Erratum to: “Study of Changes in the Physiological State of Cyanobacteria Caused by Weak Ultrasonic Treatment”

Doklady Earth Sciences - The surname of the second author should read Grigoryeva     

Studying large-scale traveling ionospheric disturbances according to the data of oblique-incidence sounding

The morphological features of wave-like ionospheric disturbances with periods of 1–2 h and the spatial extent exceeding 1000 km are studied. Oblique-incidence sounding data of the ionosphere, obtained in eastern Siberia during several continuous monthly experiments on three radio paths from 2006 to 2010, have been used. Large-scale traveling ionospheric disturbances generated during magnetic storms and large-scale wave-like ionospheric disturbances registered during geomagnetically quiet periods are considered. Small-scale ionospheric structures were also observed against a background of large-scale traveling iono-spheric disturbances considered in this study.     

Infiltration metasomatism in layered intrusions revisited: a reinterpretation of compositional reversals at the base of cyclic units

Summary Irvine (1980) proposed an elegant mechanism termed “infiltration metasomatism” to explain upward displacement of discontinuities in mineral compositional trends relative to contacts between cyclic units in the Muskox intrusion. It was concluded that the offsets of Mg/(Mg + Fe) discontinuities in olivine and chromite are a secondary postmagmatic feature that resulted from reaction between the cumulus minerals and intercumulus liquid that was frontally displaced upwards from the underlying crystal pile as a result of compaction. We reinterpret this feature in the Muskox and other layered intrusions as basal reversals that arise from a temperature gradient-driven flux of low melting point components from the hot magma parental to cyclic units towards a relatively cold cumulate floor. In this interpretation basal reversals are a primary magmatic feature that does not involve intercumulus liquid migration. Authors’ addresses: R. M. Latypov, S. Yu. Chistyakova, Kola Science Centre, Geological Institute, Fersman Str. 16, 184200, Apatity, Russia; Present address: Department of Geosciences, University of Oulu, Oulu, P.O. Box 3000, FIN-90014, Finland; T. T. Alapieti, Department of Geosciences, University of Oulu, Oulu, P.O. Box 3000, FIN-90014, Finland     

Peculiarities of accessory zircon from the carter seamount tuffs (Sierra Leone Rise in the East Atlantic)

In volcanic tuffs, dredged during Cruise 23 of the R/V Akademik Nikolaj Strakhov, accessory zircon was found; except for the mineral-forming components, there were ∼2% of ThO₂ and 0.75% of Ce₂O₃ in zircon. During rapid uplift of magmatic masses to the ocean bottom surface, admixture elements isolated into specific minerals. As a result, destruction structures were formed in the rim parts of primary zircon crystals, and the new-formed association of zircon + thorite + cerite + thoriante + baddeleyite appeared.     

Inclusions in chrysolite from the Kovdor Massif: Genetic and gemmological significance

Gem-quality chrysolite (peridot) from a phlogopite deposit related to the Kovdor ultrabasic-alkaline massif in the Kola Peninsula, Russia, was studied using a variety of techniques (optical mineralogical microscopy, chemical, Mössbauer spectroscopy, and photoluminescence) to determine its chemical composition, the Fe²⁺/Fe³⁺ ratio, refraction indexes, density, as well as to examine inclusions in it. Much attention was devoted to the microprobe identification of crystalline inclusions in the host chrysolite (apatite, tetraferriphlogopite, amphibole, and magnetite), its exsolution products (diopside and magnetite), and the daughter phases of melt inclusions in this mineral (which were subdivided into primary and secondary genetic types). The daughter phases of these melt inclusions are silicates (forsterite, diopside, tetraferriphlogopite, clinohumite, and serpentine), various carbonates (Ca-dominated carbonates are characteristic of the primary inclusions, whereas Mg-rich carbonates were found only in the secondary inclusions), magnetite, djerfisherite (alkali sulfide), and Ba-Sr-REE carbonates. The presence of melt inclusions testifies to a magnatic genesis of the gem, and the simultaneous occurrence of these inclusions with crystalline inclusions can be used as an additional identification feature of gem chrysolite from the Kovdor Massif.     

Study of changes in the physiological state of cyanobacteria caused by weak ultrasonic treatment

The effect of weak ultrasonic radiation with a frequency of 60 kHz on photosynthetic activity of living cells of cyanobacteria was studied using microspectrometric methods for the first time. An inhibitory effect on the physiological state of separate cells and the whole culture was demonstrated. A high efficiency of the method developed by the authors of this article for determination of the viability of cyanobacterial cultures in vivo for the purpose of operational environmental monitoring of the results of weak external influences was demonstrated.

     

Fine-grained mafic bodies as preserved portions of magma replenishing layered intrusions: the Nadezhda gabbronorite body, Lukkulaisvaara intrusion, Fennoscandian Shield, Russia

Summary The 100 m thick and 700 m long Nadezhda body in the Lukkulaisvaara layered intrusion exhibits concentric zonation with an inward progression from a 0.5 to 1.0 m thick marginal layer of medium- to coarse-grained norites and gabbronorites that abruptly give way to fine-grained oikocrystic gabbronorites composing the rest of the body. The concentric zonation is additionally emphasized by well-developed alignment of plagioclase laths and orthopyroxene oikocrysts parallel to the outer contacts of the body, pegmatitic gabbronorite segregations in the centre of the body and slight inward decrease in whole-rock Mg# and Cr and increase in incompatible elements. The body has distinctly higher whole-rock Mg# and lower concentrations of all incompatible components than its host rocks. It is enveloped by highly altered marginal anorthosites belonging to host norites and gabbronorites. We interpret the Nadezhda body as a portion of high Mg# (∼75%) and incompatible element-poor (∼20 ppm, Zr; ∼10 ppm, total REE; ∼0.20 wt%, TiO₂) magma that replenished the evolving chamber and became trapped within the cumulate pile. Recrystallization of adjacent rocks by volatiles exsolved from the magma upon emplacement resulted in formation of marginal anorthosites. Upon cooling the magma started to crystallize medium- to coarse-grained norites along its margins, but subsequent decompression and loss of volatiles led to rapid crystallization of magma into fine-grained oikocrystic gabbronorites. Solidification of the remaining residual liquid gave rise to pegmatitic gabbronorite segregations. Supplementary material to this paper is available in electronic form at Tables 3–6 available as electronic supplementary material Authors’ addresses: R. M. Latypov, S. Yu. Chistyakova, Kola Science Centre, Geological Institute, Fersman Str. 16, 184200 Apatity, Russia; Present address: Department of Geosciences, University of Oulu, P.O. Box 3000, Oulu, FIN-90014, Finland; T. T. Alapieti, Department of Geosciences, University of Oulu, P.O. Box 3000, Oulu, FIN-90014, Finland