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  • 1
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    Online Resource
    Cation-Ratio and Accelerator Radiocarbon Dating of Rock Varnish on Mojave Artifacts and Landforms
    American Association for the Advancement of Science (AAAS) ; 1986
    In:  Science Vol. 231, No. 4740 ( 1986-02-21), p. 830-833
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 231, No. 4740 ( 1986-02-21), p. 830-833
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.231.4740.830
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 1986
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  • 2
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    Mineralogy, petrology, chronology, and exposure history of the Chelyabinsk meteorite and parent body
    Wiley ; 2015
    In:  Meteoritics & Planetary Science Vol. 50, No. 10 ( 2015-10), p. 1790-1819
    Details
    In: Meteoritics & Planetary Science, Wiley, Vol. 50, No. 10 ( 2015-10), p. 1790-1819
    Abstract: Three masses of the Chelyabinsk meteorite have been studied with a wide range of analytical techniques to understand the mineralogical variation and thermal history of the Chelyabinsk parent body. The samples exhibit little to no postentry oxidation via Mössbauer and Raman spectroscopy indicating their fresh character, but despite the rapid collection and care of handling some low levels of terrestrial contamination did nonetheless result. Detailed studies show three distinct lithologies, indicative of a genomict breccia. A light‐colored lithology is LL 5 material that has experienced thermal metamorphism and subsequent shock at levels near S4. The second lithology is a shock‐darkened LL 5 material in which the darkening is caused by melt and metal‐troilite veins along grain boundaries. The third lithology is an impact melt breccia that formed at high temperatures (~1600 °C), and it experienced rapid cooling and degassing of S 2 gas. Portions of light and dark lithologies from Chel‐101, and the impact melt breccias (Chel‐102 and Chel‐103) were prepared and analyzed for Rb‐Sr, Sm‐Nd, and Ar‐Ar dating. When combined with results from other studies and chronometers, at least eight impact events (e.g., ~4.53 Ga, ~4.45 Ga, ~3.73 Ga, ~2.81 Ga, ~1.46 Ga, ~852 Ma, ~312 Ma, and ~27 Ma) are clearly identified for Chelyabinsk, indicating a complex history of impacts and heating events. Finally, noble gases yield young cosmic ray exposure ages, near 1 Ma. These young ages, together with the absence of measurable cosmogenic derived Sm and Cr, indicate that Chelyabinsk may have been derived from a recent breakup event on an NEO of LL chondrite composition.
    Type of Medium: Online Resource
    ISSN: 1086-9379 , 1945-5100
    URL: Issue
    URL: Article
    DOI: 10.1111/maps.2015.50.issue-10
    DOI: 10.1111/maps.12511
    Language: English
    Publisher: Wiley
    Publication Date: 2015
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  • 3
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    Owyhee River intracanyon lava flows: Does the river give a dam?
    Geological Society of America ; 2012
    In:  Geological Society of America Bulletin Vol. 124, No. 11-12 ( 2012-11-01), p. 1667-1687
    Details
    In: Geological Society of America Bulletin, Geological Society of America, Vol. 124, No. 11-12 ( 2012-11-01), p. 1667-1687
    Type of Medium: Online Resource
    ISSN: 0016-7606 , 1943-2674
    URL: Article
    URL: Article
    DOI: 10.1130/B30574.1
    DOI: 10.1130/2012321
    Language: English
    Publisher: Geological Society of America
    Publication Date: 2012
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  • 4
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    40 Ar/ 39 Ar ages of Northwest Africa 7034 and Northwest Africa 7533
    Wiley ; 2021
    In:  Meteoritics & Planetary Science Vol. 56, No. 3 ( 2021-03), p. 515-545
    Details
    In: Meteoritics & Planetary Science, Wiley, Vol. 56, No. 3 ( 2021-03), p. 515-545
