Differentiation in the cumulates from a Mauna Loa, Hawaii magma chamber

Schwindinger, K R; Anderson, A F

Title: Differentiation in the cumulates from a Mauna Loa, Hawaii magma chamber

Full Record
Other Related Research

Abstract

The interstitial glass in cognate nodules from Mauna Loa, has by chemical diffusion or convective fluid transport, remained in equilibrium with the overlying magma. The glass bearing nodules were collected from Damona Cone on the southwest rift zone of Mauna Loas. The nodules have approximately 15% olivine, 40% orthopyroxene plus clinopyroxene (3-20%), and 85% plagioclase plus vescicular glass (2-25%). Olivine norites have anhedral olivine mantled with anhedral orthopyroxene, subhedral to euhedral pyroxene, anhedral plagioclase, and 20 to 25% glass. Olivine gabbros have anhedral olivine, subequant, anhedral to subhedral pyroxene and plagioclase and less than 10% glass. The bulk composition of greater than 15%, MgO, with the textures, indicate the nodules are an accumulative origin. Thus these nodules are partially solidified pieces of crystal/liquid accumulative mush. The compositions of the olivines are Fa 18 to 25 mole percent, of the plagioclases are An 70 to 80 mole percent. The composition of the orthopyroxene is En76 Fs19 Wo5, and of the clinopyroxene is En50 Fall Wo30. The composition of the interstitial glasses is: SiO2 52.54, TiO2 2.04, Al2O3 14.39, FeO 11.47, MgO 7.15, CaO 10.28, Na20 1.42, K2O 0.39, P2O5 0.21. The low Na2O is from two nodules that may have experiencedmore »« less

Authors:: Schwindinger, K R; Anderson, A F

Publication Date:: Tue Jan 01 00:00:00 EST 1985

Research Org.:: Univ. of Chicago, IL (USA)

OSTI Identifier:: 6196147

Report Number(s):: CONF-8510489-
Journal ID: CODEN: GAAPB

Resource Type:: Conference

Journal Name:: Geol. Soc. Am., Abstr. Programs; (United States)

Additional Journal Information:: Journal Volume: 17; Conference: 98. annual meeting of the Geological Society of America, Orlando, FL, USA, 28 Oct 1985

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; GABBROS; CHEMICAL COMPOSITION; CRYSTALLOGRAPHY; MINERALOGY; HAWAII; AMORPHOUS STATE; CHEMICAL REACTION KINETICS; GEOCHEMISTRY; ION EXCHANGE; MAGMA; MAGMATISM; OLIVINE; PYROXENES; VOLCANOES; ALKALINE EARTH METAL COMPOUNDS; CHEMISTRY; FEDERAL REGION IX; IGNEOUS ROCKS; IRON COMPOUNDS; IRON SILICATES; KINETICS; MAGNESIUM COMPOUNDS; MAGNESIUM SILICATES; MINERALS; NORTH AMERICA; OXYGEN COMPOUNDS; PLUTONIC ROCKS; REACTION KINETICS; ROCKS; SILICATE MINERALS; SILICATES; SILICON COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; USA; 580300* - Mineralogy, Petrology, & Rock Mechanics- (-1989); 580400 - Geochemistry- (-1989)

Citation Formats


                    Schwindinger, K R, and Anderson, A F. Differentiation in the cumulates from a Mauna Loa, Hawaii magma chamber.  United States: N. p., 1985. 
        Web.

Copy to clipboard


                    Schwindinger, K R, & Anderson, A F. Differentiation in the cumulates from a Mauna Loa, Hawaii magma chamber.  United States.

Copy to clipboard


                    Schwindinger, K R, and Anderson, A F. 1985.  
        "Differentiation in the cumulates from a Mauna Loa, Hawaii magma chamber".  United States.

Copy to clipboard


                    
@article{osti_6196147,

  title        = {Differentiation in the cumulates from a Mauna Loa, Hawaii magma chamber},

  author       = {Schwindinger, K R and Anderson, A F},

  abstractNote = {The interstitial glass in cognate nodules from Mauna Loa, has by chemical diffusion or convective fluid transport, remained in equilibrium with the overlying magma. The glass bearing nodules were collected from Damona Cone on the southwest rift zone of Mauna Loas. The nodules have approximately 15% olivine, 40% orthopyroxene plus clinopyroxene (3-20%), and 85% plagioclase plus vescicular glass (2-25%). Olivine norites have anhedral olivine mantled with anhedral orthopyroxene, subhedral to euhedral pyroxene, anhedral plagioclase, and 20 to 25% glass. Olivine gabbros have anhedral olivine, subequant, anhedral to subhedral pyroxene and plagioclase and less than 10% glass. The bulk composition of greater than 15%, MgO, with the textures, indicate the nodules are an accumulative origin. Thus these nodules are partially solidified pieces of crystal/liquid accumulative mush. The compositions of the olivines are Fa 18 to 25 mole percent, of the plagioclases are An 70 to 80 mole percent. The composition of the orthopyroxene is En76 Fs19 Wo5, and of the clinopyroxene is En50 Fall Wo30. The composition of the interstitial glasses is: SiO2 52.54, TiO2 2.04, Al2O3 14.39, FeO 11.47, MgO 7.15, CaO 10.28, Na20 1.42, K2O 0.39, P2O5 0.21. The low Na2O is from two nodules that may have experienced high temperature alteration. The uniformity of the glass composition, in contrast to its large variation in the mode, suggests the interstitial liquid in the mush has remained in equilibrium with some large reservoir of MgO rich liquid, such as the magma above the mush. Two possible mechanisms of cation exchange between the magma and the interstitial liquid of the mush are chemical diffusion and convective fluid transport.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6196147},
  journal      = {Geol. Soc. Am., Abstr. Programs; (United States)},
number       = ,

  volume       = 17,

  place        = {United States},

  year         = {Tue Jan 01 00:00:00 EST 1985},

  month        = {Tue Jan 01 00:00:00 EST 1985}

}

Copy to clipboard

Conference:

