Mixed Caledonian appinite magmas: implications for lamprophyre fractionation and high Ba-Sr granite genesis

Late Neoarchean potassic high Ba–Sr granites in the Taishan granite–greenstone terrane: Petrogenesis and implications for continental crustal evolution

“…For example, Tarney and Jones (1994) proposed that they were probably derived by (1) the partial melting of subducted ocean islands or ocean plateaus, (2) the partial melting of underplated mafic rocks, or (3) the partial melting of veined lithospheric mantle that had been metasomatized by asthenosphere-derived carbonatitic melts; in addition, some authors interpreted them as the products of partial fusion of the mafic lower crust (e.g., Ye et al, 2008;Choi et al, 2009), whereas other workers invoked an origin of enriched subcontinental lithospheric mantle to account for their genesis (e.g., Fowler and Henney, 1996;Fowler et al, 2001;Qian et al, 2003;Fowler et al, 2008). Alternatively, taking into account their similar geochemical signatures to sanukitoids and TTGs, such as high Ba-Sr contents, Sr/Y and (La/Yb) cn ratios and strongly fractionated REE patterns, and close space-time distribution with the latter, the petrogenesis of high Ba-Sr granites may be related to these rocks or their fractionation products (Smithies et al, 2004;Fowler et al, 2008).…”

“…(a) Sr-Rb-Ba plot (after Tarney and Jones, 1994), and (b) Rb-Ba-Sr plot (after El Bouseily and El Sokkary, 1975) for the late Neoarchean high Ba-Sr granites in the TSGT. Fields of high Ba-Sr and low Ba-Sr granitoids are based on data from Fowler and Henney (1996) and Fowler et al (2001). Fields of adakite are based on data from Defant et al (1991a,b), Sajona et al (1993Sajona et al ( , 1994, Morris (1995), Stern and Kilian (1996) and Yogodzinski et al (1994Yogodzinski et al ( , 1995.…”

“…These events may follow a period of subduction. Indeed, a subduction-related arc setting has previously been suggested to account for the genesis of high Ba-Sr granite (e.g., Tarney and Jones, 1994;Fowler and Henney, 1996;Fowler et al, 2001Fowler et al, , 2008. The presence of contemporaneous slab melts (adakitic rocks, Peng et al, 2012) and sub-arc enriched mantle-derived sanukitoid magma and SHMBs with a boninite affinity (Wang et al, 2009;Peng et al, 2013), coupled with coeval high-Mg adakitic rocks representing the products of interaction between slabderived melts and overlying peridotite mantle (Peng et al, 2012), is a strong argument in favor of active subduction at this time in the TSGT.…”

Chemical, isotopic, and temporal variations during crustal differentiation : insights from the Dariv Igneous Complex, Western Mongolia

“…Nevertheless, the origin of this monzonitic series has only been investigated in the field to a limited extent. Several field studies on high-K granitoids have suggested that biotite-and clinopyroxene-dominated fractionation from high-K primitive melts is capable of producing these derivative granitic liquids (Fowler and Henney 1996;Fowler et al 2001;Lobach-Zhuchenko et al 2008). However, these studies lack exposure of high-K ultramafic and mafic cumulates in significant enough quantities to substantiate the volumes required by their fractionation models.…”

40 Ar/ 39 Ar phlogopite geochronology of lamprophyre dykes in Cornwall, UK: new age constraints on Early Permian post-collisional magmatism in the Rhenohercynian Zone, SW England

“…Scarrow et al 2011;Atherton & Ghani 2002;Fowler & Henney 1996). A mantle component in the Cornubian Batholith has been inferred based on mafic enclave compositions (e.g.…”