciano and Kaoko belts between 580 and 550 Ma.
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MOESM1 of Trachyte weathering in the urban built environment related to air quality
Additional file 1. Trace-element chemical composition expressed as ppm of representative samples of Euganean trachyte from the Renaissance city walls of Padua determined by LA-ICPMS, on both surface (i.e., weathering crust or patina) and host rock (inner part). The samples are divided by different types of alteration and sampling location as in Fig. 2 (SCR, Bastione Santa Croce; GAR, Torrione dell’Arena; CSN, Bastione Castelnuovo; FST, Torrione Venier)