Results 131 to 140 of about 259 (166)

Morphological observations on some fleshy crustose algae of the Island of Gorgona (Tuscan Archipelago)

Giornale Botanico Italiano (Florence, Italy: 1962), 1992
Abstract Morphological and ecological observations on four fleshy crustose algae collected in the eulittoral and upper sublittoral zone of the Island of Gorgona: Myrionema liechtenstenii Hauck, Hildenbrandia canariensis B⊘rgesen, Peyssonnelia armorica (P. et H. Crouan) Weber-van Bosse in B⊘rgesen and Cruoria cruoriaeformis (P. et H. Crouan) Denizot are
Gianfranco Sartoni
exaly   +2 more sources

Pb isotopes of Gorgona Island (Colombia): isotopic variations correlated with magma type

Earth and Planetary Science Letters, 1984
Abstract Lead isotopic results obtained on komatiites and basalts from Gorgona Island provide evidence of large isotopic variations within a restricted area (8 × 2.5 km). The variations are correlated with differences in volcanic rock type. The highest isotopic ratios ( 206 Pb/ 204 Pb∼ 19.75 ) correspond to tholeiites which make up most of the ...
B Dupré
exaly   +2 more sources

Implications of 187Os isotopic heterogeneities in a mantle plume: evidence from Gorgona Island and Curaçao

Geochimica Et Cosmochimica Acta, 1999
Recent work has suggested that the mafic-ultramafic volcanism in evidence throughout portions of the Caribbean, Central America, and northern South America, including the islands of Gorgona and Curacao, was generated as part of a middle-Cretaceous, large igneous province.
Andrew C Kerr, Michael Storey, Richard Walker   +2 more
exaly   +2 more sources

Noble metal abundances in komatiite suites from Alexo, Ontario and Gorgona Island, Colombia

Geochimica Et Cosmochimica Acta, 1987
Abstract The distribution of the chalcophile and siderophile metals Cu, Ni, Au, Pd, Ir, Os and Ru in an Archaean komatiite flow from Alexo, Ontario and in a Phanerozoic komatiitic suite of Gorgona Island, Colombia, provides new information about the geochemical behaviour of these elements. Copper, Au and Pd behave as incompatible elements during the
N T Arndt, A W Hofmann
exaly   +2 more sources

Petrology and geochemistry of komatiites and tholeiites from Gorgona Island, Colombia

Contributions to Mineralogy and Petrology, 1984
Komatiitic rocks from Gorgona Island, Colombia, in contrast to their Archaean counterparts, occur as rather structureless flows. In addition, textural and mineralogical features indicate that the Gorgona komatiites may have crystallized from superheated liquids.
Bruce G. Aitken, Lina M. Echeverr�a
openaire   +1 more source

First Record Of The Order Mecoptera (Insecta) For The Gorgona Island (Colombia), With The Description Of A New Species

Zootaxa, 2016
During a review of material from the project “Assessment of the current status of the faunistic conservation objects from the Gorgona Island: a holistic approach to the ecological evaluation of the Gorgona Natural National Park”, conducted 2010‒2011, a male specimen of Pazius Navás, 1913 (Mecoptera: Bittacidae) was found.
Ascuntar-Osnas, Oscar, Domínguez, Diana Torres, Ulloa, Patricia Chacón De, Machado, Renato Jose Pires   +3 more
openaire   +3 more sources

Pyroclastic rocks: another manifestation of ultramafic volcanism on Gorgona Island, Colombia

Contributions to Mineralogy and Petrology, 1986
Tertiary ultramafic volcanism on Gorgona Island, Colombia, is manifested not only by komatiite flows, but also by a more voluminous sequence of tuff breccias, which is cut by comagmatic picrite dikes. The ultramafic pyroclastic rocks are chaotic to stratified mixtures of angular to subrounded glassy picritic blocks and a fine grained volcaniclastic ...
Echeverría, Lina M., Aitken, Bruce G.
openaire   +1 more source

Contribution to the knowledge of the vegetation of the Gorgona Island (Tuscan Archipelago).

2009
Vegetation survey - first ...
VICIANI, DANIELE, Albanesi D., FOGGI, BRUNO   +2 more
openaire   +1 more source

186Os–187Os systematics of Gorgona Island komatiites: implications for early growth of the inner core

Earth and Planetary Science Letters, 2003
The presence of coupled enrichments in 186 Os/ 188 Os and 187 Os/ 188 Os in some mantle-derived materials reflects longterm elevation of Pt/Os and Re/Os relative to the primitive upper mantle. New Os data for the 89 Ma Gorgona Island, Colombia komatiites indicate that these lavas are also variably enriched in 186 Os and 187 Os, with 186 Os/ 188 Os ...
Brandon, A.D., Walker, R.J., Puchtel, I.S., Becker, H., Humayun, M., Revillon, S.   +5 more
openaire   +2 more sources

Messinian Lago-Mare mollusc fauna from the Gorgona Island slope, Tyrrhenian Sea

Geobios, 2007
Late Miocene Lago-Mare macrofossiliferous sediments were recovered in the northeastern Tyrrhenian Sea by dredging the continental slope off Gorgona Island, Tuscan Archipelago, at 300–470 m depth. The fossil assemblage consists of a rich lymnocardiid bivalve fauna dominated by Pontalmyra ex gr. P. incerta (Deshayes), associated with Dreissena ex gr.
Taviani M, Remia A, Esu D, Sami M
openaire   +3 more sources