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  • 1
    Keywords: Ar/Ar; absolute age; geochronology
    Description / Table of Contents: Introduction --- Advances in 40Ar/39Ar dating: from archaeology to planetary sciences – introduction / Fred Jourdan, Darren F. Mark and Chrystele Verati / Geological Society, London, Special Publications, 378, 1-8, 16 January 2014, https://doi.org/10.1144/SP378.24 --- Perspectives on 40Ar/39Ar dating / Ian McDougall / Geological Society, London, Special Publications, 378, 9-20, 30 September 2013, https://doi.org/10.1144/SP378.20 --- Methodological developments --- Some footnotes to the optimization-based calibration of the 40Ar/39Ar system / Paul R. Renne / Geological Society, London, Special Publications, 378, 21-31, 25 July 2013, https://doi.org/10.1144/SP378.17 --- Neutron-induced 37Ar recoil ejection in Ca-rich minerals and implications for 40Ar/39Ar dating / F. Jourdan and P. R. Renne / Geological Society, London, Special Publications, 378, 33-52, 25 July 2013, https://doi.org/10.1144/SP378.15 --- Direct measurement of recoil effects on 40Ar/39Ar standards / Chris M. Hall / Geological Society, London, Special Publications, 378, 53-62, 13 March 2013, https://doi.org/10.1144/SP378.7 --- FCs-EK: a new sampling of the Fish Canyon Tuff 40Ar/39Ar neutron flux monitor / L. E. Morgan, D. F. Mark, J. Imlach, D. Barfod and R. Dymock / Geological Society, London, Special Publications, 378, 63-67, 30 September 2013, https://doi.org/10.1144/SP378.21 --- Petrology and geochronology of ‘muscovite age standard’ B4M / Alexandra R. Heri, Martin Robyr and Igor M. Villa / Geological Society, London, Special Publications, 378, 69-78, 24 January 2013, https://doi.org/10.1144/SP378.2 --- Argon extraction from geological samples by CO2 scanning laser step-heating / D. N. Barfod, D. F. Mark, A. Tait, R. C. Dymock and J. Imlach / Geological Society, London, Special Publications, 378, 79-90, 24 October 2013, https://doi.org/10.1144/SP378.23 --- The multi-diffusion domain model: past, present and future / T. Mark Harrison and Oscar M. Lovera / Geological Society, London, Special Publications, 378, 91-106, 13 March 2013, https://doi.org/10.1144/SP378.9 --- Diffusion of Ar in K-feldspar: Present and absent / Igor M. Villa / Geological Society, London, Special Publications, 378, 107-116, 24 January 2013, https://doi.org/10.1144/SP378.4 --- 40Ar/39Ar geochronology and the diffusion of 39Ar in phengite–muscovite intergrowths during step-heating experiments in vacuo / Marnie A. Forster and Gordon S. Lister / Geological Society, London, Special Publications, 378, 117-135, 25 July 2013, https://doi.org/10.1144/SP378.16 --- Ar diffusion and solubility measurements in plagioclases using the ultra-violet laser depth-profiling technique / Jo-Anne Wartho, Simon P. Kelley and Stephen C. Elphick / Geological Society, London, Special Publications, 378, 137-154, 25 July 2013, https://doi.org/10.1144/SP378.13 --- Modelling effect of sericitization of plagioclase on the 40K/40Ar and 40Ar/39Ar chronometers: implication for dating basaltic rocks and mineral deposits / Chrystèle Verati and Fred Jourdan / Geological Society, London, Special Publications, 378, 155-174, 25 July 2013, https://doi.org/10.1144/SP378.14 --- The other isotopes: research avenues based on 36Ar, 37Ar and 38Ar / Grenville Turner and Ray Burgess / Geological Society, London, Special Publications, 378, 175-188, 13 March 2013, https://doi.org/10.1144/SP378.8 --- Applications: Tectonics --- 40Ar/39Ar Thermochronology on Central China Orogen: Cooling, uplift and implications for orogeny dynamics / Fei Wang, Rixiang Zhu, Quanlin Hou, Dewen Zheng, Liekun Yang, Lin Wu, Wenbei Shi, Huile Feng, Haiqing Sang, Hongyuan Zhang and Qing Liu / Geological Society, London, Special Publications, 378, 189-206, 24 January 2013, https://doi.org/10.1144/SP378.3 --- 40Ar/39Ar ages of crystallization and recrystallization of rock-forming polyhalite in Alpine rocksalt deposits / C. Leitner, F. Neubauer, J. Genser, S. Borojević-Šoštarić and G. Rantitsch / Geological Society, London, Special Publications, 378, 207-224, 24 January 2013, https://doi.org/10.1144/SP378.5 --- Persistent long-term (c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology / Jeff A. Benowitz, Paul W. Layer and Sam Vanlaningham / Geological Society, London, Special Publications, 378, 225-243, 20 June 2013, https://doi.org/10.1144/SP378.12 --- 40Ar/39Ar hornblende provenance clues about Heinrich event 3 (H3) / Greg E. Downing, Sidney R. Hemming, Anne Jost and Martin Roy / Geological Society, London, Special Publications, 378, 245-263, 30 September 2013, https://doi.org/10.1144/SP378.18 --- Observation of centimetre-scale argon diffusion in alkali feldspars: implications for 40Ar/39Ar thermochronology / Stephanie Flude, Alison M. Halton, Simon P. Kelley, Sarah C. Sherlock, James Schwanethal and Camilla M. Wilkinson / Geological Society, London, Special Publications, 378, 265-275, 10 January 2013, https://doi.org/10.1144/SP378.25 --- Applications: Volcanology --- 40Ar/39Ar age constraints on the Haifanggou and Lanqi formations: When did the first flowers bloom? / Su-Chin Chang, Haichun Zhang, Sidney R. Hemming, Gary T. Mesko and Yan Fang / Geological Society, London, Special Publications, 378, 277-284, 24 January 2013, https://doi.org/10.1144/SP378.1 --- Timing of geothermal activity in an active island-arc volcanic setting: First 40Ar/39Ar dating from Bouillante geothermal field (Guadeloupe, French West Indies) / C. Verati, P. Patrier-Mas, J. M. Lardeaux and V. Bouchot / Geological Society, London, Special Publications, 378, 285-295, 30 September 2013, https://doi.org/10.1144/SP378.19 --- Applications: Planetary sciences --- Issues in dating young rocks from another planet: Martian shergottites / Jisun Park, Donald D. Bogard, Laurence E. Nyquist and G. F. Herzog / Geological Society, London, Special Publications, 378, 297-316, 20 June 2013, https://doi.org/10.1144/SP378.10 --- A laser probe 40Ar/39Ar investigation of poikilitic shergottite NWA 4797: implications for the timing of shock metamorphism / Erin L. Walton, Simon Kelley, Christopher D. K. Herd and Anthony J. Irving / Geological Society, London, Special Publications, 378, 317-332, 20 June 2013, https://doi.org/10.1144/SP378.11 --- 40Ar/39Ar ages of impacts involving ordinary chondrite meteorites / Timothy D. Swindle, D. A. Kring and J. R. Weirich / Geological Society, London, Special Publications, 378, 333-347, 24 January 2013, https://doi.org/10.1144/SP378.6 --- A high-precision 40Ar/39Ar age for hydrated impact glass from the Dellen impact, Sweden / D. F. Mark, P. Lindgren and A. E. Fallick / Geological Society, London, Special Publications, 378, 349-366, 30 September 2013, https://doi.org/10.1144/SP378.22
    Pages: Online-Ressource (VI, 378 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781862396623
    Language: English
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  • 2
    Call number: 9/M 07.0421(378)
    In: Geological Society special publication
    Description / Table of Contents: Decoding the complete history of Earth and our solar system requires the placing of the scattered pages of Earth history in a precise chronological order, and the 40Ar/39Ar dating technique is one of the most trusteddating techniques to do that. The 40Ar/39Ar method has been in use for more than 40 years, and has constantlyevolved since then. The steady improvement of the technique is largely due to a better understandingof the K/Ar system, an appreciation of the subtleties of geological material and a continuous refinement ofthe analytical tools used for isotope extraction and counting. The 40Ar/39Ar method is also one of the mostversatile techniques with countless applications in archaeology, tectonics, structural geology, orogenic processesand provenance studies, ore and petroleum genesis, volcanology, weathering processes and climate,and planetary geology. This volume is the first of its kind and covers methodological developments, modelling,data handling, and direct applications of the 40Ar/39Ar technique.
