scholarly journals Dating igneous rocks using the Potassium-Argon Laser Experiment (KArLE) instrument: A case study for ~380 Ma basaltic rocks

2018 ◽  
Vol 32 (20) ◽  
pp. 1755-1765 ◽  
Author(s):  
Yuichiro Cho ◽  
Barbara A. Cohen
Keyword(s):  
Argon Laser ◽  
Igneous Rocks ◽  
Basaltic Rocks ◽  
Laser Experiment

scholarly journals The Potassium‐Argon Laser Experiment ( KA r LE ): In Situ Geochronology for Planetary Robotic Missions

2014 ◽  
Vol 38 (4) ◽  
pp. 421-439 ◽  
Author(s):  
Barbara A. Cohen ◽  
J. Scott Miller ◽  
Zheng‐Hua Li ◽  
Timothy D. Swindle ◽  
Renee A. French
Keyword(s):  
Argon Laser ◽  
Laser Experiment ◽  
Robotic Missions

Influence of engineering properties on Polished Stone Value (PSV): A case study on basic igneous rocks from Serbia

2015 ◽  
Vol 101 ◽  
pp. 1088-1096 ◽  
Author(s):  
Olivera Đokić ◽  
Vesna Matović ◽  
Suzana Erić ◽  
Kristina Šarić
Keyword(s):  
Igneous Rocks ◽  
Engineering Properties

Occurrence of anatase in reworking altered ash beds (K-bentonites and tonsteins) and discrimination of source magmas: a case study of terrestrial Permian–Triassic boundary successions in China

Clay Minerals ◽  
2021 ◽  
pp. 1-13
Author(s):  
Hanlie Hong ◽  
Xiaoxue Jin ◽  
Miao Wan ◽  
Kaipeng Ji ◽  
Chen Liu ◽  
...  
Keyword(s):  
Clay Fraction ◽  
Igneous Rocks ◽  
Stratigraphic Correlation ◽  
Triassic Boundary ◽  
Source Discrimination ◽  
Sediment Reworking ◽  
Volcanic Source ◽  
Marine Facies ◽  
Permian Triassic Boundary

Abstract Potential secondary influences on titanium distribution should be evaluated when using ash beds as volcanic source indicators and for correlation purposes. In this study, well-correlated altered ash beds in Permian–Triassic boundary (PTB) successions of various facies in South China were investigated to better understand their use in source discrimination and stratigraphic correlation. The ash beds deposited in lacustrine and paludal facies contain significantly more Ti relative to deposits in marine facies. Neoformed anatase grains nanometres to micrometres in size are associated closely with clay minerals, whereas detrital anatase was observed in the remnants of altered ash beds of terrestrial facies. Extraction of the clay fraction of altered ash beds may exclude significantly detrital accessory minerals such as anatase and rutile added during sediment reworking, and the concentrations of immobile elements in the clay fraction may therefore be used to interpret more effectively their source igneous rocks.

scholarly journals V.—On the Basaltic Rocks of the Midland Coal-fields

1870 ◽  
Vol 7 (70) ◽  
pp. 159-162 ◽  
Author(s):  
Samuel Allport
Keyword(s):  
Igneous Rocks ◽  
Microscopical Examination ◽  
Coal Field ◽  
The South ◽  
Short Account ◽  
Basaltic Rocks ◽  
Coal Fields

In the GeologicalMagazine for March last, Vol. VI., p. 115, I gave a short account of the discovery of Olivine and its pseudomorphs in the igneous rocks of the South Staffordshire Coal-field, and as I have since then made a microscopical examination of similar rocks from the surrounding district, I am induced to offer the following observations.

scholarly journals Early Tertiary flood basalts from Hareøen and western Nûgssuaq, West Greenland

1976 ◽  
Vol 120 ◽  
pp. 1-36
Author(s):  
N Hald
Keyword(s):  
Thin Layers ◽  
Igneous Rocks ◽  
Chemical Analyses ◽  
Flood Basalts ◽  
The West ◽  
West Greenland ◽  
Basaltic Rocks ◽  
Magmatic Rocks ◽  
Incompatible Elements ◽  
Early Tertiary

In central West Greenland flood basalts were erupted in the Early Tertiary. On Hareøen and western Nûgssuaq the upper part of the volcanic sequence predominates reaching a thickness of more than 3 km. In these two areas tholeiitic, olivine porphyritic basalts and picritic basalts are followed by tholeiitic basalts with plagioclase as the dominant phenocryst. The content of incompatible elements in the plagioclase porphyritic basalts is low in the early stages, as is the case in most of the older olivine porphyritic lavas in the province; however, after a pause in the volcanic activity, the concentration of these elements is increased by a factor of 3-6. A few thin layers of peralkaline, rhyolitic tuffs are found in the upper part of the plagioclase porphyritic sequence. The tholeiitic lavas are intruded by dykes. Most of these are petrographically the equivalent of the extrusive rocks, but dykes of transitional olivine basalts are presumed to represent a younger magmatic episode from which no lavas are known. The youngest igneous rocks in the area – and perhaps the youngest lavas in all of the West Greenland basalt province – are olivine porphyritic, alumina enriched transitional basalts deposited unconformably on the tholeiitic sequence on Hareøen. Forty-three new chemical analyses of the magmatic rocks are presented as well as micro-probe data on phenocryst and groundmass phases. The diversity of basaltic rocks cannot be explained by low pressure crystal fractionation alone, and it is suggested that the chemical evolution of the lavas and dyke rocks reflect chemical variations in batches of olivine rich magmas injected into the crust from the mantle.

scholarly journals Analysis of Smog Generated from Organic Tissue by Laser Irradiation (Part 2) : Case Study by Argon Laser Scalpel

1985 ◽  
Vol 55 (1) ◽  
pp. 16-19
Author(s):  
Toyoki KUGIMIYA ◽  
Haruo ADACHI ◽  
Tsuyoshi KATAIGI ◽  
Masakazu TSUZUKI ◽  
Akio IHARA ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Argon Laser ◽  
Laser Scalpel ◽  
Organic Tissue
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