Oxygen and neodymium isotope evidence for source diversity in Cretaceous anorogenic granites from Namibia and implications for A-type granite genesis

Zircon REE patterns and geochemical characteristics of Paleoproterozoic anatectic granite in the northern Tarim Craton, NW China: Implications for the reconstruction of the Columbia supercontinent

“…Thus, in geochemical discrimination diagrams (Fig. 11), the Xinger samples plot in the field of typical plume-or hotspot-related A-type granites (Hildreth et al, 1991;Frost et al, 1999;Trumbull et al, 2004;Haapala et al, 2007;Xu et al, 2008). Although the geochemical characteristics of the Xinger granite are similar to those of A-type granite, according to the original definition, the hydrous mineral assemblage and the absence of arfvedsonite and aegirine clearly indicate that this granite is not A-type (Fig.…”

Asymmetry of high-velocity lower crust on the South Atlantic rifted margins and implications for the interplay of magmatism and tectonics in continental breakup

“…The Paraná volcanic units cover at least 1.2 × 10 6 km 2 (Peate et al, 1992). The equivalent units on the African margin cover 0.08 × 10 6 km 2 (Erlank, 1984), to which we may add an equivalent area covered by basaltic feeder dikes where lavas are eroded (Trumbull et al, 2004(Trumbull et al, , 2007. Taking maximum thickness values for the Paraná-Etendeka sequences into account (1.7 km in Brazil vs. 0.9 km in Namibia from Peate et al, 1992) yields volumes of 1.4 × 10 6 km 3 and 0.14 × 10 6 km 3 for South America and Africa, respectively, which are likely to be minimum estimates given the advanced state of erosion.…”

Implications from zircon-saturation temperatures and lithological assemblages for Early Permian thermal anomaly in northwest China

“…2), which is ascribed to the result of crust-mantle plume interaction (Etendeka: Ewart et al, 1998;Frindt et al, 2004;Harris et al, 1999;Mingram et al, 2000;Schmitt et al, 2000;Trumbull et al, 2004;Emeishan LIP: Zhong et al, 2007Shellnutt et al, 2011;Shellnutt and Jahn, 2010;Xu et al, 2010). Etendeka granitoids have zircon saturation temperatures ranging from 803°C to 926°C with an average significantly greater than 800°C (Fig.…”

“…2). The high ε Nd (t) values and young T DM ages may be indicative of growth of juvenile crust by plume-related magmatism (Mingram et al, 2000;Schmitt et al, 2000;Trumbull et al, 2004;Xu et al, 2008;Zhong et al, 2011). In addition to the ubiquitous involvement of juvenile crust in the genesis of granitoids in LIPs, the participation of ancient crust in magma genesis is also evident as attested by lower ε Nd (t) values associated in the Etendeka and Emeishan provinces (Bryan, 2007;and references therein).…”