Abstract

The mineralized stock of the Hobenzan granitic complex is composed of tonalite and a continuous differentiation series of biotite-hornblende granodiorite, hornblende biotite granite and biotite granite. Texture and mineral chemistry of the Fe-Ti oxide minerals in the Hobenzan granitic complex exhibit two different processes of magma evolution: one is an oxyexsolution process related to the magmatic and high temperature subsolidus stage, and the other is a reduction process of consecutive subsolidus stage. Rocks distributed in the northern part of the granitic complex preserve well the oxyexsolution process and show higher magnetic susceptibility, whereas those in the southern part of the complex, record the reduction process and show lower magnetic susceptibility.

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