Search Results - Magma (character)

Major and trace element characteristics of apatites in granitoids from central Kazakhstan: Implications for petrogenesis and mineralization by Cao, Mingjian, Li, G., Qin, K., Seitmuratova, E., Liu, Y.

“…Our results demonstrate that the concentrations and ratios of elements in apatites from different granitoid rocks show distinct features, and are sensitive to magma evolution, petrogenetic and metallogenetic processes. …”
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Generation of Early Indosinian enriched mantle-derived granitoid pluton in the Sanjiang Orogen (SW China) in response to closure of the Paleo-Tethys by Zi, Jianwei, Cawood, P., Fan, W., Tohver, E., Wang, Y., McCuaig, T.

“…Fractional crystallization operated during magma ascent and emplacement, and produced the wide spectrum of rock types seen in the pluton. …”
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Genesis of ilmenite-series I-type granitoids at the Baogutu reduced porphyry Cu deposit, western Junggar, NW-China by Cao, M., Qin, K., Li, G., Evans, Noreen, Hollings, P., Jin, L.

“…Limited variations in Sr-Nd-Pb-Hf-O isotopic compositions and extremely young whole rock T2DM (Nd) (430 to 570 Ma) and zircon TDM C (Hf) (310 to 640 Ma) do not indicate significant crustal contamination during magma ascent or emplacement. Rather the Baogutu ilmenite-series I-type granitoids were probably formed by mixing between mantle-derived mafic magma and juvenile lower crust-derived felsic magma. …”
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K1-congruences between L-values of elliptic curves by Ward, Thomas

“…We describe how the p-valuation of this ratio may be explicitly calculated, and use the computer package MAGMA to produce some numerical examples. We end by proving a formula for the growth of this quantity in terms of the Iwasawa invariants associated to the two-variable extension of the CM-field.…”
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Source and possible tectonic driver for Jurassic–Cretaceous gold deposits in the West Qinling Orogen, China by Wu, Y., Li, J., Evans, Katy, Fougerouse, Denis, Rempel, Kirsten

“…We therefore infer that the J3–K1 structural regime facilitated the ascent of magma in the EQO and metamorphic fluids in the WQO with consequent differences in the character of contemporaneous ore deposits. …”
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Late Permian appinite–granite complex from northwestern Liaoning, North China Craton: Petrogenesis and tectonic implications by Zhang, Xiaohui, Xue, F., Yuan, L., Ma, Y., Wilde, Simon

“…The associated monzogranites range in SiO2 from 72.6 to 75.0% and exhibit a high-K calc-alkaline character, with high Sr–Ba abundances and elevated Sr/Y and La/Yb ratios. …”
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Partial melting of thickened continental crust in central Tibet: Evidence from geochemistry and geochronology of Eocene adakitic rhyolites in the northern Qiangtang Terrane by Long, X., Wilde, Simon, Wang, Q., Yuan, C., Wang, Xuan-Ce, Li, J., Jiang, Z., Dan, W.

“…These adakitic rhyolites are high-K calc-alkaline in composition, displaying a weakly peraluminous character. They have low MgO content (0.20–0.70 wt.%) and Mg# values (24–39), as well as low Sc (2.25–2.76 ppm), Cr (8–14 ppm), Co (1.6–3.5 ppm) and Ni (2–3 ppm) concentrations. …”
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Xenoliths in ultrapotassic volcanic rocks in the Lhasa block: direct evidence for crust–mantle mixing and metamorphism in the deep crust by Wang, R., Collins, Bill, Weinberg, R., Li, J., Li, Q., He, W., Richards, J., Hou, Z., Zhou, L., Stern, R.

“…The oldest group is similar to common inherited zircons in the Gangdese belt, whereas the 50–45 Ma zircons match the crystallization age and juvenile character (eHfi +0.5 to +6.5) of Eocene Gangdese arc magmas. …”
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The Archean Fortescue large igneous province: A result of komatiite contamination by a distinct Eo-Paleoarchean crust by Mole, D., Barnes, S., Yao, Z., White, A., Maas, R., Kirkland, Chris

“…This study demonstrates that mafic magmas, with arc-like geochemical character and intermediate to felsic continental crustal compositions, can form via contamination of plume magmas by existing (local) crustal reservoirs, and the employment of modified lithospheric sources or enriched mantle is not required.…”
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Spatio-temporal geochemical evolution of the SE Australian upper mantle deciphered from the Sr, Nd and Pb isotope compositions of Cenozoic intraplate volcanic rocks by Oostingh, K., Jourdan, Fred, Merle, R., Chiaradia, M.

“…The magmas of the youngest (<500 ka) suite of the NVP (the Newer Cones) were generated by up to 13% partial melting of a garnet-rich source, followed by similar degrees of fractional crystallization. …”
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