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Laidlaw Volcanics

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(a) SHRIMP zircon ages of the Laidlaw Volcanics from two analytical sessions. (b) Kerned probability plot for the Laidlaw Volcanics zircon ages. Mixture-modelling splits the central peak into two components but both are too old for the magmatic event.

( a ) SHRIMP zircon ages of the Laidlaw Volcanics from two analytical sessi... Available to Purchase

Published: 01 December 2000
F ig . 11. ( a ) SHRIMP zircon ages of the Laidlaw Volcanics from two analytical sessions. ( b ) Kerned probability plot for the Laidlaw Volcanics zircon ages. Mixture-modelling splits the central peak into two components but both are too old for the magmatic event.
Journal Article

Interpretation of SHRIMP and isotope dilution zircon ages for the Palaeozoic time-scale: II. Silurian to Devonian Available to Purchase

W. Compston
Published: 01 December 2000
Mineralogical Magazine (2000) 64 (6): 1127–1146.
...F ig . 11. ( a ) SHRIMP zircon ages of the Laidlaw Volcanics from two analytical sessions. ( b ) Kerned probability plot for the Laidlaw Volcanics zircon ages. Mixture-modelling splits the central peak into two components but both are too old for the magmatic event. ...
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View PDF for article title, Interpretation of SHRIMP and isotope dilution zircon ages for the Palaeozoic time-scale: II. Silurian to Devonian
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Journal Article

Urban Geochemistry and Human Health Available to Purchase

Gabriel M. Filippelli, Deborah Morrison, Domenico Cicchella
Journal: Elements
Published: 01 December 2012
Elements (2012) 8 (6): 439–444.
DOI: https://doi.org/10.2113/gselements.8.6.439
... ). The promise of a healthy and sustainable urban future is clouded, however, by the environmental insults, economic disparities, and behavioral pressures that exist in modern cities ( Filippelli and Laidlaw 2010 ; Wiehe et al. 2010 ). The challenge is not how to build a shiny, carbon-neutral city from scratch...
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Journal Article

Geologic Framework of the Veladero High-Sulfidation Epithermal Deposit Area, Cordillera Frontal, Argentina Available to Purchase

Diego Charchaflié, Richard M. Tosdal, James K. Mortensen
Journal: Economic Geology
Published: 01 March 2007
Economic Geology (2007) 102 (2): 171–192.
DOI: https://doi.org/10.2113/gsecongeo.102.2.171
... in a fine-grained matrix (tuffisites), represent near-vent facies. Laidlaw (2005) also reported hydrothermal breccias, but these, being part of the superposed hydrothermal system, are not part of the primary volcanic environment. Tuff, volcaniclastic siltstone and sandstone form sparse beds, 1 to 10...
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View PDF for article title, Geologic Framework of the Veladero High-Sulfidation Epithermal Deposit Area, Cordillera Frontal, Argentina
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Journal Article

The Veladero High-Sulfidation Epithermal Gold Deposit, El Indio-Pascua Belt, Argentina: Geochronology of Alunite and Jarosite Available to Purchase

Elizabeth A. Holley, Thomas Bissig, Thomas Monecke
Journal: Economic Geology
Published: 01 March 2016
Economic Geology (2016) 111 (2): 311–330.
DOI: https://doi.org/10.2113/econgeo.111.2.311
... volcanic activity in the region, dated at 12.7 ± 0.9 to 11.0 ± 0.2 Ma. In contrast to Veladero, the other high-sulfidation deposits in the belt are significantly younger with reported 40 Ar- 39 Ar alunite alteration ages of other major deposits in the belt ranging from 9.4 (the Lama deposit at Pascua Lama...
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View PDF for article title, The Veladero High-Sulfidation Epithermal Gold Deposit, El Indio-Pascua Belt, Argentina: Geochronology of Alunite and Jarosite
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Journal Article

The polarity of the Silurian magnetic field: indications from a global data compilation Available to Purchase

