Výsledky vyhledávání - "Hugh T. Millard"

Iridium content of basaltic tuffs and enclosing black shales of the balder formation, North Sea

Autor: W. Crawford Elliott, Hugh T. Millard, James L. Aronson

Publikováno v: Geochimica et Cosmochimica Acta. 56:2955-2961

The anomalous levels of Ir and the presence of shocked metamorphosed quartz deposited at the Cretaceous/Tertiary (K/T) boundary worldwide is strong evidence that a meteorite impact took place during the K/T boundary interval. However, because of obse

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bd596fc388952b49bb45df5c33e57112
https://doi.org/10.1016/0016-7037(92)90373-q

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Osmium, ruthenium, iridium and uranium in silicates and chromite from the eastern Bushveld Complex, South Africa

Autor: A.J. Bartel, George A. Desborough, R.h Gijbels, Hugh T. Millard

Publikováno v: Geochimica et Cosmochimica Acta. 38:319-337

Osmium, ruthenium, iridium and uranium contents were determined in eight ortho pyroxene, seven plagioclase, and three chromite mineral separates from the eastern Bushveld Complex. Neutron activation analysis was used to measure the platinum metals, a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6e452587311b21e611716b55fec162e2
https://doi.org/10.1016/0016-7037(74)90113-6

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The distribution of uranium and thorium in granitic rocks of the basin and range province, Western United States

Autor: Hugh T. Millard, James M. McNeal, Donald E. Lee

Publikováno v: Journal of Geochemical Exploration. 14:25-40

Some secondary uranium deposits are thought to have formed from uranium derived by the weathering of silicic igneous rocks such as granites, rhyolites, and tuffs. A regional geochemical survey was made to determine the distribution of uranium and tho

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::97e70c6b11bf792a967fbcadaa4856b4
https://doi.org/10.1016/0375-6742(81)90101-1

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Deep-sea spherules from Pacific clay: mass distribution and influx rate

Autor: Hugh T. Millard, K. Nishiizumi, P. A. Davis, M. T. Murrell

Publikováno v: Geochimica et Cosmochimica Acta. 44:2067-2074

From 411 kg of Pacific clay, 22 mg of stony spherules and 50 mg of iron spherules larger than 150 microns were concentrated. The extraterrestrial origin of these particles was evaluated with the aid of optical and electron microscopy and atomic absor

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0e8e9a8dd18c73b3de94d4208f684062
https://doi.org/10.1016/0016-7037(80)90204-5

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The origin of the clay minerals at the Cretaceous /Tertiary boundary in Denmark

Autor: James L. Aronson, Elizabeth Gierlowski-Kordesch, Hugh T. Millard, W. Crawford Elliott

Publikováno v: Geological Society of America Bulletin. 101:702-710

The distinctive Mg-smectite that is the predominant clay mineral in the Cretaceous/ Tertiary (K/T) boundary marl at Stevns Klint, Denmark (that is, the Fish Clay), which has been previously believed to have formed from impact-derived glass, is also p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c4bd2ba20c2cb67fe73046f1264be487
https://doi.org/10.1130/0016-7606(1989)101<0702:tootcm>2.3.co

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The rate of arrival of meteorites at the surface of the Earth

Autor: Hugh T. Millard

Publikováno v: Journal of Geophysical Research. 68:4297-4303

A model for meteorite recovery was developed to which population statistics for the eastern United States, Europe, Japan, and northern India were applied. The results indicate that the average minimum meteorite flux density reaching the surface of th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::25042b21baf91d2712057072cd4c3438
https://doi.org/10.1029/jz068i014p04297

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