    Type of Medium: Monograph available for loan
    Pages: VI, 378 Seiten , Illustrationen, Diagramme, Karten
    ISBN: 978-1-86239-360-8
    Series Statement: Geological Society special publication 378
    Classification:
    Historical Geology
    Language: English
    Note: TABLE OF CONTENTS Introduction Advances in 40Ar/39Ar dating: from archaeology to planetary sciences – introduction / Fred Jourdan, Darren F. Mark and Chrystele Verati / Geological Society, London, Special Publications, 378, 1-8, 16 January 2014, https://doi.org/10.1144/SP378.24 Perspectives on 40Ar/39Ar dating / Ian McDougall / Geological Society, London, Special Publications, 378, 9-20, 30 September 2013, https://doi.org/10.1144/SP378.20 Methodological developments Some footnotes to the optimization-based calibration of the 40Ar/39Ar system / Paul R. Renne / Geological Society, London, Special Publications, 378, 21-31, 25 July 2013, https://doi.org/10.1144/SP378.17 Neutron-induced 37Ar recoil ejection in Ca-rich minerals and implications for 40Ar/39Ar dating / F. Jourdan and P. R. Renne / Geological Society, London, Special Publications, 378, 33-52, 25 July 2013, https://doi.org/10.1144/SP378.15 Direct measurement of recoil effects on 40Ar/39Ar standards / Chris M. Hall / Geological Society, London, Special Publications, 378, 53-62, 13 March 2013, https://doi.org/10.1144/SP378.7 FCs-EK: a new sampling of the Fish Canyon Tuff 40Ar/39Ar neutron flux monitor / L. E. Morgan, D. F. Mark, J. Imlach, D. Barfod and R. Dymock / Geological Society, London, Special Publications, 378, 63-67, 30 September 2013, https://doi.org/10.1144/SP378.21 Petrology and geochronology of ‘muscovite age standard’ B4M / Alexandra R. Heri, Martin Robyr and Igor M. Villa / Geological Society, London, Special Publications, 378, 69-78, 24 January 2013, https://doi.org/10.1144/SP378.2 Argon extraction from geological samples by CO2 scanning laser step-heating / D. N. Barfod, D. F. Mark, A. Tait, R. C. Dymock and J. Imlach / Geological Society, London, Special Publications, 378, 79-90, 24 October 2013, https://doi.org/10.1144/SP378.23 The multi-diffusion domain model: past, present and future / T. Mark Harrison and Oscar M. Lovera / Geological Society, London, Special Publications, 378, 91-106, 13 March 2013, https://doi.org/10.1144/SP378.9 Diffusion of Ar in K-feldspar: Present and absent / Igor M. Villa / Geological Society, London, Special Publications, 378, 107-116, 24 January 2013, https://doi.org/10.1144/SP378.4 40Ar/39Ar geochronology and the diffusion of 39Ar in phengite–muscovite intergrowths during step-heating experiments in vacuo / Marnie A. Forster and Gordon S. Lister / Geological Society, London, Special Publications, 378, 117-135, 25 July 2013, https://doi.org/10.1144/SP378.16 Ar diffusion and solubility measurements in plagioclases using the ultra-violet laser depth-profiling technique / Jo-Anne Wartho, Simon P. Kelley and Stephen C. Elphick / Geological Society, London, Special Publications, 378, 137-154, 25 July 2013, https://doi.org/10.1144/SP378.13 Modelling effect of sericitization of plagioclase on the 40K/40Ar and 40Ar/39Ar chronometers: implication for dating basaltic rocks and mineral deposits / Chrystèle Verati and Fred Jourdan / Geological Society, London, Special Publications, 378, 155-174, 25 July 2013, https://doi.org/10.1144/SP378.14 The other isotopes: research avenues based on 36Ar, 37Ar and 38Ar / Grenville Turner and Ray Burgess / Geological Society, London, Special Publications, 378, 175-188, 13 March 2013, https://doi.org/10.1144/SP378.8 Applications: Tectonics 40Ar/39Ar Thermochronology on Central China Orogen: Cooling, uplift and implications for orogeny dynamics / Fei Wang, Rixiang Zhu, Quanlin Hou, Dewen Zheng, Liekun Yang, Lin Wu, Wenbei Shi, Huile Feng, Haiqing Sang, Hongyuan Zhang and Qing