scholarly journals Programs in Hewlett-Packard BASIC for storing, retrieving, and plotting rare-earth element data for geochemical studies, using HP-9831/9872 desk top computers and plotters

1979 ◽  
Author(s):  
K. R. Ludwig ◽  
John S. Stuckless
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Hewlett Packard ◽  
Element Data ◽  
Geochemical Studies

scholarly journals Multiple origins for mantle harzburgites: examples from the Lewis Hills, Bay of Islands ophiolite, Newfoundland

1995 ◽  
Vol 32 (7) ◽  
pp. 1046-1057 ◽  
Author(s):  
Stephen J. Edwards ◽  
John Malpas
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Rock Type ◽  
Left Behind ◽  
Hydrous Fluid ◽  
Multiple Origins ◽  
Geochemical Studies ◽  
Investigative Process ◽  
Basaltic Melts

Harzburgite is a common rock type in ophiolites and alpine peridotites. It is considered to be typical of a residual mantle mineralogy, i.e., material left behind after periods of extensive mantle melting and melt–rock and fluid–rock interactions that produce a variety of basaltic melts. The processes by which these melts and residua are produced are complicated; therefore, to fully understand them, it is necessary to undertake detailed and integrated field, petrographic, and geochemical studies of large exposures of mantle material as part of the investigative process. Such a study in the Bay of Islands ophiolite exposed in the Lewis Hills of Newfoundland has enabled the identification of four major types of harzburgite, which represent examples of a complete spectrum of this rock type. Depleted, residual harzburgite and associated dunite, with positive-sloping rare earth element patterns, may develop U-shaped rare earth element patterns and a visible orthopyroxene enrichment by the introduction of a component of high-Mg, quartz-normative melt, or a hydrous fluid component with a high Si/Al ratio. Conversely, U-shaped rare earth element patterns and apparent orthopyroxene depletion may occur by the addition of low-Si/Al, hydrous fluid. Such enrichments and depletions of orthopyroxene by solution–precipitation reactions may result not only in the variety of harzburgite types, which on partial melting might produce a range of melt products, but also in fronts of harzburgite migrating through the mantle.

Origin of Pleistocene-Holocene ashes of the Russian northeast based on trace and rare earth element data

2006 ◽  
Vol 411 (2) ◽  
pp. 1351-1356 ◽  
Author(s):  
V. G. Sakhno ◽  
L. I. Bazanova ◽  
O. Yu. Glushkova ◽  
I. V. Melekestsev ◽  
V. V. Ponomareva ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Element Data ◽  
Russian Northeast
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