Oxygen isotope homogeneity assessment for apatite U‐Th‐Pb geochronology reference materials

Yang, Qing; Xia, Xiaoping; Le, Zhang; Zhang, Wanfeng; Zhang, Yanqiang; Chen, Linli; Yang, Ya‐Nan; He, Miaohong

doi:10.1002/sia.6717

Cited by 15 publications

(9 citation statements)

References 56 publications

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“…While the CO 2 content of MT apatite is similar to other published CO 2 concentrations of carbonatitic apatite (Binder and Troll;1989;Santos and Clayton 1995), the H 2 O content of MT apatite is significantly higher (by a factor 4) than in "typical" carbonatite apatite (Binder and Troll 1989). By assuming that the MT apatite retained its original geochemical fingerprint, a hypothesis supported by the mantlelike oxygen isotope signatures and the absence of alteration zones (Yang et al 2020), we speculate that the Mud Tank carbonatite did not exsolve significant amounts of hydrous fluids, at least at the currently-exposed stratigraphic level. This would also explain the lack of significant alteration of the gneissic host rocks in agreement with earlier interpretations by Crohn and Moore (1984).…”

Section: Examplessupporting

confidence: 72%

Measuring in situ CO2 and H2O in apatite via ATR-FTIR

Hammerli

Hermann

Tollan

et al. 2021

Contrib Mineral Petrol

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We present a new approach to determine in situ CO2 and H2O concentrations in apatite via attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). Absolute carbon and hydrogen measurements by nuclear reaction analysis (NRA) and elastic recoil detection (ERD) are used to calibrate ATR-FTIR spectra of CO2 and H2O in apatite. We show that CO2 and H2O contents in apatite can be determined via linear equations (r2 > 0.99) using the integrated area of CO2 and H2O IR absorption bands. The main benefits of this new approach are that ATR-FTIR analyses are non-destructive and can be conducted on polished sample material surfaces with a spatial resolution of ~ 35 μm. Furthermore, the wavenumber of the phosphate IR absorption band can be used to determine the crystallographic orientation of apatite, which allows for accurate quantification of CO2 and H2O in randomly orientated apatite grains. The limit of quantification of H2O in apatite is ~ 400 ppm and ~ 100 ppm for CO2. Via two examples, one from a carbonatite and one from a metasedimentary rock, we show that this new technique opens up new possibilities for determining volatile concentrations and behavior in a wide range of hydrothermal, igneous, and metamorphic systems.

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Section: Examplessupporting

confidence: 72%

Measuring in situ CO2 and H2O in apatite via ATR-FTIR

Hammerli

Hermann

Tollan

et al. 2021

Contrib Mineral Petrol

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“…Over the past years, the AdS/CFT correspondence(or its generalized version, the gauge/gravity a e-mail: lujunwang.2008@163.com b e-mail: ybwu61@163.com duality) has been intensively applied in many aspects in condensed systems [3][4][5][6][7][8][9], especially the high T c superconductor (s-wave), which was realized successfully via an Einstein-Maxwell theory coupled to a complex scalar field in the Schwarzschild-AdS black hole in the probe limit [10,11]. After that, the holographic superconductor model was extended to the SU (2) p-wave superconductor model [12], d-wave superconductor model [13], the insulator/superconductor model [14], the competition and coexistence of two order parameters [15][16][17][18], Sturm-Liouville (S-L) method [19][20][21], the backreaction from the matter field to the gravitational background [22], the effects of external magnetic field [23,24] as well as the lattice effects [25][26][27][28][29], see, for example, Refs. [30][31][32] for reviews.…”

Section: Introductionmentioning

confidence: 99%

Holographic p-wave superconductor with $$C^2F^2$$ correction

Dong

2020

Eur. Phys. J. C

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Via numerical and analytical method, we construct the holographic p-wave conductor/superconductor model with C 2 F 2 correction (where C 2 F 2 = C αβ μν C μν αβ F ρσ F ρσ , and C αβ μν and F ρσ denotes the Weyl tensor and gauge field strength, respectively.)in the four-dimensional Schwarzschild-AdS black hole, and mainly study the effects of C 2 F 2 correction parameter denoted by γ on the properties of superconductors. The results show that for all values of the C 2 F 2 parameter, there always exists a critical temperature below which the vector hair appears. Meanwhile, the critical temperature increases with the improving C 2 F 2 parameter γ , which suggests that the improving C 2 F 2 parameter enhances the superconductor phase transition. Furthermore, at the critical temperature, the real part of conductivity reproduces respectively a Drude-like peak and an obviously pronounced peak for some value of nonvanishing C 2 F 2 parameter. At the low temperature, a clear energy gap can be observed at the intermediate frequency and the ratio of the energy gap to the critical temperature decreases with the increasing C 2 F 2 parameter, which is consistent with the effect of the C 2 F 2 parameter on the critical temperature. In addition, the analytical results agree well with the numerical results, which means that the analytical Sturm-Liouville method is still reliable in the grand canonical ensemble.

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“…One of the main developing direction is naturally to construct the superconductor model much closer to the real superconductor in the condensed physics. For example, superconductor models were extended to the SU(2) Yang-Mills p-wave model [13], the d-wave model [14,15], the superfluid model [16,17], the coexistence and competition of multiple orders as well as the intertwined order [5,[18][19][20][21][22][23], the lattice [24][25][26] and their corresponding insulator/superconductor phase transition model [27]. In particular, considering that the phase transitions in many condensed matter systems exhibit the anisotropic scaling of spacetime, the authors in Refs.…”

Section: Introductionmentioning

confidence: 99%

Holographic Lifshitz superconductors with Weyl correction

Dong

et al. 2020

Eur. Phys. J. C

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At the probe approximation, we construct a holographic p-wave conductor/superconductor model in the five-dimensional Lifshitz black hole with the Weyl correction via both numerical and analytical methods, and study the effects of the Lifshitz parameter z as well as the Weyl parameter $$\gamma $$ γ on the superconductor model. As we take into account one of the two corrections separately, the increasing z ($$\gamma $$ γ ) inhibits(enhances) the superconductor phase transition. When the two corrections are considered comprehensively, they display the obviously competitive effects on both the critical temperature and the vector condensate. In particular, the promoting effects of the Weyl parameter $$\gamma $$ γ on the critical temperature are obviously suppressed by the increasing Lifshitz parameter. Meanwhile, in the case of $$z<2.35$$ z < 2.35 ($$z>2.35$$ z > 2.35 ), the condensate at lower temperature decreases(increases) with the increasing Weyl parameter $$\gamma $$ γ . What is more, the difference among the condensate with the fixed Weyl parameter($$\gamma =-\frac{6}{100},0,\frac{4}{100}$$ γ = - 6 100 , 0 , 4 100 ) decreases(increases) with the increasing Lifshitz parameter z in the region $$z<2.35$$ z < 2.35 ($$z>2.35$$ z > 2.35 ). Furthermore, the increasing z obviously suppresses the real part of conductivity for all value of the Weyl parameter $$\gamma $$ γ . In addition, the analytical results agree well with the ones from the numerical method.

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Oxygen isotope homogeneity assessment for apatite U‐Th‐Pb geochronology reference materials

Cited by 15 publications

References 56 publications

Measuring in situ CO2 and H2O in apatite via ATR-FTIR

Measuring in situ CO2 and H2O in apatite via ATR-FTIR

Holographic p-wave superconductor with $$C^2F^2$$ correction

Holographic Lifshitz superconductors with Weyl correction

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