NDLI: REE and ε $_{Nd}$ of clay fractions in sediments from the eastern Pacific Ocean: Evidence for clay sources

Content Provider	Springer Nature Link
Author	Liu, Jihua Shi, Xuefa Chen, Lirong Huang, Yongyang Wang, Yinxi Cui, Yingchun Bu, Wenrui
Copyright Year	2005
Abstract	Clay fractions in the non-calcareous surface sediments from the eastern Pacific were analyzed for clay minerals, REE and $^{143}$Nd/$^{144}$Nd. Montmorillonite/illite ratio (M/I ratio), total REE contents (ΣREE), LREE/HREE ratio and cerium anomaly (δCe) may effectively indicate the genesis of clay minerals. Clay fractions with M/I ratio <1, δCe >0.85, ΣREE <400 μg/g, LREE/HREE ratio ≈4, and REE patterns similar to those of pelagic sediments are terrigenous and autogenetic mixed clay fractions and contain more autogenetic montmorillonite. Clay fractions with M/I ratio >1, δCe=0.86 to 1.5, ΣREE=200 to 350 μg/g, LREE/HREE ratio ≈6 and REE distribution patterns similar to that of China loess are identified as terrigenous clay fraction. The $^{143}$Nd/$^{144}$Nd ratios or $_{ɛNd}$ values of clay fractions inherit the features of terrigenous sources of clay minerals. Clay fractions are divided into 4 types according to $_{ɛNd}$ values. Terrigenous clay minerals of type I with the $_{ɛNd}$ values of ™8 to ™6 originate mainly from North American fluvial deposits. Those of type II with the ε Nd values of ™9 to ™7 are mainly from the East Asia and North American fluvial deposits. Those of type III with ε Nd values of ™6 to ™3 could come from the central and eastern Pacific volcanic islands. Those of type IV with ε Nd values of ™13 to ™12 may be from East Asia eolian. The terrigenous and autogenetic mixed clay fractions show patchy distributions, indicating that there are volcanic or hot-spot activities in the eastern Pacific plate, while the terrigenous clay fractions cover a large part of the study area, proving that the terrigenous clay minerals are dominant in the eastern Pacific.
Starting Page	701
Ending Page	712
Page Count	12
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	48
Issue Number	5
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2005-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	eastern Pacific Ocean clay fraction REE $_{εNd}$ clay source Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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