scholarly journals Carbon and oxygen stable isotope record of upper Kimmeridgian shallow-marine ramp carbonates (Iberian Basin, NE Spain): the imprint of different burial and tectonic histories

2021 ◽  
Vol 19 ◽  
Author(s):  
Cristina Sequero ◽  
Giovanna Della Porta ◽  
Beatriz Bádenas ◽  
Marcos Aurell
Keyword(s):  
Stable Isotope ◽  
Isotopic Composition ◽  
Tectonic Uplift ◽  
Shallow Marine ◽  
Meteoric Diagenesis ◽  
Iberian Basin ◽  
Stable Isotope Signatures ◽  
Marine Carbonates ◽  
Oxygen Stable Isotope ◽  
Ne Spain

Bulk carbon and oxygen stable isotopes of ancient shallow-marine carbonates can record the effects of multiple palaeoenvironmental factors, but also the imprint of several post-depositional processes, which may alter the original marine isotopic composition. In this study, carbon and oxygen stable isotope analyses were performed on bulk carbonate, bivalve calcitic-shell (Trichites) and calcite vein samples from two stratigraphic sections (Tosos and Fuendetodos, present-day distance 15km), representing proximal inner- and distal mid-ramp environments, respectively, of the uppermost Kimmeridgian ramp facies deposited in the northern Iberian Basin (NE Spain). These successions underwent different diagenetic pathways that altered the primary marine isotopic composition in each section in different ways. Different burial histories, tectonic uplift and a variable exposure to meteoric diagenesis from the end of the Kimmeridgian to the Cenozoic (following Alpine tectonic uplift) are reflected in the different alteration patterns of the carbon and oxygen stable isotope signatures. A significant deviation to lower values in both δ13O and δ18O is recorded in those carbonates mostly exposed to meteoric diagenesis (distal mid-ramp Fuendetodos section), because of post-depositional tectonic uplift (telogenesis). On the other hand, the deposits mainly affected by burial diagenesis (proximal inner-ramp Tosos section) only record low δ18O with respect to expected values for pristine Kimmeridgian marine carbonates. The different burial and tectonic uplift histories of these deposits in each sector, due to their different tectonic evolution in this part of the basin, resulted in a variable degree of diagenetic resetting. However, in spite of the different diagenetic resetting reported of the carbon and oxygen stable isotope signatures in each section, these carbonates show similar cement types in termsof fabrics and cathodoluminescence properties. The diagenetic resetting reported for these carbonates prevents the use of the δ13O and δ18O records for addressing palaeoenvironmental interpretations, but instead highlights useful features regarding the variable diagenetic overprint of the studied shallow-marine carbonate successions concerning their specific post-depositional history.

scholarly journals Latitudinal trends in stable isotope signatures and carbon concentrating mechanisms of northeast Atlantic rhodoliths

2017 ◽  
Author(s):  
Laurie C. Hofmann ◽  
Svenja Heesch
Keyword(s):  
Stable Isotope ◽  
Red Algae ◽  
Free Living ◽  
Shallow Marine ◽  
Northeast Atlantic ◽  
Stable Isotope Signatures ◽  
Carbon Concentrating Mechanisms

Abstract. Rhodoliths are free-living calcifying red algae that form extensive beds in shallow marine benthic environments (

scholarly journals Evidence of photosymbiosis in Palaeozoic tabulate corals

2014 ◽  
Vol 281 (1775) ◽  
pp. 20132663 ◽  
Author(s):  
Mikołaj K. Zapalski
Keyword(s):  
Calcium Carbonate ◽  
Stable Isotope ◽  
Cellular Mechanisms ◽  
The Earth ◽  
Stable Isotope Signatures ◽  
Oxygen Stable Isotope ◽  
Main Components ◽  
Modern Reef ◽  
Reef Formation ◽  
Tabulate Corals

Coral reefs form the most diverse of all marine ecosystems on the Earth. Corals are among their main components and owe their bioconstructing abilities to a symbiosis with algae ( Symbiodinium ). The coral–algae symbiosis had been traced back to the Triassic ( ca 240 Ma). Modern reef-building corals (Scleractinia) appeared after the Permian–Triassic crisis; in the Palaeozoic, some of the main reef constructors were extinct tabulate corals. The calcium carbonate secreted by extant photosymbiotic corals bears characteristic isotope (C and O) signatures. The analysis of tabulate corals belonging to four orders (Favositida, Heliolitida, Syringoporida and Auloporida) from Silurian to Permian strata of Europe and Africa shows these characteristic carbon and oxygen stable isotope signatures. The δ 18 O to δ 13 C ratios in recent photosymbiotic scleractinians are very similar to those of Palaeozoic tabulates, thus providing strong evidence of such symbioses as early as the Middle Silurian ( ca 430 Ma). Corals in Palaeozoic reefs used the same cellular mechanisms for carbonate secretion as recent reefs, and thus contributed to reef formation.

