Summary of Cretaceous/Tertiary Boundary Studies, Deep Sea Drilling Project Site 577, Shatsky Rise

Wright, Audrey A.; Bleil, Ulrich; Monechi, Simonetta; Michel, Helen V.; Shackleton, N. J.; Simoneit, Bernd R.T.; Zachos, James C

doi:10.2973/dsdp.proc.86.138.1985

Cited by 9 publications

(12 citation statements)

References 7 publications

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“…As shown in Figure 13, both the stable inclinations around 379.9 mbsf, below the Cretaceous/Tertiary boundary, and the data between 376.3 and 375.8 mbsf, above the boundary, show reversed magnetic polarity. A reversed polarity at the Cretaceous/Tertiary boundary has been found at DSDP Site 577 (Wright et al, 1985) and is expected from the time scale of Berggren et al (1985). Therefore, we can correlate the reversed interval between 375.8 and 379.9 mbsf to the reversed Chron C29R.…”

Section: Hole 738csupporting

confidence: 54%

Paleomagnetism of Leg 119-Holes 737A, 738C, 742A, 745B, and 746A

Sakai¹,

Keating²

1991

Proceedings of the Ocean Drilling Program

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ODP Leg 119 drilled on the Kerguelen Plateau in the southern Indian Ocean and in Prydz Bay, Antarctica. A geomagnetic polarity zonation for the late Miocene to the Quaternary has been determined from the sediments of the Kerguelen Plateau. Hole 745B on the south Kerguelen Plateau provided the excellent reversal sequence for the last 6 Ma including the Cobb Mountain event in the Matuyama Chron and the unidentified subchron in the Gilbert Chron. Hole 738C drilled a complete Cretaceous/Tertiary boundary. The volume magnetic susceptibility measurement around the Cretaceous/Tertiary boundary shows high values at the iridium-concentrated region. This supports the results by Worm and Banerjee (1987) that the high susceptibility and indium concentration coincide at about the Cretaceous/Tertiary boundary. The limestone sequence at Hole 738C from the Turonian to Santonian stage shows a low paleolatitude (54°S) compared to the present (64°S). This paleolatitude is nearly same as the Tertiary paleolatitude estimated from paleomagnetic poles of Antarctica. At Hole 742C in Prydz Bay, a glacial sequence was penetrated to a depth of 316 mbsf. The magnetic susceptibility of this sequence correlated well with changes of lithology. The magnetic inclinations of the sequence from the middle Eocene to the Oligocene indicated a dominant normal polarity zone containing several short reversals.

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Section: Hole 738csupporting

confidence: 54%

Paleomagnetism of Leg 119-Holes 737A, 738C, 742A, 745B, and 746A

Sakai¹,

Keating²

1991

Proceedings of the Ocean Drilling Program

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“…Michel et al (1985) reported a broad Ir anomaly with a net Ir fluence of 61 ng/cm 2 in Hole 577B. The K/T boundary at Site 577 has been the subject of numerous studies of its paleontologic, mineralogic, isotopic, and geochemical composition (e.g., Wright et al, 1985;Smit and Romein, 1985;Gerstel et al, 1986;Zachos and Arthur, 1986). This boundary sequence is bioturbated and contains abundant spherules.…”

Section: K/t Boundary Sites In the Pacificmentioning

confidence: 97%

The Cretaceous-Tertiary boundary on the Pacific plate: Composition and distribution of impact debris

Kyte¹,

Bostwick²,

Zhou³

1996

The Cretaceous-Tertiary Event and Other Catastrophes in Earth History

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“…Deep Sea Drilling Project site 577 is located in 2700 m of water on the Shatsky Rise in the northwest Pacific Ocean. Our samples came from Hole 577, which was hydraulically piston cored and yielded a K/T boundary within a white calcareous nannofossil ooze sequence (Wright et al, 1985). The boundary was identified from nannoplankton stratigraphy (Monechi et al, 1985), and a iridium anomaly was found in Hole 577B (Michel et al, 1985) at a stratigraphic level equivalent to the nannoplankton boundary in Hole 577.…”

Section: Sampled Locationsmentioning

confidence: 99%

Global comparisons of organic matter in sediments across the Cretaceous/Tertiary boundary

Meyers

Simoneit

1990

Organic Geochemistry

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A~tract-The Cretaceous/Tertiary (K/T) boundary is marked by extensive changes in the sedimentary fossil record of continental and marine life. Organic matter in sediments from above and below the K/T boundary has been studied to identify consequences of the biotic extinctions and of the changes in biological productivity which occurred at this time. Data from locations encompassing a variety of marine paleoenvironments were examined to assess the global extent and local expressions of these biological changes. Characterizations of organic matter included Rock-Eval pyrolysis, stable carbon isotope ratios, and distributions of extractable biomarkers. In general, organic carbon concentrations are a few tenths of a percent in the chalks and marls above and below the K/T boundary; in some boundary clay samples concentrations up to 5% are found. The elevated amounts near the boundary result from oxidation of marine organic matter, consequent dissolution of carbonates, and concentration of the surviving organic matter. At all locations, the organic matter has been microbially reworked and evidently was deposited in oxidizing environments. Carbon isotope shifts in open marine sediments suggest biological productivity was depressed following the K/T boundary. Repetition of these changes at different locations verifies the global extent of the boundary event, yet local variations in its expression are evident.

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Summary of Cretaceous/Tertiary Boundary Studies, Deep Sea Drilling Project Site 577, Shatsky Rise

Cited by 9 publications

References 7 publications

Paleomagnetism of Leg 119-Holes 737A, 738C, 742A, 745B, and 746A

Paleomagnetism of Leg 119-Holes 737A, 738C, 742A, 745B, and 746A

The Cretaceous-Tertiary boundary on the Pacific plate: Composition and distribution of impact debris

Global comparisons of organic matter in sediments across the Cretaceous/Tertiary boundary

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