Results 261 to 270 of about 5,732,959 (308)

Distribution and rare earth element abundances of apatite in Bennu samples determined by synchrotron X‐ray fluorescence spectroscopy

Meteoritics &Planetary Science, EarlyView.
Abstract Apatite is often the most rare earth element (REE)‐enriched mineral in chondritic meteorites. REE enrichment and fractionation levels in apatite grains can give insight into the aqueous fluids in which they formed and the conditions prevailing within the host body. In this study, we applied synchrotron X‐ray fluorescence (SXRF) spectroscopy to
B. J. Tkalcec, P. Tack, T. Baert, J. Herthogs, B. Vekemans, B. Bazi, E. De Pauw, M. Di Michiel, G. Falkenberg, J. Garrevoet, G. Libourel, M. Portail, V. Guigoz, C. Collin, H. C. Connolly Jr., D. S. Lauretta, L. Vincze, F. E. Brenker   +17 more
wiley   +1 more source

FROM SCANDINAVIA TO THE LEVANT: THE LATE BRONZE AGE METAL TRADE AND NURAGIC SARDINIA

Oxford Journal of Archaeology, EarlyView.
Summary A growing body of evidence suggests that Nuragic Sardinia played a role, as yet poorly understood, in the metal trade between Scandinavia, Atlantic Europe, and the Mediterranean during the Bronze Age. Provenance studies based on lead isotope and chemical analyses of copper‐based – and to a minor extent lead – artefacts from both continental ...
Serena Sabatini
wiley   +1 more source

Impacts of reclamation approaches on plant establishment in an arid environment during copper mine revegetation

Restoration Ecology, EarlyView.
Abstract Introduction Revegetation using native vegetation is a commonly used technique to reclaim landscapes degraded by mining activities. Revegetation efforts in the arid Southwestern United States face physical, geochemical, hydrological, and biological challenges unique to drylands.
Sierra T. Lauman, Catherine G. Fontana, Elise S. Gornish, Julia W. Neilson   +3 more
wiley   +1 more source

Geological and geochemical characteristics of large gas fields in China

Petroleum Exploration and Development, 2014
Based on a comprehensive analysis, the geological and geochemical characteristics of large gas fields in China were summarized in this paper. By the end of 2011, altogether 48 large gas fields had been discovered in China, with their proven reserves ...
Shipeng Huang, Chenchen Fang, Deyu Gong
exaly   +2 more sources

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Geochemical characteristics of Cretaceous carbonatites from Angola

Journal of African Earth Sciences, 1999
Abstract The Early Cretaceous (138–130 Ma) carbonatites and associated alkaline rocks of Angola belong to the Parana-Angola-Etendeka Province and occur as ring complexes and other central-type intrusions along northeast trending tectonic lineaments, parallel to the trend of coeval Namibian alkaline complexes.
A. Alberti, CASTORINA, Francesca, P. Censi, P. Comin Chiaramonti, C. B. Gomes   +4 more
openaire   +3 more sources

Geochemical characteristics of collision-zone magmatism

Geological Society, London, Special Publications, 1986
Summary This paper reports the results of a systematic geochemical study of intermediate and acid intrusive rocks from a number of continent-continent collision zones of Phanerozoic age. Four groups of intrusions can be recognized, each associated with a particular stage in the tectonic evolution of a collision zone.
Nigel B. W. Harris, Julian A. Pearce, Andrew G. Tindle   +2 more
openaire   +1 more source

Geochemical Characteristics of Carbonatites

Nature, 1962
THE lava from Fort Portal in western Uganda, recently described by von Knorring and Du Bois1, was considered to be carbonatitic in view of the high carbonate content and its agreement with the characteristic trace element pattern as observed among true carbonatites, which are in the main calcitic or dolomitic rocks.
openaire   +1 more source

Petrographical and Geochemical Characteristics of the Mauritanides Belts’ Birbirites

2019
The Gouerarate region represents the most important area of birbirites’ outcrops, sited in the Mauritanides Belts. In this paper, the petrological description of such facies is highlighted. The Gouerarate Birbirites are mainly composed of silica (chalcedony and microquartz) and talc, geochemically characterized with high SiO2 level (up to 80%).
Ould-Moctar, Didi, Moukadiri, Ali, Boushaba, Abdellah, Ould-Mohamed-Lemine, Sid’ahmed, Dubois, Michel   +4 more
openaire   +2 more sources

HYDROGEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF THE STRIPA SITE

1981
ABSTRACT The Stripa mine test site, located approximately 200 km west-northwest of Stockholm, Sweden, is the focal point of a detailed fracture-hydrology study. Preliminary results from three of the five main components of this program are discussed in this paper.
J.E. Gale, P. Fritz, P.A. Witherspoon, J. Barker, C. Wilson   +4 more
openaire   +1 more source

Geochemical characteristics of Kau Bay water

Netherlands Journal of Sea Research, 1989
Water in Kau Bay (Halmahera, Indonesia) differs chemically and physically from the water in the adjacent Pacific Ocean. Ventilation of the bay, with a maximum depth of 480 metre, is restricted by the presence of a sill at the entrance of the bay at a depth of 40 metre.
Cornelis H. van der Weijden, Gert J. de Lange, Jack J. Middelburg, Hans A. van der Sloot, Dirk Hoede, Siti Shofiyah   +5 more
openaire   +1 more source