Anatomy of a Neoarchean Geological Section in the Lihang Area, Western Shandong: Field Observation and SHRIMP U-Pb Zircon Dating
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摘要: 以往对鲁西新太古代地质研究主要是区域性的，对于露头尺度上的深入研究还不多见.本文对鲁西泰山栗杭地区的地质剖面进行了详细的野外地质和锆石SHRIMP年代学研究.岩石十分新鲜，类型多种多样，现象丰富且复杂.条带状英云闪长质片麻岩和细粒英云闪长质片麻岩的岩浆锆石年龄分别为2.62 Ga和2.63 Ga，可解释为岩石的形成时代.另一条带状英云闪长质片麻岩的岩浆锆石和变质锆石年龄相近，均为~2.57 Ga，其地质意义需进一步工作来确定.奥长花岗质岩脉的形成时代为2.60 Ga.闪长质片麻岩侵入条带状英云闪长质片麻岩和奥长花岗质岩脉，岩浆锆石年龄为2.52 Ga，存在2.66~2.69 Ga外来锆石.研究表明，泰山地区存在不同时代（~2.7 Ga和~2.6 Ga）英云闪长质片麻岩，仅根据野外特征难以相互区别.该剖面所记录的岩浆构造热事件是鲁西地区新太古代地质演化的缩影，但缺失~2.7 Ga TTG岩石记录.Abstract: Previous studies on the Neoarchean geology in western Shandong were mainly regional with few reports on the outcrop scale. Detailed field observation and SHRIMP U-Pb zircon dating are carried out in this study on rocks in a road cutting section in the Lihang area, western Shandong, where different types of rocks are very fresh and show complex and various relationships. Banded tonalitic gneiss and fine-grained tonalitic gneiss have magmatic zircon ages of 2.62 Ga and 2.63 Ga, respectively, which are considered to be the crystallization times of the rocks. Another banded tonalitic gneiss has similar magmatic and metamorphic zircon ages of ~2.57 Ga. More work is required to determine its geological meaning. A trondhjemitic dyke has a formation age of 2.60 Ga. A diorite dyke intruding banded tonalitic gneiss and trondhjemitic vein has magmatic and metamorphic zircon ages of 2.52 Ga and 2.51 Ga, respectively, with 2.66-2.69 Ga xenocrystic zircons. Combined with previous work, it is concluded that there are tonalitic gneisses of different ages (~2.7 Ga and ~2.6 Ga) in the Taishan area, which are difficult to be distinguished from each other in field. The geological records in this section may be an epitome of Neoarchean geological history of western Shandong but without ~2.7 Ga TTG record.
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Key words:
- Neoarchean /
- magmatism /
- Taishan /
- western Shandong /
- SHRIMP zircon dating /
- petrology
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图 1 鲁西泰山地区地质简图（据庄育勋等，1995；山东省地质矿产局区域地质调查队，1991修改）
Fig. 1. Geological map of the Taishan area, western Shandong (modified after Zhuang et al., 1995; regional geological survey team of Shandong geological bureau, 1991)
图 2 鲁西栗杭地区新太古代岩石信手剖面
Fig. 2. Geological section of Neoarchean rocks in the Lihang area, western Shandong
图 3 鲁西栗杭地区新太古代岩石的野外照片
a.条带状英云闪长质片麻岩，被闪长质片麻岩侵入；b.条带状英云闪长质片麻岩中的“岩脉”，“岩脉”中的片麻理与“岩脉”平行，切割围岩片麻理；c.条带状英云闪长质片麻岩中相对均匀的部分（LX1504），也显示深熔特征；d.条带状英云闪长质片麻岩（“岩脉”，S14103）；e和f.条带状英云闪长质片麻岩中局部存在变形不强的深熔块体，切割奥长花岗质浅色体条带；g.闪长质片麻岩切割包裹（条带状）英云闪长质片麻岩；h.闪长质片麻岩（S1410）切割英云闪长质片麻岩及其中的奥长花岗质脉体；i.闪长质片麻状中存在奥长花岗岩脉；a~i的位置位于剖面北东段.j和k.条带状英云闪长质片麻岩；l.条带状英云闪长质片麻岩中的奥长花岗质岩脉（S14102）；j~l位于图a北东侧不远位置.m.二长花岗岩脉切割早期岩石，右侧（西南侧）为条带状斜长角闪岩，左侧（东北侧）主体为细粒英云闪长质片麻岩；n.二长花岗岩脉切割条带状斜长角闪岩；o.奥长花岗岩脉弥散状贯入细粒英云闪长质片麻岩；p.细粒英云闪长质片麻岩包裹切割条带状英云闪长质片麻岩；q.细粒英云闪长质片麻岩（LX1503）；m~q的位置位于剖面西南段
Fig. 3. Field photographs of Neoarchean rocks in the Lihang area, western Shandong
图 4 鲁西栗杭地区新太古代岩石的显微照片
