Characterization and Origin of Aluminous A-type Granites from the Lachlan Fold Belt, Southeastern Australia

Origin of the granulite enclaves in Indo-Sinian peraluminous granites, South China and its implication for crustal anatexis

“…13) compared with the typical granodiorite and its enclaves from the Lachlan Fold Belt in Australia (Collins, 1996;King et al, 1997;McCulloch and Chappell, 1982). These isotopic features are consistent Fig.…”

“…Using a Zr saturation Fig. 13.`8 7 Sr/ 86 Sr(i) vs. ε Nd (t) diagram of the granulite enclaves and the host granites in the DSGB and comparison with the LFB S-type and I-type granites (Collins, 1996;King et al, 1997;McCulloch and Chappell, 1982 Qi et al (2007), and Hsieh et al (2008). method of whole-rock geochemistry (Miller et al, 2003;Harrison, 1983, 2005), the temperature for the granites from the DSGB was calculated as 800-900°C.…”

An Early Permian (ca. 280Ma) silicic igneous province in the Alxa Block, NW China: A magmatic flare-up triggered by a mantle-plume?

“…Although many~280 Ma granitoids have been reported in the Alxa Block, no A-type granitoids have been identified in previous studies. In general, A-type granites are comparatively enriched in high field strength elements (HFSEs), such as Zr, Nb, Y, REE and Ga (e.g., Collins et al, 1982;Eby, 1992;King et al, 1997King et al, , 2001Sylvester, 1989;Whalen et al, 1987;Yang et al, 2006). In this study, a few granites in the Bayannuoergong batholith have the characteristics of A-type granites.…”

“…The origins of A-type granites have been attributed to: (1) direct fractionation of mantle-derived alkaline basalts (e.g., Mushkin et al, 2003;Turner and Rushmer, 2009;Turner et al, 1992); (2) partial melting of crustal materials at high temperature (e.g., Collins et al, 1982;King et al, 1997;Wang et al, 2010a) and (3) hybridization between anatectic crust-derived felsic and mantle-derived mafic magmas (e.g., Kerr and Fryer, 1993;Mingram et al, 2000;Yang et al, 2006). The absence of any mafic microgranular enclaves in the A-type pluton does not support the generation of these A-type granites by mixing of mantle-derived mafic magma and crustal-derived silicic melts.…”

Petrogenesis of the early Cretaceous Funiushan granites on the southern margin of the North China Craton: Implications for the Mesozoic geological evolution

“…They also have lower FeO T / MgO ratios (2.99-14.3, average 4.6) than that of A-type granites (FeO T /MgO > 10, Whalen et al, 1987). In addition, zircon saturation temperatures of the granitic magma is estimated to be 694°C and 830°C with an average value of 797°C (Watson and Harrison, 1983), lower than that of A-type granites (King et al, 1997(King et al, , 2001). Thus, rocks from the Funiushan pluton are classified as I-type series, rather than S-type or A-type granites (Chappell and White, 1992;Chappell, 1999).…”