Minor- and trace-element intra-shell variations in Santonian inoceramids (Basque-Cantabrian Basin, northern Spain): diagenetic and primary causes

Jiménez-Berrocoso, A.; Zuluaga, María Cruz; Elorza, Javier

doi:10.1007/s10347-004-0009-6

Cited by 18 publications

(6 citation statements)

References 50 publications

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“…Contrary to the prediction of very low δ 13 C values if inoceramids depended on chemosynthetic bacteria for nutrition, Demerara Rise shell organics have δ 13 C that closely match the δ 13 C of bulk rock organics (Tables 3 and 4 and Figure 5a). Rather than supporting chemosynthesis, the close correspondence between shell and bulk organics δ 13 C suggests settling organic debris was a primary food source, as proposed for other Late Cretaceous inoceramids [ Gómez‐Alday and Elorza , 2003; Jiménez‐Berrocoso et al , 2004].…”

Section: Discussionmentioning

confidence: 99%

“…Since the d 13 C values of food sources are reflected in bivalve shell proteins [Raikow and Hamilton, 2001;Hobson et al, 2002; O'Donnell et al, (Tables 3 and 4 and Figure 5a). Rather than supporting chemosynthesis, the close correspondence between shell and bulk organics d 13 C suggests settling organic debris was a primary food source, as proposed for other Late Cretaceous inoceramids [Gómez-Alday and Elorza, 2003;Jiménez-Berrocoso et al, 2004].…”

Section: Inoceramid Ecology 521 Heterotrophy and Trophic Levelmentioning

confidence: 99%

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Bottom water anoxia, inoceramid colonization, and benthopelagic coupling during black shale deposition on Demerara Rise (Late Cretaceous western tropical North Atlantic)

et al. 2008

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[1] The bulk rock geochemistry and inoceramid isotopic composition from Cenomanian to Santonian, finely laminated, organic-rich black shales, recovered during Ocean Drilling Program Leg 207 on Demerara Rise (western tropical North Atlantic), suggest persistent anoxic (free H 2 S) conditions within the sediments and shortterm variations within a narrow range of anoxic to episodically dysoxic bottom waters over a $15 Ma time interval. In addition to being organic-rich, the 50-90 m thick sections examined exhibit substantial bulk rock enrichments of Si, P, Ba, Cu, Mo, Ni, and Zn relative to World Average Shale. These observations point to high organic burial fluxes, likely driven by high primary production rates, which led to the establishment of intensely sulfidic pore waters and possibly bottom waters, as well as to the enrichments of Cr, Mo, U, and V in the sediments. At the same time, the irregular presence of benthic inoceramids and foraminifera in this facies demonstrates that the benthic environment could not have been continuously anoxic. The d 13 C and d 15

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Section: Discussionmentioning

confidence: 99%

Section: Inoceramid Ecology 521 Heterotrophy and Trophic Levelmentioning

confidence: 99%

Bottom water anoxia, inoceramid colonization, and benthopelagic coupling during black shale deposition on Demerara Rise (Late Cretaceous western tropical North Atlantic)

et al. 2008

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“…Sr 2+ , Na + ) with respect to the denser lattice of calcite, in which smaller cations are frequently found in higher amounts. In contrast, in the Basque-Cantabrian Basin inoceramids, Gómez-Alday & Elorza (2003) and Jiménez-Berrocoso et al (2004) interpreted that palaeoenvironmental factors (e.g. cyclic temperature and food availability changes) were the main controls on the geochemical intra-shell variations exclusively along the low-Mg calcite prismatic microstructure.…”

Section: Palaeoenvironmental Insights From a Rabotensis Inner Aragonmentioning

confidence: 94%

“…Analytical conditions were a beam current of 30 nA for all of the elements, except Ca 2+ (10 nA), an accelerating voltage of 15 kV and a spot diameter of 5 μm, which can be easily observable in reflected light and under CL. Details of the analytical conditions (detection limits and counting times) are given in Jiménez-Berrocoso et al (2004) and Table I. Analyses of the shell samples totalled 667 spots, shared in four transects corresponding to shells A. rabotensis Re-1T (Line 1 and Line 2) and F-71 (Line 1 and Line 2), typically along the prisms of the inoceramid shells.…”

Section: Methodsmentioning

confidence: 99%

New petrographic and geochemical insights on diagenesis and palaeoenvironmental stress in Late Cretaceous inoceramid shells from the James Ross Basin, Antarctica

