By Douglas F. Williams
ISBN-10: 0127545603
ISBN-13: 9780127545608
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Extra resources for Isotope Chronostratigraphy. Theory and Methods
Example text
First, we examine examples for the entire Tertiary, and then we look at details of the Tertiary records by epoch. We also demonstrate the potential of using the Tertiary isotope signals for stratigraphie correlations and interpretations of exploration wells. I. Development of the Tertiary Isotope Record The historical development of our understanding of the Tertiary isotope record is closely tied to the Deep Sea Drilling Project and to efforts to understand the paleoceanographic history of the ocean.
The magnitude of this PaleoceneEocene shift is larger than that across the Cretaceous-Tertiary boundary and nearly equal to that from the middle Miocene to the Pleistocene. 54 5. The Tertiary Carbon Isotope Record The large carbon isotope change across the Cretaceous-Tertiary boundary has been attributed to a dramatic decrease in marine productivity as a result of a catastrophic impact (Hsu et al, 1982; Zachos et αϊ, 1985; Alvarez et l3 al, 1980). The very positive 8 C values in the late Paleocene have been 1 3 attributed to a very steep surface to deep-water 5 C gradient as a result of enhanced productivity and photosynthetic removal of carbon (Shackleton and Hall, 1984b; Shackleton, 1985).
A significant isotopic enrichment of nearly 1%> was found to occur at or near the Eocene-Oligocene boundary recorded in both benthic and planktonic foraminifera (Figs. 17 and 18). This event was heralded as a major océanographie event signaling the development of cold bottom water formation and vigorous circulation in the oceans. 5-3%> enrichment in δ 0 values that occurs in the Neogene (mid-Miocene to Pleistocene). Many Fig. 26. Location map showing the approximate location of the D S D P sites, paleomagnetically dated piston cores, and other sediment sections from which detailed stable isotopic data are available.
Isotope Chronostratigraphy. Theory and Methods by Douglas F. Williams
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