The Rock- and Ore-forming Ages of the Laochang Porphyry Molybdenum Deposit in Lancang, Yunnan

Geoscience ›› 2009, Vol. 23 ›› Issue (6): 1049-1055.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

The Rock- and Ore-forming Ages of the Laochang Porphyry Molybdenum Deposit in Lancang, Yunnan

LI Feng¹, Lu Wen-Ju², Yang Ying-Zhong³, Chen Hui¹, Luo Si-Liang¹, SHI Zeng-Long³

1 Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan650093, China；
2 Chuxiong Exploration Institute of Nonferrous Geology of Yunnan, Chuxiong, Yunnan675000, China；
3 Lancang Lead Mine of Yunnan，Lancang, Yunnan665601，China

Received:2009-06-26 Revised:2009-10-28 Online:2009-12-29 Published:2012-02-16

Abstract

Abstract:

The Laochang region in western Yunnan is one of the areas with significant breakthrough for new discovery of great thick porphyry molybdenum ore bodies in the deep since 2008. On the basis of the analysis to mineralizing system texture, the rock- and ore-forming ages of the granite-porphyry and related molybdenum ores were precisely redefined by the SHRIMP zircon U-Pb and molybdenite Re-Os dating method. The results show that the age of ore-forming graniteporphyry is (44.6±1.1)Ma, and the Re-Os isochron of molybdenites is (43.78±0.78)Ma. It is suggested that a largescale Mo(Cu)-mineralization exists in this region, which related to Himalayan concealed granite-porphyry，and consistent with the peak period of Cenozoic magmatism-mineralization in forming ages, and formed in intracontinental collision orogenic setting.

Key words: porphyry molybdenum deposit, rock-and ore-forming ages, SHRIMP zircon U-Pb dating, molybdenite Re-Os dating method, Laochang in Lancang, Yunnan

CLC Number:

P618.65

LI Feng,Lu Wen-Ju, Yang Ying-Zhong, Chen Hui, Luo Si-Liang, SHI Zeng-Long. The Rock- and Ore-forming Ages of the Laochang Porphyry Molybdenum Deposit in Lancang, Yunnan[J]. Geoscience, 2009, 23(6): 1049-1055.

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The Rock- and Ore-forming Ages of the Laochang Porphyry Molybdenum Deposit in Lancang, Yunnan

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