A. TRENCH, W. S. McKERROW, T. H. TORSVIK, Z. X. LI, S. R. McCRACKEN
Published: 01 September 1993
Journal of the Geological Society (1993) 150 (5): 823–831.
DOI: https://doi.org/10.1144/gsjgs.150.5.0823
... section of the Silurian record. Ludlow rocks show evidence of several polarity zones i.e. Ringerike, Bloomsburg, Wabash reef, Laidlaw volcanics (Fig. 3). The epoch is therefore regarded as of mixed polarity (Fig. 4). The lack of Pfidoli data can be partly overcome in that several Siluro-Devonian redbed...
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Journal Article

A comparison of K-Ar and Rb-Sr ages of rapidly cooled igneous rocks: two points in the Palaeozoic time scale re-evaluated Available to Purchase

I. S. Williams, N. W. Tetley, W. Compston, I. McDougall
Published: 01 September 1982
Journal of the Geological Society (1982) 139 (5): 557–568.
DOI: https://doi.org/10.1144/gsjgs.139.5.0557
.... Shirahase T. Rubidium-strontium age determinations on micas from a geologically controlled composite batholith J. geol. Soc. Aust 1975 22 495 505 Wyborn D. Owen M. Compston W. McDougall I. The Laidlaw Volcanics: a Late Silurian point on the geological time scale Earth...
View PDF for article title, A comparison of K-Ar and Rb-Sr ages of rapidly cooled igneous rocks: two points in the Palaeozoic time scale re-evaluated
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Journal Article

Geochronology of Late Caledonian magmatism in northern Britain Available to Purchase

M. F. THIRLWALL
Published: 01 December 1988
Journal of the Geological Society (1988) 145 (6): 951–967.
DOI: https://doi.org/10.1144/gsjgs.145.6.0951
... Wyborn D. Owen M. Compston W. McDougall I. The Laidlaw Volcanics: a Late Silurian point on the geological time scale Earth and Planetary Science Letters 1982 59 90 100 York D. Least squares fitting of a straight line with correlated errors Earth and Planetary Science...
View PDF for article title, Geochronology of Late Caledonian magmatism in northern Britain
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Journal Article

Evolution of High-Level Magmatic-Hydrothermal Systems: New Insights from Ore Paragenesis of the Veladero High-Sulfidation Epithermal Au-Ag Deposit, El Indio-Pascua Belt, Argentina Available to Purchase

Elizabeth A. Holley, Thomas Monecke, Thomas Bissig, T. James Reynolds
Journal: Economic Geology
Published: 01 November 2017
Economic Geology (2017) 112 (7): 1747–1771.
DOI: https://doi.org/10.5382/econgeo.2017.4528
... as disseminated high-fineness native Au grains. Iron oxide/hydroxide and jarosite are present throughout the ore zones ( Laidlaw, 2005 ). The present contribution reports on the first detailed petrographic and mineralogical study on intensely altered volcanic rocks from the Veladero deposit. As paragenetic...
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View PDF for article title, Evolution of High-Level Magmatic-Hydrothermal Systems: New Insights from Ore Paragenesis of the Veladero High-Sulfidation Epithermal Au-Ag Deposit, El Indio-Pascua Belt, Argentina
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Journal Article

Tracer Penetration into Welded Tuff Matrix from Flowing Fractures Available to Purchase

Qinhong Hu, Timothy J. Kneafsey, Robert C. Trautz, Joseph S. Y. Wang
Published: 01 August 2002
Vadose Zone Journal (2002) 1 (1): 102–112.
DOI: https://doi.org/10.2113/1.1.102
... are approximately 4 m wide, 3 m high, and 9 m deep within the Topopah Spring welded (TSw) volcanic tuff, the potential repository geologic unit. The intrinsic permeability for the rock matrix of the TSw is on the order of 10 −18 m 2 ( Flint, 1998 ). Figure 1 shows the location of seven horizontal boreholes...
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Characterization of a Landslide using Seismic Refraction, Electrical Resistivity and Hydrometer Methods, Adatepe – Çanakkale, NW Turkey Available to Purchase

