Upwelling and productivity along the Peru–Chile Current derived from faunal and isotopic compositions of planktic foraminifera in surface sediments

Mohtadi, Mahyar; Hebbeln, Dierk; Marchant, Margarita

doi:10.1016/j.margeo.2005.01.008

Cited by 45 publications

(29 citation statements)

References 80 publications

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“…Carbon isotope compositions of foraminifera (Globigerina bulloides and Neogloboquadrina pachyderma (dex.)) from year-round upwelling, seasonal upwelling and non-upwelling regions along the Peru-Chile coast (Mohtadi et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

“…In one instance the δ 13 C of diatoms is controlled by their growth rate (Pancost et al, 1997), which in turn may be limited by the micronutrient iron (Bruland et al, 2001). Furthermore, a study of primary plankton from areas of continuous through seasonal to non-upwelling reflects some of this complex scenario between δ 13 C carbonate values and seawater productivity (Mohtadi et al, 2005). They examined foraminifera from three distinct water regimes off Chile and Peru, with the first from an area of continuous upwelling (22°-35°S), followed by those from area of only seasonal upwelling (35°-42°S) and lastly from a non-upwelling area (N 42°S, Fig.…”

Section: Productivity-carbon Isotopesmentioning

confidence: 99%

“…The results for Globigerina bulloides and Neogloboquadrina pachyderma from a sediment/water interface depth of b 673 m were compiled according to the three water regimes along the coasts of Peru and Chile. Off Chile, G. bulloides prefers water depth ranging from the surface down to about 100 m where phytoplankton density is high, whereas N. pachyderma inhabits water depth ranging from 50 down to 200 m (Mohtadi et al, 2005). Primary productivity is higher in the offshore waters south of 39°S due to the higher precipitation at these higher latitudes and consequently high river discharge into the ocean (Thomas, 1999).…”

Section: Productivity-carbon Isotopesmentioning

confidence: 99%

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Bathymetry and productivity of the southern Great Basin seaway, Nevada, USA: An evaluation of isotope and trace element chemistry in mid-Carboniferous and modern brachiopods

Brand

Webster

Azmy

et al. 2007

Palaeogeography, Palaeoclimatology, Palaeoecology

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The stable isotope and trace element chemistry of brachiopods from stratigraphically, paleontologically, and geochemically three coeval intervals about the mid-Carboniferous boundary in the Bird Spring Formation were evaluated for their potential of serving as proxies of bathymetry and productivity of the southern Great Basin seaway, an eastern arm of the Panthalassa Ocean. Oxygen isotopes delineate both spatial and temporal differences in values of brachiopods from the three coeval mid-Carboniferous sections. Based on pristine brachiopod δ 18 O values and supported by paleoecological information, water depth increased from Apex to Kane Springs Wash East to Arrow Canyon. In addition, there is also an increase in values from the latest Mississippian to the earliest Pennsylvanian suggesting a water temperature (cooling), a water depth (increase), and/or change in both of the habitat of the penecontemporaneous brachiopods.Analogous to values and trends observed in modern brachiopods, the Fe/Mn ratio of fossil counterparts may be a potential proxy of seawater productivity related to the micronutrient iron. Overall, the high ratios of Fe/Mn suggest highly productive waters for the southern Great Basin seaway, with somewhat reduced productivity during the earliest Pennsylvanian. In contrast, the carbon isotope values of the coeval material are relatively invariant with respect to productivity; trends similar to observations on modern carbonate allochems. Based on habitat and paleogeography, the Antler Orogenic Highlands west of the foreland basin are considered a potential source for the micronutrient iron enrichment of the carbonate platform shelf-edge environment. It is further postulated that upwelling currents, in part, which weakened from the latest Mississippian through to the earliest Pennsylvanian, may have transported the micronutrient iron onto the shelf/basin environments of the Bird Spring Formation of the southern Great Basin.

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Section: Methodsmentioning

confidence: 99%

Section: Productivity-carbon Isotopesmentioning

confidence: 99%

Section: Productivity-carbon Isotopesmentioning

confidence: 99%

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Bathymetry and productivity of the southern Great Basin seaway, Nevada, USA: An evaluation of isotope and trace element chemistry in mid-Carboniferous and modern brachiopods

Brand

Webster

Azmy

et al. 2007

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Las diferencias latitudinales en la composición cuali y cuantitativa de la tanatocenocis de radiolarios a lo largo de la zona muestreada reflejan un claro mecanismo de distribución, en el cual existe una disminución de la abundancia y diversidad hacia el sur, coincidiendo con el trabajo de Mothadi et al (2005), donde la concentración del opal también disminuye en los sedimentos hacia el sur de la zona de estudio. Al frente de Concepción (36ºS), la abundancia alcanza su máximo, lo que puede estar asociado a los periodos de surgencias estacionales, pues las cantidades de sílice disuelto son muy altas en aquellas regiones del mundo que presentan estos eventos.…”

Section: Discusionunclassified

Radiolarios Polycystina (Protozoa: Nassellaria Y Spumellaria) Sedimentados en La Zona Centro-Sur De Chile (36°- 43° S)

Margarita

Giglio

2008

Gayana (Concepc.)

