Geochronology, geochemistry, zircon Hf isotopic composition and genesis of Shihushan granite in Anning, Yunnan Province
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摘要:
石虎山花岗岩岩体位于安宁市德滋村附近，本文对该岩体开展了LA-ICP-MS锆石U-Pb定年、岩石地球化学、锆石Hf同位素组成研究。结果获得（616±20）Ma的岩浆结晶年龄和（839±17）Ma、（766±15）Ma、（705.5±9.4）Ma的继承性年龄，说明岩体形成于新元古代埃迪卡拉纪；其中（839±17）Ma、（766±15）Ma、（705.5±9.4）Ma的继承性年龄组合可能是Rodinia超大陆裂解构造过程的记录，839 Ma、616 Ma可能是Rodinia超大陆在扬子板块西缘开始裂解与最终裂解时限。花岗岩主量、微量元素特征显示，其产生于伸展环境的高硅、过铝、高钾的A型花岗岩；锆石εHf（t）值均小于0，在t-t（Ma）和t-（176Hf/177Hf）图上，所有样品点均落在上地壳演化线之上，二阶段模式年龄变化范围为1.77~2.31 Ga，结合Nb/Y—Rb/Y图解，表明成岩物质主要来源于古元古代古老下地壳页岩60%部分熔融。
Abstract:The LA-ICP-MS zircon U-Pb age, rock geochemistry and zircon Hf isotopic composition of the Shihushan granite located in Dezi Village of Anning area were investigated in this study. The zircon U-Pb dating yielded a magmatic crystallization age of (616±20) Ma and inherited ages of (839±17) Ma, (766±15) Ma and (705.5±9.4) Ma, indicating pluton emplacement in Neoproterozoic Ediacaran Stage. The authors hold that the magmatic crystallization age of (616±20) Ma indicates the pluton emplacement in Neoproterozoic Ediacaran Stage, and the assemblage of inherited ages of (839±17) Ma, (766±15) Ma and (705.5±9.4) Ma represents the splitting of the Rodinia supercontinent. The age of (839±17) Ma may represent the initiation of the breakup of the Rodinia supercontinent, while the age of (616±20) Ma may represent the final stage of the breakup event. The major and trace elements of alkali feldspar granite show the characteristics of A-type granite with high SiO2-K2O-Al2O3 content, indicating an extensional environment. Zircons from samples have low εHf(t) value (< 0). All samples are plotted on the upper crustal evolution area on t-t (Ma) and t-(176Hf/177Hf) diagrams. The two-stage Hf model ages range from 1.77 Ga to 2.31 Ga. According to the Nb/Y-Rb/Y diagram, the petrogenic material mainly originated from the 60% melting of the shale of the Paleoproterozoic lower crust.
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Key words:
- zircon U-Pb dating /
- A-type granite /
- Rodinia supercontinent /
- geological survey engineering /
- Anning /
- Yunnan
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图 4 石虎山岩体A/CNK-A/NK及SiO2-K2O图解（据Rickwood，1989）
Figure 4.
图 9 石虎山岩体花岗岩类岩石（Zr+Nb+Ce+Y）-(K2O+Na2O)/CaO图解（a，据Whalen et al., 1987）及Nb/Y-Rb/Y图解（b，据Jahn et al., 1999）
Figure 9.
图 10 石虎山岩体花岗岩类岩石Al2O3/TiO2-CaO/Na2O（a）及Rb/Sr-Rb/Ba（b）源区判别图解（据Sylvester，1998）
Figure 10.
图 11 石虎山岩体岩石Yb-Sr（a，据Zhang Qi，2006）及（Y+Rb）-Rb（b，据Pearce，1996）图解
Figure 11.
表 1 石虎山岩体碱长花岗岩的主量元素(%)和微量元素(10-6)分析结果
Table 1. Major (%) and trace element (10-6) compositions of the Shihushan granite
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表 2 碱长花岗岩（D0120）锆石LA-ICP-MS U-Th-Pb同位素分析结果
Table 2. LA-ICP-MS zircon U-Pb age data of alkali-feldspar granite (D0120)
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表 3 碱长花岗岩（D0120）Hf同位素组成
Table 3. Analytical data of zircon Hf isotope composition of alkali-feldspar granite (D0120)
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