Petrogenesis of a Phonolite-Trachyte Succession at Mount Sidley, Marie Byrd Land, Antarctica

PANTER, K

doi:10.1093/petrology/38.9.1225

Cited by 36 publications

(20 citation statements)

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“…The lineage will be either quartz-or nepheline-normative, as is seen in Phase II and elsewhere (Panter et al 1997;Coombs et al 2008). At Mount Morning eruptive center, felsic rocks were erupted over most of the 7.3 m.y.…”

Section: Evolution Of the Mount Morning Eruptive Centermentioning

confidence: 96%

Geochronology of Mount Morning, Antarctica: two-phase evolution of a long-lived trachyte-basanite-phonolite eruptive center

2009

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Mount Morning is a Cenozoic, alkaline eruptive center in the south-west Ross Sea, Antarctica. New ages on 17 Mount Morning volcanic rocks (combined with 34 existing ages) allows division of Mount Morning volcanism into two phases, erupted between at least 18.7 Ma and 11.4 Ma, and 6.13 and 0.02 Ma. The position of Mount Morning on the active West Antarctic Rift System within the stationary Antarctic plate is a key factor in the eruptive center's longevity. The earliest, mildly alkaline, Phase I volcanism comprises predominantly trachytic rocks produced by combined assimilation and fractional crystallization processes over 7.3 m.y. Strongly alkaline Phase II volcanism is dominated by a basanite -phonolite lineage, with the youngest (post last glacial maximum) activity dominated by small volume primitive basanite eruptions. The evolution from mildly to strongly alkaline chemistry between phases reflects magma residence time in the crust, the degree of mantle melting, or the degree of magmacountry-rock interaction. Phase I magmatism occurred over a comparable area to the present-day, Phase II shield. The 5.2 m.y. volcanic hiatus separating Phase I and II coincides with a cycle of eruption and glacial erosion at the nearby Minna Bluff eruptive center. Mount Morning is the likely source of volcanic detritus in Cape Roberts drill-core (about 24.1 to 18.4 Ma) and in ANDRILL drill-hole 1B (about 13.6 Ma), located 170 km north and 105 km north-east respectively, of Mount Morning. Based upon the timing of eruptions and high heat-flow, Mount Morning should be considered a dormant volcano.

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Section: Evolution Of the Mount Morning Eruptive Centermentioning

confidence: 96%

Geochronology of Mount Morning, Antarctica: two-phase evolution of a long-lived trachyte-basanite-phonolite eruptive center

2009

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“…In their model, Figure 6. Primitive mantle normalized [McDonough and Sun, 1995] multielement diagram comparing mean values of continental alkaline basalts from West Antarctica Panter et al, 1997bPanter et al, , 2000Panter et al, , 2003Rocchi et al, 2002a;Rocholl et al, 1995], Australia and Tasmania [Ewart et al, 1988;McBride et al, 2001;McDonough et al, 1985], and southern New Zealand Panter et al, 1997a]. Also shown are oceanic samples that represent average HIMU end-member compositions Hart, 1993, 1997;Woodhead, 1996], MORB from the Pacific-Antarctic ocean ridge system [Ferguson and Klein, 1993], and three ''near primitive'' glasses from Macquarie Island, an uplifted block of oceanic crust at the Australia Pacific plate boundary south of New Zealand [Kamenetsky et al, 2000].…”

Section: Key Characteristics Of the Cenozoic Sw Pacific Diffuse Alkalmentioning

confidence: 99%

A Cenozoic diffuse alkaline magmatic province (DAMP) in the southwest Pacific without rift or plume origin

Finn

Müller

Panter

2005

Geochem Geophys Geosyst

156

125

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[1] Common geological, geochemical, and geophysical characteristics of continental fragments of East Gondwana and adjacent oceanic lithosphere define a long-lived, low-volume, diffuse alkaline magmatic province (DAMP) encompassing the easternmost part of the Indo-Australian Plate, West Antarctica, and the southwest portion of the Pacific Plate. A key to generating the Cenozoic magmatism is the combination of metasomatized lithosphere underlain by mantle at only slightly elevated temperatures, in contrast to large igneous provinces where mantle temperatures are presumed to be high. The SW Pacific DAMP magmatism has been conjecturally linked to rifting, strike-slip faulting, mantle plumes, or hundreds of hot spots, but all of these associations have flaws. We suggest instead that sudden detachment and sinking of subducted slabs in the late Cretaceous induced Rayleigh-Taylor instabilities along the former Gondwana margin that in turn triggered lateral and vertical flow of warm Pacific mantle. The interaction of the warm mantle with metasomatized subcontinental lithosphere that characterizes much of the SW Pacific DAMP concentrates magmatism along zones of weakness. The model may also provide a mechanism for warming south Pacific mantle and resulting Cenozoic alkaline magmatism, where the oceanic areas are characterized primarily, but not exclusively, by short-lived hot spot tracks not readily explained by conventional mantle plume theory. This proposed south Pacific DAMP is much larger and longer-lived than previously considered.

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“…Mg# values Mg# ¼molar Mg= Mg þ Fe tot þ Mn ð Þ ½ of rocks in equilibrium with such Mg-rich clinopyroxenes should be~0.60-0.73, whereas BM trachytes always have Mg# <0.50;-the presence of bytownitic plagioclase, which likely represents a xenocryst phase given its corroded rims, the unrealistic results obtained from ternary feldspar geothermometers (as low as 100-300°C at 1 kbar;Fuhrman and Lindsley 1988) and the substantial lack of literature evidences for trachytes showing Ca-rich plagioclases (e.g Panter et al 1997;Schreiber et al 1999…”

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confidence: 99%

The Breccia Museo formation, Campi Flegrei, southern Italy: geochronology, chemostratigraphy and relationship with the Campanian Ignimbrite eruption

Scarpati²,

et al. 2008

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The Breccia Museo is one of the most debated volcanic formations of the Campi Flegrei volcanic district. The deposit, made up of six distinctive stratigraphic units, has been interpreted by some as the proximal facies of the major caldera-forming Campanian Ignimbrite eruption, and by others as the product of several, more recent, independent and localized events. New geochemical and chemostratigraphical data and Ar-Ar age determinations for several units of the Breccia Museo deposits (~39 ka), correlate well with the Campanian Ignimbrite-forming eruption. The chemical zoning of the Breccia Museo deposits is interpreted here to be a consequence of a three-stage event that tapped a vertically zoned trachytic magma chamber.

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Petrogenesis of a Phonolite-Trachyte Succession at Mount Sidley, Marie Byrd Land, Antarctica

Cited by 36 publications

References 0 publications

Geochronology of Mount Morning, Antarctica: two-phase evolution of a long-lived trachyte-basanite-phonolite eruptive center

Geochronology of Mount Morning, Antarctica: two-phase evolution of a long-lived trachyte-basanite-phonolite eruptive center

A Cenozoic diffuse alkaline magmatic province (DAMP) in the southwest Pacific without rift or plume origin

The Breccia Museo formation, Campi Flegrei, southern Italy: geochronology, chemostratigraphy and relationship with the Campanian Ignimbrite eruption

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