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- W4207055928 abstract "We explore the temporal evolution of pre-Andean Cordilleran arcs in central and northwestern Argentina and northern Chile (27°–34°S) with a focus on the geochemical characteristics of the episodic magmatism and the relationship with crustal thickness. A compilation of ca. 5000 U-Pb bedrock and detrital zircon ages, with ages from 600 to 130 Ma, reveals seven temporal magmatic accretions with main peaks at ∼526 Ma (Pampean); ∼471 Ma (Famatinian); ∼340 and ∼305 Ma (Early Gondwanan); ∼253 and ∼221 Ma (Gondwanan); and ∼160 Ma (Early Andean). We show that most of the magmatic episodes were developed in 30–50 km thick crust. Magmatism experienced fractional crystallization (r = 0) combined with variable degrees of assimilation (r > 0) that mostly did not exceed 30% crust. We conclude that increasing crustal thickness not only promotes more extensive differentiation by fractionation but also establishes conditions near host rock solidi at shallow crustal levels promoting further contamination in magmas." @default.
- W4207055928 created "2022-01-26" @default.
- W4207055928 creator A5025912806 @default.
- W4207055928 creator A5034501463 @default.
- W4207055928 creator A5050530602 @default.
- W4207055928 creator A5081276956 @default.
- W4207055928 date "2022-06-01" @default.
- W4207055928 modified "2023-10-17" @default.
- W4207055928 title "The role of crustal thickness on magma composition in arcs: An example from the pre-Andean, South American Cordillera" @default.
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