Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Stephen E. DeLong"'
Publikováno v:
Journal of Geophysical Research: Solid Earth. 100:4197-4214
Basaltic lavas recovered in a single dredge haul from the Blanco Trough, in the western portion of the Blanco Fracture Zone, demonstrate that off-axis volcanism can produce significant compositional variability in lavas that are closely related spati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3527408227863578306f90229766348e
https://doi.org/10.1029/94jb02774
https://doi.org/10.1029/94jb02774
Publikováno v:
International Journal of Mass Spectrometry and Ion Processes. 125:95-126
A theory of ion motion in a cubic ICR cell is presented for differential sinusoidal excitation that explains the observed stability, orders of magnitude, and resonance positions for excitation frequencies away from the cyclotron frequency. This is ac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ba2e33fd0d91e39bcaec070e788659c
https://doi.org/10.1016/0168-1176(93)80034-c
https://doi.org/10.1016/0168-1176(93)80034-c
Publikováno v:
International Journal of Mass Spectrometry and Ion Processes. 124:223-239
Fourier transform ion cyclotron resonance mass spectrometry has undergone significant advances in development of instrumentation, excitation, and detection modes since its introduction over 15 years ago. Relatively little effort has been focused, how
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::780db2e583451b112a7bd01b4d5c2d35
https://doi.org/10.1016/0168-1176(93)80093-t
https://doi.org/10.1016/0168-1176(93)80093-t
Autor:
Stephen E. DeLong, Roger L. Nielsen
Publikováno v:
Contributions to Mineralogy and Petrology. 110:355-369
With few exceptions, geochemical models of igneous differentiation have assumed that crystals form homogeneously throughout the cooling magma chamber. This is in spite of field evidence and physical models suggesting for natural systems, that heat lo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f92f8816a4118c4d2db2f8b778edae7d
https://doi.org/10.1007/bf00310750
https://doi.org/10.1007/bf00310750
Autor:
Stephen E. DeLong, Carole Chatelain
Publikováno v:
Earth and Planetary Science Letters. 101:206-215
Despite the rarity or absence of ilmenite, apatite and zircon in MORB glasses, their relative ubiquity in ocean-floor and ophiolitic plutonic rocks indicates that they eventually crystallize in sufficiently evolved magma. We have inferred the followi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e01a1d8d59342f5af570b17cb798262b
https://doi.org/10.1016/0012-821x(90)90154-p
https://doi.org/10.1016/0012-821x(90)90154-p
Autor:
D. W. Mitchell, Stephen E. DeLong
Publikováno v:
International Journal of Mass Spectrometry and Ion Processes. 96:1-16
A Fourier transform ion cyclotron resonance (FT/ICR) time domain signal (TDS) can be simply described by a superposition of exponentially decaying sinusoids. If the mass components decay at different rates, however, then the FT magnitude peak heights
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b6610e5391ee2e74be3511e6c1f33461
https://doi.org/10.1016/0168-1176(90)80038-5
https://doi.org/10.1016/0168-1176(90)80038-5
Publikováno v:
Geoscience Canada. 41:523
This paper reviews the geological setting and reports new geochemical trace element data from the Ordovician Lawrence Head Volcanics (LHV) and the underlying gabbro sills in the Exploits Group. In combination with existing published analyses and ages
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a0b4a86c8e7bc08688248e6a0e55301f
https://doi.org/10.12789/geocanj.2014.41.053
https://doi.org/10.12789/geocanj.2014.41.053
Autor:
Stephen E. DeLong
Publikováno v:
First Monday; Volume 2, Number 5-5 May 1997
The Web challenges the authority of the professor in the classroom by democratizing information. It shifts the focus from professor and lecture to student and information. The culture of higher education is likely to be profoundly changed as a result
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::89e3b860043fdee4adea5ffae8c7b3f1
http://firstmonday.org/ojs/index.php/fm/article/view/526
http://firstmonday.org/ojs/index.php/fm/article/view/526
Autor:
Peter Lyman, Stephen E. DeLong
Publikováno v:
Chemical Geology. 35:173-176
This paper illustrates and describes the use of a simple device, modified from an ordinary beaker, to enhance condensation and capture of water evolved during the analysis of silicate rocks by the rapid method of Shapiro and Brannock. Duplicate deter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::39f0682ba1e9af0710fc3ecd6ba12f99
https://doi.org/10.1016/0009-2541(82)90027-4
https://doi.org/10.1016/0009-2541(82)90027-4
Publikováno v:
The Journal of Geology. 93:609-618
Semisopochnoi has erupted a tholeiitic suite of moderately evolved lavas ($SiO_{2} = 50-65\%; Zr = 64-250 ppm; La = 10-60x chondrites$), whose bulk-rock chemistry and phenocryst mineralogy are generally compatible with an important role for fractiona
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c92aa33f404fe1b8eb1649c7bf52d8a0
https://doi.org/10.1086/628985
https://doi.org/10.1086/628985