2006

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New petrographic and geochemical insights from inoceramid bivalve shells of lower Campanian (Marambio Group, James Ross Basin, Antarctica) show that they suffered significant palaeoenvironmental stress just before their disappearance in the southern high latitudes. Inoceramid data have mainly been derived from shell fragments of the large form Antarcticeramus rabotensis Crame & Luther, collected at stratigraphical levels marking the early disappearance of inoceramids in the James Ross Basin (10 m.y. before the Cretaceous/Tertiary boundary in Antarctica). Cathodoluminescence studies and minor and trace element intra-shell variations in A. rabotensis shells, along with their whole shell geochemistry (major, minor, and trace elements, including REE), have revealed evidence of only weak diagenesis but significant palaeoenvironmental stress. The most relevant evidence of such adverse palaeoenvironmental conditions in A. rabotensis shells is reflected by marked growth interruptions in the normal shell layering, including the occurrence of a previously undetected inner aragonitic nacreous layer formed of alternating aragonitic and calcitic sublayers. The weak diagenesis produced characteristic geochemical intra-shell variations, which have subsequently been detected in the inoceramid shell microstructure, especially in the inner aragonitic nacreous layer.

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“…The umbonal parts have proven to be the best spots for sampling in these two groups. The absence of the inner aragonitic nacreous layer (IANL) in inoceramid shells suggests a diagenetic alteration of the inoceramids which may also affect the inter-prismatic zones of the low-Mg prismatic layer (LMPL; e.g., Jiménez-Berrocoso et al 2004, 2006. However, in some cases the intercalated lines corresponding to the boundaries between inoceramid prisms are non-luminescent (Text- fig.…”

Section: Petrography and Cathodoluminescencementioning

confidence: 99%

High-resolution Campanian–Maastrichtian carbon and oxygen stable isotopes of bulk-rock and skeletal components: palaeoceanographic and palaeoenvironmental implications for the Boreal shelf sea

Wilmsen¹,

Niebuhr²

2017

Acta Geologica Polonica

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ABSTRACT:Wilmsen, M. and Niebuhr, B. 2017. High-resolution Campanian-Maastrichtian carbon and oxygen stable isotopes of bulk-rock and skeletal components: palaeoceanographic and palaeoenvironmental implications for the Boreal shelf sea. Acta Geologica Polonica, 67 (1), 47-74. Warszawa.A high-resolution latest Early Campanian to Early Maastrichtian carbon and oxygen stable isotope record from the northern German Boreal shelf sea based on 537 analyses of co-occurring belemnites, brachiopods, inoceramids, oysters, and bulk rock samples is presented. All samples are precisely related to their stratigraphic, systematic and facies backgrounds and form an integrated, nearly 10-myr-long dataset with considerable palaeoenvironmental and palaeoceanographical implications. Petrographic studies indicate that low-magnesium calcitic coccoliths and calcispheres (i.e., planktic carbonate) predominate the bulk-rock data (marl-limestone rhythmites and chalks), thus representing a sea-surface water signal, and that only minor diagenetic alteration of the carbonate muds took place. Based on TL and CL microscopy, the investigated belemnites are extraordinarily well preserved, which may in part be explained by their early diagenetic surficial silicification (container effect), while the other macroinvertebrate groups are all less well preserved. The (plankton-dominated) d O signal of ambient seawater (12 ± 2°C). In the absence of any indication for migration from cooler water masses and evidence for authochtonous populations we assume that the belemnites of the genera Belemnitella and Belemnella lived as nektobenthos near the sea-floor and thus record the temperature of the bottom mixed layer of the seasonally weakly stratified north German shelf sea at water depths of 100 to 150 m; the temperature gradient was thus 12.5-18.75 m/1°C. A conspicuous latest Campanian cooling event is evident in both sea-surface and bottom-water temperatures. The d 18O values of nearly all investigated benthic fossils lie between the isotope values of pristine belemnites and bulk rock, and, therefore, should be used for palaeotemperature reconstructions only with great care.

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Minor- and trace-element intra-shell variations in Santonian inoceramids (Basque-Cantabrian Basin, northern Spain): diagenetic and primary causes

Cited by 18 publications

References 50 publications

Bottom water anoxia, inoceramid colonization, and benthopelagic coupling during black shale deposition on Demerara Rise (Late Cretaceous western tropical North Atlantic)

Bottom water anoxia, inoceramid colonization, and benthopelagic coupling during black shale deposition on Demerara Rise (Late Cretaceous western tropical North Atlantic)

New petrographic and geochemical insights on diagenesis and palaeoenvironmental stress in Late Cretaceous inoceramid shells from the James Ross Basin, Antarctica

High-resolution Campanian–Maastrichtian carbon and oxygen stable isotopes of bulk-rock and skeletal components: palaeoceanographic and palaeoenvironmental implications for the Boreal shelf sea

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