Zircon U-Pb Age of the Dachazi Syenogranitein Duobaoshan Area, Heilongjiang Province: Geological Implication

详细信息   

• 责任者：Dai Yu (Heilongjiang Institute of Geological Survey ; Harbin 161005 ; China) ; Liu Jiangling
• 刊名：Geology and Resources
• 出版年：2012
• 卷期：21(2)
• 关键词：花岗岩 ; granite ; 黑龙江省 ; Heilongjiang Province
• 页码：p.188-193
• 图表：3 illus., 13 tables, 4 refs.
• 分类号：0801
• issnNo：ISSN1671-1947
• isbnNo：CN21-1458/P

摘要

The geochronology with zircon SHRIMP U-Pb isotope of the Dachazi syenogranite, cropped in Duobaoshan area, Heilongjiang Province, is studied to find out its age and geological background. The result suggests that the zircon has significant zonal structure, with Th/U ratio of 0.41~0.99, which is a typical granitic magma-type zircon. Zircons in the syenogranite from 11 observation points are analyzed, obtaining the weighted average ²⁰⁶Pb/²⁵³U age of 345＋3 Ma （n = 11, SMWD = 0.99）, which represents the crystallizing age of the syenogranite, showing the formation age of Early Carboniferous. The analysis on the major elements and geochemistry shows that the syenogranite belongs to high potassium cale-alkaline series. genetically as A-type granite.