    Abstract: The Martian breccias NWA 7034, NWA 7533, and paired meteorites record events ranging in age from 4.47 Ga to 〈 200 Ma. Published ages indicate a period of major disturbance at ~1.4 Ga, examined in detail here through 40 Ar/ 39 Ar dating of handpicked grains and two small chips. Argon diffusion parameters were obtained for six samples. Also presented are He, Ne, Ar, Kr, and Xe contents of two small ( 〈 100 µg), handpicked mineral separates, a felsic “Light” sample and a mafic/pyroxene‐rich “Dark” sample. The 40 Ar/ 39 Ar ages of five samples, four containing 〉 1 wt% K and thought to be rich in feldspar and one containing 〈 ~1 wt% K, cluster near 1.4 Ga. The 40 Ar/ 39 Ar ages of nine grains with low K contents have a wide range of apparent ages from 0.3 ± 0.1 Ga to 2.9 ± 0.1 Ga for individual temperature steps, and from 0.74 ± 0.06 Ga to ~2.1 Ga for plateau ages. Isochron ages are less precise, but generally agree with plateau ages. Only two isochrons have the significantly positive intercepts expected in the presence of terrestrial or Martian atmospheric argon. At higher release temperatures, activation energies for diffusion obtained from 39 Ar data for six samples are generally 160–200 kJ mol −1 , consistent with published values for feldspathic minerals. For three of these samples, lower temperature data on Arrhenius plots are best fit with a much lower activation energy of 〈 100 kJ mol −1 . We attribute the low values to the effects of varying degrees of shock on feldspathic minerals and/or the presence of phases in vitrophyric spherules produced by hydrothermal alteration. The low activation energies place an upper limit of ~14 ka on the terrestrial age of NWA 7034. Much lower concentrations of cosmogenic (c) 3 He and 21 Ne in the Light than in the Dark separate indicate substantial losses concurrent with or postdating cosmic ray irradiation. A one‐stage, cosmic ray exposure (CRE) age for the Dark separate from NWA 7034 is estimated to be between 7 and 10 Ma from the concentrations of 3 He c and 38 Ar c , and of close to 15 Ma from the concentration of 21 Ne c . Most of the 40 Ar/ 39 Ar and noble gas data are compatible with (1) a heating and alteration event ~1.40 Ga caused by contact metamorphism, an impact, and/or the infiltration of hydrothermal fluids; and (2) at least one later event at lower temperatures that led to either loss of He and Ar from phases with low activation energies, or to gain of K. Most of the 40 Ar/ 39 Ar ages are consistent with the assembly of NWA 7034 1.4 Ga ago or perhaps earlier followed more recently by selective alteration. A more recent time of assembly is also consistent with these ages provided that the temperature stayed low. The five most precise 40 Ar/ 39 Ar ages of the samples analyzed are all ~1.4 Ga, a value seen frequently in other NWA 7034 chronometers and very similar to crystallization ages of nakhlites and chassignites (NC). Some CRE ages based on noble gases in NWA 7034 agree within their considerable uncertainties with those of NC. These two chronometric coincidences suggest that the NWA 7034 clan and the NC share a launch date on Mars. We propose that K‐rich fluids derived from the nakhlite source area interacted with proto‐NWA 7034 and modified the K/Ar ratios and ages of previously shocked feldspar grains, with the degree of modification depending on the degree of shock. The NWA 7034 clan may therefore be considered components from a metamorphic aureole around a nakhlite massif.
    Type of Medium: Online Resource
    ISSN: 1086-9379 , 1945-5100
    URL: Issue
    URL: Article
    DOI: 10.1111/maps.v56.3
    DOI: 10.1111/maps.13637
    Language: English
    Publisher: Wiley
    Publication Date: 2021
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  • 5
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    Age and character of basaltic rocks of the Yucca Mountain region, southern Nevada
    American Geophysical Union (AGU) ; 1996
    In:  Journal of Geophysical Research: Solid Earth Vol. 101, No. B4 ( 1996-04-10), p. 8205-8227
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 101, No. B4 ( 1996-04-10), p. 8205-8227
    Abstract: Volcanism in the Yucca Mountain region of southern Nevada in the last 5 m.y. is restricted to moderate‐to‐small volumes of subalkaline basaltic magmas, produced during at least 6 intervals, and spanning an age range from 4.6 Ma to about 125 ka. Where paleomagnetic evidence is available, the period of volcanism at individual eruptive centers apparently was geologically short‐lived, even where multiple eruptions involved different magma types. K‐Ar studies are consistent with most other geochronologic information, such as the minimum ages of exposure‐dating techniques, and show no evidence of renewed volcanism after a significant quiescence at any of the centers in the Yucca Mountain region. A volcanic recurrence interval of 860 ± 350 kyr is computed from a large K‐Ar data set and an evaluation of their uncertainties. Monte