1,738,720 research outputs found
Composite depth scales, ash layer correlations and splice tie points of ODP Site 186-1151
No full textWe present composite depth scales for the multiply cored intervals from Sites 1150 and 1151. These new depth scales place coeval strata recovered in cores from different holes at a single site into a common stratigraphic framework. At Site 1150, double coring between Holes 1150A and 1150B occurred over only a short interval between ~703 and 713 meters below seafloor (mbsf), but this is sufficient to tie the upper portion of the stratigraphic section cored in Hole 1150A to the lower portion cored in Hole 1150B. The upper ~100 m of the sedimentary section at Site 1151 was double cored with the advanced piston corer and partially cored with the rotary core barrel, resulting in the complete recovery of this interval. The composite depth scales were constructed using Splicer software to vertically adjust the relative depths of various cores from one hole to the depths from another hole so as to align distinct physical properties measured on cores. The magnetic susceptibility data was the physical property most easily correlated between holes, and therefore primarily used to create a composite depth scale and spliced stratigraphic section. The spliced section is a continuous stratigraphic section constructed from representative cored intervals from the holes at a site. Both the splice and the composite depth scale can be applied to other data sets from Site 1151 to provide a stratigraphically continuous and laterally consistent basis for interpreting lithologic features or data sets. The resulting composite scale showed a 30% improvement in correlation of the magnetic susceptibility data relative to the original mbsf depth scale, and comparable improvement when applied to the other data sets
Stable isotope ratios and geochemical composition of authigenic carbonates from ODP Sites 186-1150 and 186-1151
No full textSeveral carbonaceous layers or fragments were recovered from sediments of Sites 1150 and 1151 on the deep-sea terrace of the Japan Trench during Leg 186. The X-ray diffraction analysis (XRD) data indicate that these are predominantly dolomitic. In this study, carbon and oxygen isotopes of these carbonates recovered at Sites 1150 and 1151 are presented. The oxygen isotope ratios of the dolomites analyzed range from +0.4 per mil to +4.1 per mil vs. Peedee formation belemnite (PDB) and those of calcites from +0.6 per mil to +2.8 per mil PDB. The isotopic composition of carbon varies from -7.0 per mil to +12.3 per mil PDB in dolomite and from -13.4 per mil to -24.1 per mil PDB in calcite. The wide range of carbon isotopic compositions indicates that the carbonate samples were formed by the decomposition of organic matter through reactions such as oxidation, sulfate reduction, and methane formation during diagenesis
(Table 1) Boron analyses from ODP Sites 186-1150 and 186-1151
No full textInterstitial pore waters from Ocean Drilling Program (ODP) Sites 1150 and 1151, both penetrating ca. 1200 m of sub-seafloor sediment from the upper Japan Trench forearc, were analyzed for B concentrations and d11B isotopes. B concentrations cover a wide range from 329 to 3920 µM (0.8-9.3* seawater) and vary isotopically from +20 to +46 per mil (relative to SRM 951). In general, B concentrations increase more or less steadily with depth. At both sites, the B enrichment and isotopic changes seem to be related to a deep fluid influence, possibly coupled with alteration of volcanic products. Silica diagenesis does not affect the B geochemistry of the waters, as is evident from intact diatom tests and high opal-A contents throughout the holes.
