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[Unlocked] Ejm2073 45..61 Eur. J. Mineral. 2011, 23, 45–61 Published online November 2010 Mineralogy from three peralkaline granitic plutons of the Late Permian Emeishan large igneous province (SW China): evidence for contrasting magmatic conditions of A-type granitoids J. GREGORY SHELLNUTT* and YOSHIYUKI IIZUKA Institute of Earth Sciences, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 11529, Taiwan *Corresponding author, e-mail: [email protected] Abstract: The Emeishan large igneous province contains a diverse assemblage of igneous rocks including mildly peralkaline granitic rocks of A-type affinity. The granitic rocks from the Panzhihua, Baima and Taihe plutons are temporally, spatially and chemically associated with layered mafic-ultramafic intrusions. Electron microprobe analyses of the major and accessory minerals along with major and trace element data were used to document the magmatic conditions of the three peralkaline plutons. The amphiboles show magmatic/subsolidus trends and are primarily sodic-calcic in composition (i.e., ferrorichterite or richterite). Sodic (i.e., riebeckite-arfvedsonite) amphiboles are restricted to the Panzhihua and Taihe plutons. The amphiboles from the Panzhihua and Taihe granites are very similar in composition whereas amphiboles from the Baima syenites have higher MgO wt% and lower FeOt wt% and TiO2 wt%. Whole-rock Zr saturation temperature estimates indicate the initial average magma temperatures were 940 Æ 21 C for the Panzhihua pluton, 860 Æ 17 C for the Baima pluton, and 897 Æ 14 C for the Taihe pluton. The initial Fmelt(wt%) values were calculated to be 1.1 Æ 0.1, 0.8 Æ 0.1 and 1.1 Æ 0.1 wt% for the Panzhihua, Baima and Taihe plutons, respectively. The estimated Fmelt(wt%) values are higher than what can be accounted for in the Panzhihua and Taihe plutons and indicate that they may have lost F during crystallization. In contrast the Fmelt(wt%) value for the Baima pluton can be accounted for. The presence of titanite þ magnetite þ quartz in the Baima syenites indicates oxidizing fO2 conditions whereas the presence of aenigmatite and ilmenite in the Panzhihua and Taihe granites indicate that they were relatively reducing. Although the A- type granitoids formed by the same processes (i.e., fractional crystallization of mafic magmas), their differences in major element and mineral chemistry are likely related to a combination of initial bulk magma composition and magmatic oxidation state. Key-words: ferrorichterite, peralkaline, A-type granite, Zr saturation thermometry, oxygen fugacity, aenigmatite. 1. Introduction described sodic-calcic amphiboles from silica-saturated peralkaline granitic rocks as having magmatic/subsolidus The bulk composition of a magma is ultimately responsible or primary magmatic trends. The compositional trends for the composition of minerals which crystallize within it; reflect the substitution Aliv Ca $ Si (Na, K) and the however, magmatic conditions, such as temperature, progressive decrease in Mg# (¼ Mg2þ/[Mg2þ þ Fe2þ]) B F-content, oxygen fugacity (fO2) and water fugacity and Ca with an increase in Si. Sodic-calcic amphiboles (fH2O), can greatly influence their composition and type may have oxidation or late-stage reaction compositional (Mitchell, 1990; Scaillet & Macdonald, 2003, 2004, 2006a; trends as well (Strong & Taylor, 1984; Mitchell, 1990). Della Ventura et al., 2005; White et al., 2005). Within Peralkaline silica-saturated volcanic rocks are volumetri- peralkaline granitic rocks, the minerals and their composi- cally minor when compared to basalts within large igneous tion can be used to determine the likely magmatic condi- provinces but they have the potential to emit large amounts tions during their crystallization (Charles, 1975, 1977; of sulphur to the atmosphere, which may contribute to ocean Giret et al., 1980; Strong & Taylor, 1984; Wones, 1989; anoxia and mass extinctions (Scaillet & Macdonald, 2006b). Mitchell, 1990; Scaillet & Macdonald, 2001, 2004; Della The Late Permian (260 Ma) Emeishan large igneous pro- Ventura et al., 2005; White et al., 2005; Martin, 2007; vince of SW China contains numerous granitic rocks with A- Pe-Piper, 2007). For example, identifying the amphibole- type affinity (Shellnutt & Zhou, 2007; Zhong et al., 2007). type (i.e., sodic, sodic-calcic, calcic), as well as accessory The peralkaline A-type granitoids are temporally and spa- minerals amongst consanguineous peralkaline rocks, is tially associated with layered gabbroic intrusions and in helpful to determine if there is a common genetic process some cases fed sub-aerial volcanic eruptions (Shellnutt & or relationship between them (Mitchell, 1990; White et al., Jahn, 2010). Shellnutt et al. (2009a) have suggested that 2005). Strong & Taylor (1984) and Mitchell (1990) have these rocks were derived by fractional crystallization of a eschweizerbart_xxx 0935-1221/10/0022-2073 $ 7.65 DOI: 10.1127/0935-1221/2010/0022-2073 # 2010 E. Schweizerbart’sche Verlagsbuchhandlung, D-70176 Stuttgart 46 J.G. Shellnutt, Y. Iizuka common parental magma that produced both the granitic and K]; Frost et al., 2001; Panzhihua ¼ 0.86; Baima ¼ 0.83; cumulate gabbroic rocks. The Panzhihua and Taihe granitic Taihe ¼ 0.88), (Na þ K)/Al (Panzhihua ¼ 1.07; Baima ¼ plutons are compositionally similar, however the Baima 1.05; Taihe ¼ 1.12), Fe* (¼ FeOt/[FeOt þ MgO]) syenitic pluton is compositionally and mineralogically dif- (Panzhihua ¼ 0.97; Baima ¼ 0.85; Taihe ¼ 0.97) and ferent (Shellnutt & Zhou, 2007). Although the bulk-rock Eu/Eu* (Panzhihua ¼ 0.73; Baima ¼ 0.79; Taihe ¼ compositions and petrography of the granitoids rocks are 0.43). Their eNd(T) isotopic values also fall within the different, they have similar normalized trace-element pat- same range (eNd(T) ¼þ1.5 to þ 3.2). The remarkable terns, isotopic compositions and ages. It is thought that the aspect of the Panxi peralkaline plutonic rocks is their major-element differences between the Baima syenites and similar primitive mantle and chondrite normalized trace- the Panzhihua and Taihe granites may be due to initial bulk element patterns (Shellnutt & Zhou, 2007). The normal- magma compositions, temperature, F-content, magmatic ized trace-element plots show the trace-element composi- fO2 or any combination thereof. tions are similar regardless of the bulk rock composition Originally, mantle-derived peralkaline A-type grani- and imply that the rocks formed by the same process. toids were considered to form from reduced rather than oxidized magmas (Loiselle & Wones, 1979). The rocks within the Emeishan large igneous province offer an excel- lent opportunity to examine the mineralogy from three, 3. Petrography contemporaneous, mildly peralkaline, silica-saturated granitoids which are thought to originate by the same 3.1. Baima syenites process. The purpose of this study is to examine the mineral compositions of the peralkaline granitoids in The Baima syenites are coarse grained and consist of perthi- order to determine the likely magmatic conditions of tic alkali feldspar ( 70 vol%), amphibole ( 10 vol%), their host rocks. Along with new mineral chemistry data quartz ( 10 vol%), aegirine ( 5 vol%) and accessory we use previously published major and trace element data amounts ( 5 vol %) of apatite, titanite, zircon, plagioclase, to estimate the initial magma temperatures, magmatic fO fluorite, biotite, ilmenite, magnetite and pyrite (Fig. 3a–d) 2 and F (wt%) compositions. The alkali feldspar forms large ( 1.2 cm), subhedral to melt anhedral crystals with serrate boundaries which are occa- sionally separated from other perthitic crystals by an inter- granular mixture of alkali feldspar, quartz and accessory 2. Previous work plagioclase. The intergranular alkali feldspar and quartz are small (,0.3 cm) subhedral to anhedral, rounded crys- The Late Permian (260 Ma) Emeishan large igneous pro- tals. Euhedral to subhedral, rhombic ( 0.5 cm), sodic-calcic vince of southwest China hosts a diverse assemblage of amphibole (i.e., ferrorichterite or richterite) is the most volcanic and intrusive igneous rocks (Ali et al., 2005). abundant primary mafic mineral. The amphibole crystals Although the flood basalts are volumetrically (95%) the are pleochroic (light blue to light green) and commonly largest component, there is a significant amount of within- associated with subhedral aegirine. The amphibole is inter- plate granitic rocks (1%) (Fig. 1). Many of the granitic stitial to the alkali feldspar and quartz and is often associated rocks are consistent with the classification of ‘‘A-type’’ with agglomerates of euhedral apatite, zircon, titanite, ilme- and are of peraluminous, peralkaline and metaluminous nite, magnetite, fluorite and occasionally biotite. composition (Shellnutt & Zhou, 2007). Within the Panxi region (Panzhihua-Xi Chang) of the Emeishan large 3.2. Panzhihua granites igneous province, spatially and temporally associated with the peralkaline granitic rocks, are layered gabbroic The granites are coarse grained and consist primarily of intrusions which host world-class orthomagmatic Fe-Ti-V perthitic alkali feldspar, quartz and amphibole. Known oxide deposits (Zhou et al., 2005). The association accessory minerals include apatite, zircon, ilmenite, aenig- between the peralkaline granitic rocks and ore-bearing matite, Ce-monazite and titanite. The alkali feldspars are gabbroic rocks has led to suggestions that the gabbro- subhedral, rectangular to angular in shape and comprise granite complexes each formed by fractional crystalliza-
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