43 results found
Belshaw NS, Freedman PA, O'Nions RK, et al., 1998, A new variable dispersion double-focusing plasma mass spectrometer with performance illustrated for Pb isotopes, INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, Vol: 181, Pages: 51-58, ISSN: 1387-3806
Frank M, O'Nions RK, 1998, Sources of Pb for Indian ocean ferromanganese crusts: a record of Himalayan erosion?, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 158, Pages: 121-130, ISSN: 0012-821X
McKenzie D, O'Nions RK, 1998, Melt production beneath oceanic islands, International Symposium on Role of Magmas on the Evolution of the Earth, Publisher: ELSEVIER SCIENCE BV, Pages: 143-182, ISSN: 0031-9201
Lollar BS, Ballentine CJ, O'Nions RK, 1998, Mantle derived carbon dioxide in the Pannonian Basin - Integration of rare gas and stable isotope signatures., ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 215, Pages: U623-U624, ISSN: 0065-7727
Zhu XK, O'Nions RK, Gibb AJ, 1998, SIMS analysis of U-Pb isotopes in monazite: Matrix effects, CHEMICAL GEOLOGY, Vol: 144, Pages: 305-312, ISSN: 0009-2541
O'Nions RK, Frank M, von Blanckenburg F, et al., 1998, Secular variation of Nd and Pb isotopes in ferromanganese crusts from the Atlantic, Indian and Pacific Oceans, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 155, Pages: 15-28, ISSN: 0012-821X
Dia AN, Cohen AS, O'Nions RK, et al., 1997, Rates of uplift investigated through Th-230 dating in the Gulf of Corinth (Greece) (vol 138, pg 171, 1997), CHEMICAL GEOLOGY, Vol: 143, Pages: 263-263, ISSN: 0009-2541
von Blanckenburg F, O'nions RK, Hein JR, 1996, Distribution and sources of pre-anthropogenic lead isotopes in deep ocean water from Fe-Mn crusts, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 60, Pages: 4957-4963, ISSN: 0016-7037
von Blanckenburg F, Belshaw NS, O'Nions RK, 1996, Separation of Be-9 and cosmogenic Be-10 from environmental materials and SIMS isotope dilution analysis, CHEMICAL GEOLOGY, Vol: 129, Pages: 93-99, ISSN: 0009-2541
von Blanckenburg F, O'Nions RK, Belshaw NS, et al., 1996, Global distribution of beryllium isotopes in deep ocean water as derived from Fe-Mn crusts, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 141, Pages: 213-226, ISSN: 0012-821X
BELSHAW NS, O'NIONS RK, VON BLANCKENBURG F, 1995, A SIMS METHOD FOR BE-10/BE-9 RATIO MEASUREMENT IN ENVIRONMENTAL MATERIALS, INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, Vol: 142, Pages: 55-67, ISSN: 1387-3806
Oxburgh ER, O'nions RK, 1987, Helium loss, tectonics, and the terrestrial heat budget., Science, Vol: 237, Pages: 1583-1588, ISSN: 0036-8075
It has been known for the last decade that primordial helium incorporated in Earth at the time of its formation is still being degassed during the formation of new ocean crust at spreading ocean ridges. It is now clear that somewhat contrary to expectation, substantial degassing is also taking place through the continental crust. In western Europe the escape of mantle volatiles seems to occur largely where the crust is undergoing active extension. Although it is known that melting is the principal process for extracting and concentrating helium from the mantle at ocean ridges, the equivalent subcontinental process remains poorly understood. The same elements that are responsible for most of Earth's radiogenic heating (uranium and thorium) are also responsible for the generation of radiogenic helium. The present rate of mantle heat loss, however, is out of equilibrium with the rate of helium loss-too large by about a factor of 20. Either radiogenic helium is accumulated in the mantle while heat escapes or current models for the bulk chemistry of Earth are in error and much of the terrestrial heat loss is nonradiogenic.
Carter SR, Evensen NM, Hamilton PJ, et al., 1978, Neodymium and strontium isotope evidence for crustal contamination of continental volcanics., Science, Vol: 202, Pages: 743-747, ISSN: 0036-8075
Combined neodymium and strontium isotope studies on Tertiary volcanics from northwest Scotland indicate that their parental mantle isotopic compositions have been substantially modified in many instances by contamination with the Precambrian continental crust through which they were erupted. The occurrence of samarium-neodymium and rubidium-strontium "pseudoisochrons" of different ages in these contaminated continental volcanics indicates that they are artifacts of the contamination processes and have no temporal significance with respect to mantle fractionation events.
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