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Aproximadamente 20 registro(s) hasta el momento: (journal)

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Recurso libre

Rare-earth element distribution in water from El Chichón Volcano Crater Lake, Chiapas Mexico
Morton-Bermea,O. - Aurora Armienta,M. - Ramos,S.

Formato:	journal article
Enlaces:	This research can be regarded as a pilot study at El Chichón Volcano to assess whether REE distributions can be used as routinely geochemical tracers in the Crater Lake geothermal system. Eighteen lake water samples were collected during 3 field…
Fecha:	2010-03-01
Recurso:	SCIELO

Recurso libre

Carbon and oxygen isotope geochemistry of Neoproterozoic limestones of the Shahabad Formation, Bhima basin, Karnataka, southern India
Nagarajan,Ramasamy - Sial,Alcides N. - Armstrong-Altrin,John S. - Madhavaraju,Jayagopal - Nagendra,Raghavendra

Formato:	journal article
Enlaces:	Petrography, major (including four trace elements), stable isotopes (carbon and oxygen), and 87Sr/86Sr geochemistry of limestones of the Shahabad Formation, Bhima basin, Karnataka, southern India are reported. These limestones show a narrow range of δ13C (1.34-1.96)…
Fecha:	2008-08-01
Recurso:	SCIELO

Recurso libre

Geochemistry of Carboniferous low metamorphic grade sedimentary and tholeiitic igneous rocks in the western Acatlán complex, southern Mexico: deposition along the active western margin of Pangea
Ortega-Obregón,Carlos - Duncan Keppie,J. - Brendan Murphy,J.

Formato:	journal article
Enlaces:	Low grade metasedimentary rocks in the western Acatlán complex (Olinalá area) of southern Mexico occur in two units termed here the Progreso and Zumpango units of Lower and middle Carboniferous ages, respectively. The Zumpango Unit is dominated by phyllite and…
Fecha:	2010-08-01
Recurso:	SCIELO

Recurso libre

Provenance and tectonic setting of Upper Devonian sandstones from Ilanqareh Formation (NW Iran)
Najafzadeh,Adel - Jafarzadeh,Mahdi - Moussavi-Harami,Reza

Formato:	journal article
Enlaces:	Provenance and tectonic setting ofthe Upper Devonian sandstones in NW Iran have been interpreted on the basis of petrography and trace-element analysis of samples from two different stratigraphic sections. Modal analysis data of 27 samples with medium sand size and…
Fecha:	2010-12-01
Recurso:	SCIELO

Recurso libre

Geology and emplacement history of the Nuevo Rosarito plutonic suite in the southern Peninsular Ranges batholith, Baja California, México
Peña-Alonso,Tomás Alejandro - Delgado-Argote,Luis Alberto - Weber,Bodo - Velasco-Tapia,Fernando - Valencia,Víctor

Formato:	journal article
Enlaces:	The Cretaceous Nuevo Rosarito plutonic suite is located in the southern part of the Peninsular Ranges batholith (~28.7 °N). It is hosted by a suite of Jurassicgranitoidrocks datedat 151.6Ma (U-Pb single zircon ages) and by Late Jurassic - Early Cretaceous…
Fecha:	2012-04-01
Recurso:	SCIELO

Recurso libre

Evaporite mineralogy and major element geochemistry as tools for palaeoclimatic investigations in arid regions: A synthesis
Smykatz-Kloss,Werner - Roy,Priyadarsi D

Formato:	journal article
Enlaces:	This paper presents a synthesis of the applications of evaporite mineralogy and the relationship between major elements for the palaeoclimatological research of arid regions, with examples from Playa Oum el Krialate in Tunisia, Wadi Natron in Egypt, East African Rift…
Fecha:	2010-12-01
Recurso:	SCIELO

Recurso libre

Geochemistry of Neoproterozoic shales of the Rabanpalli Formation, Bhima Basin, Northern Karnataka, southern India: implications for provenance and paleoredox conditions
Nagarajan,Ramasamy - Madhavaraju,Jayagopal - Nagendra,Raghavendra - Armstrong-Altrin,John Selvamony - Moutte,Jacques

