^(18)O/^(16)O and D/H studies on the interactions between heated meteoric ground waters and igneous intrusions: Western San Juan Mountains, Colorado and the Isle of Skye, Scotland

<p>Detailed oxygen, hydrogen and carbon isotope studies have been carried out on igneous and metamorphic rocks of the Stony Mountain complex, Colorado, and the Isle of Skye, Scotland, in order to better understand the problems of hydrothermal meteoric water-rock interaction.</p> <p>The Tertiary Stony Mountain stock (~1.3 km in diameter), is composed of an outer diorite, a main mass of biotite gabbro, and an inner diorite. The entire complex and most of the surrounding country rocks have experienced various degrees of ¹⁸O depletion (up to 10 per mil) due to interaction with heated meteoric waters. The inner diorite apparently formed from a low-¹⁸O magma with ��¹⁸O ��� +2.5, but most of the isotopic effects are a result of exchange between H₂O and solidified igneous rocks. The low-¹⁸O inner diorite magma was probably produced by massive assimilation and/or melting of hydrothermally altered country rocks. The ��¹⁸O values of the rocks generally increase with increasing grain size, except that quartz typically has ��¹⁸O = +6 to +8, and is more resistant to hydrothermal exchange than any other mineral studied. Based on atom % oxygen, the outer diorites, gabbros, and volcanic rocks exhibit integrated water/rock ratios of 0.3 �� 0.2, 0.15 �� 0.1, and 0.2 �� 0.1, respectively. Locally, water/rock ratios attain values greater than 1.0. Hydrogen isotopic analyses of sericites, chlorites, biotites, and amphiboles range from -117 to -150. ��D in biotites varies inversely with Fe/Fe+Mg, as predicted by Suzuoki and Epstein (1974), and positively with elevation, over a range of 600 m. The calculated ��D of the mid-to-late-Tertiary meteoric waters is about -100. Carbonate ��¹³C values average -5.5 (PDB), within the generally accepted range for deep-seated carbon.</p> <p>Almost all the rocks within 4 km of the central Tertiary intrusive complex of Skye are depleted in ¹⁸O. Whole-rock ��¹⁸O values of basalts (-7. 1 to +8.4), Mesozoic shales (-0.6 to + 12.4), and Precambrian sandstones (-6.2 to + 10.8) systematically decrease inward towards the center of the complex. The Cuillin gabbro may have formed from a ¹⁸O-depleted magma (depleted by about 2 per mil); ��¹⁸O of plagioclase (-7.1 to + 2.5) and pyroxene (-0.5 to + 3.2) decrease outward toward the margins of the pluton. The Red Hills epigranite plutons have ��¹⁸O quartz (-2.7 to + 7.6) and feldspar (-6.7 to + 6.0) that suggest about 3/4 of the exchange took place at subsolidus temperatures; profound disequilibrium quartz-feldspar fractionations (up to 12) are characteristic. The early epigranites were intruded as low-¹⁸O melts (depletions of up to 3 per mil) with ��¹⁸O of the primary, igneous quartz decreasing progressively with time. The Southern Porphyritic Epigranite was apparently intruded as a low-¹⁸O magma with ��¹⁸O ��� -2.6. A good correlation exists between grain size and ��¹⁸O for the unique, high-¹⁸O Beinn an Dubhaich granite which intrudes limestone having a ��¹⁸O range of +0.5 to +20.8, and ��¹³C of -4.9 to -1.0. The ��D values of sericites (-104 to -107), and amphiboles, chlorites, and biotites (-105 to -128) from the igneous rocks , indicate that Eocene surface waters at Skye had ��D ��� -90. The average water/rock ratio for the Skye hydrothermal system is approximately one; at least 2000 km³ of heated meteoric waters were cycled through these rocks.</p> <p>Thus these detailed isotopic studies of two widely separated areas indicate that (1) ¹⁸O-depleted magmas are commonly produced in volcanic terranes invaded by epizonal intrusions; (2) most of the ¹⁸O-depletion in such areas are a result of subsolidus exchange (particularly of feldspars); however correlation of ��¹⁸O with grain size is generally preserved only for systems that have undergone relatively minor meteoric hydrothermal exchange; (3) feldspar and calcite are the minerals mos t susceptible to oxygen isotopic exchange, whereas quartz is very resistant to oxygen isotope exchange; biotite, magnetite, and pyroxene have intermediate susceptibilities; and (4) basaltic country rocks are much more permeable to the hydrothermal convective system than shale, sandstone, or the crystalline basement complex.</p>

Citocinas proinflamatorias: participaci��n en la modulaci��n de la actividad del melanoma experimental B16

252 p. : il.

