super(40)Ar- super(39)Ar dating of quartz from ore in the baiyangping Cu-Co polymetallic ore-concentrated area, Lanping Basin, Yunnan

super(40)Ar- super(39)Ar fast neutron activation age spectrum of quartz in ore collected from the Baiyangping Cu-Co polymetallic ore-concentrated area, Lanping Basin, is saddle-shaped. The plateau age, minimum appearance age and isochron age shown on the spectra are 56.53 plus or minus 0.43 Ma, 55.5...

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Bibliographic Details
Published in:Chinese journal of geochemistry 2004-10, Vol.23 (4), p.342-348
Main Authors: Mingqin, He, Jiajun, Liu, Chaoyang, Li, Zhiming, Li, Yuping, Liu, Aiping, Yang, Haiqing, Sang
Format: Article
Language:English
Subjects:
Age
Basins
CONCENTRATES
Copper
Dating
FORMING
MINERAL DEPOSITS
ORES
QUARTZ
SPECTRA
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Summary:super(40)Ar- super(39)Ar fast neutron activation age spectrum of quartz in ore collected from the Baiyangping Cu-Co polymetallic ore-concentrated area, Lanping Basin, is saddle-shaped. The plateau age, minimum appearance age and isochron age shown on the spectra are 56.53 plus or minus 0.43 Ma, 55.52 plus or minus 1.78 Ma and 55.90 plus or minus 0.29 Ma respectively. The age data are consistent with each other within 1 sigma uncertainties. Because the given initial super(40)Ar/ super(36) Ar value of 294.7 plus or minus 1.14 is very close to Nier's value (295.5 plus or minus 5), both plateau and isochron ages may be considered as the forming time of quartz. So the age of 55.90-56.53 Ma represents the forming age of ore deposits. It is obvious that the ore deposits were formed during the Early Himalayan period.
ISSN:1000-9426
1993-0364
DOI:10.1007/BF02871306