Other availability

Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Evidence for a lower crustal origin of high-Al orthopyroxene megacrysts in Proterozoic anorthosites

Conference Wiebe, R - Geol. Soc. Am., Abstr. Programs; (United States)

Nodules and xenocrysts dominated by high-Al orthopyroxene (HAO) occur in strongly chilled Proterozoic basaltic dikes which cut the Nain anorthosite complex, Labrador. HAO (En 73-68, Al/sub 2/O/sub 3/ = 6.5-4.5) lacks exsolution; it occurs both as anhedral xenocrysts up to 10 cm in diameter and with euhedral plagioclase (An55) in ophitic nodules. Rarely, olivine occurs with HAO and Al-spinel with plagioclase. Scarce Fe-rich nodules contain: (1) opx + pig, (2) aug + pig, and (3) coarsely exsolved ulvospinel. Pyroxene pairs yield T's of 1250 to 1170/degree/C, whereas coexisting lamellae in exsolved ulvospinel yield T's between 1145 and 1120/degree/C, with fO/submore »« less
Gabbroic xenoliths from the northern Gorda Ridge: Implications for magma chamber processes under slow spreading centers

Journal Article Davis, A; Clague, D - Journal of Geophysical Research; (United States)

On the basis of textures and mineral compositions, the xenoliths are divided into five types: Type A xenoliths consist of large clinopyroxene oikocrysts, enclosing euhedral to subhedral plagioclase. Olivine and glass are present only in trace amounts. Type B xenoliths consist of olivine and plagioclase ({plus minus}spinel) with abundant intersertal glass. Partially resorbed olivine with deeply embayed margins in places subophitically encloses small plagioclase crystals. Olivine and large plagioclase crystals often contain glass inclusions and/or spinel. Type C xenoliths are a composite of types A and B, with areas of large clinopyroxene oikocrysts adjoining areas of loosely joined clusters ofmore »« less
https://doi.org/10.1029/JB095iB07p10885
Degassing history of water, sulfur, and carbon in submarine lavas from Kilauea Volcano, Hawaii

Journal Article Dixon, J; Stolper, E; Clague, D - Journal of Geology; (USA)

Major, minor, and dissolved volatile element concentrations were measured in tholeiitic glasses from the submarine portion (Puna Ridge) of the east rift zone of Kilauea Volcano, Hawaii. Dissolved H{sub 2}O and S concentrations display a wide range relative to nonvolatile incompatible elements at all depths. This range cannot be readily explained by fractional crystallization, degassing of H{sub 2}O and S during eruption on the seafloor, or source region heterogeneities. Dissolved CO{sub 2} concentrations, in contrast, show a positive correlation with eruption depth and typically agree within error with the solubility at that depth. The authors propose that most magmas alongmore »« less
https://doi.org/10.1086/629501
Low pressure fractionation in arc volcanoes: an example from Augustine Volcano, Alaska

Conference Daley, E; Swanson, S - Geol. Soc. Am., Abstr. Programs; (United States)

Augustine Volcano, situated between the Cook and Katmai segments of the Eastern Aleutian Volcanic Arc, has erupted 5 times since its discovery in 1778. Eruptions are characterized by early vent-clearing eruptions with accompanying pyroclastic flows followed by dome-building and more pyroclastic flows. Bulk rock chemistry of historic and prehistoric lavas shows little variability. The lavas are calc-alkaline, low to medium K, porphyritic acid andesites, rare basalt, and minor dacite pumice. FeO*/MgO averages 1.6 over this silica range. Plagioclase phenocrysts show complicated zoning patterns, but olivine, orthopyroxene, and clinopyroxene phenocrysts show little compositional variation. Hornblende, where present, is ubiquitously oxidized andmore »« less
Basaltic melt evolution of the Hengill volcanic system, SW Iceland, and evidence for clinopyroxene assimilation in primitive tholeiitic magmas

Journal Article Troennes, R - Journal of Geophysical Research; (USA)

The thick oceanic crust of Iceland is formed by tholeiitic central volcanoes arranged in en echelon patterns along the 40-50 km wide rift zones. The Hengill central volcano in the southwestern rift zone has produced 25-30 km{sup 3} of hyaloclastites and lava during the last 0.11 m.y., with maximum productivity during the isostatic rebound following the degalciations 0.13 and 0.01 m.y. ago. The petrographic relations of pillow rim and hyaloclastite glass indicate that the basaltic melts were saturated with olivine and plagioclase, except for the most primitive ones that were undersaturated with plagioclase. Saturation with clinopyroxene was reached in somemore »« less
https://doi.org/10.1029/JB095iB10p15893

Similar Records