El pintor navarro Juan Ochoa de Ar��n (1600-1652) y su producci��n en Gipuzkoa

Investigacio��n realizada dentro del Programa de Formacio��n y Perfeccionamiento de Personal Investigador del Gobierno Vasco (2010-2013).

Juan Antonio de Zamacola: vida, obra y concepci��n esteticomusical

Tesis doctoral originalmente defendida en la Universidad de Deusto el 29-09-2000

Carta enviada por Juan Bueso Roda a Justo Garate en 1939

1 carta (manuscrita) ; 225x330 mm

Las industrias prehist��ricas del yacimiento de San Juan (Castro Urdiales, Cantabria) y su contextualizaci��n cronol��gica y cultural

[ES] El an��lisis directo de los ajuares l��tico y ��seo que se conservan del yacimiento de San juan, nos induce a plantear una hip��tesis principal, seg��n la cual la ocupaci��n prehist��rica del dep��sito debi�� producirse fundamentalmente durante el Aziliense, aunque no puede descartarse un origen anterior, en las ��ltimas fases del Magdaleniense.

Icti��logos de la Argentina: Juan Carlos Chebez

This series will include all those people who, by means of their contributions, great and small, played a part in the consolidation of ichthyology in Argentina. The general plan of this work consists of individual factsheets containing a list of works by each author, along with reference bibliography and, whenever possible, personal pictures and additional material. The datasheets will be published primarily in chronological order, although this is subject to change by the availability of materials for successive editions. This work represents another approach for the recovery and revalorization of those who set the foundations of Argentine ichthyology while in diverse historical circumstances. I expect this to be the beginning of a major work that achieves the description of such a significant part of the history of natural sciences in Argentina.

Copia del documento de la Jefatura del Sector de Ochandiano del Ej��rcito Vasco, firmado por Juan Ibarrola, dando cuenta de la distribuci��n de un batall��n

Fecha: 31 de marzo de 1937 / Unidad de ��nstalaci��n: Carpeta Rectorado - D-1 / N�� de p��g.: 2 (manuscritas)

Icti��logos de la Argentina: Aurelio Juan Santiago Pozzi

This series will include all those people who, by means of their contributions, great and small, played a part in the consolidation of ichthyology in Argentina. The general plan of this work consists of individual factsheets containing a list of works by each author, along with reference bibliography and, whenever possible, personal pictures and additional material. The datasheets will be published primarily in chronological order, although this is subject to change by the availability of materials for successive editions. This work represents another approach for the recovery and revalorization of those who set the foundations of Argentine ichthyology while in diverse historical circumstances. I expect this to be the beginning of a major work that achieves the description of such a significant part of the history of natural sciences in Argentina.

Lista de los peces de la provincia de San Juan

Esta serie tiene como finalidad dar a conocer las especies presentes en los diferentes estados provinciales. Tomando como base los trabajos de L��pez et al., (2003); Reis et al., (2003); Liotta (2006) y Ferraris (2007) hemos actualizado el elenco ictiofaun��stico en cada territorio provincial, siguiendo la macrosistem��tica de Nelson (2006). No se realizan, con excepci��n del nombre vulgar y localidad tipo, comentarios ni observaciones sobre las especies se��aladas ya que estos se encuentran en la bibliograf��a adjunta. Se incluyen dos tablas que contienen informaci��n sobre especies introducidas y de aquellas de presencia dudosa o que requieren confirmaci��n en el territorio provincial. En este ��ltimo caso se cita el trabajo que las menciona por primera vez. Consideramos que este modesto aporte contribuir�� a precisar el conocimiento ictiofaun��stico regional ya que adem��s de la lista de especies, presentamos el marco biogeogr��fico e h��drico correspondiente. Por otra parte, entendemos que la participaci��n de autores involucrados en la regi��n considerada, le da un verdadero sentido federal a esta contribuci��n, adem��s de reforzar v��nculos entre los protagonistas de nuestra especialidad. En este nuevo n��mero, presentamos la provincia de San Juan que se encuentra enclavada en el centro-oeste de nuestro territorio, limitada por las provincias de La Rioja, Mendoza y San Luis. Se presenta por primera vez una lista exhaustiva de la ictiofauna de la provincia de San Juan basada en la revisi��n bibliogr��fica y de material de referencia de las colecciones Ictiol��gicas de la Universidad Nacional de San Juan y del Museo de La Plata. Se citan 21 especies, de las cuales 15 no hab��an sido mencionadas con anterioridad (Arratia et al., 1983; Mur��a y Acosta, 1997; Liotta, 2006). Ocho especies han sido introducidas principalmente con fines deportivos. Se menciona la presencia de Percichthys chilensis, lo que constituir��a el primer registro formal de esta especie ya que L��pez-Arbarello (2004) la menciona para el R��o Tunuy��n (Mendoza), sin material de referencia.

