Carbon isotope and magnetostratigraphy of the Cretaceous (Barremian-Aptian) Pabellon Formation, Chanarcillo Basin, Chile

Gregory D. Price, Ben Dashwood, Graerne K. Taylor, Robert M. Kalin, Neil Ogle

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

New oxygen and carbon isotopic analyses of fine–fraction samples from the Pabellón Formation (Chañarcillo Basin, Chile), together with magnetostratigraphic data, are presented. The carbon isotope curve shows a distinctive pattern including a negative isotope excursion preceding a positive event. Within the Lower Aptian this chemostratigraphic event is widely used for correlation of marine and continental stratigraphic sections and confirms the global nature of the episode. The carbon isotope profile improves the stratigraphic correlation of the formation and, together with published ammonite data, the lower part of the succession is interpreted as early Aptian in age, whilst the upper part of the succession is of late Aptian age. The oxygen isotope data are consistent with a diagenetic and metamorphic overprint of the sediments. The palaeomagnetic data are consistent with the rocks having suffered a substantial clockwise rotation during a younger tectonic event, consistent with other units in the wider area and these data do not therefore help further constrain the age of deposition.
LanguageEnglish
Pages183-191
Number of pages9
JournalCretaceous Research
Volume29
Issue number2
DOIs
Publication statusPublished - 2008

Fingerprint

magnetostratigraphy
Barremian
Aptian
basin evolution
carbon isotope
Cretaceous
stratigraphic correlation
ammonite
oxygen isotope
isotope
oxygen
tectonics
carbon
rock
sediment

Keywords

  • carbon isotope
  • civil engineering
  • chile

Cite this

Price, Gregory D. ; Dashwood, Ben ; Taylor, Graerne K. ; Kalin, Robert M. ; Ogle, Neil. / Carbon isotope and magnetostratigraphy of the Cretaceous (Barremian-Aptian) Pabellon Formation, Chanarcillo Basin, Chile. In: Cretaceous Research. 2008 ; Vol. 29, No. 2. pp. 183-191.
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Carbon isotope and magnetostratigraphy of the Cretaceous (Barremian-Aptian) Pabellon Formation, Chanarcillo Basin, Chile. / Price, Gregory D.; Dashwood, Ben; Taylor, Graerne K.; Kalin, Robert M.; Ogle, Neil.

In: Cretaceous Research, Vol. 29, No. 2, 2008, p. 183-191.

Research output: Contribution to journalArticle

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T1 - Carbon isotope and magnetostratigraphy of the Cretaceous (Barremian-Aptian) Pabellon Formation, Chanarcillo Basin, Chile

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AU - Dashwood, Ben

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AU - Ogle, Neil

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AB - New oxygen and carbon isotopic analyses of fine–fraction samples from the Pabellón Formation (Chañarcillo Basin, Chile), together with magnetostratigraphic data, are presented. The carbon isotope curve shows a distinctive pattern including a negative isotope excursion preceding a positive event. Within the Lower Aptian this chemostratigraphic event is widely used for correlation of marine and continental stratigraphic sections and confirms the global nature of the episode. The carbon isotope profile improves the stratigraphic correlation of the formation and, together with published ammonite data, the lower part of the succession is interpreted as early Aptian in age, whilst the upper part of the succession is of late Aptian age. The oxygen isotope data are consistent with a diagenetic and metamorphic overprint of the sediments. The palaeomagnetic data are consistent with the rocks having suffered a substantial clockwise rotation during a younger tectonic event, consistent with other units in the wider area and these data do not therefore help further constrain the age of deposition.

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