Fluid Interaction and Geochemical Mobility in Metabasalts: An Example from the Central Appalachians

Badger, Robert L.

doi:10.1086/648197

Cited by 9 publications

(7 citation statements)

References 4 publications

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“…However, careful analysis of such rocks has led to recognition of which cations are least likely to have been mobilized, and thus provide the most reliable indicators of original magmatic compositions (e.g., Pearce and Cann, 1973;Floyd and Winchester, 1975). A method for this type of analysis has been worked out for the Catoctin samples in this study (Badger, 1993a), and is summarized as follows.…”

Section: Chemical Mobilitymentioning

confidence: 99%

“…15, A and B) plot in the within-plate tholeiite field, as representatives of the Catoctin magmas, the ten least altered samples were selected. The selection criteria used were retention of igneous clinopyroxene and igneous textures, and, for all but two, analysis of multiple samples from an individual flow (see discussion in Badger, 1993a).…”

Section: Characterization Of Sourcementioning

confidence: 99%

See 1 more Smart Citation

Geochemical stratigraphy and petrogenesis of the Catoctin volcanic province, central Appalachians

Badger¹,

Sinha²

2004

Memoir 197: Proterozoic Tectonic Evolution of the Grenville Orogen in North America

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Section: Chemical Mobilitymentioning

confidence: 99%

Section: Characterization Of Sourcementioning

confidence: 99%

Geochemical stratigraphy and petrogenesis of the Catoctin volcanic province, central Appalachians

Badger¹,

Sinha²

2004

Memoir 197: Proterozoic Tectonic Evolution of the Grenville Orogen in North America

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“…More recent work by Badger and Sinha (1988) and Badger (1993) established the age of the Catoctin at 570 ma and provided new information on the chemistry and origin of these rocks. The chemistry of these rocks is least altered in the dikes, is typical of tholeiite basalts with moderately high titanium content, and is similar to the chemistry of large, extensive plateau basalts.…”

Section: Bedrock Geologymentioning

confidence: 99%

Surficial geology of Shaver Hollow, Shenandoah National Park

Morgan¹

1998

Open-File Report

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“…Our data neither confirm nor refute this view, but are consistent with the formation and closure of an oceanic basin of some description between the time of the Grenville orogeny ( 1.1 Ga) and collisional events in the Ordovician. Evidence for enriched parental magmas at Buck Creek suggest a link between these crustal rocks and Late Precambrian volcanic associations of the Catoctin, Mount Rogers and Grandfather Mountain formations, which all preserve strongly enriched alkaline basaltic lavas associated with the opening of the Iapetus ocean basin (Rankin, 1976;Badger, 1993;Hernandez et al, 1994;Fetter & Goldberg, 1995).…”

Section: Whole-rock Geochemistrymentioning

confidence: 99%

Petrogenesis of sapphirine‐bearing metatroctolites from the Buck Creek ultramafic body, southern Appalachians

Tenthorey

Ryan

Snow

1996

Journal Metamorphic Geology

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The Buck Creek ultramafic body, North Carolina, includes aluminous lenses that have been described as troctolites. These lenses preserve mineral assemblages which record several different stages of metamorphism. The first stage is characterized by anhydrous reactions between olivine and plagioclase to produce coronas of orthopyroxene+ clinopyroxene/spinel symplectite. Thermo barometric results indicate minimum pressures of c. 6 kbar and c. 800 oC. Sapphirine replaces spinel in some clinopyroxene symplectites, and occurs as anhedral grains within amphibole, observations which in combination suggest peak metamorphic conditions of c. 9‐10 kbar and c. 850 oC. Sapphirine‐bearing hydrous assemblages formed at the expense of the coronas, indicating a second metamorphic episode involving deeper burial, deformation and hydration. Schistose rocks from the margins of the lenses are composed of anorthite+amphibole+margarite+corundum, and probably record a later, lower P‐T event. Whole rock analyses for the Buck Creek lenses suggest an accumulate protolith of magnesian olivine and calcic plagioclase. Trace element data for the troctolites are consistent with data for adjacent amphibolites in suggesting that the Buck Creek mafic and ultramafic cumulates crystallized from magmas derived from a mantle source similar to that which produces modern intraplate or rift‐related basalts. We propose that the Buck Creek ultramafics represent basal cumulates(± uppermost mantle) from ocean crust formed in a marginal basin in the latest Precambrian. Subduction‐induced burial to at least 18 km under dry conditions induced corona formation. Collisional events of the Taconic orogeny thrust the Buck Creek rocks into the orogenic pile to at least 30 km depth and hydrated them along zones of weakness, locally producing P‐T ‐PH2O conditions appropriate for formation of sapphirine and hydrated assemblages, but still preserving some dry symplectites.

show abstract

Fluid Interaction and Geochemical Mobility in Metabasalts: An Example from the Central Appalachians

Cited by 9 publications

References 4 publications

Geochemical stratigraphy and petrogenesis of the Catoctin volcanic province, central Appalachians

Geochemical stratigraphy and petrogenesis of the Catoctin volcanic province, central Appalachians

Surficial geology of Shaver Hollow, Shenandoah National Park

Petrogenesis of sapphirine‐bearing metatroctolites from the Buck Creek ultramafic body, southern Appalachians

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