Liu / Geological Society, London, Special Publications, 378, 189-206, 24 January 2013, https://doi.org/10.1144/SP378.3 40Ar/39Ar ages of crystallization and recrystallization of rock-forming polyhalite in Alpine rocksalt deposits / C. Leitner, F. Neubauer, J. Genser, S. Borojević-Šoštarić and G. Rantitsch / Geological Society, London, Special Publications, 378, 207-224, 24 January 2013, https://doi.org/10.1144/SP378.5 Persistent long-term (c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology / Jeff A. Benowitz, Paul W. Layer and Sam Vanlaningham / Geological Society, London, Special Publications, 378, 225-243, 20 June 2013, https://doi.org/10.1144/SP378.12 40Ar/39Ar hornblende provenance clues about Heinrich event 3 (H3) / Greg E. Downing, Sidney R. Hemming, Anne Jost and Martin Roy / Geological Society, London, Special Publications, 378, 245-263, 30 September 2013, https://doi.org/10.1144/SP378.18 Observation of centimetre-scale argon diffusion in alkali feldspars: implications for 40Ar/39Ar thermochronology / Stephanie Flude, Alison M. Halton, Simon P. Kelley, Sarah C. Sherlock, James Schwanethal and Camilla M. Wilkinson / Geological Society, London, Special Publications, 378, 265-275, 10 January 2013, https://doi.org/10.1144/SP378.25 Applications: Volcanology 40Ar/39Ar age constraints on the Haifanggou and Lanqi formations: When did the first flowers bloom? / Su-Chin Chang, Haichun Zhang, Sidney R. Hemming, Gary T. Mesko and Yan Fang / Geological Society, London, Special Publications, 378, 277-284, 24 January 2013, https://doi.org/10.1144/SP378.1 Timing of geothermal activity in an active island-arc volcanic setting: First 40Ar/39Ar dating from Bouillante geothermal field (Guadeloupe, French West Indies) / C. Verati, P. Patrier-Mas, J. M. Lardeaux and V. Bouchot / Geological Society, London, Special Publications, 378, 285-295, 30 September 2013, https://doi.org/10.1144/SP378.19 Applications: Planetary sciences Issues in dating young rocks from another planet: Martian shergottites / Jisun Park, Donald D. Bogard, Laurence E. Nyquist and G. F. Herzog / Geological Society, London, Special Publications, 378, 297-316, 20 June 2013, https://doi.org/10.1144/SP378.10 A laser probe 40Ar/39Ar investigation of poikilitic shergottite NWA 4797: implications for the timing of shock metamorphism / Erin L. Walton, Simon Kelley, Christopher D. K. Herd and Anthony J. Irving / Geological Society, London, Special Publications, 378, 317-332, 20 June 2013, https://doi.org/10.1144/SP378.11 40Ar/39Ar ages of impacts involving ordinary chondrite meteorites / Timothy D. Swindle, D. A. Kring and J. R. Weirich / Geological Society, London, Special Publications, 378, 333-347, 24 January 2013, https://doi.org/10.1144/SP378.6 A high-precision 40Ar/39Ar age for hydrated impact glass from the Dellen impact, Sweden / D. F. Mark, P. Lindgren and A. E. Fallick / Geological Society, London, Special Publications, 378, 349-366, 30 September 2013, https://doi.org/10.1144/SP378.22
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  • 3
    Publication Date: 2020-07-08
    Description: The Souter Head sub-volcanic complex (Aberdeenshire, Scotland) intruded the high-grade metamorphic core of the Grampian Orogen at 469.1 ± 0.6 Ma (uranium-238–lead-206 (238U–206Pb) zircon). It follows closely peak metamorphism and deformation in the Grampian Terrane and tightly constrains the end of the Grampian Event of the Caledonian Orogeny. Temporally coincident U–Pb and argon/argon (40Ar/39Ar) data show the complex cooled quickly with temperatures decreasing from ca.800 °C to less than 200 °C within 1 Ma. Younger rhenium–osmium (Re–Os) ages are due to post-emplacement alteration of molybdenite to powellite. The U–Pb and Ar/Ar data combined with existing geochronological data show that D2/D3 deformation, peak