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Shallow-water hydrothermal venting : [... a thematic session at the 2003 annual meeting of the Geological Society of America ...] (2005)

Prol-Ledesma, R. M. ; Geological Society of America ; Annual meeting of the Geological Society of America 2003.11.02-05

Amsterdam [u.a.] : Elsevier

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Keywords: Konferenzschrift

Type of Medium: Book

Pages: 182 S. , Ill., graph. Darst., Kt.

Series Statement: Chemical geology 224.2005,1/3

Language: English

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GEOMAR CATALOGUE

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Heat flow variations along the Middle America Trench (1989)

Prol-Ledesma, R. M. ; Sugrobov, V. M. ; Flores, E. L. ; [et al.]

Springer

Marine geophysical researches 11 (1989), S. 69-76

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ISSN: 1573-0581

Keywords: oceanic heat flow ; Mexican subduction zone ; hot trench ; Eastern Pacific

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract A detailed heat flow study of some areas in the Middle America Trench is attempted. Forty six measurements were obtained in the region between the Tres Marias Islands and the Tehuantepec Ridge. The stations were concentrated in three detailed survey areas and 4 profiles. The obtained data show a steep decrease in the heat flow values towards the southern portion of the trench. The detailed survey area, located in the northern end of the trench (Area 20–1) has the highest heat flow average (122 mW m-2), however a characteristical pattern was observed: most data within the Rivera Plate have higher than average heat flow due to the young age of this plate and contrast with the low values associated with the continental lithosphere of the North America Plate. Areas 20–3 and 20–4 have lower averages (50 and 27 mW m-2 respectively) and they coincide with portions of the Guadalupe Plate, proposed by Klitgord and Mammerickx (1982) and assumed to be older than the Cocos Plate, though magnetic lineations have not been directly correlated with age in those areas.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00286248

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Paper (German National Licenses)

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The El Muerto "NYF" Granitic Pegmatite, Oaxaca, Mexico, and Its Striking Enrichment In Allanite-(Ce) and Monazite-(Ce) (2012)

Prol-Ledesma, R.-M., Melgarejo, J. C., Martin, R. F.

Mineralogical Association of Canada

In: Canadian Mineralogist

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Publication Date: 2012-10-29

Description: The El Muerto granitic pegmatite, of Grenville (Neoproterozoic) age, part of the Oaxacan Complex in southern Mexico, contains an exceptional development of HFSE-enriched accessory phases. We report here compositional data and textures involving the exotic minerals of this suite, in particular allanite-(Ce), perrierite-(Ce), monazite-(Ce), thorite, fergusonite-(Y), aeschynite-(Y), yttrium-rich betafite, polycrase-(Y), uranopolycrase, niobian rutile and a variant of thorutite. This pegmatite has the earmarks of a NYF suite, but is devoid of F. El Muerto is a member of an anorogenic anorthosite – mangerite – charnockite – granite (AMCG) suite, understood to be emplaced as a result of gravitational collapse of the lower crust following a collision. In common with other suites of anorogenic affiliation, we attribute the unusual enrichment in HFSE to a stage of metasomatic fertilization of a source in the lower to middle crust prior to its melting.

Print ISSN: 0008-4476

Topics: Geosciences

Published by Mineralogical Association of Canada

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