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Journal articles on the topic 'Geochronological'

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Published: 10 December 2022

Last updated: 28 January 2023

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1

DuRoss, Christopher B., Ryan D. Gold, Harrison J. Gray, and Sylvia R. Nicovich. "Portable optically stimulated luminescence age map of a paleoseismic exposure." Geology 50, no. 4 (January 11, 2022): 470–75. http://dx.doi.org/10.1130/g49472.1.

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Abstract The quality and quantity of geochronologic data used to constrain the history of major earthquakes in a region exerts a first-order control on the accuracy of seismic hazard assessments that affect millions of people. However, evaluations of geochronological data are limited by uncertainties related to inherently complex depositional processes that may vary spatially and temporally. To improve confidence in models of earthquake timing, we use a high-density suite of radiocarbon and optically stimulated luminescence (OSL) ages with a grid of 342 portable OSL samples to explore spatiotemporal trends in geochronological data across an exemplary normal fault colluvial wedge exposure. The data reveal a two-dimensional age map of the paleoseismic exposure and demonstrate how vertical and horizontal trends in age relate to dominant sedimentary facies and soil characteristics at the site. Portable OSL data provide critical context for the interpretation of 14C and OSL ages, show that geochronologic age boundaries between pre- and post-earthquake deposits do not match stratigraphic contacts, and provide the basis for selecting alternate Bayesian models of earthquake timing. Our results demonstrate the potential to use emergent, portable OSL methods to dramatically improve paleoseismic constraints on earthquake timing.

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2

Sircombe, K. N. "Standardising geochronological data." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A594. http://dx.doi.org/10.1016/j.gca.2006.06.1102.

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3

XIAO, LING-LING, GUO-DONG WANG, HAO WANG, ZONG-SHENG JIANG, CHUN-RONG DIWU, and CHUN-MING WU. "Zircon U–Pb geochronology of the Zanhuang metamorphic complex: reappraisal of the Palaeoproterozoic amalgamation of the Trans-North China Orogen." Geological Magazine 150, no. 4 (April 30, 2013): 756–64. http://dx.doi.org/10.1017/s001675681300006x.

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AbstractAmphibolites and metapelites exposed in the Zanhuang metamorphic complex situated in the south-middle section of the Trans-North China Orogen (TNCO) underwent upper-amphibolite-facies metamorphism and record clockwise P–T paths including retrograde isothermal decompression. High-resolution zircon U–Pb geochronological analyses indicate that the metamorphic peak occurred during ~ 1840–1860 Ma, which is in accordance with the ubiquitous metamorphic ages of ~ 1850 Ma retrieved by miscellaneous geochronologic methods throughout the metamorphic terranes of the northern TNCO, confirming that the south-middle section of the TNCO was involved in the amalgamation of the Eastern and Western Blocks of the North China Craton during the Palaeoproterozoic.

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4

Popov, Daniil V. "Short communication: On the potential use of materials with heterogeneously distributed parent and daughter isotopes as primary standards for non-U–Pb geochronological applications of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS)." Geochronology 4, no. 1 (June 15, 2022): 399–407. http://dx.doi.org/10.5194/gchron-4-399-2022.

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Abstract. Many new geochronological applications of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) have been proposed in recent years. One of the problems associated with this rapid growth is the lack of chemically and isotopically homogeneous matrix-matched primary standards to control elemental fractionation during LA-ICP-MS analysis. In U–Pb geochronological applications of LA-ICP-MS this problem is often addressed by utilising matrix-matched primary standards with variable chemical and isotopic compositions. Here I derive a set of equations to adopt this approach for non-U–Pb geochronological applications of LA-ICP-MS.

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5

Harris, N. B. W., and J. Bartlett. "Geochronological framework of South India." Journal of Southeast Asian Earth Sciences 14, no. 5 (December 1996): IV—V. http://dx.doi.org/10.1016/s0743-9547(97)88149-4.

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6

Harris, N. B. W., and J. Bartlett. "Geochronological framework of South India." Journal of African Earth Sciences 23, no. 2 (August 1996): IV—V. http://dx.doi.org/10.1016/s0899-5362(97)86870-4.

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7

Harris, N. B. W., and J. Bartlett. "Geochronological framework of South India." Journal of South American Earth Sciences 10, no. 3-4 (May 1997): IV—V. http://dx.doi.org/10.1016/s0895-9811(97)90002-x.

