Rosalind Tuthill Helz, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 47
Trace-element analyses of core samples from the 1967-1988 drillings of Kilauea Iki lava lake, Hawaii Trace-element analyses of core samples from the 1967-1988 drillings of Kilauea Iki lava lake, Hawaii
This report presents previously unpublished analyses of trace elements in drill core samples from Kilauea Iki lava lake and from the 1959 eruption that fed the lava lake. The two types of data presented were obtained by instrumental neutron-activation analysis (INAA) and energy-dispersive X-ray fluorescence analysis (EDXRF). The analyses were performed in U.S. Geological Survey (USGS)...
Authors
Rosalind Tuthill Helz
Diffusion-driven magnesium and iron isotope fractionation in Hawaiian olivine Diffusion-driven magnesium and iron isotope fractionation in Hawaiian olivine
Diffusion plays an important role in Earth sciences to estimate the timescales of geological processes such as erosion, sediment burial, and magma cooling. In igneous systems, these diffusive processes are recorded in the form of crystal zoning. However, meaningful interpretation of these signatures is often hampered by the fact that they cannot be unambiguously ascribed to a single...
Authors
F.-Z. Teng, N. Dauphas, Rosalind Tuthill Helz, S. Gao, S. Huang
Whole-rock analyses of core samples from the 1988 drilling of Kilauea Iki lava lake, Hawaii Whole-rock analyses of core samples from the 1988 drilling of Kilauea Iki lava lake, Hawaii
This report presents and evaluates 64 major-element analyses of previously unanalyzed Kilauea Iki drill core, plus three samples from the 1959 and 1960 eruptions of Kilauea, obtained by X-ray fluorescence (XRF) analysis during the period 1992 to 1995. All earlier major-element analyses of Kilauea Iki core, obtained by classical (gravimetric) analysis, were reported and evaluated in Helz...
Authors
Rosalind Tuthill Helz, Joseph E. Taggart
Processes active in mafic magma chambers: The example of Kilauea Iki Lava Lake, Hawaii Processes active in mafic magma chambers: The example of Kilauea Iki Lava Lake, Hawaii
Kilauea Iki lava lake formed in 1959 as a closed chamber of 40 million m3 of picritic magma. Repeated drilling and sampling of the lake allows recognition of processes of magmatic differentiation, and places time restrictions on the periods when they operated. This paper focuses on evidence for the occurrence of lateral convection in the olivine-depleted layer, and constraints on the...
Authors
Rosalind Tuthill Helz
Fractionation of the platinum-group elments and Re during crystallization of basalt in Kilauea Iki Lava Lake, Hawaii Fractionation of the platinum-group elments and Re during crystallization of basalt in Kilauea Iki Lava Lake, Hawaii
Kilauea Iki lava lake formed during the 1959 summit eruption of Kilauea Volcano, then crystallized and differentiated over a period of 35??years. It offers an opportunity to evaluate the fractionation behavior of trace elements in a uniquely well-documented basaltic system. A suite of 14 core samples recovered from 1967 to 1981 has been analyzed for 5 platinum-group elements (PGE: Ir, Os...
Authors
L. Pitcher, Rosalind Tuthill Helz, R.J. Walker, P. Piccoli
Iron isotope fractionation during magmatic differentiation in Kilauea Iki lava lake Iron isotope fractionation during magmatic differentiation in Kilauea Iki lava lake
Magmatic differentiation helps produce the chemical and petrographic diversity of terrestrial rocks. The extent to which magmatic differentiation fractionates nonradiogenic isotopes is uncertain for some elements. We report analyses of iron isotopes in basalts from Kilauea Iki lava lake, Hawaii. The iron isotopic compositions (56Fe/54Fe) of late-stagemeltveins are 0.2 permil (per...
Authors
F.-Z. Teng, N. Dauphas, Rosalind Tuthill Helz
Science and Products
Filter Total Items: 47
Trace-element analyses of core samples from the 1967-1988 drillings of Kilauea Iki lava lake, Hawaii Trace-element analyses of core samples from the 1967-1988 drillings of Kilauea Iki lava lake, Hawaii
This report presents previously unpublished analyses of trace elements in drill core samples from Kilauea Iki lava lake and from the 1959 eruption that fed the lava lake. The two types of data presented were obtained by instrumental neutron-activation analysis (INAA) and energy-dispersive X-ray fluorescence analysis (EDXRF). The analyses were performed in U.S. Geological Survey (USGS)...
Authors
Rosalind Tuthill Helz
Diffusion-driven magnesium and iron isotope fractionation in Hawaiian olivine Diffusion-driven magnesium and iron isotope fractionation in Hawaiian olivine
Diffusion plays an important role in Earth sciences to estimate the timescales of geological processes such as erosion, sediment burial, and magma cooling. In igneous systems, these diffusive processes are recorded in the form of crystal zoning. However, meaningful interpretation of these signatures is often hampered by the fact that they cannot be unambiguously ascribed to a single...
Authors
F.-Z. Teng, N. Dauphas, Rosalind Tuthill Helz, S. Gao, S. Huang
Whole-rock analyses of core samples from the 1988 drilling of Kilauea Iki lava lake, Hawaii Whole-rock analyses of core samples from the 1988 drilling of Kilauea Iki lava lake, Hawaii
This report presents and evaluates 64 major-element analyses of previously unanalyzed Kilauea Iki drill core, plus three samples from the 1959 and 1960 eruptions of Kilauea, obtained by X-ray fluorescence (XRF) analysis during the period 1992 to 1995. All earlier major-element analyses of Kilauea Iki core, obtained by classical (gravimetric) analysis, were reported and evaluated in Helz...
Authors
Rosalind Tuthill Helz, Joseph E. Taggart
Processes active in mafic magma chambers: The example of Kilauea Iki Lava Lake, Hawaii Processes active in mafic magma chambers: The example of Kilauea Iki Lava Lake, Hawaii
Kilauea Iki lava lake formed in 1959 as a closed chamber of 40 million m3 of picritic magma. Repeated drilling and sampling of the lake allows recognition of processes of magmatic differentiation, and places time restrictions on the periods when they operated. This paper focuses on evidence for the occurrence of lateral convection in the olivine-depleted layer, and constraints on the...
Authors
Rosalind Tuthill Helz
Fractionation of the platinum-group elments and Re during crystallization of basalt in Kilauea Iki Lava Lake, Hawaii Fractionation of the platinum-group elments and Re during crystallization of basalt in Kilauea Iki Lava Lake, Hawaii
Kilauea Iki lava lake formed during the 1959 summit eruption of Kilauea Volcano, then crystallized and differentiated over a period of 35??years. It offers an opportunity to evaluate the fractionation behavior of trace elements in a uniquely well-documented basaltic system. A suite of 14 core samples recovered from 1967 to 1981 has been analyzed for 5 platinum-group elements (PGE: Ir, Os...
Authors
L. Pitcher, Rosalind Tuthill Helz, R.J. Walker, P. Piccoli
Iron isotope fractionation during magmatic differentiation in Kilauea Iki lava lake Iron isotope fractionation during magmatic differentiation in Kilauea Iki lava lake
Magmatic differentiation helps produce the chemical and petrographic diversity of terrestrial rocks. The extent to which magmatic differentiation fractionates nonradiogenic isotopes is uncertain for some elements. We report analyses of iron isotopes in basalts from Kilauea Iki lava lake, Hawaii. The iron isotopic compositions (56Fe/54Fe) of late-stagemeltveins are 0.2 permil (per...
Authors
F.-Z. Teng, N. Dauphas, Rosalind Tuthill Helz