LA-ICP-MS Zircon U-Pb Dating of Haji Granite and Inclusions from Mayile Area in Western Junggar, Xinjiang
详细信息
- 责任者：Wang Yabing (Gansu Institute of Land Resources Planning and Research ; Lanzhou 730000 ; China) ; Wang Zhenhua
- 刊名：Gansu Geology
- 出版年：2013
- 卷期：22(3)
- 关键词：侵入体 ; intrusions ; 岩石包体 ; rock inclusions ; 铀—铅计时 ; U-Pb dating ; 准噶尔盆地 ; Junggar Basin
- 页码：p.12-18
- 图表：4 illus., 1 table, 27 refs.
- 分类号：0801
- issnNo：ISSN1004-4116
- isbnNo：CN 62-1191/P
摘要
LA-ICP-MS zircon U-Pb dating of the Haji grantite and its enclaves in the Mayile area of the Western Jungaar indicates that the isotopic age of granite is 278±3Ma(MSWD=0.43),and its enclaves is 291± 4Ma(MSWD=0.32).It suggests that granite and enclave should be formed at the same period.Enclaves formed from magma mixing,that is say,cool magnesium-iron magma mixing into neutrality-acidity magma,fast cooling formed it.In process of magma mixing,basic magma of enclaves and acid magma of host rock changed the ingredient by chemistry proliferation,enclaves with granite magma by assimilation and transformation.This is the reason why Haji granite and its enclaves have the same geologic time.Haji granite formation times belongs to range(330~265Ma) of post-collision magma activity in West Jungaar,and its formation and evolution stands for continental crustal growth that by post-collision magma underplating in West Jungaar.
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