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High-pressure experimental verification of rutile-ilmenite oxybarometer: Implications for the redox state of the subduction zone

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Science China Earth Sciences 2017年第10期60卷 1817-1825页

作者： TAO RenBiao ZHANG LiFei vincenzo stagno CHU Xu LIU Xi The Key Laboratory of Orogenic Belt and Crustal Evolution School of Earth and Space SciencesPeking University Earth Sciences Department Sapienza University of Rome Department of Geology and Geophysics Yale University

The more oxidized mantle peridotites above subducting slabs than stable continental areas have been attributed to the infiltration of some oxidizing fluids released from the subducting slabs. However, knowledge for the redox states of the slabs itself is very limited. Until now, few oxybarometers can be directly used to constrain the redox states of the subducting *** rutile-ilmenite oxybarometer was proposed and successfully applied to constrain the oxygen fugacity of mantle ***, its application to rocks equilibrated at crustal P-T conditions has been hampered by some uncertainties in an early solid solution model of ilmenite. With a newly-released solid solution model for the ilmenite, we have conducted high-P experiments(at 3 and 5 GPa, and 900–1300°C) to test the accuracy of this oxybarometer. The experiments were performed with their oxygen fugacities controlled by the CCO buffer(i.e., C+O_2=CO_2). We demonstrated that the oxygen fugacities calculated for our high-P experimental products by using the rutile-ilmenite oxybarometer were in excellent agreement with the fO_2 dictated by the CCO buffer, suggesting a wide applicability of this oxybarometer to crust rocks. As examples, the rutile-ilmenite oxybarometer has been used to constrain the oxygen fugacities of some metamorphic rocks such as eclogite, granulite and amphibolite usually observed from the subduction zones.

关键词： High-pressure experiment Ilmenite-rutile oxybarometer Oxygen fugacity Subduction zone

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Generalized Skew Derivations and Nilpotent Values on Lie Ideals

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Algebra Colloquium 2019年第4期26卷 589-614页

作者： vincenzo De Filippis Onofrio Mario Di vincenzo Nanqing Ding Department of Engineering University of Messina Viale F.Stagno D'Alcontres 3198166 MessinaItaly Department of Mathematics and Computer Sciences University of Basilicata Viale dell}Ateneo LucanoMacchia Romana85100 PotenzaItaly 不详

Let R be a prime ring of characteristic different from 2 and 3,Qr be its right Martindale quotient ring and C be its extended *** that F and G are generalized skew derivations of R,L a non-central Lie ideal of R and n≥1 a fixed positive *** appropriate conditions we prove that if(F(x)x;—xG(x))^n=0 for all x∈L,then one of the following holds:(a)there exists c∈Qr such that F(x)=xc and G(e)=cx;(b)R satisfies S4 and there exist a,b,c∈Qr such that F(x)=ax+xc,G(x)=cx+xb and(a—b)^2=0.

关键词： generalized skew derivation prime ring

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