Stable isotope signatures of whisker and blood serum confirm foraging strategies for female New Zealand sea lions (Phocarctos hookeri) derived from telemetry

2017 ◽  
Vol 95 (12) ◽  
pp. 955-963 ◽  
Author(s):  
B.L. Chilvers
Keyword(s):  
New Zealand ◽  
Stable Isotope ◽  
Isotopic Composition ◽  
Blood Serum ◽  
Foraging Strategy ◽  
Foraging Strategies ◽  
Female Population ◽  
Sea Lions ◽  
Stable Isotope Signatures ◽  
Phocarctos Hookeri

Recognizing the individual variability of foraging behaviour of marine predators is important for understanding their role in the marine ecosystem and identifying how species may respond to environmental variability or human impacts. This research examines stable isotope signatures (δ13C and δ15N) of blood serum and whiskers from 22 female New Zealand sea lions (Phocarctos hookeri (Gray, 1844)) to determine if the isotopic composition of serum reflects foraging strategy, and whether serum and proximal whisker growth have similar signatures, therefore indicating the isotopic composition of whiskers also reflects the foraging strategy diet at the time of their growth. Female New Zealand sea lions are known to have two distinct foraging strategies (mesopelagic or benthic ecotypes), shown to be habitual within and between years. Females who are known to be mesopelagic foragers have higher overlap and are at greater risk of harmful interactions with fisheries. This research found that the two foraging strategies identified from telemetry are also associated with different δ13C and δ15N isotopic values from blood serum and whiskers. Therefore, stable isotope analysis could be used to determine the proportion of the female population that are likely to be exposed to the detrimental direct and indirect interactions with fisheries.

scholarly journals Neogene Caribbean elasmobranchs: diversity, paleoecology and paleoenvironmental significance of the Cocinetas Basin assemblage (Guajira Peninsula, Colombia)

2019 ◽  
Vol 16 (1) ◽  
pp. 33-56 ◽  
Author(s):  
Jorge Domingo Carrillo-Briceño ◽  
Zoneibe Luz ◽  
Austin Hendy ◽  
László Kocsis ◽  
Orangel Aguilera ◽  
...  
Keyword(s):  
Stable Isotope ◽  
South America ◽  
Isotopic Composition ◽  
Late Oligocene ◽  
Shallow Marine ◽  
Late Pliocene ◽  
Shark Teeth ◽  
Southern Caribbean ◽  
Northwestern Margin ◽  
First Time

Abstract. The Cocinetas Basin is located on the eastern flank of the Guajira Peninsula, northern Colombia (southern Caribbean). During the late Oligocene through the Pliocene, much of the basin was submerged. The extensive deposits in this area suggest a transition from a shallow marine to a fluvio-deltaic system, with a rich record of invertebrate and vertebrate fauna. The elasmobranch assemblages of the early Miocene to the late Pliocene succession in the Cocinetas Basin (Jimol, Castilletes and Ware formations, as well as the Patsúa Valley) are described for the first time. The assemblages include at least 30 taxa of sharks (Squaliformes, Pristiophoriformes, Orectolobiformes, Lamniformes and Carcharhiniformes) and batoids (Rhinopristiformes and Myliobatiformes), of which 24 taxa are reported from the Colombian Neogene for the first time. Paleoecological interpretations are based on the feeding ecology and on estimates of the paleohydrology (relative salinity, temperature) using stable isotope compositions of oxygen in the bioapatite of shark teeth. The isotopic composition of the studied specimens corroborates paleoenvironmental settings for the studied units that were previously estimated based on the sedimentology and biology of the taxa. These Neogene elasmobranch assemblages from the Cocinetas Basin provide new insights into the diversity the sharks and rays inhabiting the coastal and estuarine environments of the northwestern margin of South America, both during the existence of the gateway between the Atlantic and Pacific oceans and following its closure.

scholarly journals Neogene Caribbean elasmobranchs: Diversity, paleoecology and paleoenvironmental significance of the Cocinetas Basin assemblage (Guajira Peninsula, Colombia)

2018 ◽  
Author(s):  
Jorge Domingo Carrillo-Briceño ◽  
Zoneibe Luz ◽  
Austin Hendy ◽  
László Kocsis ◽  
Orangel Aguilera ◽  
...  
Keyword(s):  
Stable Isotope ◽  
South America ◽  
Isotopic Composition ◽  
Feeding Ecology ◽  
Late Oligocene ◽  
Shallow Marine ◽  
Late Pliocene ◽  
Shark Teeth ◽  
Northwestern Margin ◽  
First Time

Abstract. The Cocinetas Basin is located on the eastern flank of La Guajira Peninsula, northern Colombia (South Caribbean). During late Oligocene through Pliocene, much of the basin was submerged. The extensive deposits in this area suggest a transition from a shallow marine to a fluvio–deltaic system, with a rich record of invertebrate and vertebrate fauna. The elasmobranch assemblages of the early Miocene to late Pliocene succession in the Cocinetas Basin (Jimol, Castilletes and Ware Formations, and Patsúa Valley) are described for the first time. The assemblages include at least 30 taxa of sharks (Squaliformes, Pristiophoriformes, Orectolobiformes, Lamniformes and Carcharhiniformes) and batoids (Rhinopristiformes and Myliobatiformes), of which 24 taxa are reported from the Colombian Neogene for the first time. Paleoecological and paleoenvironmental interpretations are based on the feeding ecology, and on estimates of paleosalinity using stable isotope compositions of oxygen in the bioapatite of shark teeth. The isotopic composition of studied specimens corroborates the paleoenvironmental settings for the studied units suggested on the basis of other proxies. These Neogene elasmobranch assemblages from the Cocinetas Basin, provide new insights of the shark and ray diversity inhabiting the coastal and estuarine environments of the northwestern margin of South America, both during the existence of the gateway between the Atlantic and Pacific Oceans, and following its closure

scholarly journals Diet of Leptobotia elongata revealed by stomach content analysis and inferred from stable isotope signatures

2015 ◽  
Vol 98 (8) ◽  
pp. 1965-1978 ◽  
Author(s):  
L. Li ◽  
Q. Wei Wei ◽  
J. Ming Wu ◽  
H. Zhang ◽  
Y. Liu ◽  
...  
Keyword(s):  
Content Analysis ◽  
Stable Isotope ◽  
Stomach Content ◽  
Stomach Content Analysis ◽  
Stable Isotope Signatures
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