Icti��logos de la Argentina: Juan Carlos Vidal

This series will include all those people who, by means of their contributions, great and small, played a part in the consolidation of ichthyology in Argentina. The general plan of this work consists of individual factsheets containing a list of works by each author, along with reference bibliography and, whenever possible, personal pictures and additional material. The datasheets will be published primarily in chronological order, although this is subject to change by the availability of materials for successive editions. This work represents another approach for the recovery and revalorization of those who set the foundations of Argentine ichthyology while in diverse historical circumstances. I expect this to be the beginning of a major work that achieves the description of such a significant part of the history of natural sciences in Argentina.

Semblanzas Ictiol��gicas: Juan Mart��n D��az de Astarloa

A trav��s de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra ���comunidad���. El cuestionario, adem��s de su principal objetivo, con sus respuestas quiz��s nos ayude a encontrar entre nosotros puntos en com��n que vayan m��s all�� de nuestros temas de trabajo y sea un aporte a futuros estudios hist��ricos. Esperamos que esta iniciativa pueda ser otro nexo entre los icti��logos de la regi��n, ya que consideramos que el resultado general trascender��a nuestras fronteras.

An��lise tens��o deforma����o de uma barragem de concreto em solo residual preponderantemente anisotr��pico.

Estudos de funda����es de obras de arte, como barragens de concreto-gravidade e barragens de terra, devem contemplar todos os esfor��os atuantes no maci��o de funda����o, principalmente as tens��es e as deforma����es esperadas durante todo o processo construtivo e no per��odo p��s-construtivo. Quando essas estruturas s��o apoiadas sobre rochas de boa sanidade, a escolha do barramento geralmente favorece a implanta����o de barragens de concreto. Entretanto, quando os maci��os de funda����o s��o formados por solos, a op����o t��cnica geralmente mais bem aceita �� quanto �� utiliza����o de barragens de terra. Em ambos os casos, as an��lises de estabilidade e de deforma����o s��o desenvolvidas por m��todos anal��ticos bem consolidados na pr��tica. Nas condi����es mais adversas de funda����o, seja em rochas ou em solos com marcante anisotropia e estruturas reliquiares herdadas da rocha-m��e, a utiliza����o de modelos constitutivos anisotr��picos em an��lises por elementos finitos propicia simula����es mais realistas dessas fei����es estruturais, contribuindo para o seu melhor conhecimento. O presente trabalho teve por objetivo demonstrar a utiliza����o de um modelo constitutivo anisotr��pico no estudo da funda����o da Barragem San Juan, localizada na Rep��blica Dominicana, que foi concebida como uma estrutura tipo concreto-gravidade apoiada sobre solos residuais jovens altamente anisotr��picos. Nessa obra, apesar de sua pequena altura, a presen��a marcante de descontinuidades ensejou um estudo mais detalhado do comportamento tens��o-deforma����o da funda����o, levando em conta o levantamento detalhado da atitude das descontinuidades presentes no maci��o e os resultados de ensaios de resist��ncia em planos paralelos e normais ��s descontinuidades. Para a estimativa de deforma����es, os respectivos m��dulos de Young (Es) foram estimados com base em correla����es com a resist��ncia �� penetra����o SPT desenvolvidas nesta disserta����o, a partir de um estudo estat��stico baseado em v��rias publica����es dispon��veis na literatura. As an��lises num��ricas por elementos finitos foram desenvolvidas atrav��s do programa Plaxis 2D, utilizando-se como modelo constitutivo aquele denominado The Jointed Rock Model, que �� particularmente recomendado para an��lises de estabilidade e deforma����o de materiais anisotr��picos. Os resultados das an��lises num��ricas foram comparados com as an��lises de equil��brio limite elaboradas para o projeto executivo da referida barragem, pelo programa Slope, utilizando o m��todo rigoroso de Morgenstern e Price, que se mostrou conservador. Os resultados das an��lises num��ricas mostraram sua inequ��voca versatilidade para a escolha de op����es de refor��o da funda����o, atrav��s de dentes que objetivavam o aumento das condi����es de estabilidade da barragem.