Formato:	journal article
Enlaces:	The Rabanpalli Formation exhibits two types of shales, viz. grey and calcareous shales. These shales (grey and calcareous) have been analysed for major, trace, and rare earth elements to find out their source rocks characteristics and paleo-oxygenation conditions. The grey…
Fecha:	2007-08-01
Recurso:	SCIELO

Recurso libre

Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting
Jafarzadeh,Mahdi - Hosseini-Barzi,Mahboobeh

Formato:	journal article
Enlaces:	An integrated petrographic and geochemical study of the Ahwaz Sandstone Member ofOligocene-Miocene age, Asmari Formation in Zagros, southwest Iran, was carried out to infer their provenance and tectonic setting. This study is based on the analysis of core samples from…
Fecha:	2008-08-01
Recurso:	SCIELO

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Carboniferous tholeiitic dikes in the Salada unit, Acatlán Complex, southern Mexico: a record of extension on the western margin of Pangea
Morales-Gámez,Miguel - Keppie,J. Duncan - Dostal,Jaroslav

Formato:	journal article
Enlaces:	A suite of mafic dikes intrudes polydeformed, greenschist facies, metapsammites and metapelites of the Salada unit in the eastern part of the Acatlán Complex, southern Mexico. The age of the dikes is constrained by the youngest detrital zircon in the…
Fecha:	2009-04-01
Recurso:	SCIELO

Recurso libre

10.

Provenance of sands from Cazones, Acapulco, and Bahía Kino beaches, Mexico
Armstrong-Altrin,John S.

Formato:	journal article
Enlaces:	Petrographic, major, trace, and rare-earth element geochemistry of sands from three beaches of México (Cazones, Acapulco, and Bahía Kino) were studied to determine their provenance. The textural study reveals that the proportion of quartz is higher in Bahía Kino (~48-83…
Fecha:	2009-12-01
Recurso:	SCIELO

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11.

Geochemistry of late Quaternary tephra-sediment sequence from north-eastern Basin of Mexico (Mexico): implications to tephrochronology, chemical weathering and provenance
Roy,Priyadarsi D. - Arce,José Luis - Lozano,Rufino - Jonathan,M.P. - Centeno,Elena - Lozano,Socorro

Formato:	journal article
Enlaces:	A ca.30 m thick tephra-sediment sequence from the north-eastern Basin of Mexico (Pachuca sub-basin, central Mexico) is investigated for stratigraphy and multi-element geochemistry to understand the tephrochronology, provenance and conditions of chemical weathering duringLate Quaternary. Chemical compositions of tephra layers…
Fecha:	2012-04-01
Recurso:	SCIELO

Recurso libre

12.

Geochemometrics
Verma,Surendra P.

Formato:	journal article
Enlaces:	Analogous to chemometrics, geochemometrics can be defined as the science resulting from the combination of statistics, mathematics and computation with geochemistry. This term in Spanish -geoquimiometría- has already been explicitly used in the literature. Here I elaborate on the numerous…
Fecha:	2012-04-01
Recurso:	SCIELO

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13.

Grain size, mineralogical and geochemical studies of coastal and inland dune sands from El Vizcaíno Desert, Baja California Peninsula, Mexico
Kasper-Zubillaga,Juan José - Zolezzi-Ruiz,Hugo

Formato:	journal article
Enlaces:	A sedimentological, petrological and geochemical research work was carried out in order to find out the origin and provenance of coastal and inland desert dunes from El Vizcaíno Desert, northwestern Mexico. Fifty four sand samples were collected from the windward,…
Fecha:	2007-12-01
Recurso:	SCIELO

Recurso libre

14.

Geochemical and Sr-Nd isotopic characterization of the Miocene volcanic events in the Sierra Madre del Sur, central and southeastern Oaxaca, Mexico
Martínez-Serrano,Raymundo G. - Solís-Pichardo,Gabriela - Flores-Márquez,E. Leticia - Macías-Romo,Consuelo - Delgado-Durán,Jaime

Formato:	journal article
Enlaces:	The Etla, Mitla-Tlacolula and Nejapa volcanic regions in central and southeastern Oaxaca comprise the southeastern part of a wide Cenozoic magmatic arc in the Sierra Madre del Sur. Most volcanic events in these regions ocurred between 22 to 15 Ma,…
Fecha:	2008-01-01
Recurso:	SCIELO

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15.

