Fission-Track Analysis: Field Collection, Sample Preparation and Data Acquisition

Kohn, Barry P.; Chung, Ling; Gleadow, Andrew

doi:10.1007/978-3-319-89421-8_2

Cited by 44 publications

(25 citation statements)

References 94 publications

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“…Recent re-views of fission track analysis and its application in the Earth sciences are provided by Malusà and Fitzgerald (2019) and articles therein. This technique, based on the identification of damage trails in crystals and glasses induced by the spontaneous fission of 238 U in the sample and their density (e.g., Kohn et al, 2019), has been applied to impact lithologies ever since their discovery (e.g., Gentner et al, 1967Gentner et al, , 1969Koeberl et al, 1993;McHone and Sorkhabi, 1994;Weber et al, 2005). In the case of the 1.13 km-diameter Tswaing impact crater in South Africa, a fission track age of 220 -104 ka for impact glass (Storzer et al, 1999) is preferred over a very poorly constrained stratigraphic age (<2.05 Ga) and Ar-Ar results that are disturbed toward more ancient apparent ages due to the presence of inherited 40 Ar* sourced from the Paleoproterozoic granitic target rock ( Jourdan et al, 2007).…”

Section: Other Agesmentioning

confidence: 99%

Earth's Impact Events Through Geologic Time: A List of Recommended Ages for Terrestrial Impact Structures and Deposits

2020

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This article presents a current (as of September 2019) list of recommended ages for proven terrestrial impact structures (n = 200) and deposits (n = 46) sourced from the primary literature. High-precision impact ages can be used to (1) reconstruct and quantify the impact flux in the inner Solar System and, in particular, the Earth-Moon system, thereby placing constraints on the delivery of extraterrestrial mass accreted on Earth through geologic time; (2) utilize impact ejecta as event markers in the stratigraphic record and to refine bio-and magnetostratigraphy; (3) test models and hypotheses of synchronous double or multiple impact events in the terrestrial record; (4) assess the potential link between large impacts, mass extinctions, and diversification events in the biosphere; and (5) constrain the duration of melt sheet crystallization in large impact basins and the lifetime of hydrothermal systems in cooling impact craters, which may have served as habitats for microbial life on the early Earth and, possibly, Mars.

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Section: Other Agesmentioning

confidence: 99%

Earth's Impact Events Through Geologic Time: A List of Recommended Ages for Terrestrial Impact Structures and Deposits

2020

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“…Often, ηE is taken to be the fraction of tracks counted (Hasebe et al 2004;Tagami and O'Sullivan 2005). Equation 1is the basis for counting tracks in slow-etching surfaces characterized by sharp polishing scratches, e.g., apatite prism faces (Gleadow 1978;1981;Kohn et al 2019). Mica cleavage planes are also thought to have near-unit efficiencies.…”

Section: Introductionmentioning

confidence: 99%

A quantitative description of fission-track etching in apatite

Aslanian

Jonckheere

Wauschkuhn

et al. 2021

American Mineralogist

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We measured the apatite etch rate vR in 5.5 M HNO3 at 21 °C as a function of orientation. Results for Durango apatite evidence that vR varies by a factor >5 with angle to the c-axis. Our measurements also provided track etch rates vT and surface etch rates vS. However, these cannot be combined for calculating track etching or counting efficiencies. By inserting the measured etch rates in a recent model, we calculate the geometries and dimensions of surface tracks in different apatite faces. The proposed model must be recalibrated for different etching protocols and adapted for other minerals. We submit that the new model justifies reviewing track counting efficiencies based on the existing (vB-vT) etch model. We anticipate that this will have an effect on practical aspects of fission track dating. Single-track step-etch data show that the confined track lengths increase with etch time at a decreasing average rate vL that differs from the track etch rate vT and the apatite etch rate vR. Both vT and vL exhibit large track-to-track differences that produce irreducible length variation related to the latent-track structure resulting from formation and annealing. Step etching and track width measurements are effective for reducing or eliminating procedure-related artifacts from track length data, and so for accessing more fundamental track properties.

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“…Apatite and zircon crystals were separated from crushed rocks by heavy liquid and magnetic separation techniques following the procedure described by Kohn et al (). Apatite grains were mounted in epoxy resin and etched with 5.5 M HNO 3 for 20 s at ~21 °C at the ISTerre fission track laboratory ( Université Grenoble Alpes ) in order to reveal spontaneous tracks.…”

Section: Sampling Strategy and Methodologymentioning

confidence: 99%

Unraveling the Mesozoic and Cenozoic Tectonothermal Evolution of the Eastern Basque‐Cantabrian Zone–Western Pyrenees by Low‐Temperature Thermochronology

et al. 2019

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Low‐temperature thermochronology studies have increased our knowledge of the orogenic processes along the Pyrenean‐Cantabrian mountain belt by placing time constraints on the exhumation history of its rocks. However, a significant gap in the data existed between the western Pyrenees and the central Cantabrian Mountains, hampering a comprehensive view of the tectonothermal evolution along the belt. We present a new apatite fission track and zircon (U‐Th)/He (ZHe) data set for the eastern Basque‐Cantabrian zone–western Pyrenees. Apatite fission track central ages cluster in the Eocene‐Oligocene. ZHe samples can be separated into two groups: Group 1 depicts clustered ZHe ages‐eU concentration (Cinco Villas massif) and Group 2 depicts dispersed ZHe ages‐eU concentration (Alduides massif and a Paleozoic rock pinned along the Leiza thrust). A sample from the Oroz‐Betelu massif shows intermediate behavior. Inverse modeling suggests that samples from Group 1 reached 240–280 °C in the Late Cretaceous, implying deep sedimentary burial of the Cinco Villas massif before its major exhumation phase, most probably in the early to middle Eocene, postdating the phase of rapid exhumation of the western part of the Leiza thrust. The sample from the Oroz‐Betelu massif, far from the Mesozoic exhumed mantle domain, experienced maximum temperatures close to 200 °C by burial beneath the Jaca‐Pamplona basin. It was later exhumed in the hanging wall of the Gavarnie thrust in the Bartonian‐Priabonian. This work provides new insights into the tectonothermal evolution of the Basque massifs and the inversion of a hyperextended margin.

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Fission-Track Analysis: Field Collection, Sample Preparation and Data Acquisition

Cited by 44 publications

References 94 publications

Earth's Impact Events Through Geologic Time: A List of Recommended Ages for Terrestrial Impact Structures and Deposits

Earth's Impact Events Through Geologic Time: A List of Recommended Ages for Terrestrial Impact Structures and Deposits

A quantitative description of fission-track etching in apatite

Unraveling the Mesozoic and Cenozoic Tectonothermal Evolution of the Eastern Basque‐Cantabrian Zone–Western Pyrenees by Low‐Temperature Thermochronology

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