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8

Pellenbarg, Robert E., Eric C. DeCarlo, Michael E. Boyle, and Robert A. Lamontagne. "Sedimentary Siloxanes: A Geochronological Study." Applied Organometallic Chemistry 11, no. 4 (April 1997): 345–49. http://dx.doi.org/10.1002/(sici)1099-0739(199704)11:4<345::aid-aoc588>3.0.co;2-x.

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9

Ivakin, R., Y. Ivakin, and S. Potapichev. "Refinement Algoritm of Hypotheses Testing Research Based on Geochronological Tracking." Proceedings of Telecommunication Universities 6, no. 1 (2020): 86–93. http://dx.doi.org/10.31854/1813-324x-2020-6-1-86-93.

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Geochronological tracking is an effective information technology for digital cartographic spatial data sets processing. It is widely known in retrospective patterns research about geographic relocation of figures, or any other units for a given time interval. Software component of geochronological tracking is becoming one the most popular GIS-integrated applications. The article presents the basic provisions for the algorithmization of the geochronological tracking procedure for statistical testing of retrospective studies hypotheses. We can observe the results of solving this optimization problem in a general form and in a number of the most typical variants. The obtained results of solving the optimization problem are interpreted in terms of the retrospective studies subject area. There are shown the ways of further practical application of the optimized algorithm in the tasks of modern logistics, data mining and formalized knowledge.

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10

Tassinari, Colombo C. G., and Moacir J. B. Macambira. "Geochronological provinces of the Amazonian Craton." Episodes 22, no. 3 (September 1, 1999): 174–82. http://dx.doi.org/10.18814/epiiugs/1999/v22i3/004.

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11

Ahrendt, H., C. Chonglakmani, B. T. Hansen, and D. Helmcke. "Geochronological cross section through northern Thailand." Journal of Southeast Asian Earth Sciences 8, no. 1-4 (January 1993): 207–17. http://dx.doi.org/10.1016/0743-9547(93)90022-h.

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12

Ivakin, Y., S. Potapichev, and V. Elagin. "AN ALGORITHM FOR EVALUATING AND IMPROVING THE STATISTICAL STABILITY OF THE RESULTS OF RETROSPECTIVE STUDIES BASED ON GEOCHRONOLOGICAL TRACKING." Telecom IT 9, no. 2 (July 28, 2021): 95–111. http://dx.doi.org/10.31854/2307-1303-2021-9-2-95-111.

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Geochronological tracking has been accorded wide recognition as an appropriate scientific and methodological toolkit and an effective information technology for retrospective research in the interests of substantiating and rationalizing transport route net-works, transportation logistics, analyzing the facts of population migration and movements of individual historical figures. A procedure based on geochronological tracking for statistical verification of research hypotheses has been developed about robust trends in the development of various spatiotemporal processes. The eliability and validity of accepting a particular hypothesis within the framework of a retrospective study is determined by the representativeness of the initial dataset on geographic movements, considered as a sample from the general population. The statistical significance (robustness) of the results of a retrospective study based on geochronological tracking depends on the sufficiency of the considered initial data on the movements of the objects under study. This article is devoted to the analysis of this dependence and the development of an algorithm for assessing the specified robustness (or significance).

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13

Palyvos, N., D. Sorel, F. Lemeille, M. Mancini, D. Pantosti, R. Julia, M. Triantaphyllou, and P. M. De Martini. "REVIEW AND NEW DATA ON UPLIFT RATES AT THE W TERMINATION OF THE CORINTH RIFT AND THE NE RION GRABEN AREA (ACHAIA, NW PELOPONNESOS)." Bulletin of the Geological Society of Greece 40, no. 1 (June 8, 2018): 412. http://dx.doi.org/10.12681/bgsg.16631.

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We review and present new geochronological data on the uplifted Middle-Late Pleistocene marine deposits at the western termination of the Corinth Rift and the Rion area. Geomorphological and geological observations define the general morphotectonic context of these deposits, which predicts a pattern of differential uplift. Uplift rate estimates based on previous geochronological data (ranging from 0.4 to 6 mm/yr) are discussed in the proposed morphotectonic context of differential uplift, together with estimates from new geochronological data. Based on the data available for post-MISl 1 marine deposits, we conclude that time-averaged uplift rates in the last 300-200 lea have been higher than ca. 1.8 mm/yr at the areas of faster uplift (e.g. Profus Elias, Ano Kastritsi). To define just how higher than 1.8 mm/yr they have been, and to cross-check the validity of very high uplift rate estimates (> 4 mm/yr) existing in the bibliography, more datings than those available are required.

