Ichthyolith Biostratigraphy of Western North Pacific Pelagic Clays, Deep Sea Drilling Project Leg 86

Doyle, P. S.; Riedel, W. R.

doi:10.2973/dsdp.proc.86.112.1985

Cited by 10 publications

(14 citation statements)

References 11 publications

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“…Iridium anomalies occur in Holes 576 and 576B . The anomalies are ~1 m above calcareous turbidites containing Cretaceous foraminifera (Heath et al, 1985) and within a ~5-m interval that should contain the K/T boundary, based on ichthyolith biostratigraphy (Doyle and Riedel, 1985). The Ir fluences and the depths of the Ir anomaly peaks are somewhat different in the two holes: 130 ng/cm 2 at 54.5 mbsf in 576 and 90 ng/cm 2 at 54.0 mbsf in 576B.…”

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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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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“…We acknowledge that these results are dependent on the age model used at each location. Several age models based on different dating techniques have been developed for LL44‐GPC3 [ Doyle and Riedel , 1985; Kyte et al , 1993; Gleason et al , 2002, and references therein] and show minimal contrasts for sediment younger than ∼20 Ma and rather significant contrasts for early Oligocene and late Eocene sediment [e.g., Gleason et al , 2002]. Considering these contrasts and correlating Site 1215 to LL44‐GPC3, there is a ∼2°–2.5° and ∼0.5°–1° northward shift in Site 1215 and LL44‐GPC3 respectively.…”

Section: Geochemical Evolution Of the Central Pacificmentioning

confidence: 99%

Geochemical evolution of the central Pacific Ocean over the past 56 Myr

Ziegler

Murray

2007

Paleoceanography

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[1] We measured the elemental concentrations of 69 sediment samples collected at Ocean Drilling Program Site 1215 and employed a suite of statistical methods and elemental ratios to quantify the lithogenic, biogenic, and authigenic/hydrogenous/hydrothermal (AHH) components. We show that the changes in their abundance record (1) northwestward migration of the Pacific Plate, (2) changes in climatic and oceanographic processes associated with the transition from the Eocene ''greenhouse'' into the Oligocene ''icehouse,'' and (3) changes in Pacific spreading rates and plate reorganization. The distributions of three separate lithogenic end-members depend on the latitudinal positioning of the site underneath the different wind belts. Locations north of 22°N received material from Asia, which was transported to the central Pacific via the westerlies. Locations between 20°and 22°N display a silicic volcanic composition and may reflect the boundary between westerlies and northeast trade winds. Locations south of 20°N are geochemically (e.g., Cr/Ta, Sc/Th, etc.) distinct from locations north of 22°N and suggest a North American origin. Rb/Sc significantly increases from values of 2.8 g g À1 at $20-22 Ma to 5.7 g g À1 in the modern, recording the development of the east Asian monsoon and formation of Asian loess. During the early to mid-Eocene (53-54 Ma), when Site 1215 was located at $11°-13°N and was above the carbonate compensation depth, export production increased by 40-55% and was $25% greater than the modern value at 9°N. The AHH component dominated from late Eocene to the late Miocene and during the late Eocene may have been driven by elevated hydrothermal activity during increased seafloor spreading.

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“…9) is overlain by a probable thrusted unit containing a sandstone bed at 1231 m and reworked Oligocene zone 1 "angled cone and basal canals" and Paleocene -early Eocene interval E cf. "triangle curved margin ends" (Doyle and Riedel 1985b) ichthyoliths, succeeded by typical Miocene zone 4 ichthyoliths. In Prometheus H-68 (unit 9, Fig.…”

Section: Miocene and Pliocene Ichthyolithsmentioning

confidence: 99%

Cenozoic ichthyolith biostratigraphy: Tofino Basin, British Columbia

Johns¹,

Barnes²,

Narayan³

2006

Can. J. Earth Sci.

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Five new late Eocene -Pliocene ichthyolith zones are defined based on indigenous faunal occurrences in strata that outcrop along western Vancouver Island and samples from six offshore Tofino Basin wells. Five new interval zones are each defined based on distinct transported ichthyolith assemblages. Results are correlated within the framework of established Cenozoic west coast and Arctic foraminifer zones and ichthyolith occurrences in deep-sea core samples and Cretaceous Queen Charlotte Group and Nanaimo Group strata of coastal British Columbia. The use of multiple data sets was important to interpret complex active tectonic margin sedimentation and structures. The integrated ichthyolith and foraminifer biostratigraphy allowed an interpretation of well log data and lithology reports. Also, we reassessed previous offshore seismic data, evaluated fossil preservation and thermal alteration, and distinguished transported from indigenous ichthyolith occurrences. These data allowed a reinterpretation of tectonic segments and associated strata of the Pacific Rim and Crescent terranes and the Cascadia Accretionary Complex onshore and offshore Vancouver Island.

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Ichthyolith Biostratigraphy of Western North Pacific Pelagic Clays, Deep Sea Drilling Project Leg 86

Cited by 10 publications

References 11 publications

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

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

Geochemical evolution of the central Pacific Ocean over the past 56 Myr

Cenozoic ichthyolith biostratigraphy: Tofino Basin, British Columbia

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