Hydrothermal input in recent sediments proximal to the Eastern Lau Spreading Centre, Lau Basin, SW Pacific

Hydrothermal input in recent sediments proximal to the Eastern Lau Spreading Centre, Lau Basin, SW Pacific

The partition geochemistry and recent Mn accumulation rates have been studied in 14 sediment cores collected adjacent to the Eastern Lau Spreading Centre (ELSC) in the Lau Basin, SW Pacific. The sediments are oxic in nature, formed of ash with abundant nannofossil ooze and hydrothermal Mn oxides dis...

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Autores principales: Daesslé, LW, Cronan, DS
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2001
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/496
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id oai:cienciasmarinas.com.mx:article-496
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Daesslé, LW
Cronan, DS
spellingShingle Daesslé, LW
Cronan, DS
Hydrothermal input in recent sediments proximal to the Eastern Lau Spreading Centre, Lau Basin, SW Pacific
author_facet Daesslé, LW
Cronan, DS
author_sort Daesslé, LW
title Hydrothermal input in recent sediments proximal to the Eastern Lau Spreading Centre, Lau Basin, SW Pacific
title_short Hydrothermal input in recent sediments proximal to the Eastern Lau Spreading Centre, Lau Basin, SW Pacific
title_full Hydrothermal input in recent sediments proximal to the Eastern Lau Spreading Centre, Lau Basin, SW Pacific
title_fullStr Hydrothermal input in recent sediments proximal to the Eastern Lau Spreading Centre, Lau Basin, SW Pacific
title_full_unstemmed Hydrothermal input in recent sediments proximal to the Eastern Lau Spreading Centre, Lau Basin, SW Pacific
title_sort hydrothermal input in recent sediments proximal to the eastern lau spreading centre, lau basin, sw pacific
description The partition geochemistry and recent Mn accumulation rates have been studied in 14 sediment cores collected adjacent to the Eastern Lau Spreading Centre (ELSC) in the Lau Basin, SW Pacific. The sediments are oxic in nature, formed of ash with abundant nannofossil ooze and hydrothermal Mn oxides dispersed within the calcareous sediments. These oxides represent distal plume fallout derived mainly from the hydrothermal fields along the ELSC and possibly from the nearby Central Lau Spreading Centre (CLSC). Nickel, Mo, Pb and, to a lesser extent, Co and V are associated with the Mn-oxide phase, possibly scavenged by Mn precipitates. Only low proportions of Fe, Zn and Cu are found in the oxide phase, these elements being mainly associated with the detrital/altered-detrital sediment phases. Some peaks in the Mn distribution downcore appear to correlate among the cores studied, indicating common pulses of hydrothermal plume fallout. The similar Fe/Mn oxide ratios (1.4–1.9) in surficial sediments proximal to the Eastern and Central Lau Spreading Centres, suggest similar plume fallout compositions in these two areas. Mean Mn accumulation rates average 26 mg cm–2 ka–1. The hydrothermal sedimentation near the ELSC is probably related to a fully developed hydrothermal plumbing at the spreading centre and thus the ELSC has a good potential for hosting massive sulphide deposits, although a lower hydrothermal input at its northernmost tip may indicate a drop in magmatic activity and mineral potential in the oldest section of this spreading ridge.
publisher Iniversidad Autónoma de Baja California
publishDate 2001
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/496
_version_ 1715723975315685376
spelling oai:cienciasmarinas.com.mx:article-4962019-05-03T23:21:34Z Hydrothermal input in recent sediments proximal to the Eastern Lau Spreading Centre, Lau Basin, SW Pacific Aporte hidrotermal en sedimentos recientes cercanos al Centro de Dispersión Oriental de la Cuenca Lau, Pacífico Sur Occidental Daesslé, LW Cronan, DS Lau Basin sediment geochemistry hydrothermal manganese accumulation Cuenca Lau sedimento geoquímica hidrotermal acumulación de manganeso The partition geochemistry and recent Mn accumulation rates have been studied in 14 sediment cores collected adjacent to the Eastern Lau Spreading Centre (ELSC) in the Lau Basin, SW Pacific. The sediments are oxic in nature, formed of ash with abundant nannofossil ooze and hydrothermal Mn oxides dispersed within the calcareous sediments. These oxides represent distal plume fallout derived mainly from the hydrothermal fields along the ELSC and possibly from the nearby Central Lau Spreading Centre (CLSC). Nickel, Mo, Pb and, to a lesser extent, Co and V are associated with the Mn-oxide phase, possibly scavenged by Mn precipitates. Only low proportions of Fe, Zn and Cu are found in the oxide phase, these elements being mainly associated with the detrital/altered-detrital sediment phases. Some peaks in the Mn distribution downcore appear to correlate among the cores studied, indicating common pulses of hydrothermal plume fallout. The similar Fe/Mn oxide ratios (1.4–1.9) in surficial sediments proximal to the Eastern and Central Lau Spreading Centres, suggest similar plume fallout compositions in these two areas. Mean Mn accumulation rates average 26 mg cm–2 ka–1. The hydrothermal sedimentation near the ELSC is probably related to a fully developed hydrothermal plumbing at the spreading centre and thus the ELSC has a good potential for hosting massive sulphide deposits, although a lower hydrothermal input at its northernmost tip may indicate a drop in magmatic activity and mineral potential in the oldest section of this spreading ridge. Se estudiaron la geoquímica de partición y las tasas recientes de acumulación de Mn en 14 núcleos recolectados en la zona adyacente al Centro de Dispersión Oriental de la Cuenca Lau (CDOL), en el Pacífico suroccidental. Los sedimentos son de naturaleza óxica, formados por cenizas y abundantes lodos nanofosilíferos, así como de óxidos hidrotermales de Mn dispersos en estos sedimentos calcáreos. Estos óxidos representan partículas precipitadas a partir de fumarolas lejanas, derivadas principalmente de campos hidrotermales a lo largo del CDOL y posiblemente del Centro de Dispersión Central de la Cuenca Lau (CDCL). Níquel, Mo, Pb y, en menor grado, Co y V, se encuentran asociados con la fase de óxidos de Mn, posiblemente secuestrado por precipitados de Mn. Solamente se encontraron pequeñas proporciones de Fe, Zn y Cu en la fase de óxidos, estando asociados principalmente con las fases detrítico/detritico alteradas en los sedimentos. Algunos máximos en la concentración del Mn núcleo abajo, parecen estar correlacionados entre los núcleos estudiados, indicando pulsos comunes de precipitación de partículas de fumarolas hidrotermales. Las relaciones similares de óxidos de Fe/Mn (1.4–1.9) en sedimentos superficiales cercanos al CDCL y al CDOL, sugieren una composición similar de las partículas precipitadas de las fumarolas en estas dos áreas. Las tasas medias de acumulación de Mn promedian 26 mg cm–2 ka–1. La sedimentación hidrotermal cercana al CDOL probablemente se encuentra relacionada con una actividad hidrotermal totalmente desarrollada, localizada sobre el centro de dispersión y, por lo tanto, éste tiene un buen potencial para albergar depósitos importantes de sulfuros, aunque un bajo aporte hidrotermal en su extremo norte puede indicar una disminución de la actividad magmática y del potencial de mineralización en la sección más antigua de la dorsal de dispersión. Iniversidad Autónoma de Baja California 2001-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/496 10.7773/cm.v27i4.496 Ciencias Marinas; Vol. 27 No. 4 (2001); 635-659 Ciencias Marinas; Vol. 27 Núm. 4 (2001); 635-659 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/496/434

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