Discovery and Geological Significance of Mesoproterozoic Strata in Erdaobaihe Area, Southern Jilin Province
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摘要: 为了查明吉林南部是否存在中元古代地层，并探索该地区的构造演化过程，利用LA-MC-ICP-MS方法对该区碎屑岩样品进行U-Pb同位素定年以及原位Lu-Hf同位素测试.两件碎屑锆石年龄主要集中在太古代（>2.5 Ga），εHf（t）为正值（+1.5~+7.5和+1.4~+4.6），中元古代和古元古代（1.7~2.3 Ga），εHf（t）为（-5.6~+5.7和-5.4~+3.4）.表明其物质来源主要为太古代结晶基底和古元古代晚期辽东-吉南造山带同碰撞的花岗岩，少量可能来源于造山带的火山岩及早期花岗岩.该套地层可能为龙岗、狼林两个微陆块经历俯冲-碰撞形成了胶-辽-吉造山/活动带后的中元古代盖层沉积.Abstract: In order to find out whether Mesoproterozoic strata exist in southern Jilin, and to explore the tectonic evolution of this area. U-Pb isotope dating and in situ Lu-Hf isotope test were performed on the detrital zircon samples in this area by LA-MC-ICP-MS. The age of detrital zircon is mainly concentrated in Archean (> 2.5 Ga), εHf(t) values show positive (+1.5 to +7.5 and +1.4 to +4.6), Mesoproterozoic and Paleoproterozoic (1.7~2.3 Ga), and εHf(t) values appear positive and negative (-5.6 to +5.7 and -5.4 to +3.4). It is indicated that the material source are mainly the granites of the Archean and the Late Paleoproterozoic Liaodong-Jinan orogenic belt, and a small amount may be derived from the volcanic rocks and early granites of the orogenic belt. The set of strata may be the Middle Proterozoic caprock deposits after the subduction-collision of the two micro-continental blocks of Longgang and Langlin formed the Jiao-Liao-Ji orogenic/active belt.
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Key words:
- southern Jilin /
- Erdaobaihe /
- chronology /
- sedimentary strata /
- detrital zircon
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图 1 研究区大地构造单元位置示意图(修改自Luo et al., 2008)
Fig. 1. Schematic map showing geotectonic unit location of the study area(modified from Luo et al., 2008)
图 2 吉林南部研究区地质简图
Fig. 2. Simplified geological map of the study area, southern Jilin, NE China
图 3 二道白河镇大兴屯-四合屯大兴岩组实测地质剖面图(PⅧ)
Fig. 3. Geological profile (PⅧ) of the Erdaobaihe Group in the Daxingtun-Sihetun area
图 4 样品D1502岩石学特征和具有代表性的显微照片(正交偏光)
Ser.绢云母; Qz.石英; Frag.岩屑
Fig. 4. Representative photomicrographs showing the petrography of sample D1502
图 5 样品D1504岩石学特征和具有代表性的显微照片(正交偏光)
Qz.石英; Frag.岩屑
Fig. 5. Representative photomicrographs showing the petrography of sample D1504
图 6 吉林省南部元古代地层中选定的锆石阴极发光图像
黄色和蓝色的圆圈分别代表U-Pb年龄和原位Hf分析位点
Fig. 6. Cathodoluminescence images of selected zircons from Proterozoic strata in southern Jilin Province, NE China
图 7 D1502碎屑锆石样品的年龄协和图与年龄分布频率
Fig. 7. Concordia and probability density plots of detrital zircon ages from the sample D1502
图 8 D1504碎屑锆石样品的年龄协和图与年龄分布频率
Fig. 8. Concordia and probability density plots of detrital zircon ages from the sample D1504
图 9 吉林南部样品的碎屑锆石Hf同位素组成
Fig. 9. Hf isotopic compositions of detrital zircons from samples of southern Jilin
图 10 研究区古元古代构造演化模式
Fig. 10. Model diagram of Paleoproterozoic tectonic evolution in the study area
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