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Scientific Communications |
Mineral and Fuel Resources Department, Geological Survey of Japan, Higashi 1-1-3, Tsukuba, 305-8567 Japan
AIRIE Program, Department of Earth Resources, Colorado State University, Fort Collins, Colorado 80523-1482
Corresponding author: e-mail,
watanabe{at}gsj.go.jp
The Erdenet and Tsagaan Suvarga deposits are the two
largest known porphyry Cu-Mo deposits in Mongolia. Replicate Re-Os analyses
of molybdenite from these deposits yield ages of 240.7 ± 0.8 and 240.4 ±
0.8 Ma for Erdenet and 370.1 ± 1.2 and 370.6 ± 1.2 Ma for Tsagaan Suvarga
(2
errors). The Re-Os age of Erdenet is significantly older and that of
Tsagaan Suvarga is slightly older than published 40Ar/39Ar
ages for sericite associated with mineralization in these deposits (207.4 ±
5.0 and 364.9 ± 7.0 Ma, respectively). These Re-Os results suggest that in
the hydrothermal environment, 40Ar/39Ar ages may be
partly to significantly reset, whereas Re-Os ages record and maintain the
age of primary mineralization events.
These Re-Os ages indicate that porphyry mineralization at Erdenet and Tsagaan Suvarga are related to porphyritic intrusions representing the youngest event during regional magmatism in northern and southern Mongolia, respectively. The Re-Os age of Erdenet marks the final stage of arc magmatism in northern Mongolia, followed by Late Permian collision between the Mongolian-North China and Siberian blocks. The Re-Os age of Tsagaan Suvarga indicates that Devonian arc magmatism in southern Mongolia was active at the present latitude of 44° N at least until 370 Ma.
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