Petrogenesis of the Paleoproterozoic K-Feldspar Granites in Bengbu Uplift: Constraints from Petro-Geochemistry, Zircon U-Pb Dating and Hf Isotope

• 责任者：Yang Debin (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Xu Wenliang
• 刊名：Earth Science
• 出版年：2009
• 卷期：34(1)
• 关键词：花岗岩 ; granite ; 安徽 ; Anhui
• 页码：p.148-164
• 图表：11 illus., 3 tables, 58 refs.
• 分类号：0801
• issnNo：ISSN1000-2383
• isbnNo：CN42-1233/P

The study on the chronology, geochemistry and zircon Hf isotopes of the Zhuangzili and Mopanshan K-feldspar granites in Bengbu uplift was carried out in order to constrain their petrogenesis. Zircons from the intrusions display oscillatory zoning and high Th/U ratios (0.13-1.47), implying their rnagmatic origin. Zircon LA-ICP-MS, U-Pb dating results of the Zhuangzili and Mopansban K-feldspar granites indicate that they formed in Paleoproterozoic with the upper intercept ages of 2 104±20 Ma and 2 196±190 Ma, respectively. Taken together, it is suggested that the primary magma for the K-feldspar granites could be mainly derived from partial melting of the Paleoproterzoic and Neoarchean juvenile crust and that a small amount of ancient crustal material was involved in their origin.