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Journal Article

CRYSTAL CHEMISTRY OF MINERALS OF THE WÖHLERITE GROUP FROM THE LOS ARCHIPELAGO, GUINEA Available to Purchase

Cristian Biagioni, Stefano Merlino, Gian Carlo Parodi, Natale Perchiazzi
Published: 01 June 2012
The Canadian Mineralogist (2012) 50 (3): 593–609.
DOI: https://doi.org/10.3749/canmin.50.3.593
...Cristian Biagioni; Stefano Merlino; Gian Carlo Parodi; Natale Perchiazzi Abstract As part of the SYNTHESYS European project, a suite of samples from the nepheline syenites of the Los Archipelago, Guinea, was studied in order to characterize the crystal chemistry of the minerals belonging...
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View PDF for article title, CRYSTAL CHEMISTRY OF MINERALS OF THE WÖHLERITE GROUP FROM THE <span class="search-highlight">LOS</span> <span class="search-highlight">ARCHIPELAGO</span>, GUINEA
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Journal Article

ROUMAITE, (Ca,Na,□) 3 (Ca,REE,Na) 4 (Nb,Ti)[Si 2 O 7 ] 2 (OH)F 3 , FROM ROUMA ISLAND, LOS ARCHIPELAGO, GUINEA: A NEW MINERAL SPECIES RELATED TO DOVYRENITE Available to Purchase

Cristian Biagioni, Elena Bonaccorsi, Stefano Merlino, Gian Carlo Parodi, Natale Perchiazzi, Vincent Chevrier, Danilo Bersani
Published: 01 February 2010
The Canadian Mineralogist (2010) 48 (1): 17–28.
DOI: https://doi.org/10.3749/canmin.48.1.17
... syenites on Rouma Island, in the Los Archipelago, in Guinea; associated minerals are aegirine, albite, analcime, arfvedsonite, catapleiite, a eudialyte-group member, microcline, sodalite, sphalerite, steacyite and villiaumite. Roumaite is monoclinic, space group Cc , with cell parameters a 7.473(2), b...
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View PDF for article title, ROUMAITE, (Ca,Na,□) 3 (Ca,REE,Na) 4 (Nb,Ti)[Si 2 O 7 ] 2 (OH)F 3 , FROM ROUMA ISLAND, <span class="search-highlight">LOS</span> <span class="search-highlight">ARCHIPELAGO</span>, GUINEA: A NEW MINERAL SPECIES RELATED TO DOVYRENITE
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Journal Article

The Los Archipelago nepheline syenite ring-structure; a magmatic marker of the evolution of the Central and Equatorial Atlantic Available to Purchase

Christian Moreau, Daniel Ohnenstetter, Daniel Demaiffe, Bernard Robineau
Published: 01 April 1996
The Canadian Mineralogist (1996) 34 (2): 281–299.
View PDF for article title, The <span class="search-highlight">Los</span> <span class="search-highlight">Archipelago</span> nepheline syenite ring-structure; a magmatic marker of the evolution of the Central and Equatorial Atlantic
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Chemical relationships (in apfu) in wöhlerite. Empty squares indicate literature data after Sveshnikova &amp; Burova (1973), Mellini &amp; Merlino (1979), Mariano &amp; Roeder (1989), Keller et al. (1995), Chao &amp; Gault (1997), Bellezza (2004), and Chakhmouradian et al. (2008); black triangles indicate the composition of wöhlerite from the Los Archipelago.

Chemical relationships (in apfu ) in wöhlerite. Empty squares indicate lit... Available to Purchase

Published: 01 June 2012
. (2008) ; black triangles indicate the composition of wöhlerite from the Los Archipelago.
Image
Chemical relationships (in apfu) in the låvenite-normandite series. The empty squares indicate literature data after Mellini (1981) and reference therein, after Chao &amp; Gault (1997), and Perchiazzi et al. (2000); empty triangles represent the chemical data of låvenite from Los Archipelago given by Moreau et al. (1996). Finally, black triangles show the chemistry of the studied specimens.

