Comparison of benthic foraminifera and geochemical proxies in shelf deposits from the Upper Jurassic of the Prebetic (southern Spain)

Reolid, Matías; Martı́nez-Ruiz, Francisca

doi:10.5209/rev_jige.2012.v38.n2.40468

Cited by 14 publications

(15 citation statements)

References 82 publications

(106 reference statements)

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“…The most extensively used geochemical proxy for palaeoproductivity reconstructions is Ba enrichment in marine sediments (e.g., Dehairs et al 1987, Bishop 1988, Dymond et al 1992, Van Os et al 1994, Francois et al 1995, Paytan et al 1996, Martínez-Ruiz et al 2000, Turgeon & Brumsack 2006, Gallego-Torres et al 2007, Reolid & Martínez-Ruiz 2012, but the Ba excess as a palaeoproductivity proxy must be applied with caution because the Ba concentrations can be significantly modified by secondary processes. Others geochemical proxies commonly used to interpret relative fluctuations in productivity are P/Ti ratio (Latimer & Filippelli 2001, Robertson & Filippelli 2008, Reolid & Martínez-Ruiz 2012, Reolid et al 2012a and Sr/Al ratio (Niebuhr 2005, Sun et al 2008, Reolid et al 2012a. The P/Ti ratio reflects excessive phosphorous delivery to the sea-bottom not supported by terrigenous components.…”

Section: Methodsmentioning

confidence: 99%

Environmental conditions during the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost Tethys: influence of the regional context on a global phenomenon

Rodríguez‐Tovar¹,

Reolid²

2013

Bull. Geosci.

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A geochemical analysis has been conducted in the Fuente de la Vidriera section of the External Subbetic (Betic Cordillera, southern Spain) in order to interpret the incidence of the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost end of the Tethys. The obtained values of detrital, redox and palaeoproductivity proxies throughout the succession show minor fluctuations, but only punctual significant changes. Detrital input is nearly constant during the studied interval, except punctually in the lower part of serpentinum Zone, characterized by an increase in both fluvial and eolian detrital transport. Associated to this local higher fluvial and eolian activity, a comparatively higher concentration of organic matter is punctually registered, as revealed by the comparatively highest total organic carbon (TOC) value (0.99 wt.%). The remaining part of the section shows TOC values in the lower range of those registered in the Tethyan Toarcian sections (< 0.4 wt.%). The obtained ratios of redox-sensitive trace metals lead to the interpretation of oxic to dysoxic bottom-waters, with a singular sharp decrease in oxygenation corresponding to a short interval within the serpentinum Zone (sample FV-18) correlated to the T-OAE. The minor incidence of the T-OAE registered in this westernmost end of the Tethys, in which punctual dysoxic conditions are restricted only to a decimetre-scale interval reveals the importance of regional context and local oceanic-atmosphere dynamics on the local record of this phenomenon.•

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Section: Methodsmentioning

confidence: 99%

Environmental conditions during the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost Tethys: influence of the regional context on a global phenomenon

Rodríguez‐Tovar¹,

Reolid²

2013

Bull. Geosci.

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“…In addition, geochemical proxies are applied to interpret palaeoproductivity, the most extensively used being Ba/Al, Sr/ Al and P/Ti ratios (e.g., Turgeon & Brumsack 2006;Gallego-Torres et al 2007;Robertson & Filippelli 2008;Sun et al 2008;Reolid & Martínez-Ruiz 2012;. Uranium and organic matter in the sediment are related in some sedimentary contexts as uranium may form a complex with dissolved fulvic acid in hemipelagic sediments (Nagao & Nakashima 1992).…”

Section: Methodsmentioning

confidence: 99%

Palaeoenvironment of Eocene prodelta in Spitsbergen recorded by the trace fossilPhycosiphon incertum

2014

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“…Endothyra-bear ing lime stones rep re sent the re cov ery in terval of a ma rine en vi ron ment. In crease in foraminiferal ben thic pro duc tiv ity re sulted from food avail abil ity and bot tom-wa ter ox ygen a tion (Tyszka, 1994;Jorrisen et al, 1995;Reolid and Martínez-Ruiz, 2012). The shell mor phol ogy of Endothyra with streptospiral coil ing may re flect of shal low infaunal hab i tats (Olóriz et al, 2003), and a feed ing strat egy of detritivores and bac te rial scav en gers (Reolid et al, 2008).…”