a和b.条带状英云闪长质片麻岩（LX1504）；c.条带状英云闪长质片麻岩（“岩脉”，S14103）；d和e.闪长质片麻岩（S1410）；f.奥长花岗岩脉（S14102）；g和h.细粒英云闪长质片麻岩（LX1503）.Qtz.石英；Pl.斜长石；Fels.长石；Am.角闪石；Bt.黑云母
Fig. 4. Photographs showing petrographic features of Neoarchean rocks in the Lihang area, western Shandong
图 5 鲁西栗杭地区新太古代岩石的锆石阴极发光图像
a.条带状英云闪长质片麻岩（LX1504）；b.条带状英云闪长质片麻岩（“岩脉”，S14103）；c.闪长质片麻岩（S1410）；d.奥长花岗岩脉（S14102）；e.细粒英云闪长质片麻岩（LX1503）.括号中数字分别代表207Pb/206Pb年龄和Th/U比值
Fig. 5. Cathodoluminescence (CL) images of zircons from Neoarchean rocks in the Lihang area, western Shandong
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[1] Black, L. P., Kamo, S. L., Allen, C. M., et al., 2004. Improved 206Pb/238U Microprobe Geochronology by the Monitoring of a Trace-Element-Related Matrix Effect; SHRIMP, ID-TIMS, ELA-ICP-MS and Oxygen Isotope Documentation for a Series of Zircon Standards. Chemical Geology, 205(1-2):115-140. https://doi.org/10.1016/j.chemgeo.2004.01.003 [2] Cao, G. Q., 1996. Early Precambrian Geology of Western Shandong. Geological Publishing House, Beijing (in Chinese). [3] Cheng, Y. Q., Shen, Q. H., Wang, Z. J., 1982. Preliminary Study of the Metamorphosed Basic Volcano-Sedimentary Yanlingguan Formation of the Taishan Group of Xintai, Shandong. Geological Publishing House, Beijing (in Chinese). [4] Dong, C. Y., Xie, H. Q., Kröner, A., et al., 2017. The Complexities of Zircon Crystllazition and Overprinting during Metamorphism and Anatexis:an Example from the Late Archean TTG Terrane of Western Shandong Province, China. Precambrian Research, 300:181-200. https://doi.org/10.1016/j.precamres.2017.07.034 [5] Du, L. L., Zhuang, Y. X., Yang, C. H., et al., 2003. Characters of Zircons in the Mengjiatun Formation in Xintai of Shandong and Their Chronological Significance. Acta Geologica Sinica, 77(3):359-366 (in English with Chinese abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dizhixb200303007 [6] Du, L. L., Zhuang, Y. X., Yang, C. H., et al., 2005. SHRIMP U-Pb Zircon Chronology of Fine-Grained Amphibolite in the Mengjiatun Area, Western Shandong. Acta Geoscientica Sinica, 26(5):429-434 (in English with Chinese abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dqxb200505006 [7] Gao, L., Liu, S. W., Hu, Y. L., et al., 2020. Late Neoarchean Geodynamic Evolution:Evidence from the Metavolcanic Rocks of the Western Shandong Terrane, North China Craton. Gondwana Research, 80:303-320. https://doi.org/10.1016/j.gr.2019.10.017 [8] Gao, L., Liu, S. W., Sun, G. Z., et al., 2018. Petrogenesis of Late Neoarchean High-K Granitoids in the Western Shandong Terrane, North China Craton, and Their Implications for Crust-Mantle Interactions. Precambrian Research, 315:138-161. https://doi.org/10.1016/j.precamres.2018.07.006 [9] Hu, Y. L., Liu, S. W., Gao, L., et al., 2019. Diverse Middle Neoarchean Granitoids and the Delamination of Thickened Crust in the Western Shandong Terrane, North China Craton. Lithos, 348-349:105178. https://doi.org/10.1016/j.lithos.2019.105178 [10] Jahn, B. M., Auvray, B., Shen, Q. H., et al., 1988. Archean Crustal Evolution in China:The Taishan Complex, and Evidence for Juvenile Crustal