metamorphism (Barrovian and Buchan style) and basic magmatism in NE Scotland were synchronous at ca.470 Ma and are associated with rapid uplift (5–10 km Ma−1) of the orogen, which, by ca.469 Ma, had removed the cover to the metamorphic pile. Rapid uplift resulted in decompressional melting and the generation of mafic and felsic magmatism. Shallow slab break-off (50–100 km) is invoked to explain the synchroneity of these events. This interpretation implies that peak metamorphism and D2/D3 ductile deformation were associated with extension. Similarities in the nature and timing of orogenic events in Connemara, western Ireland, with NE Scotland suggest that shallow slab break-off occurred in both localities.
    Print ISSN: 1755-6910
    Electronic ISSN: 1755-6929
    Topics: Geosciences
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  • 4
    Publication Date: 2020-07-01
    Description: The 40Ar/39Ar dating method is among the most versatile of geochronometers, having the potential to date a broad variety of K-bearing materials spanning from the time of Earth’s formation into the historical realm. Measurements using modern noble-gas mass spectrometers are now producing 40Ar/39Ar dates with analytical uncertainties of ∼0.1%, thereby providing precise time constraints for a wide range of geologic and extraterrestrial processes. Analyses of increasingly smaller subsamples have revealed age dispersion in many materials, including some minerals used as neutron fluence monitors. Accordingly, interpretive strategies are evolving to address observed dispersion in dates from a single sample. Moreover, inferring a geologically meaningful “age” from a measured “date” or set of dates is dependent on the geological problem being addressed and the salient assumptions associated with each set of data. We highlight requirements for collateral information that will better constrain the interpretation of 40Ar/39Ar data sets, including those associated with single-crystal fusion analyses, incremental heating experiments, and in situ analyses of microsampled domains. To ensure the utility and viability of published results, we emphasize previous recommendations for reporting 40Ar/39Ar data and the related essential metadata, with the amendment that data conform to evolving standards of being findable, accessible, interoperable, and reusable (FAIR) by both humans and computers. Our examples provide guidance for the presentation and interpretation of 40Ar/39Ar dates to maximize their interdisciplinary usage, reproducibility, and longevity.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
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  • 5
    Publication Date: 2011-08-01
    Description: An occurrence of the alkali-rich, Fe-Mn silicate sugilite [KNa2(Fe3+, Mn3+, Al)2Li3Si12O30] is reported from the Wolhaarkop manganese-rich chert breccia at the Bruce iron-ore mine, Northern Cape Province, South Africa. The upper portion of the breccia is dominated by braunite, albite, K-feldspar and aegirine, and locally hosts irregular-shaped void-fills (generally
    Print ISSN: 0935-1221
    Electronic ISSN: 1617-4011
    Topics: Geosciences
    Published by Schweizerbart
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  • 6
    Publication Date: 2017-01-23
