Cretaceous-Paleogene biomagnetostratigraphy of ODP Leg 121 sites

Pospichal, James J; Dehn, J.; Driscoll, Neal W.; Eijden, Ajm van; Farrell, John W; Fourtanier, Elisabeth; Gamson, Paul; Gee, J. S.; Janecek, Thomas R; Jenkins, D. Graham; Klootwijk, Christian T; Nomura, Ritsuo; Owen, Robert M.; Rea, David K.; Resiwati, Purtyasti; Smit, Jan; Smith, Guy M.

doi:10.1594/pangaea.759588

1991

DOI: 10.1594/pangaea.759588

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Cretaceous-Paleogene biomagnetostratigraphy of ODP Leg 121 sites

James J Pospichal¹,

J. Dehn²,

Neal W. Driscoll³

et al.

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Cretaceous-Paleogene Biomagnetostratigraphy of Sites 752-755, Broken Ridge: A Synthesis

Pospichal¹,

Dehn²,

Driscoll³

et al. 1991

Proceedings of the Ocean Drilling Program

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Broken Ridge, in the eastern Indian Ocean, is a shallow-water volcanic platform which formed during the Early to middle Cretaceous at which time it comprised the northern portion of the Kerguelen-Heard Plateau. Rifting during the middle Eocene and subsequent seafloor spreading has moved Broken Ridge about 20°N to its present location. The sedimentary section of Broken Ridge includes Turonian-lower Eocene limestone and chalk with volcanic ash, an interval of detrital sands and gravels associated with middle Eocene rifting and uplift, and a middle-late Oligocene unconformity overlain by a thin section of Neogene-Holocene pelagic calcareous ooze. This paper summarizes the available post-cruise biostratigraphic and magnetostratigraphic data for the Cretaceous-Paleogene section on Broken Ridge. The synthesis of this information permits a more precise interpretation of the timing of events in the history of Broken Ridge, in particular the timing and duration of the middle Eocene rifting event. Paleontologic data support rapid flexural uplift of Broken Ridge in response to mechanical rather than thermal forces. Other highlights of the section include a complete Cretaceous/Tertiary boundary and an opportunity for first-order correlation of Paleogene diatom stratigraphy with that of the calcareous groups.Weissel, J., Peirce, J., Taylor, E., Alt, J., et al., 1991. Proc. ODP, Sci. Results, 121: College Station, TX (Ocean Drilling Program).

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Cretaceous-Paleogene Biomagnetostratigraphy of Sites 752-755, Broken Ridge: A Synthesis

Pospichal¹,

Dehn²,

Driscoll³

et al. 1991

Proceedings of the Ocean Drilling Program

View full text Add to dashboard Cite

show abstract

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Cretaceous-Paleogene biomagnetostratigraphy of ODP Leg 121 sites

Cited by 1 publication

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Cretaceous-Paleogene Biomagnetostratigraphy of Sites 752-755, Broken Ridge: A Synthesis

Cretaceous-Paleogene Biomagnetostratigraphy of Sites 752-755, Broken Ridge: A Synthesis

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