Carbon isotope stratigraphy and carbonate production during the Early–Middle Jurassic: examples from the Umbria–Marche–Sabina Apennines (central Italy)

Morettini, E.; Santantonio, Massimo; Bartolini, Annachiara; Cecca, Fabrizio; Baumgartner, Peter O.; Hunziker, Johannes C.

doi:10.1016/s0031-0182(02)00258-4

Cited by 117 publications

(70 citation statements)

References 37 publications

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“…They are most likely caused by a longer duration of photic zone euxinia in the depositional environment and do not reflect the overall composition of dissolved inorganic carbon in seawater. Moreover, whatever the palaeogeographical location (boreal or Tethyan), the Late Kimmeridgian is characterized by either an increase or a decrease in carbon-and oxygen-isotope ratios (Morgans-Bell et al 2001;Weissert & Mohr, 1996;Jenkyns et al 2002;Bartolini, Baumgartner & Guex, 1999;Bartolini, Baumgartner & Hunziker, 1996;Cecca et al 2001;Gröcke et al 2003;Morettini et al 2002;Padden et al 2002;Price & Gröcke, 2002;Price & Rogov, 2009;Riboulleau et al 1998;Wierzbowski, 2004). Lastly, the compilation of δ 18 O and δ 13 C values from diagenetically little altered Phanerozoic fossil shells indicates a general decrease in δ 18 O and δ 13 C Colombié & Rameil (2007).…”

Section: A General Carbon-and Oxygen-isotopic Trends In the Kimmermentioning

confidence: 98%

Carbon- and oxygen-isotope records of palaeoenvironmental and carbonate production changes in shallow-marine carbonates (Kimmeridgian, Swiss Jura)

2010

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-Carbon-and oxygen-isotope ratios are commonly used to correlate shallow-and deepmarine successions. Carbon-and oxygen-isotope analyses were performed on bulk-carbonate samples from two Kimmeridgian sections of the Swiss Jura platform in order to correlate them with biostratigraphically well-dated coeval sections in the adjacent basin. On the platform, a general decrease in δ 13 C and δ 18 O values from the base to the top of the studied interval is measured, whereas time-equivalent pelagic-hemipelagic carbonates record an increase in carbon-and oxygen-isotope ratios. Moreover, the measured δ 13 C and δ 18 O values are generally lower than those indicated for the Kimmeridgian open ocean and show high-frequency variations superimposed on the general trend. Samples were screened for diagenetic alteration using optical and cathodoluminescence petrography and coupled carbon-and oxygen-isotope and trace-element analyses. Some observations favour a role for diagenetic alteration, but isotopic and elemental trends as well as sedimentological evidence suggest that the more negative values of δ 13 C and δ 18 O relative to Kimmeridgian seawater are also due to local environmental conditions. High-frequency changes in δ 18 O and δ 13 C values most likely result from variations in salinity and carbonate production and accumulation rates. These variations were produced by different water masses that were isolated from the open ocean and developed their own geochemical signatures. Repeated isolation was induced by high-frequency sea-level fluctuations and helped by irregular platform morphology. Consequently, carbon-and oxygen-isotope records in shallow-marine carbonates can be used for stratigraphic correlation only if their origin is well known.

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Section: A General Carbon-and Oxygen-isotopic Trends In the Kimmermentioning

confidence: 98%

Carbon- and oxygen-isotope records of palaeoenvironmental and carbonate production changes in shallow-marine carbonates (Kimmeridgian, Swiss Jura)

2010

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“…1 b). Correlation with the 8 13 C curves obtained in central Italy from bulk carbonates (Bartolini et al, 1996(Bartolini et al, , 1999Morettini et al, 2002) is uncertain in the Terminilletto section due to the lack of a detailed biostratigraphy. However, correlation with the 8 13 C bulk obtained in the Presale section shows a general good correlation with the curve obtained in this work.…”

Section: 2mentioning

confidence: 98%

Palaeoclimatic and biotic changes during the Aalenian (Middle Jurassic) at the southern Laurasian Seaway (Basque–Cantabrian Basin, northern Spain)

