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271.
The scheme of recent fault tectonics and neotectonic stresses of the area adjacent to the Strel’tsovka Caldera in the southeastern
Transbaikal region has been compiled for the first time on the basis of structural and geomorphic study. The faults were ranked
by criteria of slip direction stability along separate segments and their expression in topography. Neotectonic stresses of
corresponding ranks were ascertained as well. The heterogeneity of neotectonic stress field is related to the mosaic development
of compression, extension, and the three-axial stress state. Comparison of morphogenetic features of recent and older faults
shows the different character of the deformation mechanism and orientation of tectonic displacements. It has been established
that the Strel’tsovka Caldera and its northwestern segment, in particular, developed as an echeloned system of pull-apart
grabens, but the caldera itself is situated in a recent rise, whereas the northwestern segment is located in a neotectonic
depression corresponding to the Dry Urulyungui Basin filled with volcanic and sedimentary rocks. Such a structure markedly
expands the outlook for discovery of hidden uranium mineralization in the studied area. The elaborated scheme of neotectonic
faults and stresses reflects the postore geodynamic setting and completes the reconstruction of geodynamic conditions pertaining
to the periods of preore preparation and ore-forming tectonomagmatic reactivation. 相似文献
272.
273.
274.
Determination of REE, Y, Nb, Zr, Hf, Ta, Th and U in Geological Reference Materials LSHC-1 and Amf-1 by Solution and Laser Ablation ICP-MS 总被引:1,自引:0,他引:1
Elena V. Smirnova Belinda Flem Elena A. Anchutina Irina N. Mysovskaya Valeriy I. Lozhkin Lev L. Petrov † 《Geostandards and Geoanalytical Research》2010,34(1):49-65
This paper presents data on REE and Y, Nb, Zr, Hf, Ta, Th and U abundances for two candidate reference materials (RMs), spinel lherzolite LSHC-1 and amphibole Amf-1, being currently developed at the Institute of Geochemistry SB RAS, Irkutsk. To determine the contents of these elements inductively coupled plasma-mass spectrometry was applied with: (i) solution nebulisation (solution ICP-MS) and (ii) laser ablation (LA-ICP-MS) of fused glass disks. The precision of results obtained by both techniques was better than 6% RSD for most elements. Accuracy was assessed by using the geochemical RMs JB-2, JGb-1 (GSJ) and MAG-1 (USGS). The trace element results by solution ICP-MS for JGb-1 and JB-2 agree with reference values presented by Imai et al. (1995, this Journal) within 1–10%. Significant differences were found for Nb and Ta determinations. The accuracy of LA-ICP-MS results evaluated by RM MAG-1 was within 4%, except for Eu (about 10%). The analytical results obtained for LSHC-1 and Amf-1 by solution ICP-MS and LA-ICP-MS were in good agreement with each other and with INAA and XRF data presented for the certification of these RMs. They can be considered as the indicative values for assigning certified values to the above-mentioned RMs. 相似文献
275.
V. Yu. Kuznetsov E. V. Tabuns K. A. Kuksa G. A. Cherkashov V. E. Bel’tenev Kh. A. Arslanov F. E. Maksimov L. I. Lazareva A. I. Zhuravleva A. Yu. Petrov V. A. Grigoriev 《Doklady Earth Sciences》2018,480(2):700-704
This paper reports on the integrated geochronological and geochemical methods used in studying the ore deposits and metalliferous sediments of the Yubileinoye field. This study gives the opportunity to carry out cross dating of hydrothermal deposits, including the 230Th/U dating of sulfides, the 230Th, 14C dating, and foraminiferal analysis of the sediments, and, on this basis, to reconstruct hydrothermal activity over time. It was established that the ores started forming about 100 000–123 000 years ago and were renewed 4–5 times with a frequency of 10–20 ka. As a result, the complex of pyrite-marcasite, chalcopyrite and sphalerite ores and the associated metal-bearing and ore-bearing sediments with consistent geochemical specialization were formed. The integrated geochronological and geochemical studies of the ores and sediments allow us to obtain detailed data on evolution of the hydrothermal ore-formation not only in the certain areas but also for the entire Mid-Atlantic Ridge. 相似文献