Chemical relationships (in apfu ) in the låvenite-normandite series. The e... Available to Purchase

Published: 01 June 2012
Fig. 2 Chemical relationships (in apfu ) in the låvenite-normandite series. The empty squares indicate literature data after Mellini (1981) and reference therein, after Chao & Gault (1997) , and Perchiazzi et al . (2000) ; empty triangles represent the chemical data of låvenite from Los
Image
Chemical relationships between (Zr4++Na+) versus (Ca2+ +Mn2++Fe2+) in hiortdahlite I. The empty squares indicate literature data after Merlino &amp; Perchiazzi (1985) and reference therein; the empty triangle represents the chemical data of hiortdahlite from Los Archipelago given by Robles et al. (2001). Finally, black triangles show the chemistry of the studied specimens.

Chemical relationships between (Zr 4+ +Na + ) versus (Ca 2+ +Mn 2+ +Fe 2... Available to Purchase

Published: 01 June 2012
Fig. 4 Chemical relationships between (Zr 4+ +Na + ) versus (Ca 2+ +Mn 2+ +Fe 2+ ) in hiortdahlite I. The empty squares indicate literature data after Merlino & Perchiazzi (1985) and reference therein; the empty triangle represents the chemical data of hiortdahlite from Los Archipelago
Image
Room-temperature optical absorption spectrum of red villiaumite from nepheline syenites of the Los Archipelago, Guinea. The optical spectrum has been background corrected for light scattering caused by crystal inhomogeneities. The main band, assigned to surface plasmon resonance for metallic Na, shifts by about 140 nm in halite relative to villiaumite. As a consequence, light is transmitted in the long wavelength side of the main absorption band. The fit uses a Lorentzian function for the surface plasmon resonance (main band) and Gaussian components for the minority color centers. The functions used for the fit are displayed in green. The resulting fit gives the red dots. (Color online.)

Room-temperature optical absorption spectrum of red villiaumite from nephel... Available to Purchase

Published: 01 May 2021
Figure 1. Room-temperature optical absorption spectrum of red villiaumite from nepheline syenites of the Los Archipelago, Guinea. The optical spectrum has been background corrected for light scattering caused by crystal inhomogeneities. The main band, assigned to surface plasmon resonance
Journal Article

Ocean-Ridge System in Northwest America Available to Purchase

Robert C. Bostrom
Journal: AAPG Bulletin
Published: 01 September 1967
AAPG Bulletin (1967) 51 (9): 1816–1832.
DOI: https://doi.org/10.1306/5D25C187-16C1-11D7-8645000102C1865D
.... The East Pacific Rise is the segment of the ocean-ridge system which enters the North American continent through the Gulf of California. The tectonic development of this rise created the Tertiary architecture of the Los Angeles basin and the Great Valley of California. The question here considered concerns...
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Journal Article

Sodium nanoparticles in alkali halide minerals: Why is villiaumite red and halite blue? Available to Purchase

Georges Calas, Laurence Galoisy, Alexis Geisler
Published: 01 May 2021
American Mineralogist (2021) 106 (5): 838–842.
DOI: https://doi.org/10.2138/am-2021-7917
...Figure 1. Room-temperature optical absorption spectrum of red villiaumite from nepheline syenites of the Los Archipelago, Guinea. The optical spectrum has been background corrected for light scattering caused by crystal inhomogeneities. The main band, assigned to surface plasmon resonance...
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Site-population assignments in the crystal structure of hiortdahlite and hi... Open Access