    Description: The Yellowstone volcanic field is one of the largest and best-studied centres of rhyolitic volcanism on Earth, yet it still contains little-studied periods of activity. Such an example is the Island Park–Mount Jackson series, which erupted between the Mesa Falls and Lava Creek caldera-forming events as a series of rhyolitic domes and lavas. Here we present the first detailed characterisation of these lavas and use our findings to provide a framework for rhyolite generation in Yellowstone between 1·3 and 0·6 Ma, as well as to assess whether magmatic evolution hints at a forthcoming super-eruption. These porphyritic (15–40% crystals) lavas contain mostly sanidine and quartz with lesser amounts of plagioclase (consistent with equilibrium magmatic modelling via rhyolite-MELTS) and a complex assemblage of mafic minerals. Mineral compositions vary significantly between crystals in each unit, with larger ranges than expected from a single homogeneous population in equilibrium with its host melt. Oxygen isotopes in quartz and sanidine indicate slight depletions (δ18Omagma of 5·0–6·1‰), suggesting some contribution by localised remelting of hydrothermally altered material in the area of the previous Mesa Falls Tuff-related caldera collapse. The preservation of variable O isotopic compositions in quartz requires crystal entrainment less than a few thousand years prior to eruption. Late entrainment of rhyolitic material is supported by the occurrence of subtly older sanidines dated by single-grain 40Ar/39Ar geochronology. The eruption ages of the lavas show discrete clusters illustrating that extended quiescence (〉100 kyr) in magmatic activity may be a recurring feature in Yellowstone volcanism. Ubiquitous crystal aggregates, dominated by plagioclase, pyroxene and Fe–Ti oxides, are interpreted as cumulates co-erupted with their extracted liquid. Identical crystal aggregates are found in both normal-δ18O and low-δ18O rocks from Yellowstone, indicating that common petrogenetic processes characterise both volcanic suites, including the late-stage extraction of melt from an incrementally built upper crustal mush zone.
    Print ISSN: 0022-3530
    Electronic ISSN: 1460-2415
    Topics: Geosciences
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  • 7
    Publication Date: 2020-05-11
    Description: An Ordovician subvolcanic intrusive complex hosted by Neoproterozoic metasediments crops out at Souter Head about 6km S of Aberdeen, Scotland. The complex is composed mainly of two-mica red granite and breccia with minor dykes of pegmatite, quartz porphyry, felsite and dolerite, and widespread quartz veining, hydrothermal alteration and minor molybdenite mineralisation. Anomalous levels of bismuth (Bi), arsenic (As) and gold (Au) occur in quartz–pyrite veins. The complex has been mapped and the major- and minor-element geochemistry, including rare-earth elements of intrusives and mineralisation, has been determined. These data reveal a complex tectonic, intrusive and hydrothermal history. The intrusives are peraluminous and magnetite-, muscovite- and garnet-bearing. The youngest member, a quartz porphyry, is highly fractionated. There are two stages of hydrothermal activity: the first is linked to the explosive release of volatiles from a granite cupola and breccia formation; and the second, widespread quartz veining. Mo is associated with both stages, and Bi–As–Au anomalies are found in late quartz–pyrite veins. The mineralisation is classified as a granite-related vein-type Mo system. The unique preservation, in the Grampian terrane, of an Ordovician subvolcanic complex may be attributed to pre-Devonian movements on the nearby Dee fault and possibly also the collapse of the magma chamber following the explosive release of volatiles. The combination of large size, poor exposure and abundant multi-stage hydrothermal activity suggests that there is potential for further Mo and possibly Au mineralisation in this complex. Further mineralisation of this style may be present in the NE Grampian terrane.
    Print ISSN: 1755-6910
    Electronic ISSN: 1755-6929
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    Publication Date: 2020-11-01
    Print ISSN: 0009-2541
    Electronic ISSN: 1872-6836
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Elsevier
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