| Citation: |
WAN Yusheng, SONG Zhiyong, WANG Laiming, XIE Hangqiang, LIU Shoujie, HOU Jianhua, DONG Chunyan, XIE Shiwen, BAI Wenqian, LIU Dunyi. Early Precambrian evolution of the Qixia area, eastern North China Craton:Evidence from geological mapping and SHRIMP U-Pb zircon dating[J]. Geological Bulletin of China, 2017, 36(11): 1927-1941.
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Early Precambrian evolution of the Qixia area, eastern North China Craton:Evidence from geological mapping and SHRIMP U-Pb zircon dating
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Abstract
Qixia is a typical area of Early Precambrian basement in eastern Shandong, North China Craton. Many TTG rocks were once considered to be supracrustal rocks (the Jiaodong Group), and the formation ages of the rocks have only been determined in a few outcrops in the original geological map (1:50000) of the area. In this study, the authors carried out geological mapping and SHRIMP U-Pb zircon dating on more than 30 samples in order to determine the temporal and spatial distribution of the TTG rocks. In the newly compiled geological map (1:50000), the main rock types of the Archean basement are tonalite gneisses with ages~2.9Ga, ~2.7Ga and~2.5Ga and some local trondhjemite gneisses of the same ages. Supracrustal rocks of~2.9Ga and~2.5Ga (the Huangyadi supracrustal rocks and the Jiaodong Group) are very rare. All of the rocks roughly extend in a NWW-SEE direction, probably as a result of the strong late Neoarchean and late Paleoproterozoic tectonothermal events.
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Keywords:
- eastern Shandong /
- TTG /
- Archean /
- geological mapping /
- SHRIMP zircon U-Pb dating
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References
[1] Xie S W, Xie H Q, Wang S J, et al. Ca. 2.9Ga granitoid magmatism in eastern Shandong, North China Craton:Zircon dating, Hf-inzircon isotopic analysis and whole-rock geochemistry. Precambrian Research, 2014, 255:538-562. doi: 10.1016/j.precamres.2014.09.006 [2] Liu S J, Jahn B M, Wan Y S, et al. Neoarchean to Paleoproterozoic high-pressure mafic granulite from the Jiaodong Terrain, North China Craton:Petrology, zircon age determination and geological implications. Gondwana Research, 2015, 28:493-508. doi: 10.1016/j.gr.2014.07.006 [3] Jahn B M, Liu D Y, Wan Y S, et al. Archean crustal evolution of the Jiaodong Peninsula, China, as revealed by zircon SHRIMP geochronology, elemental and Nd-isotope geochemistry[J]. Am. J. Sci., 2008, 308:232-269. doi: 10.2475/03.2008.03 [4] 刘建辉, 刘福来, 刘平华, 等, 胶北早前寒武纪变质基底多期岩浆-变质热事件:来自TTG片麻岩和花岗质片麻岩中锆石U-Pb定年的证据[J].岩石学报, 2011, 27:943-960. [5] Wang W, Zhai M G, Li T S, et al. Archean-Paleoproterozoic crustal evolution in the eastern North China Craton:zircon U-Th-Pb and Lu-Hf evidence from the Jiaobei terrane[J]. Precambrian Research, 2014, 241:146-160. doi: 10.1016/j.precamres.2013.11.011 [6] Wu M L, Zhao G C, Sun M, et al. Zircon U-Pb geochronology and Hf isotopes of major lithologies from theJiaodong Terrane:implications for the crustal evolution of the Eastern Block ofthe North China Craton[J]. Lithos, 2014, 190/191:71-84. doi: 10.1016/j.lithos.2013.12.004 ① 王来明. 1: 50000栖霞县幅地质图及说明书. 山东省地质矿产局出版. 1989. -
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WAN Yusheng, SONG Zhiyong, WANG Laiming, XIE Hangqiang, LIU Shoujie, HOU Jianhua, DONG Chunyan, XIE Shiwen, BAI Wenqian, LIU Dunyi. Early Precambrian evolution of the Qixia area, eastern North China Craton:Evidence from geological mapping and SHRIMP U-Pb zircon dating[J]. Geological Bulletin of China, 2017, 36(11): 1927-1941.
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Figure 1.
Geological map of eastern Shandong
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Figure 2.
Original geological map (1:50000) of the Qixia area
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Figure 3.
Field photographs of Archean tonalite gneisses in the Qixia area, which were considered to be tonalite gneisses in early mapping
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Figure 4.
Field photographs of Archean tonalite gneisses in the Qixia area, which were regarded as the supracrustal rocks of the Yingzhuangkuan Formation of the Jiaodong Group in early mapping
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Figure 5.
Field photographs of Archean tonalite gneisses in the Qixia area, which were regarded as the supracrustal rocks of the Qishan Formation of the Jiaodong Group in early mapping
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Figure 6.
Archean trondhjemite gneisses in the Qixia area
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Figure 7.
Field photographs of Archean tonalite gneisses in the Qixia area, which were considered to be migmatite and mylonitized migmatite in early mapping
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Figure 8.
2.9Ga tonalite gneisses in the Qixia area
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Figure 9.
2.9Ga TTG in Zhoujiagou, Qixia
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Figure 图版Ⅰ.
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Figure 图版Ⅱ.
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Figure 10.
Cathodoluminescence images and U-Pb concordia diagrams of zircons from Archean magmatic rocks in the Qixia area
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Figure 11.
Revised geological map (1:50000) of the Qixia area