Abstract:

This paper focuses on the Laojunshan tin poly-metallic metallogenic region and studies the geological processes related to
ore forming processes such as volcaniclastic sedimentation in early Caledonian, regional metamorphism in Indo-China period,
superimposed late Yanshanian granitic process magmatism. Three types of metallogenic series were recognized, and each kind of
metallogenic series has different REE distribution patterns. Type Ⅰ. Volcaniclastic sedimentation in early Caledonian-regional
metamorphism in Indo-China period metallogenic series in the northeastern part of the study area have the similar REE distribution
patterns with marine extrusive-sedimentation rocks (island-arc tholeiite type). Type Ⅱ. Volcaniclastic sedimentation in early
Caledonian-regional metamorphism in Indo-Chinese epoch metallogenic series, near the granite contact zones, the REE distribution
patterns show the coexistence of marine extrusive-sedimentation rocks and granites. Type Ⅲ. Superimposed granitic metallogenic

series of the late Yanshanian epoch have the similar REE distribution patterns with those of granites.

Key words: REE, metallogenic series, ore genesis, Laojunshan tin poly-metallic metallogenic region