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14

Kuznetsov, V., G. Cherkashov, K. Kuksa, A. Firstova, F. Maksimov, V. Bel’Tenev, L. Lazareva, S. Levchenko, and N. Baranova. "Chronology of seafloor massive sulfides formation within the Pobeda hydrothermal cluster (Mid-Atlantic Ridge)." Geochronometria 47, no. 1 (January 1, 2020): 63–70. http://dx.doi.org/10.2478/geochr-2020-0019.

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Abstract A geochronological and mineralogical study on the seafloor massive sulfides from the Pobeda hydrothermal cluster at the Mid-Atlantic Ridge was carried out. To improve the reliability of geochronological data, the 230Th/U ages were measured for both the bulk samples and monomineral separates. The oldest age ca. 52 kyr within Pobeda-1 and ca. 107 kyr within Pobeda–2 fields have been obtained. Then, several episodes of hydrothermal activity were identified within both fields up to ca. 0.3 kyr ago and up to ca. 4.3 kyr ago, respectively.

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15

Kuznetsov, V., G. Cherkashov, K. Kuksa, A. Firstova, F. Maksimov, V. Bel’Tenev, L. Lazareva, S. Levchenko, and N. Baranova. "Chronology of seafloor massive sulfides formation within the Pobeda hydrothermal cluster (Mid-Atlantic Ridge)." Geochronometria 47, no. 1 (December 31, 2020): 63–70. http://dx.doi.org/10.2478/geochr-2020-0019.

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AbstractA geochronological and mineralogical study on the seafloor massive sulfides from the Pobeda hydrothermal cluster at the Mid-Atlantic Ridge was carried out. To improve the reliability of geochronological data, the 230Th/U ages were measured for both the bulk samples and monomineral separates. The oldest age ca. 52 kyr within Pobeda-1 and ca. 107 kyr within Pobeda–2 fields have been obtained. Then, several episodes of hydrothermal activity were identified within both fields up to ca. 0.3 kyr ago and up to ca. 4.3 kyr ago, respectively.

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16

Bowring, Samuel A., Blair Schoene, James L. Crowley, Jahandar Ramezani, and Daniel J. Condon. "High-Precision U-Pb Zircon Geochronology and the Stratigraphic Record: Progress and Promise." Paleontological Society Papers 12 (October 2006): 25–45. http://dx.doi.org/10.1017/s1089332600001339.

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High-precision geochronological techniques have improved in the past decade to the point where volcanic ash beds interstratified with fossil-bearing rocks can be dated to a precision of 0.1% or better. The integration of high-precision U-Pb zircon geochronology with bio/chemo-stratigraphic data brings about new opportunities and challenges toward constructing a fully calibrated time scale for the geologic record, which is necessary for a thorough understanding of the distribution of time and life in Earth history. Successful implementation of geochronology as an integral tool for the paleontologist relies on a basic knowledge of its technical aspects, as well as an ability to properly evaluate and compare geochronologic results from different methods. This paper summarizes the methodology and new improvements in U-Pb zircon geochronology by isotope dilution thermal ionization mass spectrometry, specifically focused on its application to the stratigraphic record.

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17

Arslanov, Kh A. "Late Pleistocene Geochronology of European Russia." Radiocarbon 35, no. 3 (1993): 421–27. http://dx.doi.org/10.1017/s0033822200060434.

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18

Ivakin, Ya A., S. N. Potapychev, V. V. Karetnikov, A. A. Butsanets, and E. O. Olkhovik. "Optimization of hydrographic studies using geochronological tracking." IOP Conference Series: Earth and Environmental Science 867, no. 1 (October 1, 2021): 012010. http://dx.doi.org/10.1088/1755-1315/867/1/012010.

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19

Cheong, Chang-Sik. "2014, Application of Geochronological and Isotopic Data." Journal of the Petrological Society of Korea 23, no. 3 (September 30, 2014): 163–65. http://dx.doi.org/10.7854/jpsk.2014.23.3.163.