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RESUMENLos radiolarios son protozoos planctónicos marinos, los cuales, a pesar de ser sólo una célula, son sofisticados y complejos organismos. La Subclase Radiolaria está formada por 2 superórdenes: Trypilea y Polycystina, siendo el último el más estudiado, pues su esqueleto de opal es más resistente a la disolución en agua de mar y por ende, más comúnmente preservados en el registro fósil. Los radiolarios han sido usados como una útil herramienta oceanográfica, bioestratigráfica y paleoambiental, gracias a su esqueleto de sílice y a su gran rango geológico. En nuestro país el conocimiento de este grupo es muy escaso, es por esto que el presente trabajo, tiene como principal objetivo, aportar con la identificación y descripción de especies de radiolarios Polycystinos, no antes registrados para esta zona en particular. El material fue recolectado por la Expedición PUCK R/V Sonne Cruise SO-156 Valparaíso-Chiloé-Talcahuano realizada en mayo de 2001. Se analizaron 20 muestras tomadas entre 125 y 3.485 m de profundidad, distribuidas desde Concepción hasta Chiloé (36º-43ºS). Se identificaron un total de 28 especies pertenecientes a 20 géneros y a 9 familias. La mayor cantidad de individuos fue encontrada en la estación 3 frente a Concepción a 798 m de profundidad, lo que se asocia a los periodos de surgencias estacionales y a procesos de sedimentación de las testas y disolución del opal relativamente cortos. Hacia el sur disminuye notablemente la abundancia de ambos órdenes estudiados. PALABRAS CLAVES: Radiolarios, Polycystina, Nassellaria y Spumellaria, recientes, opal, Pacífico sureste, Chile. ABSTRACTThe radiolarians are planktonic marine protozoans, which although be only one cell, are sophisticated and complex organisms. The Subclass Radiolaria is formed by two superorders: Trypilea and Polycystina, this last is the most studied, because its skeleton from opal is resistent to the sea water disolution and for this reason are preserved in the fosil record. The radiolarians have been used like a useful oceanographic, biostratigraphic and paleoambiental tool for their silica skeleton and large geologic range. In our country the knowledge of this group is poor, for this reason the present work has the objective to contribute with the indentification and description of Polycystins radiolarians not described and recorded before for this particular zone. The material used was obtained to the PUCK R/V Sonne Cruise SO-156 Valparaíso-Chiloé-Talcahuano Expedition realized in may of 2001. The 20 samples were obtained with a multicore between 125 and 3.485 m depth distributed from Concepción to Chiloé (36°-43°S). Were idientified 28 species appertaining to 20 genus and 9 families. The major amount of individuals was found in the station 3 in front of Concepción to 789 m depth, this could be associated at the seasonals upwelling periods and process to sedimentation of the shells and opal disolution relatively short. Southward decrease the abundance of the two orders studied.

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“…m -2 d -1 ), en donde sus máximos coinciden con el aumento de las surgencias costeras, según lo indicado por los isótopos estables de oxígeno de foraminíferos planctónicos, en donde, los deltas tomaron valores cercanos o iguales a 0 indicando que ambas especies habitan la misma capa térmica evidenciando esta situación (Marchant et al 1998). Mohtadi et al (2005) mediante el estudio de isótopos estables de oxígeno de foraminíferos planctónicos, determinan dos áreas en la costa chilena: al norte y al sur de los 39ºS, ambas con alta productividad, la primera (al norte de los 39°S) debido a las surgencias costeras, donde los valores de δ 18 O en G. bulloides y N. incompta fueron similares (0,7 ‰ VPDB y 0,9‰ VPDB en promedio, respectivamente), y la segunda (al sur de los 39°S), a causa del ingreso de nutrientes a través de sistemas fl uviales, donde los valores isotópicos fueron diferentes (1,61‰ VPDB y 1,07 ‰ VPDB en promedio para G. bulloides y N. incompta, respectivamente), en estas especies, mostrando una mayor estratifi cación.…”

Section: Introductionunclassified

Variación temporal de los afloramientos costeros frente a Chile Central (36°S; 74°W), mediante los isótopos estables de oxígeno de foraminíferos planctónicos, durante El Niño 2006

Gajardo¹,

Marchant²,

Hebbeln

2013

Gayana (Concepc.)

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Upwelling and productivity along the Peru–Chile Current derived from faunal and isotopic compositions of planktic foraminifera in surface sediments

Cited by 45 publications

References 80 publications

Bathymetry and productivity of the southern Great Basin seaway, Nevada, USA: An evaluation of isotope and trace element chemistry in mid-Carboniferous and modern brachiopods

Bathymetry and productivity of the southern Great Basin seaway, Nevada, USA: An evaluation of isotope and trace element chemistry in mid-Carboniferous and modern brachiopods

Radiolarios Polycystina (Protozoa: Nassellaria Y Spumellaria) Sedimentados en La Zona Centro-Sur De Chile (36°- 43° S)

Variación temporal de los afloramientos costeros frente a Chile Central (36°S; 74°W), mediante los isótopos estables de oxígeno de foraminíferos planctónicos, durante El Niño 2006

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