Abstract
The Hannuoba basalts are a suite of associated rocks consisting of alkali basalts and tholeiites. The alkali basalts can be divided into the K-rich type and the Na-rich type, while the tholeiites are almost solely of the Na-rich type. These two types of basalt are characterized as being obviously rich in light rare earth elements, as is shown in the chondrite-normalized REE patterns exhibiting positive Eu anomalies. However, significant differences in (La / Yb)N and Eu / Eu* ratios are noticed between these two types of basalt. They seem to have been derived from varying-degree partial melting of mantle rocks.
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Shaobing, L., Delin, L., Zhenjiang, Z. et al. REE compositional characteristics of Hannuoba basalts. Chin. J. of Geochem. 7, 243–251 (1988). https://doi.org/10.1007/BF02840966
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DOI: https://doi.org/10.1007/BF02840966