Tolga Bekler, Yunus Levent Ekinci, Alper Demirci, Ahmet Evren Erginal, Can Ertekin
Published: 01 September 2011
Journal of Environmental and Engineering Geophysics (2011) 16 (3): 115–126.
DOI: https://doi.org/10.2113/JEEG16.3.115
...-Middle Miocene volcanics. The volcanic suite is represented by a weathered andesitic composition of the Doyran, Ezine Volcanics as discussed by Siyako et al. (1989) . The geological material involved in the landslide is the Güzelyalı member of the Çanakkale Formation ( Atabey et al. , 2004...
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View PDF for article title, Characterization of a Landslide using Seismic Refraction, Electrical Resistivity and Hydrometer Methods, Adatepe – Çanakkale, NW Turkey
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Multiple Tracing Experiments in Unsaturated Fractured Clayey Till Available to Purchase

Annette P. Mortensen, Karsten H. Jensen, Bertel Nilsson, René K. Juhler
Published: 01 May 2004
Vadose Zone Journal (2004) 3 (2): 634–644.
DOI: https://doi.org/10.2113/3.2.634
... of the pH sensitivity of the uranine fluorescence ( Käss, 1998 ; Smart and Laidlaw, 1977 ). Since the pH during the experiments changed from approximately 6 in the tracer solution to approximately 7.5 in the effluent water, the concentration of inlet and outlet water were measured at varying pH conditions...
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THERMAL CONSTRAINTS ON CLAY GROWTH IN FAULT GOUGE AND THEIR RELATIONSHIP WITH FAULT-ZONE EVOLUTION AND HYDROTHERMAL ALTERATION: CASE STUDY OF GOUGES IN THE KOJAKU GRANITE, CENTRAL JAPAN Available to Purchase

Masakazu Niwa, Koji Shimada, Hajimu Tamura, Kenji Shibata, Shigeru Sueoka, Ken-ichi Yasue, Tsuneari Ishimaru, Koji Umeda
Published: 01 April 2016
Clays and Clay Minerals (2016) 64 (2): 86–107.
DOI: https://doi.org/10.1346/CCMN.2016.0640202
..., based on the modified Stokes’ equation ( Puretz, 1979 ; Ross and Morrison, 1988 ; McFadyen and Fairhurst, 1993 ; Laidlaw and Steinmetz, 2005 ). The sample separation into three size fractions using a repetitive freeze-thaw technique allows for the identification of authigenic clay minerals...
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View PDF for article title, THERMAL CONSTRAINTS ON CLAY GROWTH IN FAULT GOUGE AND THEIR RELATIONSHIP WITH FAULT-ZONE EVOLUTION AND HYDROTHERMAL ALTERATION: CASE STUDY OF GOUGES IN THE KOJAKU GRANITE, CENTRAL JAPAN
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Diagenesis and Microscopic Heterogeneity of Lacustrine Deltaic and Turbiditic Sandstone Reservoirs (Lower Cretaceous), Potiguar Basin, Brazil Available to Purchase

Marco A. S. Moraes
Journal: AAPG Bulletin
Published: 11 November 1991
AAPG Bulletin (1991) 75 (11): 1758–1771.
DOI: https://doi.org/10.1306/0C9B29F7-1710-11D7-8645000102C1865D
..., volcanic rock fragments were strongly deformed between the more rigid grains, producing compaction matrix ( Figure 7A ) which averages 3% of the bulk rock volume (BRV) ( Table 1 ). Minus-cement porosity measurements, which are typically less than 30%, indicate that most of the mechanical compaction...
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View PDF for article title, Diagenesis and Microscopic Heterogeneity of Lacustrine Deltaic and Turbiditic Sandstone Reservoirs (Lower Cretaceous), Potiguar Basin, Brazil
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An Integrated Approach of Numerical Well Test for Well Intersecting Fractures Based on FMI Image Open Access

Guodong Jin, Huilin Xing, Tianbin Li, Rongxin Zhang, Junbiao Liu, Zhiwei Guo, Zihan Ma
Journal: Lithosphere
Publisher: GSW
Published: 10 January 2022
Lithosphere (2021) 2021 (Special 1): 4421135.
DOI: https://doi.org/10.2113/2022/4421135
... that hosts tremendous thermal coal and CSG resources [ 35 ]. The basin has more than 500 Gt of coal and considerable potential reserves of coalbed methane [ 32 ]. The Gunnedah basin is unconformably located on the Permian or older basement and partially unconformably covered by sedimentary and volcanic rocks...
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U-Pb (zircon) age constraints on the timing and duration of Wenlock (Silurian) paleocommunity collapse and recovery during the “Big Crisis” Available to Purchase

