The determination of copper and zinc in W-1 by the atomic absorption flame photometry

Copper and zinc in W-1 have been determined using a Jarrell-Ash Model 82-360 atomic absorption flame photometer. The results are 116 ± 3 ppm for Cu and 86 ± 3 ppm for Zn. (Errors are expressed by the probable error of the mean of four determinations.) These results compare favorably with the recently reported values, thereby suggesting that the background absorption effect is practically negligible in these concentration ranges. Net sample consumption was about 20 mg of W-1 powder per element

Mineralogy of Granulite Facies Rocks in the Area around Lutzow-Holm Bay, Antarctica

The chemical compositions of constituent minerals of metamorphic rocks of the area around Lutzow-Holm Bay in Antarctica are described along with their optic properties. The mineralogy and paragenesis of metamorphic rocks are interpreted as that the metamorphic rocks in this terrane belong to the granulite facies

NBRP databases: databases of biological resources in Japan

The National BioResource Project (NBRP) is a Japanese project that aims to establish a system for collecting, preserving and providing bioresources for use as experimental materials for life science research. It is promoted by 27 core resource facilities, each concerned with a particular group of organisms, and by one information center. The NBRP database is a product of this project. Thirty databases and an integrated database-retrieval system (BioResource World: BRW) have been created and made available through the NBRP home page (http://www.nbrp.jp). The 30 independent databases have individual features which directly reflect the data maintained by each resource facility. The BRW is designed for users who need to search across several resources without moving from one database to another. BRW provides access to a collection of 4.5-million records on bioresources including wild species, inbred lines, mutants, genetically engineered lines, DNA clones and so on. BRW supports summary browsing, keyword searching, and searching by DNA sequences or gene ontology. The results of searches provide links to online requests for distribution of research materials. A circulation system allows users to submit details of papers published on research conducted using NBRP resources

Schreinemakers' nets for Group B and C Eclogites in a Model 4-Component and 8-Phase System

Petrogenetic grids for Group B and C eclogites, which were formed in the jadeite-quartz stability field, are constructed in a model 4-component and 8-phase system, with excess Fe-rich garnet. 8 geometrically independent nets are derived from this model system which treats univariant curves as straight lines. Varying the composition of the excess garnet causes topological changes in the nets and three topologically similar groups can be distinguished: Set I with the most Fe-rich garnet, Set II with intermediate garnet composition, and Set III with garnet richer in Mg than usual group C eclogites. All possible nets for Sets I and II will be presented and the most plausible net will be chosen by comparing them with petrographic and synthetic evidence

Use of partial solution of multi˗component equilibria. Case study on pyroxene˗bearing assemblages

A comparison of phase equilibrium relations between simple and multi-component systems was reviewed with some new approaches for garnet-orthopyroxene, garnet-clinopyroxene and clino-and orthopyroxene equilibira. The equation of the type ln (a[A]α/a[A]β) = — ΔG/RT is valid in both simple and multicom-ponent systems. The term — ΔG/RT can be obtained from the synthetic experiments on simple and multicomponent systems using appropriate crystallochemical models of solid solutions. They agree fairly well if the simple system is of CaSiO₃-MgSiO₃-Al₂O₃ and the other of ultramafic and basaltic compositions. The clinopyroxene-orthopyroxene equilibria in regard to enstatite component can be used to estimate temperature within the accuracy of 40 to 60° C above 1 000° C, and garnet orthopyroxene equilibrium can be used to determine the pressure with the accuracy of 2-3 kbar. Geological implications of this method to the study of natural rock system are briefly discussed.Nouvelle comparaison des équilibres de phases entre systèmes simples et multicomposants utilisant comme exemples des équilibres grenat˗orthopyroxène, grenat˗clinopyroxène et orthopyroxène˗clinopyroxène. L'équation du type ln (a[A]α/a[A]β) = — ΔG/RT [où a[A] est l'activité du composant A dans les phases α et ß] est valable aussi bien dans les systèmes simples que dans les systèmes multicomposants. Le terme — ΔG/RT peut être obtenu à partir des données expérimentales sur des systèmes simples et multicomposants, en utilisant des modèles cristallochimiques de solutions solides appropriés. Ils conviennent particulièrement bien si le système simple est CaSiO₃-MgSiO₃-Al₂O₃ ou une composition de type ultramafique ou basaltique. En ce qui concerne le composant enstatite, l'équilibre clinopyroxène˗orthopyroxène peut être utilisé pour estimer la température de formation à ± 40° à 60° près dans un domaine de températures supérieures à 1 000° C et l'équilibre grenat˗orthopyroxène peut être utilisé pour déterminer la pression à ± 2-3 kbars près. Conséquences géologiques de cette méthode sur l'étude des roches naturelles.Banno Shohei. Use of partial solution of multi˗component equilibria. Case study on pyroxene˗bearing assemblages. In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 97, 2-5, 1974. Les solutions solides en minéralogie. Colloque international du C.N.R.S. n° 234. 27-30 mai 1974, Orléans, France