| SHRIMP zircon U-Pb dating and its geological significance of Chibaisong gabbro in Tonghua area,Jilin Province,China |
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| 摘 要： | The basic dykes are widely distributed in the Tonghua area, among which the Chibaisong No.1 gabbro has attracted many geologists’ attention to the copper-nickel sulfide deposit within it. However, its formation time has been controversial all the time. Most geologists considered that it could be formed at the late Archean or the Paleoproterozoic1]1), while some other geologists contended that it might be formed in early Yanshannian of Mesozoic2). The forming time of the basic dyke swarm i…
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| 收稿时间： | 30 December 2004 |
| 修稿时间： | 28 February 2005 |
SHRIMP zircon U-Pb dating and its geological significance of Chibaisong gabbro in Tonghua area, Jilin Province, China |
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| Authors: | PEI Fuping XU Wenliang YANG Debin ZHAO Quanguo |
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| Institution: | College of Earth Sciences, Jilin University, Changchun 130061, China |
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| Abstract: | SHRIMP zircon U-Pb dating for Chibaisong No.1 gabbro in the Tonghua area, Jilin Province, is discussed in the paper. The cathodoluminescence
(CL) images of the zircons indicate that they can be divided into two major types, i.e. euhedral-subhedral one with striped
absorption and round one with obvious oscillatory zoning rims. The dating results of the zircons suggest that Chibaisong gabbro
in the Tonghua area was formed at 134 ± 7Ma—the Early Cretaceous. The concordia ages of 2497 ± 13Ma, 787 ± 35Ma, 321 ± 10Ma,
217 ± 11Ma of zircons imply that the Tonghua area might geologically be located in the convergent region of the Yangtze Block
(YB) and the North China Block (NCB) in the early Mesozoic and the zircons should be caught during magma intrusion. The existence
of the Early Cretaceous basic dyke swarm in the Tonghua area shows that an intensive extensional environment occurred in the
Early Cretaceous. It is suggested that the magmatism and lithospheric extension in the Tonghua area should be related to the
subduction of the Pacific plate. |
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| Keywords: | zircon gabbro SHRIMP U-Pb dating Tonghua area |
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