Mantle driven cretaceous flare-ups in Cordilleran arcs
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2019Metadata
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Martínez Ardila, Ana María
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Mantle driven cretaceous flare-ups in Cordilleran arcs
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© 2018 The AuthorsContinental arcs display episodic magmatism characterized by flare-ups and lulls. Models published to explain these patterns invoke (1) upper plate crustal processes driven by internal feedback; (2) episodic mantle melting processes, or (3) external lower plate tectonic events. This study addresses the role of mantle magmas during flare-ups in Mesozoic Cretaceous continental arcs using geochronological and geochemical data for three Cretaceous arc segments: the western Peninsular Ranges Batholith (wPRB), the Peruvian Coastal Batholith (PCB), and the Chilean Coastal Batholith (CCB). In all three arc segments, bedrock zircon age patterns defining a flare-up from ~125 to 90 Ma characterized by gabbro to granite units with Sri < 0.705, ƐNd from 0 to +7.5, 208Pb/204Pb from 38.2 to 38.7, and 206Pb/204Pb from 18.3 to 18.7. These values project well towards a depleted mantle source. Areal measurements show that gabbro forms ~18% (wPRB), ~24% (PCB), and ~10% (CCB) of exposed p
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URI: https://repositorio.uchile.cl/handle/2250/171411
DOI: 10.1016/j.lithos.2018.12.007
ISSN: 18726143
00244937
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Lithos, Volumen 326-327,
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