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20

ZHANG, Wenlan, Xudong CHE, Rucheng WANG, Rongqing ZHANG, and Zhen YANG. "Geochronological Framework of the Penggongmiao Granite Batholith ••." Acta Geologica Sinica - English Edition 88, s2 (December 2014): 1041–42. http://dx.doi.org/10.1111/1755-6724.12378_38.

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21

Sal’nikova, E. B., S. Z. Yakovleva, A. V. Nikiforov, A. B. Kotov, V. V. Yarmolyuk, I. V. Anisimova, A. M. Sugorakova, and Yu V. Plotkina. "Bastnaesite: a promising U-Pb geochronological tool." Doklady Earth Sciences 430, no. 1 (January 2010): 134–36. http://dx.doi.org/10.1134/s1028334x10010290.

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22

Eyster, Athena, Benjamin P. Weiss, Karl Karlstrom, and Francis A. Macdonald. "Paleomagnetism of the Chuar Group and evaluation of the late Tonian Laurentian apparent polar wander path with implications for the makeup and breakup of Rodinia." GSA Bulletin 132, no. 3-4 (June 17, 2019): 710–38. http://dx.doi.org/10.1130/b32012.1.

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AbstractPaleogeographic models commonly assume that the supercontinent Rodinia was long-lived, with a static geometry involving Mesoproterozoic links that developed during assembly and persisted until Neoproterozoic rifting. However, Rodinian paleogeography and dynamics of continental separation around its centerpiece, Laurentia, remain poorly constrained. On the western Laurentian margin, geological and geochronological data suggest that breakup did not occur until after 720 Ma. Thus, late Tonian (ca. 780–720 Ma) paleomagnetic data are critical for reconstructing paleogeography prior to dispersal and assessing the proposed stasis of Rodinia. Here, we report new paleomagnetic data from the late Tonian Chuar Group in the Grand Canyon, Arizona. We combined this new data set with reanalyzed existing data to obtain a new paleopole preserved in hematite, the reliability of which is supported by six of the seven (Q1–Q6) Van der Voo reliability quality criteria. In addition, we identified pervasive mid- to high-temperature overprints. This new paleomagnetic pole was incorporated with recent high-precision geochronological data and existing paleomagnetic data to present a new late Tonian Laurentian apparent polar wander path (APWP). Having examined the paleomagnetic data of other cratons, global reconstructions for 775 Ma, 751 Ma, and 716 Ma are presented. These reconstructions are consistent with Australia located near the present southern margin of Laurentia. However, a stringent analysis of the global data set does not support a good match between any major craton and the rifted conjugate margin to western Laurentia. Breakup on the western Laurentian margin may have involved rifting of a continental fragment or a craton with uncertainties in its late Tonian geochronologic and paleomagnetic constraints. Our revised Laurentian APWP will allow for more robust tests of paleogeography and evaluation of the proposed supercontinent Rodinia.

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23

Ely, Jeremy C., Chris D. Clark, David Small, and Richard C. A. Hindmarsh. "ATAT 1.1, the Automated Timing Accordance Tool for comparing ice-sheet model output with geochronological data." Geoscientific Model Development 12, no. 3 (March 12, 2019): 933–53. http://dx.doi.org/10.5194/gmd-12-933-2019.

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Abstract. Earth's extant ice sheets are of great societal importance given their ongoing and potential future contributions to sea-level rise. Numerical models of ice sheets are designed to simulate ice-sheet behaviour in response to climate changes but to be improved require validation against observations. The direct observational record of extant ice sheets is limited to a few recent decades, but there is a large and growing body of geochronological evidence spanning millennia constraining the behaviour of palaeo-ice sheets. Hindcasts can be used to improve model formulations and study interactions between ice sheets, the climate system and landscape. However, ice-sheet modelling results have inherent quantitative errors stemming from parameter uncertainty and their internal dynamics, leading many modellers to perform ensemble simulations, while uncertainty in geochronological evidence necessitates expert interpretation. Quantitative tools are essential to examine which members of an ice-sheet model ensemble best fit the constraints provided by geochronological data. We present the Automated Timing Accordance Tool (ATAT version 1.1) used to quantify differences between model results and geochronological data on the timing of ice-sheet advance and/or retreat. To demonstrate its utility, we perform three simplified ice-sheet modelling experiments of the former British–Irish ice sheet. These illustrate how ATAT can be used to quantify model performance, either by using the discrete locations where the data originated together with dating constraints or by comparing model outputs with empirically derived reconstructions that have used these data along with wider expert knowledge. The ATAT code is made available and can be used by ice-sheet modellers to quantify the goodness of fit of hindcasts. ATAT may also be useful for highlighting data inconsistent with glaciological principles or reconstructions that cannot be replicated by an ice-sheet model.