Carlo error propagations demonstrate the validity of uncertainties obtained for weighted‐mean ages when modified using the goodness of fit parameter, MSWD. Elevated 87 Sr/ 86 Sr initial ratios (Sr i ) in the basalts, nearly constant at 0.707, combined with low SiO 2 and Rb/Sr ratios indicate a subcontinental, lithospheric mantle source, previously enriched in radiogenic Sr and depleted in Rb. Beginning with eruptions of the most voluminous eruptive center, the newly dated Pliocene Thirsty Mountain volcano, basaltic magmas have decreased in eruptive volume, plagioclase‐phenocryst content, various trace element ratios, and TiO 2 , while increasing in light rare earth elements, U, Th, P 2 O 5 , and light REE/heavy REE ratios. These time‐correlated changes are consistent with either increasing depths of melting or a decreasing thermal gradient in the Yucca Mountain region during the last 5 m.y.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/95JB03123
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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  • 6
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    The 40 Ar/ 39 Ar and K/Ar dating of lavas from the Hilo 1‐km core hole, Hawaii Scientific Drilling Project
    American Geophysical Union (AGU) ; 1996
    In:  Journal of Geophysical Research: Solid Earth Vol. 101, No. B5 ( 1996-05-10), p. 11607-11616
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 101, No. B5 ( 1996-05-10), p. 11607-11616
    Abstract: Mauna Kea lava flows cored in the Hilo hole range in age from 〈 200 ka to about 400 ka based on 40 Ar/ 39 Ar incremental heating and K‐Ar analyses of 16 groundmass samples and one coexisting plagioclase. The lavas, all subaerially deposited, include a lower section consisting only of tholeiitic basalts and an upper section of interbedded alkalic, transitional tholeiitic, and tholeiitic basalts. The lower section has yielded predominantly complex, discordant 40 Ar/ 39 Ar age spectra that result from mobility of 40 Ar and perhaps K, the presence of excess 40 Ar, and redistribution of 39 Ar by recoil. Comparison of K‐Ar ages with 40 Ar/ 39 Ar integrated ages indicates that some of these samples have also lost 39 Ar. Nevertheless, two plateau ages of 391 ± 40 and 400 ± 26 ka from deep in the hole, combined with data from the upper section, show that the tholeiitic section accumulated at an average rate of about 7 to 8 m/kyr and has a mean recurrence interval of 0.5 kyr/flow unit. Samples from the upper section yield relatively precise 40 Ar/ 39 Ar plateau and isotope correlation ages of 326 ± 23, 241 ± 5, 232 ± 4, and 199 ± 9 ka for depths of −415.7 m to −299.2 m. Within their uncertainty, these ages define a linear relationship with depth, with an average accumulation rate of 0.9 m/kyr and an average recurrence interval of 4.8 kyr/flow unit. The top of the Mauna Kea sequence at −280 m must be older than the plateau age of 132 ± 32 ka, obtained for the basal Mauna Loa flow in the corehole. The upward decrease in lava accumulation rate is a consequence of the decreasing magma supply available to Mauna Kea as it rode the Pacific plate away from its magma source, the Hawaiian mantle plume. The age‐depth relation in the core hole may be used to test and refine models that relate the growth of Mauna Kea to the thermal and compositional structure of the mantle plume.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/95JB03702
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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  • 7
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    Brunhes chron excursion/polarity episode recorded during the late pleistocene, Albuquerque Volcanoes, New Mexico, USA
    Oxford University Press (OUP) ; 1990
    In:  Geophysical Journal International Vol. 102, No. 1 ( 1990-07), p. 73-88
    Details
    In: Geophysical Journal International, Oxford University Press (OUP), Vol. 102, No. 1 ( 1990-07), p. 73-88
    Type of Medium: Online Resource
    ISSN: 0956-540X , 1365-246X
    URL: Issue
    URL: Article
    DOI: 10.1111/gji.1990.102.issue-1
    DOI: 10.1111/j.1365-246X.1990.tb00531.x
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 1990
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  • 8
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    Age and correlation of a paleomagnetic episode in the western United States by 40 Ar/ 39 Ar dating and tephrochronology: The Jamaica, Blake, or a new polarity episode?
