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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Madagascar (1)
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North Africa
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Egypt (1)
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Antarctica
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International Ocean Discovery Program
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Expedition 352
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Oceania
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Hawaii
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Pacific Coast (1)
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O-18/O-16 (3)
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Pb-206/Pb-204 (8)
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Pb-208/Pb-204 (7)
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gold (3)
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iron
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Mesozoic
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Upper Carboniferous (2)
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Permian
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Talladega Group (1)
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Purcell System (1)
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upper Precambrian
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Paleoproterozoic
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igneous rocks
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porphyry (2)
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volcanic rocks
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basalts
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flood basalts (5)
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ocean-island basalts (7)
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tholeiitic basalt (114)
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basanite
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glasses
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trachytes (3)
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ophiolite (6)
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metamorphic rocks
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gneisses
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metasedimentary rocks
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metasomatic rocks
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framework silicates
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ring silicates
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Primary terms
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absolute age (27)
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Africa
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Paleogene
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Deep Sea Drilling Project
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IPOD
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Leg 62
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DSDP Site 466 (1)
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Leg 64 (1)
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Leg 65 (1)
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Leg 32
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Leg 33
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DSDP Site 317 (1)
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deformation (2)
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porphyry (2)
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volcanic rocks
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basalts
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flood basalts (5)
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tholeiitic basalt (114)
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basanite
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glasses
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komatiite (3)
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inclusions
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Indian Ocean (1)
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intrusions (22)
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isotopes
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stable isotopes
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Ar-40/Ar-39 (2)
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Nd-144/Nd-143 (17)
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O-18/O-16 (3)
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Pb-206/Pb-204 (8)
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Pb-207/Pb-204 (8)
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Pb-208/Pb-204 (7)
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Rb-87/Sr-86 (1)
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lava (36)
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Mesozoic
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Cretaceous
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Maestrichtian
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Senonian (1)
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Great Valley Sequence (1)
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Jurassic
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lower Mesozoic (1)
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metal ores
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Rb-87/Sr-86 (1)
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Sr-87/Sr-86 (15)
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gold (3)
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hafnium
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Hf-177/Hf-176 (1)
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iron
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lead
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Nd-144/Nd-143 (17)
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Sm-147/Nd-144 (2)
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samarium
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Sm-147/Nd-144 (2)
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Mexico
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North America
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Intermontane Belt (1)
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Rocky Mountains
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Ocean Drilling Program
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Leg 115
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ODP Site 706 (1)
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ODP Site 715 (1)
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ocean floors (9)
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Oceania
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Mauna Loa (1)
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oceanography (1)
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orogeny (2)
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oxygen
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O-18/O-16 (3)
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Pacific Coast (1)
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Southeast Pacific
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North Pacific
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Northwest Pacific
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South Pacific
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West Pacific
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Ontong Java Plateau (1)
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Pacific region (1)
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paleogeography (3)
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Paleozoic
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Cambrian
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Carboniferous
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Upper Carboniferous (2)
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Permian
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Talladega Group (1)
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petrology (17)
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Precambrian
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Purcell System (1)
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upper Precambrian
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Proterozoic
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Mesoproterozoic
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Aldridge Formation (1)
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Neoproterozoic
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Paleoproterozoic
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reefs (1)
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sea-floor spreading (6)
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volcaniclastics (5)
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sedimentary structures
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soft sediment deformation
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-
-
-
sediments
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sediments
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marine sediments (2)
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volcaniclastics (5)
-
tholeiitic basalt
Formation and evolution of a magmatic system in the Indian passive margin: Insights from the Triassic Yumai Complex from the eastern Tethyan Himalaya
The Ludicovian of the Raahe–Ladoga Zone of the Fennoscandian Shield (Isotope-Geochemical Composition and Geodynamic Nature)
Platinum Group Elements in the South Transbaikalian Basanites (First Data)
Abstract Two small monogenetic volcanoes are exposed at Mount Early and Sheridan Bluff, in the upper reaches of Scott Glacier. In addition, the presence of abundant fresh volcanic detritus in moraines at two other localities suggests further associated volcanism, now obscured by the modern Antarctic ice sheet. One of those occurrences has been attributed to a small subglacial volcano only c. 200 km from South Pole, making it the southernmost volcano in the world. All of the volcanic outcrops in the Scott Glacier region are grouped in a newly defined Upper Scott Glacier Volcanic Field, which is part of the McMurdo Volcanic Group (Western Ross Supergroup). The volcanism is early Miocene in age ( c. 25–16 Ma), and the combination of tholeiitic and alkaline mafic compositions differs from the more voluminous alkaline volcanism in the West Antarctic Rift System. The Mount Early volcano was erupted subglacially, when the contemporary ice was considerably thicker than present. By contrast, lithologies associated with the southernmost volcano, currently covered by 1.5 km of modern ice, indicate that it was erupted when any associated ice was either much thinner or absent. The eruptive setting for Sheridan Bluff is uncertain and is still being investigated.
Abstract This study discusses the petrological and geochemical features of two monogenetic Miocene volcanoes, Mount Early and Sheridan Bluff, which are the above-ice expressions of Earth's southernmost volcanic field located at c. 87° S on the East Antarctic Craton. Their geochemistry is compared to basalts from the West Antarctic Rift System to test affiliation and resolve mantle sources and cause of melting beneath East Antarctica. Basaltic lavas and dykes are olivine-phyric and comprise alkaline (hawaiite and mugearite) and subalkaline (tholeiite) types. Trace element abundances and ratios (e.g. La/Yb, Nb/Y, Zr/Y) of alkaline compositions resemble basalts from the West Antarctic rift and ocean islands (OIB), while tholeiites are relatively depleted and approach the concentrations levels of enriched mid-ocean ridge basalt (E-MORB). The magmas evolved by fractional crystallization with contamination by crust; however, neither process can adequately explain the contemporaneous eruption of hawaiite and tholeiite at Sheridan Bluff. Our preferred scenario is that primary magmas of each type were produced by different degrees of partial melting from a compositionally similar mantle source. The nearly simultaneous generation of lower degrees of melting to produce alkaline types and higher degrees of melting forming tholeiite was most likely to have been facilitated by the detachment and dehydration of metasomatized mantle lithosphere.