Other
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..90..395k&link_type=abstract
Earth and Planetary Science Letters, Volume 90, Issue 4, p. 395-410.
Other
11
Scientific paper
The size of various Phanerozoic paleoceans, determined from paleogeographic maps, provides a framework for assigning ɛNd measurements of primary authigenic marine minerals to individual paleoceans and for establishing their ɛNd versus age curves. We report new ɛNd data (in the range from 80 to 750 Ma) for the largest Phanerozoic and Late Precambrian paleocean, the Pacific/Panthalassa Ocean (PPO), and limited data on some small Paleozoic paleoceans. These new data and all other published data on paleocean ɛNd values are used to determine the trends through time of ɛNd in seven Phanerozoic paleoceans. The variations in paleocean ɛNd curves are due to changes in the rate of crustal additions and in paleoceanic geometry. From these data we can calculate a mean ɛNd curve and a mean Nd model age curve for Phanerozoic seawater. These curves show large variations with age and reflect the variations of ɛNd in erosion products from the continents as a function of age. The high erosion rates of young, uplifted areas enhance ɛNd and Nd model age variations of Phanerozoic seawater. This makes it difficult to quantitatively recover crustal addition rates from these curves; however, it makes the episodic nature of continental additions more evident.
Jacobsen Stein B.
Keto Lisette S.
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