Zircons from two samples of the Sukeng pluton in the southwest Fujian Province, China, were analyzed by LA-ICP-MS with the aim of determining the timing of formation. The zircons from the two samples yield similar U-Pb ages of 100.47 ± 0.42 and 102.46 ± 0.69 Ma, indicating that the Sufeng pluton is contemporaneous with the Sifang and Luoboling plutons, all of which are also related to Cu-Au-Pb-Zn-Mo mineralization within the study area. All three plutons have geochemical features of I-type granites, are high-to mid-K calc-alkaline metaluminous rocks, and have average molar Al 2 O 3 / (CaO+Na 2 O+K 2 O) values of 0.95, initial 87 Sr/ 86 Sr ratios of 0.70465-0.70841, Nd(t) values at 101 Ma from -1.72 to -7.26, and two-stage Nd model ages (T 2DM ) from 1.16 to 1.60 Ga.Zircons within these plutons have Hf(t) values at 101 Ma from -3.5 to 6.25 and T 2DM ages from 0.74 to 1.46 Ga, suggesting these I-type granites formed from magmas generated by partial melting of Mesoproterozoic to Neoproterozoic continental crust that mixed with mantle-derived magmas. The magmatism was associated with thickening of the lower crust caused by collisions between microcontinents in the Cathaysian Block, which were driven by Early Cretaceous subduction of the Pacific Plate.
Bonelike apatite formed on the surface of titanium pretreated with NaOH solution after having been immersed in simulated body fluid (SBF), while no apatite formed on the surface of untreated titanium.In the present study, electrochemical impedance spectroscopy (EIS) measurement was used to investigate the nucleation and growth of apatite on chemically treated titanium immersed in the SBF solution and the difference between the behaviors of treated and untreated titanium. Appropriate equivalent circuit models were constructed to describe the nucleation and growth of apatite and the thin oxide film formed on the surface of untreated titanium. It was found that EIS is a useful method for investigating the nucleation and growth of bonelike apatite on titanium pretreated with NaOH solution.
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