Characteristics of Rare Earth Elements and Geological Significations of BIFs from Jidong, Wutai and Lüliang Area

Abstract

Abstract:

The results of rare earth elements of banded iron formations samples from East Hebei Province,Wutai and Lüliang of Shanxi Province are reported in this article. Analytic results show that the BIFs have the similar characteristics: REE concentrations in BIFs are very low; the shale-normalised REE+Y patterns display depletion of light REE relative to heavy REE, high Y/Ho values and distinct positive anomalies of Eu, Y, and La. These demonstrate that the BIFs are the products of chemical sedimentation from paleo-seawater with significant input of volcanic hydrothermal fluids. Although BIFs are characterized by positive Eu anomalies, BIFs of the different type and different age show different size of positive Eu anomalies. Compared with superior BIF from Lüliang area, Algoma BIF from Jidong and Wutai shows the higher positive Eu anomalies. The Eu anomalies decreased from Middle archean-Neoarchean to Paleoproterozoic BIFs and this decrease in the positive Eu anomaly with depositional age might argue for a decrease of high-temperature hydrothermal activity. The lack of negative Ce anomalies in almost of BIFs samples indicates relatively low redox levels in the local seawater.

Key words: Jidong area, Wutai area, Lüliang area, BIF, REE, depositional environment

CLC Number:

P618.31
P595

LI Zhi-Hong, ZHU Xiang-Kun, TANG Suo-Han, LI Jin, LIU Hui. Characteristics of Rare Earth Elements and Geological Significations of BIFs from Jidong, Wutai and Lüliang Area[J]. Geoscience, 2010, 24(5): 840-846.

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