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Timing and composition of continental volcanism at Harrat Hutaymah, western Saudi Arabia

Creator:: Duncan, Robert A., Kent, Adam J.R., Thornber, Carl R., Schlieder, Tyler D., and Al-Amri, Abdullah M.
Abstract:: Harrat Hutaymah is an alkali basalt volcanic field in north-central Saudi Arabia, at the eastern margin of a large Neogene continental, intraplate magmatic province. Lava flow, tephra and spatter cone compositions in the field include alkali olivine basalts and basanites. These compositions contrast with the predominantly tholeiitic, fissure-fed basalts found...
Resource Type:: Article

Stratigraphy and age of the Eocene Igtertivâ Formation basalts, alkaline pebbles and sediments of the Kap Dalton Group in the graben at Kap Dalton, East Greenland

Creator:: Larsen, Lotte M., Pedersen, Asger K., Sorensen, Erik Vest, Watt, W. Stuart, and Duncan, Robert A.
Abstract:: A NE–SW-trending graben at Kap Dalton on the Blosseville Kyst contains an at least 600 m thick succession of Eocene basalt lavas and sediments. The succession has been investigated by new field work, geochemical analysis and radiometric dating by the ⁴⁰Ar-³⁹Ar incremental heating method. The results show that the volcanic...
Resource Type:: Article
Full Text:: files 2 and 3. 43.77 ± 1.08 Ma 20 25 30 35 40 45 50 55 60 65 70 0 10 20 30 40 50 60 70 80

Radiometric dating of Young MORB using the ⁴⁰Ar-³⁹Ar incremental heating method

Creator:: Duncan, Robert A. and Hogan, L. G.
Abstract:: Determination of reliable crystallization ages by K-Ar methods for young (<1 Ma), fresh basalts from the seafloor has been frustrated by several effects. The small amounts of radiogenic ⁴⁰Ar developed over these timescales in such low-K rocks are difficult to resolve from predominantly atmospheric ⁴⁰Ar. An additional concern is that...
Resource Type:: Article
Full Text:: significantly more radiogenic 4øAr released in between. The 900øC step yielded 70-80% radiogenic 4øAr. Hence

Five million years of compositionally diverse, episodic volcanism : construction of Davidson Seamount atop an abandoned spreading center

Creator:: Clague, D. A., Paduan, J. B., Duncan, Robert A., Huard, J. J., Davis, A. S., Castillo, P. R., Lonsdale, P., and DeVogelaere
Abstract:: Davidson Seamount, a volcano located about 80 km off the central California coast, has a volume of ~320 km³ and consists of a series of parallel ridges serrated with steep cones. Davidson was sampled and its morphology observed during 27 ROV Tiburon dives. During those dives, 286 samples of lava,...
Resource Type:: Article
Full Text:: 80 km off the central California coast, has a volume of �320 km3 and consists of a series of parallel

Implications of a nonlinear ⁴⁰Ar/³⁹Ar age progression along the Louisville seamount trail for models of fixed and moving hot spots

Creator:: Koppers, Anthony A. P., Duncan, Robert A., and Steinberger, Bernhard
Abstract:: The Louisville seamount trail has been recognized as one of the key examples of hot spot volcanism, comparable to the classic volcanic Hawaiian-Emperor lineaments. The published total fusion ⁴⁰Ar/³⁹Ar data of Watts et al. [1988] showed an astonishing linear age progression, firmly establishing Louisville as a fixed hot spot in...
Resource Type:: Article
Full Text:: � paleolatitudinal shift observed by Tarduno et al. [2003] for the Hawaiian hot spot between 80 and 47 Ma. If the

Origin of the Louisville ridge and its relationship to the Eltanin Fracture Zone System

Creator:: Watts, A. B., Weissel, J. K., Duncan, Robert A., and Larson, R. L.
Abstract:: We have combined shipboard and Seasat altimeter derived data in an intergrated geological and geophysical study of the Louisville Ridge; a 3500-km-long seamount chain extending from the Tonga trench to the Eltanin Fracture Zone. A break in the smooth trend of the ridge at latitude 37.5°S has been recognized in...
Resource Type:: Article
Full Text:: developed on this transform between 60 and 80 Ma, prior to the oldest dated rocks from the ridge. Although