Gómez

Canales

Ureta

et al. 2009

Palaeogeography, Palaeoclimatology, Palaeoecology

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The uppermost Toarcian-lowermost 8ajocian deposits have been studied in 10 sections located in the western part of the Basque-Cantabrian Basin (northern Spain). The studied 276 successive recorded ammonite assemblages allowed detailed biostratigraphical subdivision and the correlation of the sections at the ammonite zone and subzone scale. The foraminifers were studied in 96 samples and 55 diagenetically screened belemnite rostra were analyzed for C and 0 isotope.Facies and thickness distribution of the Aalenian sediments suggest that deposition took place in a nearly symmetrical sub-basin included into an intra plate shallow platform, developed over continental crust, on which flexure was the main control responsible for subsidence and basin evolution.Noteworthy negative 613Cb�1 excursions, coinciding with seawater temperature changes, were recorded during the Bradfordensis Biochron, around the Concavum-Limitatum biochron boundary, and around the Aalenian-Bajocian boundary. A close relationship between the changes in seawater temperature and the biotic changes observed in the foraminiferal and in the ammonoids assemblages has been evidenced. During the Comptum Biochron, the 6180�1-based palaeotemperature shows a remarkable cooling interval with an average seawater temperature of 15.7 QC. This cooling favoured the immigration of species of foraminifers that thrived in platforms with colder seawater temperatures located north of the Basque-Cantabrian Basin.As a consequence, a strong increase in the diversity of the foraminiferal assemblages (28.5% of first appearances) occurred. This interval also coincides with the highest ammonoid abundance recorded during the Aalenian. A notable increase in temperature with peak values up to 24.3 QC, was measured during the Bradfordensis Biochron. This warming marks the beginning of progressive loss of foraminifer diversity and the decrease in the abundance of ammonoids. However, the increase in the relative abundances of some foraminiferal taxa such as the genus Spirillina during the warming phase is remarkable. Some of the foraminiferal species that had their last occurrence during this interval seem to be immigrants from NW Europe that arrived during the Comptum cooling interval, and that did not survive to rise of the seawater temperature.Another drop in temperature was recorded during the late Gigantea and the early Concavum biochrons.Coinciding with this cooling interval nearly 20% of the foraminiferal species disappeared while the ammonoid abundance increased. A new and significant warming episode occurred during the latest Aalenian (Limitatum Biochron), extending to the earliest Bajocian (Discites Biochron). Biotic response to this new bT of 2.5 QC is remarkable, marking one of the most important crises of the Aalenian. More than 30% of the foraminiferal species disappeared and no new appearances were recorded. Ammonoids show a decrease in the specimen abundance during the Limitatum-Discites warming, preceding a drastic decrease in the species abundance.The rem...

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“…By contrast, the inception of condensed pelagic sedimentation on PCPs was the result of a regionally synchronous drowning of the small surviving fault-bounded carbonate banks in the early Pliensbachian, possibly due to climate-related eutrophication of the environment, evidenced by a positive d 13 C shift (Morettini et al, 2002). The Calcare Massiccio B Mbr (Sinemurian p.p.…”

Section: Stratigraphy and Geological Settingmentioning

confidence: 98%

Geology and Jurassic paleogeography of the Mt. Primo-Mt. Castel Santa Maria ridge and neighbouring areas (Northern Apennines, Italy)

Fabbi

2014

Journal of Maps

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This paper presents the results of a geological mapping project across the Mt. Primo ridge and neighbouring areas (Umbria-Marche Domain -Northern Apennines), where a thick MesoCenozoic carbonate succession is exposed. A geological map on the 1:15,000 scale, illustrates the main stratigraphic, paleogeographic and structural features of the area. The geometries of Jurassic stratigraphic units, were mainly controlled by the complex submarine topography resulting from an Early Jurassic extensional phase. The three-dimensional distribution of Jurassic rocks in turn conditioned the structural evolution of this part of the Apennines during the chain building phase.

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Carbon isotope stratigraphy and carbonate production during the Early–Middle Jurassic: examples from the Umbria–Marche–Sabina Apennines (central Italy)

Cited by 117 publications

References 37 publications

Carbon- and oxygen-isotope records of palaeoenvironmental and carbonate production changes in shallow-marine carbonates (Kimmeridgian, Swiss Jura)

Carbon- and oxygen-isotope records of palaeoenvironmental and carbonate production changes in shallow-marine carbonates (Kimmeridgian, Swiss Jura)

Palaeoclimatic and biotic changes during the Aalenian (Middle Jurassic) at the southern Laurasian Seaway (Basque–Cantabrian Basin, northern Spain)

Geology and Jurassic paleogeography of the Mt. Primo-Mt. Castel Santa Maria ridge and neighbouring areas (Northern Apennines, Italy)

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