Section: Fig 7 Lithostratigraphic Scheme Of the Dudziniec For Ma Timentioning

confidence: 99%

“…38-39) with foraminifers of the discoidal-flat tened and plano-con vex morphogroups (Spirillina, Trocholina). These foraminifers be long to a graz ing her bi vore and detritivore ben thic epifauna (Tyszka, 1994;Reolid et al, 2008), which de pends on food avail abil ity (phytodetritus, bac te rial pop u la tions) and tol erates ox y gen de ple tion (Tyszka, 2001;Reolid and Martínez-Ruiz, 2012).…”

Section: Fig 7 Lithostratigraphic Scheme Of the Dudziniec For Ma Timentioning

confidence: 99%

Latest Triassic climate humidification and kaolinite formation (Western Carpathians, Tatric Unit of the Tatra Mts)

Lintnerová¹,

Michalı́k²,

Uhlík³

et al. 2013

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The Tomanová For ma tion, of Rhaetian age, over ly ing the Norian Carpathian Keuper in the Tatra Mts. is built of cy clic parasequences of mudstones and sand stones. Quartz (15 to 70 wt.%), kaolinite (13 to 46 wt.%) and 2:1 Al dioctahedral phyllosilicates (dioct 2:1: mus co vite, illite, illite/smectite: 5 to 39 wt.%) rep re sent the ma jor min eral phase. The kaolinite/dioct 2:1 ra tio de creases up wards in the sec tion (from 4.3 to 0.5) and sig nals vari abil ity in weath er ing/ero sion in ten sity and changing wa ter sa lin ity. Ma jor and trace el e ments (LILE, HSFS, REE) in di cate a uni form source -fel sic rocks lo cated prob a bly in the Vindelician High lands. The sed i men ta tion rate (83 mm/ky) was con trolled by cli mate. Al ter na tion of dry and hu mid pe riods is refered by sed i men tary tex tures and by ma tu rity of quartz (ae olian vs. flu vial grains), and or ganic mat ter con tent and com po si tion (C org and d 13 C org ). Authigenic sid er ite or bethierine doc u ments wet and re duced con di tions in the up per part of the Tomanová For ma tion. The sedimention rate of the ma rine Dudzinec For ma tion at tained 25 mm/ka and the char ac ter of cy cles pre served in the se quence is sim i lar as that of the Tomanová For ma tion (fin ing up wards parasequences). How ever, the dif fer ent clay min er al ogy, the re cy cled char ac ter of the sil i cates, the dif fer ent d 13 C org and el e vated imput of car bon ate detri tus with spe cific C and O iso to pic pat terns doc u ment a dis con ti nu ity in the sec tion. The transgressive char ac ter of the Dudzinec Fm. was de duced from the strati graphic dis tri bu tion and en vi ron men tal char ac ter is tics of the ben thic foraminifera pres ent. Involutinids and spirillinids dom i nate in the lower part, endothyrinids gov ern the mid dle part, and in the up per part nodosariids and Ammodiscus-type micro fauna oc cur. These age-di ag nos tic microfossils in di cate a late Rhaetian age. Sea level rise in the Tatric Zone trig gered by ther mal ex pan sion of the Cen tral At lan tic Rift was grad ual, be ing af fected by in put of ter res trial clastic sed i ment both by fresh wa ter and by wind. The Tatric Tri as sic se quence in the West ern Carpathians helps un der stand ing of the de vel op ment of sed i men ta tion, palaeoclimate (kaolinite weath er ing), and palaeo ge ogra phy of the north ern most Tethyan Do main.

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Comparison of benthic foraminifera and geochemical proxies in shelf deposits from the Upper Jurassic of the Prebetic (southern Spain)

Cited by 14 publications

References 82 publications

Environmental conditions during the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost Tethys: influence of the regional context on a global phenomenon

Environmental conditions during the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost Tethys: influence of the regional context on a global phenomenon

Palaeoenvironment of Eocene prodelta in Spitsbergen recorded by the trace fossilPhycosiphon incertum

Latest Triassic climate humidification and kaolinite formation (Western Carpathians, Tatric Unit of the Tatra Mts)

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