ALBERT

Beschreibung: 〈span〉Convergent plate boundaries are the primary location for the formation of continental crust by the intrusion of arc batholiths that contain essentially mantle-derived magmas. This paper presents two types of arc granitoids (enclave-free monzogranites and enclave-bearing granodiorites) in northeastern (NE) China to understand crustal evolution and growth in the eastern Asian continental margin. The monzogranites (189 Ma) show characteristics typical of upper continental crust, with high SiO〈sub〉2〈/sub〉 contents and enrichment of K, Rb, and Pb. These monzogranites have low 〈span〉I〈/span〉〈sub〉Sr〈/sub〉 (〈sup〉87〈/sup〉Sr/〈sup〉86〈/sup〉Sr) ratios (0.70378–0.70413) and positive ε〈sub〉Nd〈/sub〉 (t) (+2.2 to +2.3) and ε〈sub〉Hf〈/sub〉 (t) (+7.3 to +10.2) values. These features, combined with high zircon saturation temperatures (〈span〉T〈/span〉〈sub〉Zr〈/sub〉 〉 800 °C), suggest that the monzogranites were generated by the heat-fluxed melting of juvenile lower crust. In contrast, the granodiorites (171 Ma) contain abundant coeval mafic enclaves and show relatively low silica contents, low 〈span〉T〈/span〉〈sub〉Zr〈/sub〉 (748–799 °C), and particularly wide variation in ε〈sub〉Hf〈/sub〉 (t) (-3.5 to +5.6), implying a hybrid origin involving both mantle- and crust-derived components. Isotopic modeling indicates that mantle material accounts for around 60%–70% of the hybrid magmas by volume. The granodiorites have adakite-like signatures (e.g., Sr/Y 〉 21 and [La/Yb]〈sub〉N〈/sub〉 〉 15), which may have been primarily caused by a process of magma mixing and hornblende-dominated fractional fractionation, rather than through melting of a subducting slab or thickened lower crust. The two distinct granitoids (monzogranites and granodiorites) represent continental crustal reworking and growth, respectively, related to the subduction of the Paleo-Pacific Plate beneath the eastern Asian continental margin during the Jurassic.〈/span〉

Beschreibung: 〈span〉〈div〉Abstract〈/div〉Convergent plate boundaries are the primary location for the formation of continental crust by the intrusion of arc batholiths that contain essentially mantle-derived magmas. This paper presents two types of arc granitoids (enclave-free monzogranites and enclave-bearing granodiorites) in northeastern (NE) China to understand crustal evolution and growth in the eastern Asian continental margin. The monzogranites (189 Ma) show characteristics typical of upper continental crust, with high SiO〈sub〉2〈/sub〉 contents and enrichment of K, Rb, and Pb. These monzogranites have low 〈span〉I〈/span〉〈sub〉Sr〈/sub〉 (〈sup〉87〈/sup〉Sr/〈sup〉86〈/sup〉Sr) ratios (0.70378–0.70413) and positive ε〈sub〉Nd〈/sub〉 (t) (+2.2 to +2.3) and ε〈sub〉Hf〈/sub〉 (t) (+7.3 to +10.2) values. These features, combined with high zircon saturation temperatures (〈span〉T〈/span〉〈sub〉Zr〈/sub〉 〉 800 °C), suggest that the monzogranites were generated by the heat-fluxed melting of juvenile lower crust. In contrast, the granodiorites (171 Ma) contain abundant coeval mafic enclaves and show relatively low silica contents, low 〈span〉T〈/span〉〈sub〉Zr〈/sub〉 (748–799 °C), and particularly wide variation in ε〈sub〉Hf〈/sub〉 (t) (−3.5 to +5.6), implying a hybrid origin involving both mantle- and crust-derived components. Isotopic modeling indicates that mantle material accounts for around 60%–70% of the hybrid magmas by volume. The granodiorites have adakite-like signatures (e.g., Sr/Y 〉 21 and [La/Yb]〈sub〉N〈/sub〉 〉 15), which may have been primarily caused by a process of magma mixing and hornblende-dominated fractional fractionation, rather than through melting of a subducting slab or thickened lower crust. The two distinct granitoids (monzogranites and granodiorites) represent continental crustal reworking and growth, respectively, related to the subduction of the Paleo-Pacific Plate beneath the eastern Asian continental margin during the Jurassic.〈/span〉

Beschreibung: The magnetic field configuration of the previously proposed knot undulator [Qiaoet al.(2009).Rev. Sci. Instrum.80, 085108] is realised in the design of a hybridized elliptically polarized undulator, which is presented. Although the details of the field distribution are not the same as those in the theoretical proposal, it is demonstrated that the practical knot undulator could work perfectly. In order to understand the minor discrepancies of the two, mathematical formulae of the synchrotron radiation are derived based on the Fourier transform of the magnetic field. From the results of calculations by simulation program, the discrepancies could be well interpreted by the corresponding formulae. The results show the importance of optimization of the end sections of the knot undulator to suppress the on-axis heat load. Furthermore, a study of the impact of the undulator on beam dynamics of the storage ring was conducted using the Shanghai Synchrotron Radiation Facility as an example and the results show that the knot undulator has little effect on the beam.

Beschreibung: The vacuum ultraviolet beamline BL03U with a photon energy range from 7 eV upwards has been constructed at the 3.5 GeV Shanghai Synchrotron Radiation Facility. Equipped with an APPLE-Knot undulator, this beamline is dedicated to angle-resolved photoemission spectroscopy. An energy-resolving power of higher than 4.6 × 104 has been achieved in the photon energy range 21.6–48 eV, which is almost the same as the theoretical estimation.

Beschreibung: A portable spin- and angle-resolving photoelectron spectrometer has been constructed, equipped with a newly developed compact retarding-potential Mott-scattering electron spin polarimeter with an efficiency of 1.9 × 10−4 for a gold target. Based on Monte Carlo calculations for the spin-dependent electron-scattering process and electron ray-tracing calculations, a novel design of the retarding-field electron optics with 0.59 sr collection solid angle for scattered electrons has been accomplished. Utilizing this spectrometer, the spin- and angle-resolved photoelectron spectra have been measured and the spin-dependent electronic structure of Ni(110), Ni(110)-p(2 × 1)O and Ni(110)-c(2 × 2)S along the {overline {Gamma S}} line of the Ni(110) surface Brillouin zone have been studied.