Modern sands of the Gulf of Mexico: Discriminating fluvial and coastal sand composition

 A forward stepwise linear discriminant analysis, A-Nova test and R-mode factor analysis were used on modern beach, dune and river sands to discriminate the geographic distribution of detrital modes between sands sourced by volcanic rocks (Trans-Mexican Volcanic Belt (TMVB) sands) and sedim...

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Autores principales:	Kasper-Zubillaga, JJ, Carranza-Edwards, A
Formato:	info:eu-repo/semantics/article
Lenguaje:	eng
Publicado:	Iniversidad Autónoma de Baja California 2003
Materias:	modern and detrital modes linear discriminant analysis A-Nova test factor analysis SW Gulf of Mexico arenas actuales y procedencia análisis de discriminación linea prueba A-Nova análisis factorial Golfo de México sur occidental
Acceso en línea:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/195
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id	repositorioinstitucional-20.500.12930-7366
record_format	dspace
institution	Repositorio Institucional
collection	DSpace
language	eng
topic	modern and detrital modes linear discriminant analysis A-Nova test factor analysis SW Gulf of Mexico arenas actuales y procedencia análisis de discriminación linea prueba A-Nova análisis factorial Golfo de México sur occidental
spellingShingle	modern and detrital modes linear discriminant analysis A-Nova test factor analysis SW Gulf of Mexico arenas actuales y procedencia análisis de discriminación linea prueba A-Nova análisis factorial Golfo de México sur occidental Kasper-Zubillaga, JJ Carranza-Edwards, A Modern sands of the Gulf of Mexico: Discriminating fluvial and coastal sand composition
description	A forward stepwise linear discriminant analysis, A-Nova test and R-mode factor analysis were used on modern beach, dune and river sands to discriminate the geographic distribution of detrital modes between sands sourced by volcanic rocks (Trans-Mexican Volcanic Belt (TMVB) sands) and sedimentary rocks (Veracruz Embayment (VE) sands). Thirty-three beach, dune and river sand samples were collected across beach-dune profiles, in the inner reaches of the channel and at the river mouth during the dry season. The source terranes for these sands are constituted by Miocene to Pliocene volcanites and by Tertiary to Quaternary siliciclastic rocks. To avoid the constrained character of compositional data, point-count percentages were expressed as compositional modal Log ratios (i.e., Log Qt/Ft = total quartz/total feldspars, Log Qt/Lt = total quartz/total lithics, Log Ft/Lt = total feldspars/total lithics, Log Qm/Fk = monocrystalline quartz/potash feldspars, Log Qm/Fp = monocrystalline quartz/ plagioclase, Log Fk/Fp = potash feldspars/plagioclase, and Log Lv/Ls = volcanic lithics/sedimentary lithics). The linear discriminant and factor analyses showed that the geographical dispersal of detrital modes between the TMVB sands and VE sands are statistically significant by means of the Log Lv/Ls, Log Qt/Ft, Log Qt/Lt and Log Ft/Lt ratios. The A-Nova test and post-hoc analyses showed that the mean differences of the Log Lv/Ls, Log Qt/Ft and Log Qt/Lt ratios are highly significant for the VE river sands and the TMVB dune sands. The composition of the TMVB dune sands is controlled by a longshore drift of quartz supply. The VE river sands are depleted in Ls due to the mechanical and/or chemical weathering of Ls and the influence of TMVB on the composition of the VE river sands.
format	info:eu-repo/semantics/article
author	Kasper-Zubillaga, JJ Carranza-Edwards, A
author_facet	Kasper-Zubillaga, JJ Carranza-Edwards, A
author_sort	Kasper-Zubillaga, JJ
title	Modern sands of the Gulf of Mexico: Discriminating fluvial and coastal sand composition
title_short	Modern sands of the Gulf of Mexico: Discriminating fluvial and coastal sand composition
title_full	Modern sands of the Gulf of Mexico: Discriminating fluvial and coastal sand composition
title_fullStr	Modern sands of the Gulf of Mexico: Discriminating fluvial and coastal sand composition
title_full_unstemmed	Modern sands of the Gulf of Mexico: Discriminating fluvial and coastal sand composition
title_sort	modern sands of the gulf of mexico: discriminating fluvial and coastal sand composition
publisher	Iniversidad Autónoma de Baja California
publishDate	2003
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/195
_version_	1792610710148087808