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24

Kara, T. V., M. V. Luchitskaya, S. M. Katkov, and E. A. Belousova. "New U-Pb geochronological data on the age of volcanic-plutonic assemblage of Oloy belt, Alazey-Oloy fold system (West Chukotka)." Доклады Академии наук 487, no. 6 (September 10, 2019): 653–58. http://dx.doi.org/10.31857/s0869-56524876653-658.

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New U-Pb (SIMS and LA-ICP-MS) geochronological data for rocks of Egdygkych complex of hypabyssal intrusions, Nichan and Vukney plutons, and felsic volcanic rocks and tuffs from host strata of Oloy volcanic belt of Alasey-Oloy fold system are obtained. Concordant ages of Egdygkych complex rocks correspond to Early Cretaceous (Berriasian-Valanginian), those for host strata, to the end of Late Jurassic (Tithonian) - beginning of Early Cretaceous (Berriasian). New U-Pb geochronological data allow confidently to distinguish uniform volcanic-plutonic assemblage of Late Jurassic (Tithonian) - Early Cretaceous (Berriasian-Valanginian) age of Oloy volcanic belt. Obtained data more definitely determine age limits of Au-Mo-Cu mineralization, associated with contacts between rocks of Egdydkych complex and host volcanic-sedimentary rocks or contacts of separated intrusive phases.

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25

Candy, Ian, Stuart Black, and Bruce W. Sellwood. "U-series isochron dating of immature and mature calcretes as a basis for constructing Quaternary landform chronologies for the Sorbas basin, southeast Spain." Quaternary Research 64, no. 1 (July 2005): 100–111. http://dx.doi.org/10.1016/j.yqres.2005.05.002.

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AbstractImmature and mature calcretes from an alluvial terrace sequence in the Sorbas basin, southeast Spain, were dated by the U-series isochron technique. The immature horizons consistently produced statistically reliable ages of high precision. The mature horizons typically produced statistically unreliable ages but, because of linear trends in the dataset and low errors associated with each data point, it was still possible to place a best-fit isochron through the dataset to produce an age with low associated uncertainties. It is, however, only possible to prove that these statistically unreliable ages have geochronological significance if multiple isochron ages are produced for a single site, and if these multiple ages are stratigraphically consistent. The geochronological significance of such ages can be further proven if at least one of the multiple ages is statistically reliable. By using this technique to date calcretes that have formed during terrace aggradation and at the terrace surface after terrace abandonment it is possible not only to date the timing of terrace aggradation but also to constrain the age at which the river switched from aggradation to incision. This approach, therefore, constrains the timing of changes in fluvial processes more reliably than any currently used geochronological procedure and is appropriate for dating terrace sequences in dryland regions worldwide, wherever calcrete horizons are present.

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26

Frost, Carol D., and C. Mark Fanning. "Archean geochronological framework of the Bighorn Mountains, Wyoming." Canadian Journal of Earth Sciences 43, no. 10 (October 1, 2006): 1399–418. http://dx.doi.org/10.1139/e06-051.

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The Bighorn Mountains of the central Wyoming Province expose a large tract of Archean crust that has been tectonically inactive and at relatively high crustal levels since ~2.7 Ga. Seven sensitive high-resolution ion microprobe (SHRIMP) U–Pb zircon and titanite age determinations on samples of the main lithologic units provide a geochronological framework for the evolution of this area. The oldest, precisely dated magmatic event occurred at 2950 ± 5 Ma, when diorite to granite dykes and sills intruded an older gneiss complex exposed in the central and southern Bighorn Mountains. Rocks as old as 3.25 Ga may be present in this gneissic basement, as indicated by the oldest dates obtained on areas of zircon grains that are interpreted as inherited cores. A tonalitic gneiss was intruded into the gneiss complex at 2886 ± 5 Ma. Deformation of the central and southern gneisses preceded the intrusion of the Bighorn batholith, a tonalitic to granitic intrusion that occupies the northern portion of the uplift. This composite batholith was intruded over the period 2.86–2.84 Ga. Ca. 3.0–2.8 Ga crust is also present in the Beartooth Mountains, the Washakie block of the northeastern Wind River Range, the Owl Creek Mountains, and the northern Granite Mountains, but late Archean deformation and plutonism has obscured much of the earlier history in the southern portion of this area. The entire area, referred to as the Beartooth–Bighorn Magmatic Zone, has been undeformed since 2.6 Ga. Proterozoic extension was focused in those parts of the Wyoming Province outside of this domain.

