Jump to navigation. Science Support Program. Search form Search. Chlorine Chlorine In situ cosmogenic 36 Cl is produced by interaction of cosmic rays with different target elements, mainly calcium, potassium and chlorine 35 Cl. We try to avoid rocks with high chlorine concentrations because of the complex 36 Cl production mechanism from chlorine, and we therefore focus on mineral separates rather than whole silicate rocks.
Canadian Journal of Earth Sciences
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Velebit Mt. (Croatia): insights from cosmogenic 36Cl dating of Rujanska Kosa Croatian Dinarides, up to date there are no quantitative glacial chronological.
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Combining Surface Weathering Analyses and Cosmogenic 36Cl Dating on the Pisia Fault Plane (Eastern Gulf of Corinth) to Reveal the Holocene Earthquake.
Go back. Overview Organisations People Publications Outcomes. Abstract Funding details. Publications The following are buttons which change the sort order, pressing the active button will toggle the sort order Author Name descending press to sort ascending. Beck J Bayesian earthquake dating and seismic hazard assessment using chlorine measurements BED v1. Cowie P Viscous roots of active seismogenic faults revealed by geologic slip rate variations in Nature Geoscience. Faure Walker J Relationship between topography, rates of extension and mantle dynamics in the actively-extending Italian Apennines in Earth and Planetary Science Letters.
Mildon Z Active normal faulting during the seismic sequence in Colfiorito, Umbria: Did slip propagate to the surface? Roberts G The implications of revised Quaternary palaeoshoreline chronologies for the rates of active extension and uplift in the upper plate of subduction zones in Quaternary Science Reviews.
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Chlorine has two stable isotopes and one cosmogenic isotope. The cosmogenic isotope, 36 Cl, has a long half-life, making it useful in age dating groundwaters up to 1 million years old. There is also limited variation in 37 Cl. Most natural variation in 37 Cl values in hydrologic systems are related to diffusion processes.
Abstract. Over the past 20 years, analyzing the abundance of the isotope chlorine (36Cl) has emerged as a popular tool for geologic dating.
The paper for the first time focuses on the fundamental geocryological goal – direct determining of permafrost agewith implications in many fields of geo- and bioscience. In general, the duration of the permafrost existence does notcoincide with the age of the sediments. Therefore, a cross-section of the cryolithosphere except the syngeneticallyfrozen layers, that were frozen upon deposition and never had thawed represents a sequence with known age of thesediments and with permafrost age, which is unknown or different to the sediment ages.
Theoretically, the problem could be solved using the approach of nuclear physics. We present a method of permafrostdating with the cosmogenic radionuclides 36Cl and 10Be in ice as a natural chronometer. The principal advantage ofthe proposed dating method for permafrost studies is based on the determination of the time of 36Cl and 10Be fixationthat corresponds to the age of the ice. As the first application, ice wedges are dated. As signals, the 36Cl and 10Beratios are used. Stable chlorine enters the atmosphere from the oceans and is containedin the precipitations.
The ratio does not depend on chloride concentrations in precipitations and on sublimation ofsnow. In-situ production of 36Cl in ice via neutron capture reactions on chlorine and of 10Be via cosmic ray inducedreactions on oxygen are calculated. Preliminary analysis of the results supports feasibility of the permafrost dating.
Using cosmogenic 36Cl dating, the timing and slip of paleoearthquakes are recoverable beyond the available earthquake ar- chives. One of the appropriate.
All documents in ORBi are protected by a user license. O pen R epository and Bi bliography. You are here: ORBi Detailled reference. On Bonaire Leeward Antilles, Caribbean , these deposits form prominent landforms, and transport by one or several Holocene tsunamis is assumed at least for the largest clasts. Although a large dataset of 14C and electron spin resonance ESR ages is available for major coral rubble ridges and ramparts, it is still debated whether these data reflect the timing of major events, and how these datasets are biased by the reworking of coral fragments.
Approaches ii and iii have never been applied to coastal boulder deposits so far. The three 14C age estimates are older than 40 ka, i. The microbialite sample yields an age of 1. Four coral samples collected from the topside of overturned boulders yielded similar 36Cl concentration measurements. However, the computed ages are affected by large uncertainties, mostly due to the high natural chlorine concentration. After correction for the inherited component and chemical denudation since platform emergence inducing additional uncertainty , the calculated 36Cl ages cluster between 2.
Method for chlorine-36 dating of halite
The 36 Cl content of the groundwater is assumed to be completely of atmospheric origin. This is a preview of subscription content, log in to check access. Rent this article via DeepDyve. Allen RJ Climate. Occasional publications 6, Royal Society of South Australia, pp 81— Water Resour Res 29 6 —
to radiometric dating. Accelerator mass spectrometry. A remarkable improvement in radiometric instrumentation was proposed in.
Cosmogenic 36 Cl ages were determined on 11 glacial erratics from the summits of Porcupine Hills and Cloudy Ridge, Waterton valley, and the Foothills south of Cardston, Alberta. They were laid down by 1 the most extensive advance of a Canadian Shield centred continental ice sheet into this region stratigraphically oldest glacial deposits ; 2 a montane glacial advance from the Waterton valley stratigraphically intermediate glacial deposits ; and 3 an advance of continental glacial ice that overrode deposits of the intermediate-age montane advance.
Zero erosion rate 36 Cl ages of the erratics, uncorrected for snow cover, range between about 12 and 18 ka. They support the hypothesis that the Laurentide Ice Sheet reached farther into the southwestern Foothills than did all the previous continental ice sheets. Laurence D. Advanced Search. All Journals Journal. Canadian Journal of Earth Sciences. Cited by View all 32 citing articles Evidence for Early Pleistocene glaciation from borecore stratigraphy in north-central Alberta, Canada.
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