2012, 31(1) 68-76 DOI:     ISSN: 1004-5589 CN: 22-1111/P
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Keywords
porphyry molybdenum deposit
Re-Os dating
explosive breccia pipe
Dashihe molybdenum deposit
Dunhua
Jilin Province
Authors
JU Nan-1
REN Yun-Sheng-1
WANG Chao-2
WANG Hui-1
ZHAO Hua-Lei-1
QU Wen-Jun-3
PubMed
Article by Ju, N. 1
Article by Lin, Y. S. 1
Article by Wang, C. 2
Article by Wang, H. 1
Article by Diao, H. L. 1
Article by Qu, W. J. 3

Ore genesis and molybdenite Re-Os dating of Dashihe molybdenum deposit in Dunhua��Jilin

JU Nan-1, REN Yun-Sheng-1, WANG Chao-2, WANG Hui-1, ZHAO Hua-Lei-1, QU Wen-Jun-3

1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Wangqing Huaxin Mining Co�� Ltd�� ��Wangqing 133212��Jilin��China; 3. National Research Center of Geoanalysis��Academy of Geological Sciences��Beijing 100037��China

Abstract��

Dashihe deposit is one of the large-size molybdenum deposits recently discovered in the southern margin of Xiaoxinganling--Zhangguangcailing molybdenum metallogenic belt�� Deep ore bodies in this deposit are located in the top of porphyaceous granodiorite��veinlet-disseminated in shape�� The near-surface ore bodies mainly occurred in the low-grade metamorphic rocks as molybdenite-bearing quartz veins�� Molybdenum mineralization was controlled by the explosive breccia pipe and the fissures��and the mineralization and alteration are obvious in zonaition�� belonging to porphyry molybdenum deposit�� Re-Os dating of five molybdenite samples collected from the shallow ore bodies showed that the model ages as 182. 1 ± 2. 7 Ma �� 191. 9 ± 2. 6 Ma��with the weighted mean age of 186. 7 ± 5. 0 Ma��and MSWD = 11. 8��which indicates the deposit formed in Early Yanshanian�� Combined with other obtained lithogenic and metallogenic ages from the Xiaoxinganling--Zhangguangcailing molybdenum metallogenic belt��it can be inferred that 160 �� 190 Ma is a concentrated period for large-scale molybdenum mineralization of this belt�� The content of Re in the molybdenite is 3. 549 �� 4. 362 μg·g �� 1��indicating ore-forming materials derived from crustal sources�� Comprehensive analysis showed that the Dashihe deposit might be resulted by the largescale mineralization events of the Early Yanshanian in the area��and formed in the tectonic environment during the superposition and transformation of Paleo-Asian and Circum-Pacific tectonic domains��

Keywords�� porphyry molybdenum deposit   Re-Os dating   explosive breccia pipe   Dashihe molybdenum deposit   Dunhua   Jilin Province  
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