Abstract
The Lower Carboniferous Series Yamansu Formation volcanic rocks in eastern Tianshan are composed of basic and neutral-acid rock types, and defined as the calc-alkaline series. These volcanic rocks have the features of the typical island-arc or the continental marginal arcs. The result of the Rare Earth Elements shows that the negative anomaly of the Nb, Sr, P and Ti in the neutral-acid rocks, and it might be caused by the continental crust involved. The REE changes curves lean to the right smoothly. The LREE is enrichment and δEu is negative anomaly show that the rocks could have the same source, and the magma could go through the strongly fractional crystallization processes. The fault belt and the volcanic and sedimentary formation controlled regional mineralization. The metallogenic materials are enriched surrounding the rock mass. The stratum are abundant of copper and zinc, so that is very important to study its geological and geochemistry features in this area.
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