New ⁴⁰Ar/³⁹Ar age progression for the Louisville hot spot trail and implications for inter–hot spot motion

Creator:: Koppers, Anthony A. P., Gowen, Molly D., Colwell, Lauren E., Gee, Jeffrey S., Lonsdale, Peter F., Mahoney, John J., and Duncan, Robert A.
Abstract:: In this study we present 42 new ⁴⁰Ar/³⁹Ar incremental heating age determinations updated age progression for the Louisville seamount trail. Louisville is the South Hawaiian‐Emperor seamount trail, both trails representing intraplate volcanism (~80 Ma to present) and being examples of primary hot spot lineaments. Our age‐progressive trend from 71 to...
Resource Type:: Article
Full Text:: trails representing intraplate volcanism over the same time interval (∼80 Ma to present) and being

Precise dating of the Holmatindur cooling event in eastern Iceland: Evidence for mid-Miocene bipolar glaciation

Creator:: Duncan, Robert A. and Helgason, J.
Abstract:: A succession of basaltic lavas, volcaniclastic sediments, and lignite beds in the Holmatindur region of eastern Iceland provides the means for tying magnetic reversal stratigraphy and a record of major North Atlantic cooling to a precise radiometric timescale. A prominent part of the section is the Holmatindur classic bed, which...
Resource Type:: Article
Full Text:: is the Holmatindur clastic bed, which is up to 66 m thick and can be traced 80 km along strike. The

Geochronology of Galapagos seamounts

Creator:: Sinton, Christopher W., Christie, David M., and Duncan, Robert A.
Abstract:: Lavas from seamounts of the central Galápagos Platform and the Carnegie Ridge increase in age with distance from the western edge of the platform, consistent with a hotspot model for the generation of these features. The areal distribution of seamount ages suggests that the pattern of dispersed volcanism seen on...
Resource Type:: Article
Full Text:: 09.70'W PL4-19 00 ø 55.92'S 7 ø 07.46'W PL5-01 01 o 17.40'S 88 ø 21.20'W PL8-01 01 ø 17.40'S 88

Geochemistry and geochronology of ancient southeast Indian and southwest Pacific seafloor

Creator:: Pyle, D. G., Christie, David M., Mahoney, J. J., and Duncan, Robert A.
Abstract:: Within the Australian-Antarctic Discordance (AAD), a boundary exists between isotopically defined “Pacific-type” and “Indian-type” mid-ocean ridge basalt (MORB) erupted along the Southeast Indian Ridge (SEIR). This boundary has migrated westward beneath the easternmost AAD spreading segment at a minimum rate of 25 mm/yr since 4 Ma; however, its long-term history...
Resource Type:: Article
Full Text:: 62 140 115 69 159 Cu 16 50 54 54 56 70 77 97 73 100 76 59 122 Zn 91 81 80 109 111 75 75 95 102 70

ScholarsArchive@OSU

Timing and composition of continental volcanism at Harrat Hutaymah, western Saudi Arabia

Stratigraphy and age of the Eocene Igtertivâ Formation basalts, alkaline pebbles and sediments of the Kap Dalton Group in the graben at Kap Dalton, East Greenland

Radiometric dating of Young MORB using the ⁴⁰Ar-³⁹Ar incremental heating method

Five million years of compositionally diverse, episodic volcanism : construction of Davidson Seamount atop an abandoned spreading center

Implications of a nonlinear ⁴⁰Ar/³⁹Ar age progression along the Louisville seamount trail for models of fixed and moving hot spots

Origin of the Louisville ridge and its relationship to the Eltanin Fracture Zone System

New ⁴⁰Ar/³⁹Ar age progression for the Louisville hot spot trail and implications for inter–hot spot motion

Precise dating of the Holmatindur cooling event in eastern Iceland: Evidence for mid-Miocene bipolar glaciation

Geochronology of Galapagos seamounts

Geochemistry and geochronology of ancient southeast Indian and southwest Pacific seafloor

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