Geochronology of Baogutu porphyry copper deposit in Western Junggar area,Xinjiang of China |
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Authors: | YuLin Liu LiShuang Guo YuDe Liu HuiXia Song Biao Song Rui Zhang FaJun Xu YunXiao Zhang |
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Institution: | LIU YuLin1,4,GUO LiShuang1,LIU YuDe2,SONG HuiXia3,SONG Biao3,ZHANG Rui5,XU FaJun5 & ZHANG YunXiao5 1 The Key Laboratory of Orogenic Belt , Crustal Evolution,MOE,Peking University,Beijing 100871,China,2 North China Institute of Science , Technology,Beijing 101601,3 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,4 Beijing SHRIMP Center,5 Institute of Geology,Xinjiang Nonferrous Geo-exploration Bureau,Urumqi 830000,Ch... |
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Abstract: | Baogutu copper deposit in Western Junggar area is a mesoscopic porphyry deposit found in recent years. Study on its geochronology
will help further understand ore genesis and regional ore-forming pattern. A series of small quartz-diorite and granodiorite
stocks outcrop at Baogutu area, numbered I–X according to their size. A detailed exploration on Number V stock confirmed it
as a mesoscopic scale copper deposit, and various exploration work has been carried out on other stocks with ore-forming evidence.
This paper studies geochronology of Number V stock using zircon SHRIMP U-Pb and single mineral K-Ar method. Twenty-five SHRIMP
ages yield two 206Pb/238U weighed mean ages of 335.6 ± 7.8 Ma and 311.4 ± 3.3 Ma respectively. The older date is considered to be inherited zircon
from either surrounding rock tuff or deep granitoid batholith, whereas the younger date is the formation age of ore-bearing
intrusion. K-Ar ages of ore-forming biotites, 296.0 ± 3.7 Ma and 297.3 ± 3.8 Ma, in combination with Re-Os age of molybdenite,
310 Ma, confirm the ore-forming age of 310?296 Ma. Granophyre and dioritic porphyrite dikes cut Number V stock and their K-Ar
ages range from 278 to 240 Ma, which confine the lower boundary of the mineralization. The framework of Baogutu ore-forming
geochronology can be established based on these data. |
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Keywords: | Baogutu porphyry copper deposit U-Pb K-Ar geochronology |
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