Geochemical Reversals within the Lower 100 M of the Palisades Sill, New Jersey

Transects through the lower part of the Palisades sill were made at Fort Lee and Alpine, New Jersey in order to characterize the petrologic signature of previously proposed reversals in the normal, tholeiitic differentiation trend. Petrographic and geochemical data include: (1) modal and grain size analyses, (2) bulk rock major and trace element concentrations by DCP-AES, and (3) augite, orthopyroxene, magnetite, and olivine compositions by electron microprobe analysis. Anomalous horizons, defined by increased bulk rock Mg#, Cr, Ni, and Co concentrations and abrupt modal and grain-size changes, occur at 10 m (the well known olivine zone), 27 m, 45 m, and 95m above the basal contact. Thermal models coupled with estimates of the emplacement rate and total magma volume indicate that the olivine zone (OZ) is an early-stage feature, related to the emplacement of initial magma into the Palisades chamber. Stoke\u27s Law calculations indicate that the settling velocity of average-sized olivine crystals in a high-titanium, quartz-normative (HTQ) magma is too slow for significant gravity settling to have occurred prior to the solidification of the basal 20 m of the sill. It is suggested that the OZ resulted from the emplacement of a heterogeneous initial magma from a compositionally stratified, sub-Palisades storage chamber located within the upper crust; however, heterogeneity may have been derived directly from the mantle or during rapid ascent. Geochemical models indicate that the OZ contains accumulated olivine that is not in cotectic (or constant) proportions with the other cumulus phases, suggesting a mechanical sorting process. Magma chamber recharge is proposed to have occurred at the 27 m and 45 m levels, when a slightly more-primitive HTQ magma was injected into the Palisades sill chamber. Zones of elevated Mg# and Cr, 6 to 10 m thick, at these two horizons may indicate the thickness of the hybrid magma formed by the mixing of these two compositions. Geochemical models indicate that the rocks at these levels have accumulated excess orthopyroxene relative to samples from the rest of the sill. Normal faulting in the Fort Lee area at the 95 m level has caused repetition of the stratigraphic section, and hence, the sharp reversal observed at this level

Isotopic Composition of Late Neogene K-Na Alkaline Basalts of Eastern Kamchatka: Indicators of the Heterogeneity of the Mantle Magma Sources

Isotopic composition of Sr, O, Nd, and Pb was determined in K-Na alkaline gabbroids and basaltoids that formed in eastern Kamchatka during Middle Miocene (gabbroids of the subvolcanic complex) and Late Miocene (basaltoids of the volcanic complex) time, before the origin of the Eastern Kamchatka Volcanic Belt. The variations in the isotopic parameters of the gabbroids and basaltoids are, respectively, as follows: 87Sr/86Sr = 0.70381-0.70465 and 0.70362-0.70512, no data on δ18O and δ18O ranging from +6.0 to +10.4‰, εNd ranges from +3.8 to +10.4 and from +2.0 to +7.1, 206Pb/204Pb = 17.818-18.164 and 17.880-18.105, 207Pb/204Pb = 15.427-15.475 and 15.479-15.537, 208Pb/204Pb = 37.542-37.964 and 37.950-38.239. Systematic covariations were detected for isotopes of Sr, O, Nd, and Pb with one another and with some geochemical parameters of the rocks. This led us to propose a two-component mixing model for the initial magmas, which were produced by the melting of the material of an enriched mantle plume (EM 1) and the depleted mantle of the MORE type. Isotopic data provide further evidence that the sources of the Late Cenozoic volcanics of the within-plate and island-arc geochemical types were different

Rodinian Collisional and Escape Tectonics in the Hudson Highlands, New York

A new multidisciplinary research collaboration to study the western Hudson Highlands, New York, has unraveled a complex Rodinian tectonic history that will be illustrated by visiting key locations on this trip. New sensitive high-resolution ion microprobe (SHRIMP) data demonstrates a cryptic suture between a ca. 1.2-1.1 Ga island arc and sedimentary rocks from a deeply incised craton (Amazonia?). The 1.05 Ga collision between these two terranes produced westward-directed fold nappes, granulite facies metamorphism and the dominant subhorizontal gneissic foliation. Tectonic surge granite sheets were emplaced into the nappes. Bimodal (diorite and granite) plutons intruded the area prior to the onset of a steeply SE-dipping 35-kmwide dextral shear system that resulted from tectonic escape. Extensive iron remobilization and mineralization accompanied the shearing and post-kinematic pegmatite plutons mark the end of activity at ca. 980 Ma

Infertility against the background of chronic endometritis and vaginal dysbiosis: preimplantation preparation experience

Introduction. Vaginal infections of nonspecific etiology caused by microbiocenosis disorder is one of the leading aspects of gynecological morbidity in recent times. According to research statistics, the incidence of such disease varies from 30 to 80% among all inflammatory lower genital tract diseases in women. Aim of the study: to present the experience of preparation for ART in patients with chronic endometritis against the background of mixed forms of vaginal dysbiosis. Material and methods. The results of treatment with a drug containing metronidazole and miconazole nitrate (vaginal suppositories once a day at bedtime for 7 days) were studied in combination with natural micronized progesterone in 36 women with infertility caused by endometrial receptivity disorder due to chronic endometritis against the background of vaginal dysbiosis, in whom pre-implantation preparation with embryo transfer was carried out after the end of the therapy. The following were used: assessment of microbiota status of urogenital tract – PCR (femoflor-16), measurement of vaginal environment pH, Hay/Ison criteria, endometrial pipelle biopsy and endometrial immunohistochemical evaluation of endometrial receptivity (LIF, LIF-R) on the 3rd and 7th days after LH peak. Conclusion. The presented experience of complex local therapy of women diagnosed with “Infertility against the background of chronic endometritis and vaginal dysbiosis“ using a drug containing metronidazole and miconazole and natural micronized progesterone in the form of vaginal gel can be useful for practicing obstetricians-gynecologists and other interested specialists