Geochemistry of Compositionally Distinct Late Cretaceous Back-Arc Basin Lavas: Implications for the Tectonomagmatic Evolution of the Caribbean Plate

Abstract

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Petrology and geochemistry of the Karaj Dam basement sill: Implications for geodynamic evolution of the Alborz magmatic belt

“…Ba is preferentially added to an island arc magma source region in the slab-flux component, so Pearce and Stern (2006) proposed that magma that originated in an island arc setting would have a higher Ba/Yb than a N-MORB. Additionally, since the source region of back-arc basin basalts (BABB) is fluxed with volumetrically fewer slab-derived components than arc-like source regions, magmas from BABB environments have intermediate Ba/Yb values that lie between N-MORB and island arc compositions (Hastie et al, 2010;Pearce and Stern, 2006). Samples from the KDBS in this study, as well as other rocks from the AMB (Asiabanha and Foden, 2012), equivalent rocks from adjacent regions believed to have been formed in a back-arc setting (Vincent et al, 2005;Aghazadeh et al, 2010;Dabiri et al, 2011;Sarjoughian et al, 2012), along with representative data from the UDMA (Omrani et al, 2008) and the southern part of the Eastern Pontide arc of Turkey (Eyuboglu et al, 2011) are plotted on Ba/Yb-Nb/Yb (Pearce and Stern, 2006;Fig.…”

Protolith provenance and thermotectonic history of metamorphic rocks in eastern Jamaica: Evolution of a transform plate boundary

“…Detailed whole-rock geochemical studies by Hastie et al (2010) suggest a back-arc basin tectonic setting for these rocks.…”

“…90 Ma. This oceanic plateau was subsequently tectonically emplaced through a combination of strike-slip faulting and subduction into its present position between the North American and South American plates (e.g., Burke, 1988;Kerr et al, 1999;Pindell et al, 2005;Hastie et al, 2010). While thick sequences of Tertiary carbonate rock conceal much of the early record of Caribbean plate kinematics, transpression along strike-slip fault zones (Mann et al, 1985(Mann et al, , 2007 has selectively uplifted and exposed Cretaceous igneous and metamorphic rocks which offer windows into the early history of the Caribbean plate.…”

“…90 Ma back-arc volcanic tectonic setting (Hastie et al, 2010). In addition to these volcanic rocks, two suites of metamorphic rock of presumed Cretaceous age (Draper 1979(Draper , 1986) are exposed in the Blue Mountains-the Westphalia Schist and Mt.…”

Evolution of the Caribbean plate and origin of the Gulf of Mexico in light of plate motions accommodated by strike-slip faulting

“…16), the mid-to late Campanian (ca. 75 Ma) Bellevue lavas form two distinct groups-a basaltic and basaltic andesite subgroup and an andesitic to dacitic subgroup (Hastie et al, 2010b). The Bellevue lavas, considered to be arc-related, show moderate enrichment in LREE and slightly negative Ce anomalies on chondrite-normalized diagrams; furthermore, on N-MORB-normalized diagrams, Th displays only moderate enrichment, and Nb and Ta are only slightly depleted.…”