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27

Kostyukevich, V. V. "A Regional Geochronological Study of Late Pleistocene Permafrost." Radiocarbon 35, no. 3 (1993): 477–86. http://dx.doi.org/10.1017/s0033822200060501.

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The use of radiocarbon dating in geocryological investigations makes it possible to establish a chronology for permafrost-geological development during the Late Pleistocene. Both global and regional time scales for the formation of Late Pleistocene permafrost have been worked out over the past 15–20 years at the Permafrost Institute of the Siberian Branch of the Russian Academy of Sciences. I present here results from study areas of northwestern Siberia and of North, Central and West Yakutia.

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28

Masuda, A., H. Shimizu, S. Nakai, A. Makishima, and S. Lahti. "138La β-decay constant estimated from geochronological studies." Earth and Planetary Science Letters 89, no. 3-4 (August 1988): 316–22. http://dx.doi.org/10.1016/0012-821x(88)90119-7.

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29

Guan, H., and M. Sun. "Geochronological constraints on formation of the Fuping Complex." Chinese Science Bulletin 43, S1 (August 1998): 48. http://dx.doi.org/10.1007/bf02891440.

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30

Lauritzen, Stein-Erik, John Erik Haugen, Reidar Løvlie, and Helge Gilje-Nielsen. "Geochronological Potential of Isoleucine Epimerization in Calcite Speleothems." Quaternary Research 41, no. 1 (January 1994): 52–58. http://dx.doi.org/10.1006/qres.1994.1006.

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AbstractThe extent of isoleucine epimerization in a calcite speleothem was determined to evaluate the amino acid racemization method in abiotic calcite. A 5.5-cm-thick flowstone slab from Hamarnesgrotta, northern Norway, was analyzed for amino acid concentration, composition, and isoleucine epimerization at 26 levels through the sequence. U-series dates provide an independent chronologic control. Epimerization increases monotonically with stratigraphic depth and linearily with U-series age, independent of amino acid concentrations. The rate of epimerization is calibrated against the U-series dates, and extrapolation into lower strata beyond the U-series limit yields absolute age estimates that are consistent with paleomagnetic data from the same speleothem. The results suggest that, if adequately calibrated, amino acid dating is applicable to speleothem material reaching time spans beyond the range of conventional dating methods. Amino acids in the speleothem were probably derived from surface soils and are associated with brown humic stains in the calcite.

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31

Gardés, Emmanuel, and Jean-Marc Montel. "Opening and resetting temperatures in heating geochronological systems." Contributions to Mineralogy and Petrology 158, no. 2 (January 31, 2009): 185–95. http://dx.doi.org/10.1007/s00410-009-0377-6.

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32

Ivakin, Y., and S. Potapichev. "ALGORITHM OF BIOGRAPHICAL HYPOTHESES TESTING BASED ON GEOCHRONOLOGICAL TRACKING." Telecom IT 7, no. 1 (2019): 60–74. http://dx.doi.org/10.31854/2307-1303-2019-7-1-60-74.

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Research subject. Information technology of the geochronological tracking is an assembly of processes that accumulate and integrate data about geographic relocation of historical figures for a given time interval and represent the results as a generalizing graph in GIS. Method. Hypotheses on the stable tendencies in migration could be represented as the above graph’s sub-graphs. Such tendencies testing would be reduced to the search and evaluation of the statistical significance for the matching graphs’ isomorphism. Full-featured development of computer interpretation of the graph theory methods based on geochronological tracking provides new quality of historical research using modern GIS-tools. Practical relevance. Namely, researcher can use the quantitative methods of the corresponding logical-analytical apparatus. The proposed paper deals with a consideration of qualitatively new possibilities of such an approach and the corresponding algorithmic apparatus.

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33

Zaika, V. A., A. A. Sorokin, V. P. Kovach, A. P. Sorokin, and A. B. Kotov. "Age and sources of the Lower Mesozoic metasedimentary rocks of the Un'ja-Bom terrane in the Mongol-Okhotsk fold belt: results of the U–Th–Pb geohronological (LA–ICP–MS) AND Sm–Nd isotope studies." Доклады Академии наук 484, no. 4 (May 5, 2019): 455–59. http://dx.doi.org/10.31857/s0869-56524844455-459.