The B enrichment is more pronounced at Site 1150 in the seismic portion of the forearc. Here, a large positive anomaly in d11B values is observed, which corresponds with abundant fracturing and two prominent shear zones. At about the same depth range at Site 1151, the d11B values show a negative shift, attesting to an enrichment in 10B in the fluid as a result of B desorption from clay due to burial and tectonic stress. We conclude that B release from clay minerals is the major contributor to pore fluid anomalies, and that fluid flow through permeable out-of-sequence thrust (like the shear zones at Site 1150) may be an efficient mechanism for B backflux from the forearc into the hydrosphere
GJ 1151 CARMENES and HARPS-N data [Dataset]
No full textDetecting a planetary companion in a short-period orbit through radio emission from the interaction with its host star is a new prospect in exoplanet science. A tantalising signal was found by Vedantham et al. (2020NatAs...4..577V) close to the low-mass stellar system GJ 1151 using LOFAR observations. We studied spectroscopic time-series data of GJ 1151 to search for planetary companions and to investigate possible signatures of stellar magnetic activity and to find possible explanations for the radio signal. We used the combined radial velocities measured from spectra acquired with the CARMENES, HARPS-N, and HPF instruments, extracted activity indices from those spectra in order to mitigate the impact of stellar magnetic activity on the data, and analysed in detail Gaia astrometry, and all available photometric time series coming from the MEarth and ASAS-SN surveys. We found a M>10.6M_Earth_ companion to GJ 1151 in a 390-d orbit at a separation of 0.57au. Evidence for a second modulation is also present and could be due to long-term magnetic variability, or a second (substellar) companion. The star shows episodes of elevated magnetic activity, one of which could be linked to the observed LOFAR radio emission. We show that it is highly unlikely that the detected GJ 1151 b, or any additional outer companion can be the source of the detected signal. We cannot firmly rule out the explanation given by Vedantham et al. (2020NatAs...4..577V), as we establish an upper limit of 1.2M_Earth_ for the minimum mass of an undetected short-period planet that could be related to the radio emission.HARPS-N and CARMENES spectroscopic observations of GJ 1151.Financial support from the Severo Ochoa grant CEX2021-001131-S funded by MCIN/AEI/ 10.13039/501100011033N
Resolución UNRN Nº 1151/2011. Modifica Resolución UNRN Nº 775/2010
No full textFil: Universidad Nacional de Río Negro (U). Universidad Nacional de Río Negro. Río Negro, ArgentinaResolución UNRN Nº 1151/2011. Modifica la Resolución UNRN Nº 775/2010 en lo relativo a la redacción de un alcance de título final y la mención de la unidad académica que administra la carrera de ciclo de Licenciatura en Educación Primaria.fals
Calcium carbonate, organic carbon, δ¹³C and C/N composition of ODP Sites 186-1150 and 186-1151
No full textPast changes in sea-surface productivity in the Oyashio Current are evaluated on the basis of abundances of biological constituents in sediments from Leg 186 sites. Organic carbon contents at Sites 1150 and 1151 are moderate (0.5 to 1.5 wt%) and have an algal origin as indicated by low C/N ratios (<10) and by carbon isotopic compositions ranging from -23.4 to -21.3. A decreasing trend in organic carbon contents, carbon isotope ratios, and C/N ratios occurs with depth at both sites, probably as a consequence of diagenetic degradation of organic matter. Mass accumulation rates (MARs) determined for organic carbon and carbonates at Sites 1150 and 1151 show an abrupt increase between ~5 and 7 Ma. Similar results have been reported for sites in the Indian Ocean and the Pacific Ocean for the same time interval. As it has been previously suggested, the observed increase in MAR for both carbonate and organic carbon at Leg 186 sites probably resulted from augmented nutrient supply either from continental sources or from a more vigorous ocean circulation
Illinois commercial spray schedule, 1979 : apples, peaches, nectarines, apricots, plums, pears, and cherries : supplement to circular 1151
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Illinois commercial spray schedule, 1986 : apples, pears, peaches, nectarines, apricots, plums, and cherries : supplement to circular 1151
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Santa Fe (ATSF) 1151
No full textA photograph print showing Santa Fe (ATSF) 1151, 2-6-2, Vauclain Compound design, on passenger train, Clayton NM. Back of photo details locomotive's specifications
Illinois commercial spray schedule, 1982 : apples, peaches, nectarines, apricots, plums, pears, and cherries : supplement to circular 1151
Get PDF1151: 198
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