spelling	repositorioinstitucional-20.500.12930-73662023-05-09T14:30:59Z Modern sands of the Gulf of Mexico: Discriminating fluvial and coastal sand composition Arenas actuales del Golfo de México: Discriminación entre la composición de arenas fluviales y costeras Kasper-Zubillaga, JJ Carranza-Edwards, A modern and detrital modes linear discriminant analysis A-Nova test factor analysis SW Gulf of Mexico arenas actuales y procedencia análisis de discriminación linea prueba A-Nova análisis factorial Golfo de México sur occidental  A forward stepwise linear discriminant analysis, A-Nova test and R-mode factor analysis were used on modern beach, dune and river sands to discriminate the geographic distribution of detrital modes between sands sourced by volcanic rocks (Trans-Mexican Volcanic Belt (TMVB) sands) and sedimentary rocks (Veracruz Embayment (VE) sands). Thirty-three beach, dune and river sand samples were collected across beach-dune profiles, in the inner reaches of the channel and at the river mouth during the dry season. The source terranes for these sands are constituted by Miocene to Pliocene volcanites and by Tertiary to Quaternary siliciclastic rocks. To avoid the constrained character of compositional data, point-count percentages were expressed as compositional modal Log ratios (i.e., Log Qt/Ft = total quartz/total feldspars, Log Qt/Lt = total quartz/total lithics, Log Ft/Lt = total feldspars/total lithics, Log Qm/Fk = monocrystalline quartz/potash feldspars, Log Qm/Fp = monocrystalline quartz/ plagioclase, Log Fk/Fp = potash feldspars/plagioclase, and Log Lv/Ls = volcanic lithics/sedimentary lithics). The linear discriminant and factor analyses showed that the geographical dispersal of detrital modes between the TMVB sands and VE sands are statistically significant by means of the Log Lv/Ls, Log Qt/Ft, Log Qt/Lt and Log Ft/Lt ratios. The A-Nova test and post-hoc analyses showed that the mean differences of the Log Lv/Ls, Log Qt/Ft and Log Qt/Lt ratios are highly significant for the VE river sands and the TMVB dune sands. The composition of the TMVB dune sands is controlled by a longshore drift of quartz supply. The VE river sands are depleted in Ls due to the mechanical and/or chemical weathering of Ls and the influence of TMVB on the composition of the VE river sands. Se realizó un análisis de discriminación lineal, una prueba A-Nova y un análisis factorial en arenas actuales de playa, duna y río para discriminar la distribución geográfica composicional entre arenas derivadas de fuentes volcánicas (arenas del Cinturón Volcánico Trans-Mexicano, CVTM) y sedimentarias (arenas de la Cuenca Veracruzana, CV). Se recolectaron 33 muestras de arena de playa, duna y río a lo largo de perfiles de playa-duna, en la desembocadura y el lecho distal de los ríos en la época de secas. La roca fuente está constituida por rocas volcánicas del Mioceno y Plioceno y rocas silicoclásticas del Terciario al Cuaternario. Para evitar el carácter "cerrado" de los datos composicionales, los porcentajes obtenidos del conteo de granos se expresaron como índices logarítmicos (Log Ct/Ft = cuarzo total/feldespato total, Log Ct/Lt = cuarzo total/líticos totales, Log Ft/Lt = feldespato total/líticos totales, Log Cm/Fk = cuarzo monocristalino/feldespato de potasio, Log Cm/Fp = cuarzo monocristalino/plagioclasas, Log Fk/Fp = feldespato de potasio/plagioclasas y Log Lv/Ls = líticos volcánicos/líticos sedimentarios). El análisis de discriminación lineal y el análisis factorial mostraron que las diferencias geográficas composicionales de la arena de playa, duna y río del CVTM y de la CV son estadísticamente significativas mediante los indices Log Lv/Ls, Log Ct/Ft, Log Ct/Lt y Log Ft/Lt. Más aún, las pruebas A-Nova y post-hoc mostraron diferencias significativas en las medias de los índices Log Lv/Ls, Log Ct/Ft y Log Ct/Lt para la arena de duna del CVTM y de la arena de río de la CV. La composición de la arena de duna del CVTM está influída por transporte de cuarzo a lo largo de la costa. La ausencia de Ls en la composición de la arena de río de la CV está determinada por el intemperismo mecanico y/o químico de los Ls y la influencia del CVTM en la composición de la arena de río de la CV. 2003-03-06 2021-06-03T03:55:04Z 2021-06-03T03:55:04Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/195 10.7773/cm.v29i42.195 https://hdl.handle.net/20.500.12930/7366 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/195/164 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 29 No. 4B (2003); 621-630 Ciencias Marinas; Vol. 29 Núm. 4B (2003); 621-630 2395-9053 0185-3880

Modern sands of the Gulf of Mexico: Discriminating fluvial and coastal sand composition

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