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The results of the U—Th—Pb geochronological studies indicate that in the Un’ja-Bom terrane the youngest peaks on the relative probability curves of ages are 207 and 212 Ma for zircons from the metasiltstone of the Kurnal formation and from the metasiltstone of the Amkan formation. Similar age estimates for the youngest peaks were obtained for the detrital zircons from the metasedimentary rocks of the Tukuringra terrain of the eastern part of the Mongol-Okhotsk belt, which indicates that the Lower Mesozoic flyschoid complexes in the structure of this belt are developed much wider than is currently believed. The results obtained in our U—Th—Pb geochronological and Sm—Nd isotope geochemical studies suggest’s that the sedimentary rocks material was carried to the sedimentation basin mainly from the continental massifs of the Amur superterrane.

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34

Rains, Bruce, and James Welch. "Out-of-phase Holocene terraces in part of the North Saskatchewan River basin, Alberta." Canadian Journal of Earth Sciences 25, no. 3 (March 1, 1988): 454–64. http://dx.doi.org/10.1139/e88-046.

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This study focuses on alluvial terraces in part of the North Saskatchewan River valley, near Edmonton, and in the small tributary valleys of Whitemud and Strawberry creeks. The characteristic terrace morphologies and alluvial sediment sequences are briefly described, but most importantly, the deposits are radiocarbon dated for many sites. Twenty-seven new 14C dates on bone, wood, charcoal, and shell materials, along with previously reported dates, provide the chronological framework for the study. Occurrences of the Mazama ash marker bed in terrace alluvium offer additional geochronological evidence. The small tributary valleys have clearly developed in an out-of-phase manner relative to the main river valley, which acts as their local base level. Despite the comparatively abundant geochronological evidence described here, the explanation of alluvial terrace development, in terms of predominant causal factors, remains tantalizingly elusive.

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35

Suckow, Axel, Uwe Morgenstern, and Herrmann-Rudolf Kudrass. "Absolute Dating of Recent Sediments in the Cyclone-influenced Shelf Area Off Bangladesh: Comparison of Gamma Spectrometric (137Cs, 210Pb, 228Ra), Radiocarbon, and 32Si Ages." Radiocarbon 43, no. 2B (2001): 917–27. http://dx.doi.org/10.1017/s0033822200041588.

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A geochronological survey of the Bengal shelf area involved results from more than 20 sediment cores dated using gamma spectrometry and the nuclides 137Cs, 228Ra, 226Ra, and 210Pb. In some cores, which contained older sediments, 32Si and 14C were determined to examine the possibility to extrapolate the obtained chronologies to century and millennial scale. Geochronological work in this region is faced with problems of cyclone-induced sediment reworking, grain-size effects on fallout nuclides, scarcity of carbonates, unknown 14C reservoir effect and sedimentation rates that are too high to obtain sediment cores long enough to establish a chronology. Despite these problems, comparison between the results of the different dating methods provided the most reliable sediment balance to date for the submarine delta of the Ganges-Brahmaputra river system and indicated that on a time scale of several centuries at least 35% of the annual sediment load is deposited.

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36

Welin, Eric. "Geochronological overview of Bergslagen and adjacent areas, central Sweden." Geologiska Föreningen i Stockholm Förhandlingar 112, no. 2 (June 1990): 206. http://dx.doi.org/10.1080/11035899009453199.

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37

Nitkina, E. A., and T. B. Bayanova. "Isotope-geochronological study of Ingozero massive (the Kola Peninsula)." Vestnik MGTU 21, no. 1 (2018): 51–60. http://dx.doi.org/10.21443/1560-9278-2018-21-1-51-60.

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38

Barrett, P. J., C. J. Adams, W. C. Mclntosh, C. C. Swisher, and G. S. Wilson. "Geochronological evidence supporting Antarctic deglaciation three million years ago." Nature 359, no. 6398 (October 1992): 816–18. http://dx.doi.org/10.1038/359816a0.

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39

Wyborn, L. A. I., R. W. Page, and A. J. Parker. "Geochemical and Geochronological Signatures in Australian Proterozoic Igneous Rocks." Geological Society, London, Special Publications 33, no. 1 (1987): 377–94. http://dx.doi.org/10.1144/gsl.sp.1987.033.01.26.