Transitional adakite-like to calc-alkaline magmas in a continental extensional setting at La Paz Au-Cu skarn deposits, Mesa Central, Mexico: metallogenic implications
Pinto-Linares,Porfirio J. - Levresse,Gilles - Tritlla,Jordi - Valencia,Víctor A. - Torres-Aguilera,José M. - González,Manuel - Estrada,David

Formato:	journal article
Enlaces:	The granodiorite intrusions with associated Cu-Au skarn mineralization of La Paz district are located in the east part of the Mesa Central of Mexico. The skarn developed at the contact between a middle Cretaceous calc-argillaceous sedimentary sequence and the magmatic…
Fecha:	2008-01-01
Recurso:	SCIELO

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16.

Geochemistry of modern sediments from San Quintín coastal lagoon, Baja California: Implication for provenance
Daesslé,Luis Walter - Rendón-Márquez,Gabriel - Camacho-Ibar,Víctor F. - Gutiérrez-Galindo,Efraín A. - Shumilin,Evgueny - Ortiz-Campos,Eduardo

Formato:	journal article
Enlaces:	A detailed regional grid of 97 surficial sediment samples is studied for the San Quintín coastal lagoon, which is a shallow embayment located adjacent to a "regionally-rare" intraplate-type basaltic terrain known as San Quintín volcanic field. The influence that this…
Fecha:	2009-04-01
Recurso:	SCIELO

Recurso libre

17.

Post-Columbian environmental history of Lago Petén Itzá, Guatemala
Pérez,Liseth - Bugja,Rita - Massaferro,Julieta - Steeb,Philip - van Geldern,Robert - Frenzel,Peter - Brenner,Mark - Scharf,Burkhard - Schwalb,Antje

Formato:	journal article
Enlaces:	Two ~40-cm-long sediment cores, PI-SC-1-10m and PI-SC-2-40m, were recovered at 10 and 40 m water depth, respectively, from Lago Petén Itzá, in the Department of Petén, northern Guatemala. The cores span the last ~525 years of sediment accumulation in the…
Fecha:	2010-12-01
Recurso:	SCIELO

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18.

Depositional conditions and source of rare earth elements in carbonate strata of the Aptian-Albian Mural Formation, Pitaycachi section, northeastern Sonora, Mexico
Madhavaraju,Jayagopal - González-León,Carlos M.

Formato:	journal article
Enlaces:	Major, trace and rare earth elements (REE) concentrations in limestone beds of the Canova and El Caloso members of the Mural Formation in the Cerro Caloso Pitaycachi area were measured to understand the depositional conditions and source of REE. Contents…
Fecha:	2012-08-01
Recurso:	SCIELO

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19.

Petrography and geochemistry of the Ab-e-Haji Formation in central Iran: implications for provenance and tectonic setting in the southern part of the Tabas block
Shadan,Mahdi - Hosseini-Barzi,Mahboubeh

Formato:	journal article
Enlaces:	Sandstone petrography and shale geochemistry from the lower Jurassic Ab-e-Haji Formation, in the southern part of Tabas block, were used to constrain provenance, tectonic setting and weathering conditions. The sandstones consist mainly of quartz and sedimentary and low grade metamorphic…
Fecha:	2013-04-01
Recurso:	SCIELO

Recurso libre

20.

Geology, geochronology, and geochemistry of Isla María Madre, Nayarit, Mexico
Pompa-Mera,Valerie - Schaaf,Peter - Hernández-Treviño,Teodoro - Weber,Bodo - Solís-Pichardo,Gabriela - Villanueva-Lascurain,Daniel - Layer,Paul

Formato:	journal article
Enlaces:	Islas Marías archipelago is located 110 km NW of San Blas, Nayarit in the mouth of the Gulf of California. The archipelago is formed by San Juanito, María Madre, María Magdalena, and María Cleofas islands. The position of these islands…
Fecha:	2013-04-01
Recurso:	SCIELO