Bradley D. Cramer, Daniel J. Condon, Ulf Söderlund, Carly Marshall, Graham J. Worton, Alan T. Thomas, Mikael Calner, David C. Ray, Vincent Perrier, Ian Boomer, P. Jonathan Patchett, Lennart Jeppsson
Journal: GSA Bulletin
Published: 01 November 2012
GSA Bulletin (2012) 124 (11-12): 1841–1857.
DOI: https://doi.org/10.1130/B30642.1
... Conservation Review Series , v. 19 , p. 3 – 22 . Wyborn D. Owen N. Compston W. McDougall I. , 1982 , The Laidlaw Volcanics: A Late Silurian point on the geological time scale : Earth and Planetary Science Letters , v. 59 , p. 90 – 100 , doi:10.1016/0012-821X(82)90119-4...
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Big Hill Salt Dome, Matagorda County, Texas Available to Purchase

Albert G. Wolf
Journal: AAPG Bulletin
Published: 01 July 1925
AAPG Bulletin (1925) 9 (4): 711–737.
DOI: https://doi.org/10.1306/3D9326D4-16B1-11D7-8645000102C1865D
... deposits in general are formed by either volcanic or hot-spring activities, or are found in close association with limestone, gypsum, and anhydrite in sedimentary beds. The world’s greatest sulphur bodies, those of Sicily and the Gulf Coastal region of Texas and Louisiana, belong to the latter class...
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Craters of the Moon National Monument basalts as unshocked compositional and weathering analogs for martian rocks and meteorites Available to Purchase

Christopher T. Adcock, Arya Udry, Elisabeth M. Hausrath, Oliver Tschauner
Published: 01 April 2018
American Mineralogist (2018) 103 (4): 502–516.
DOI: https://doi.org/10.2138/am-2018-6193
... rocks as they are both enriched in SiO 2 and alkalis. We chose the fine-grained “Group 2” class described as aphyric effusive volcanic rocks as they are texturally more similar to COTM lavas ( Putirka et al. 2009 ; Sautter et al. 2015 ). * E-mail: [email protected]...
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View PDF for article title, Craters of the Moon National Monument basalts as unshocked compositional and weathering analogs for martian rocks and meteorites
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SEG Newsletter 80 (January) Available to Purchase

Journal: SEG Discovery
Published: 01 January 2010
SEG Discovery (2010) (80): 1–56.
DOI: https://doi.org/10.5382/SEGnews.2010-80
... and volcanic rocks deposit area (width of photograph in center is ~2 km). The deposit extends beyond the photograph in both direc- 0 ft ASL tions. Boundaries for the Pebble West (red) and Pebble East (black) zones are based on >0.3% CuEQ and >0.6%CuEQ, >0.30% Cu Equiv Open Open -1000 ft respectively. Note...
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Book Chapter

A review of Devonian time scales: databases, construction and new data Available to Purchase

Author(s)
B.P.J. Williams, P.F. Friend, E.A. Williams
Book: New Perspectives on the Old Red Sandstone
Series: Geological Society, London, Special Publications
Publisher: Geological Society of London
Published: 01 January 2000
DOI: 10.1144/GSL.SP.2000.180.01.02
EISBN: 9781862394285
... of sedimentary or metasedimentary source rocks, will be restite rich and will thus very probably contain several populations of inherited zircons (e.g. the Laidlaw Volcanics, Wyborn et al. ( 1982 )), making interpretation of the magmatic age of the rock exceptionally difficult. Methods of time-scale...
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Abstract
View PDF for content titled, A review of Devonian time scales: databases, construction and new data
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Abstract Aspects of the isotopic age and stratigraphical databases underpinning Devonian geological time scales are reviewed to assess differences in recent U–Pb zircon-based schemes and older schemes based on Rb–Sr, K–Ar, 40 Ar– 39 Ar dating of minerals and whole-rock samples. The various methods of time-scale construction are described and, with their databases, 14 calibrations of Devonian time are discussed. Finally, the most recent data are collated and compared against current U–Pb-based time scales.