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40

Schaaf, Peter, Dante Morán-Zenteno, Maria del Sol Hernández-Bernal, Gabriela Solís-Pichardo, Gustavo Tolson, and Hermann Köhler. "Paleogene continental margin truncation in southwestern Mexico: Geochronological evidence." Tectonics 14, no. 6 (December 1995): 1339–50. http://dx.doi.org/10.1029/95tc01928.

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41

Cahen, L. "REVIEW OF GEOCHRONOLOGICAL KNOWLEDGE IN MIDDLE AND NORTHERN AFRICA." Annals of the New York Academy of Sciences 91, no. 2 (December 15, 2006): 535–66. http://dx.doi.org/10.1111/j.1749-6632.1961.tb35519.x.

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42

Bourlès, D. L., G. Klinkhammer, A. C. Campbell, C. I. Measures, E. T. Brown, and J. M. Edmond. "Beryllium in marine pore waters: geochemical and geochronological implications." Nature 341, no. 6244 (October 1989): 731–33. http://dx.doi.org/10.1038/341731a0.

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43

Dragusanu, C., and T. Tanaka. "Geochronological evolution of prealpine basement in the South Carpathians." Chinese Science Bulletin 43, S1 (August 1998): 34. http://dx.doi.org/10.1007/bf02891414.

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Pystina, Yu I. "Geochronological reconstruction of the polymetamorphic complexes of the Urals." Chinese Science Bulletin 43, S1 (August 1998): 106. http://dx.doi.org/10.1007/bf02891554.

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45

Yang, Chuan, Xian-Hua Li, Maoyan Zhu, Daniel J. Condon, and Junyuan Chen. "Geochronological constraint on the Cambrian Chengjiang biota, South China." Journal of the Geological Society 175, no. 4 (March 15, 2018): 659–66. http://dx.doi.org/10.1144/jgs2017-103.

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46

Sarkar, A., A. K. Datta, B. C. Poddar, B. K. Bhattacharyya, V. K. Kollapuri, and R. Sanwal. "Geochronological studies of Mesozoic igneous rocks from eastern India." Journal of Southeast Asian Earth Sciences 13, no. 2 (February 1996): 77–81. http://dx.doi.org/10.1016/0743-9547(96)00009-8.

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47

Garrison, Ervan G. "Characterization of an ESR geochronological dating center in flints." Physics and Chemistry of Minerals 16, no. 8 (November 1989): 767–73. http://dx.doi.org/10.1007/bf00209700.

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48

von Quadt, A. "The Saxonian Granulite Massif: new aspects from geochronological studies." Geologische Rundschau 82, no. 3 (September 1993): 516–30. http://dx.doi.org/10.1007/bf00212414.

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49

Carmo, Isabela de O., and Paulo Vasconcelos. "Geochronological evidence for pervasive Miocene weathering, Minas Gerais, Brazil." Earth Surface Processes and Landforms 29, no. 11 (2004): 1303–20. http://dx.doi.org/10.1002/esp.1090.

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50

Bhattacharya, S., R. Kar, A. K. Saw, and P. Das. "Relative chronology in high-grade crystalline terrain of the Eastern Ghats, India: new insights." Solid Earth Discussions 3, no. 1 (January 17, 2011): 1–17. http://dx.doi.org/10.5194/sed-3-1-2011.

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Abstract. The two major lithology or gneiss components in the polycyclic granulite terrain of the Eastern Ghats, India, are the supracrustal rocks, commonly described as khondalites, and the charnockite-gneiss. Many of the workers considered the khondalites as the oldest component with unknown basement and the charnockite-protoliths as intrusive into the khondalites. However, geochronological data do not corroborate the aforesaid relations. The field relations of the hornblende- mafic granulite with the two gneiss components together with geocronological data indicate that khondalite sediments were deposited on older mafic crustal rocks. We propose a different scenario: Mafic basement and supracrustal rocks were subsequently deformed and metamorphosed together at high to ultra-high temperatures – partial melting of mafic rocks producing the charnockitic melt; and partial melting of pelitic sediments producing the peraluminous granitoids. This is compatible with all the geochronological data as well as the petrogenetic model of partial melting for the charnockitic rocks in the Eastern Ghats Belt.

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