Published: 24 January 2022
Table 7. Site-population assignments in the crystal structure of hiortdahlite and hiortdahlite-related minerals. Langesundsfjord [1] Langodden [2]** Los Archipelago [3] Monte Somma [4] Hiortdahlite Hiortdahlite * * a (Å) 11.0149(9) 10.9517(1) 10.991(7
Image
Figure 1. Map of sample areas. Boxed areas enclose the generalized sedimentary basins described in the text. A, Manabí. B, Borbon. C, Burica/Nicoya Peninsulas. D, Canal Zone. E, Chucunaque. F, Bocas del Toro. G, Limón. Dredge samples were collected in the region of all five basins sampled for fossils in Panama and Costa Rica, as well as two areas off Nicaragua and Honduras where no fossils were sampled. Abbreviations: GP, Gulf of Panama; GC, Gulf of Chiriquí; SB, western San Blas archipelago; BT, Bocas del Toro province from the Laguna Chiriquí to the Golfo de los Moskitos; LCH, Los Cochinos, Honduras; CMN, Cayos Moskitos, Nicaragua

Figure 1. Map of sample areas. Boxed areas enclose the generalized sedimen... Available to Purchase

Published: 01 February 2009
for fossils in Panama and Costa Rica, as well as two areas off Nicaragua and Honduras where no fossils were sampled. Abbreviations: GP, Gulf of Panama; GC, Gulf of Chiriquí; SB, western San Blas archipelago; BT, Bocas del Toro province from the Laguna Chiriquí to the Golfo de los Moskitos; LCH, Los Cochinos
Image
Relative trophic categorizations of each collection site at Galápagos Archipelago, Ecuador (A, B), and Gulf of California, Mexico (C, D). Black bars in A and C represent coral reef turn-on, turn-off zone (CRTTZ; ∼0.3 mg/m3; Hallock, 2001). Abbreviated sites: DN—Darwin, SC—San Cristóbal, IS—Isabela. Other sites* are Baltra, Santa Fé, Floreana, and Española, which have average chlorophyll-a levels within CRTTZ. In Gulf of California: LA—Los Ángeles, PC—Punta Chivato, SJ—San José, CP—Cabo Pulmo.

Relative trophic categorizations of each collection site at Galápagos Archi... Available to Purchase

Published: 01 July 2016
Figure 2. Relative trophic categorizations of each collection site at Galápagos Archipelago, Ecuador (A, B), and Gulf of California, Mexico (C, D). Black bars in A and C represent coral reef turn-on, turn-off zone (CRTTZ; ∼0.3 mg/m 3 ; Hallock, 2001 ). Abbreviated sites: DN—Darwin, SC—San
Journal Article

Age, duration and spatial distribution of ocean shields and rejuvenated volcanism: Fuerteventura and Lanzarote, Eastern Canaries Available to Purchase

F. J. Perez-Torrado, J. C. Carracedo, H. Guillou, A. Rodriguez-Gonzalez, J. L. Fernandez-Turiel
Published: 28 June 2023
Journal of the Geological Society (2023) 180 (4): jgs2022-112.
DOI: https://doi.org/10.1144/jgs2022-112
...F. J. Perez-Torrado; J. C. Carracedo; H. Guillou; A. Rodriguez-Gonzalez; J. L. Fernandez-Turiel Abstract Fuerteventura and Lanzarote form the oldest emerged part of the Eastern Canary Islands archipelago. Geologically, they can be considered a single edifice, constituting a continuous volcanic...
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Journal Article

CLAY MINERALOGY OF THE EUREKA SOUND AND BEAUFORT FORMATIONS, AXEL HEIBERG AND WEST CENTRAL ELLESMERE ISLANDS, EASTERN CANADIAN ARCTIC ARCHIPELAGO Available to Purchase

R. Marc Bustin, Peter Bayliss
Published: 01 December 1979
Bulletin of Canadian Petroleum Geology (1979) 27 (4): 446–452.
DOI: https://doi.org/10.35767/gscpgbull.27.4.446
... AND WEST CENTRAL ELLESMERE ISLANDS, EASTERN CANADIAN ARCTIC ARCHIPELAGO R. MARC BUSTIN' AND PETER BAYLISS 2 ABSTRACT In the Late Cretaceous and Tertiary strata of the Eureka Sound and Beaufort Formations on Axel Heiberg and west central Ellesmere Islands, kaolinite and illite are the dominant clay minerals...
View PDF for article title, CLAY MINERALOGY OF THE EUREKA SOUND AND BEAUFORT FORMATIONS, AXEL HEIBERG AND WEST CENTRAL ELLESMERE ISLANDS, EASTERN CANADIAN ARCTIC <span class="search-highlight">ARCHIPELAGO</span>
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Journal Article