    American Geophysical Union (AGU) ; 1994
    In:  Journal of Geophysical Research: Solid Earth Vol. 99, No. B12 ( 1994-12-10), p. 24091-24103
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 99, No. B12 ( 1994-12-10), p. 24091-24103
    Abstract: High‐resolution paleomagnetic records from two sites near Pringle Falls, Oregon, are compared with similar records from Summer Lake, Oregon, ∼170 km to the southeast: Paoha Island, in Mono Lake, ∼660 km to the southeast and Benton Crossing, in Long Valley, approximately 700 km to the southeast, in east‐central California. The sequences at Pringle Falls contain a distinctive coarse pumice‐lapilli tephra layer which we have dated as 218±10 ka by 40 Ar/ 39 Ar step‐heating of plagioclase feldspar. Stratigraphically, this tephra is closely associated with a suite of several other tephra layers that bracket the interval studied paleomagnetically. Each tephra layer is distinguished by the unique chemical composition of its volcanic glass shards. The pumice layer dated at Pringle Falls is correlated with layers at three of the other localities. Using all the tephra layers, we can correlate the lake stratigraphic sequences and associated paleomagnetic records among the four distant localities. Additional age control is obtained from a fifth locality at Tulelake in northern California, where the stratigraphic interval of interest is bracketed between ∼171±43 and approximately 140 ka. Characteristics of the paleomagnetic records indicate virtually identical paleofield variation, particularly the geometry of a normal to normal (N‐N) geomagnetic polarity episode. The observed paleofield behavior resembles the Blake geomagnetic polarity episode, but is significantly older than the generally accepted age of the Blake episode. Either the age of the Blake episode is significantly underestimated, or the polarity episode documented here is older, perhaps the Jamaica episode, or is an as yet unreported episode. A corollary of the latter option is that paleomagnetic polarity episodes of different ages may have similar transition polar paths, a conclusion implying that a common mechanism is involved.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JB01546
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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  • 9
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    Petrology of Lower Crustal and Upper Mantle Xenoliths from the Cima Volcanic Field, California
    Oxford University Press (OUP) ; 1991
    In:  Journal of Petrology Vol. 32, No. 1 ( 1991-02-01), p. 169-200
    Details
    In: Journal of Petrology, Oxford University Press (OUP), Vol. 32, No. 1 ( 1991-02-01), p. 169-200
    Type of Medium: Online Resource
    ISSN: 0022-3530 , 1460-2415
    URL: Article
    DOI: 10.1093/petrology/32.1.169
    RVK:
    RB 10121
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 1991
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  • 10
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    Relationship between hyponatremia at hospital admission and cardiopulmonary profile at follow-up in patients with SARS-CoV-2 (COVID-19) infection
    Springer Science and Business Media LLC ; 2022
    In:  Journal of Endocrinological Investigation Vol. 46, No. 3 ( 2022-10-25), p. 577-586
    Details
    In: Journal of Endocrinological Investigation, Springer Science and Business Media LLC, Vol. 46, No. 3 ( 2022-10-25), p. 577-586
    Abstract: Hyponatremia occurs in about 30% of patients with pneumonia, including those with SARS-CoV-2 (COVID-19) infection. Hyponatremia predicts a worse outcome in several pathologic conditions and in COVID-19 has been associated with a higher risk of non-invasive ventilation, ICU transfer and death. The main objective of this study was to determine whether early hyponatremia is also a predictor of long-term sequelae at follow-up. Methods In this observational study, we collected 6-month follow-up data from 189 laboratory-confirmed COVID-19 patients previously admitted to a University Hospital. About 25% of the patients ( n  = 47) had hyponatremia at the time of hospital admission. Results Serum [Na + ] was significantly increased in the whole group of 189 patients at 6 months, compared to the value at hospital admission (141.4 ± 2.2 vs 137 ± 3.5 mEq/L, p   〈  0.001). In addition, IL-6 levels decreased and the PaO 2 /FiO 2 increased. Accordingly, pulmonary involvement, evaluated at the chest X-ray by the RALE score, decreased. However, in patients with hyponatremia at hospital admission, higher levels of LDH, fibrinogen, troponin T and NT-ProBNP were detected at follow-up, compared to patients with normonatremia at admission. In addition, hyponatremia at admission was associated with worse echocardiography parameters related to right ventricular function, together with a higher RALE score. Conclusion These results suggest that early hyponatremia in COVID-19 patients is associated with the presence of laboratory and imaging parameters indicating a greater pulmonary and right-sided heart involvement at follow-up.
    Type of Medium: Online Resource
    ISSN: 1720-8386
    URL: Article
    DOI: 10.1007/s40618-022-01938-9
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
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