Nomenclature of wöhlerite-group minerals Open Access

Fabrice Dal Bo, Henrik Friis, Stuart J. Mills
Published: 24 January 2022
Mineralogical Magazine (2022) 86 (4): 661–676.
DOI: https://doi.org/10.1180/mgm.2022.10
...Table 7. Site-population assignments in the crystal structure of hiortdahlite and hiortdahlite-related minerals. Langesundsfjord [1] Langodden [2]** Los Archipelago [3] Monte Somma [4] Hiortdahlite Hiortdahlite * * a (Å) 11.0149(9) 10.9517(1) 10.991(7...
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Journal Article

Southern California as a Structural Type Available to Purchase

R. D. Reed
Journal: AAPG Bulletin
Published: 01 May 1937
AAPG Bulletin (1937) 21 (5): 549–559.
DOI: https://doi.org/10.1306/3D932EC2-16B1-11D7-8645000102C1865D
... of the San Rafael uplift; column 6 for the San Joaquin Hills, southeast margin of Los Angeles Basin. FIG. 4.— Some geological features of the Malay Archipelago. See text for explanation. Figure 4 is a map designed to show geological data of several kinds pertaining to the East Indies...
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Journal Article

Foraminiferal Assemblages As Bioindicators In The Western Caribbean: Albuquerque Cay (Colombia) Open Access

German D. Patarroyo, Gustavo A. Torres, Diego F. Gómez
Published: 13 February 2024
Journal of Foraminiferal Research (2024) 54 (1): 36–48.
DOI: https://doi.org/10.61551/gsjfr.54.1.36
...German D. Patarroyo; Gustavo A. Torres; Diego F. Gómez Abstract The San Andrés Archipelago (Colombia) constitutes a biological hotspot for the Western Caribbean. However, expanding human populations and unrestrained exploitation of the natural resources jeopardize the sustainability of key...
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Journal Article

Variable El Niño–Southern Oscillation influence on biofacies dynamics of eastern Pacific shallow-water carbonate systems Available to Purchase

Alexander F. Humphreys, Jochen Halfar, Fernando Rivera, Derek Manzello, Claire E. Reymond, Hildegard Westphal, Bernhard Riegl
Journal: Geology
Published: 01 July 2016
Geology (2016) 44 (7): 571–574.
DOI: https://doi.org/10.1130/G37745.1
...Figure 2. Relative trophic categorizations of each collection site at Galápagos Archipelago, Ecuador (A, B), and Gulf of California, Mexico (C, D). Black bars in A and C represent coral reef turn-on, turn-off zone (CRTTZ; ∼0.3 mg/m 3 ; Hallock, 2001 ). Abbreviated sites: DN—Darwin, SC—San...
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Journal Article

Seismological notes Available to Purchase

Published: 01 March 1917
Bulletin of the Seismological Society of America (1917) 7 (1): 37–40.
DOI: https://doi.org/10.1785/BSSA0070010037
... a minute, but did no damage. Tejon Pass, California, October zz, z9IdAt 6:45 p.m. October 22, 1916, an earthquake was felt throughout southern California from Fresno on the north to the Imperial Valley on the south. The epi- center seems to have been about the Tejon Pass, near the northwest corner of Los...
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The relation of seismic disturbances in the Philippines to the geologic structure Available to Purchase

Miguel Saderra Maso, S. J., Warren D. Smith
Published: 01 December 1913
Bulletin of the Seismological Society of America (1913) 3 (4): 151–186.
DOI: https://doi.org/10.1785/BSSA0030040151
... seismicity in the Archipelago is in the Agusan Valley, Mindanao. There is a close relationship between seismic disturbances and geomorphic lines and the lines connecting the principal epicenters in the Archipelago. Seismic disturbances can be studied, and disasters can, to a large extent, be avoided...
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