Addition from Long-Term Depleted Mantle. Precambrian Research, 38(4):381-403. https://doi.org/10.1016/0301-9268(88)90035-6 [11] Lu, S. N., Chen, Z. Q., Xiang, Z. Q., 2008. Chronological Framework of Ancient Intrusive Rock Series in Taishan World Geopark. Geological Publishing House, Beijing (in Chinese). [12] Ludwig, K. R., 2001. SQUID 1.02, A User's Manual. Berkeley Geochronology Center, Berkeley. [13] Ludwig, K. R., 2003. Isoplot 3.00: A Geochronological Toolkit for Microsoft Excel. Berkeley Geochronology Centre, Berkeley. [14] Nasdala, L., Hofmeister, W., Norberg, N., et al., 2008. Zircon M257:A Homogeneous Natural Reference Material for the Ion Microprobe U-Pb Analysis of Zircon. Geostandards and Geoanalytical Research, 32(3):247-265. https://doi.org/10.1111/j.1751-908x.2008.00914.x [15] Peng, T. P., Wilde, S. A., Fan, W. M., et al., 2013. Late Neoarchean Potassic High Ba-Sr Granites in the Taishan Granite-Greenstone Terrane:Petrogenesis and Implications for Continental Crustal Evolution. Chemical Geology, 344:23-41. https://doi.org/10.1016/j.chemgeo.2013.02.012 [16] Polat, A., Li, J., Fryer, B., et al., 2006. Geochemical Characteristics of the Neoarchean (2 800-2 700 Ma) Taishan Greenstone Belt, North China Craton:Evidence for Plume-Craton Interaction. Chemical Geology, 230(1-2):60-87. https://doi.org/10.1016/j.chemgeo.2005.11.012 [17] Regional Geological Survey Team of Shandong Geological Bureau (RGSTSGB), 1991.1: 200 000 Regional Map of the Geological Survey for the Taian. Regional Geological Survey Team of Shandong Geological Bureau, Jinan (in Chinese). [18] Ren, P., Xie, H. Q., Wang, S. J., et al., 2015.2.5-2.7 Ga Tectono-Thermal Events in Western Shandong:Geology and Zircon SHRIMP Dating of TTG Rocks in Huangqian Reservoir, Taishan Mountain. Geological Review, 61(5):1068-1078 (in Chinese with English abstract). http://search.cnki.net/down/default.aspx?filename=DZLP201505010&dbcode=CJFD&year=2015&dflag=pdfdown [19] Ren, P., Xie, H. Q., Wang, S. J., et al., 2016. A Ca. 2.60 Ga Tectono-Thermal Event in Western Shandong Province, North China Craton from Zircon U-Pb-O Isotopic Evidence:Plume or Convergent Plate Boundary Process. Precambrian Research, 281:236-252. https://doi.org/10.1016/j.precamres.2016.05.016 [20] Ren, P., Xie, H. Q., Wang, S. J., et al., 2017.~2.6 Ga Anatexis in Western Shandong:Geology and Geochemistry of Leucosomes in the Taishan Area. Chinese Journal of Geology, 52(4):1097-1119 (in Chinese with English abstract). http://www.researchgate.net/publication/322137039_26_Ga_anatexis_in_western_Shandong_Geology_and_geochemistry_of_leucosomes_in_the_Taishan_area [21] Wan, Y. S., Dong, C. Y., Wang, S. J., et al., 2014. Middle Neoarchean Magmatism in Western Shandong, North China Craton:SHRIMP Zircon Dating and LA-ICP-MS Hf Isotope Analysis. Precambrian Research, 255:865-884. https://doi.org/10.1016/j.precamres.2014.07.016 [22] Wan, Y. S., Liu, D. Y., Wang, S. J., et al., 2010. Juvenile Magmatism and Crustal Recycling at the End of the Neoarchean in Western Shandong Province, North China Craton:Evidence from SHRIMP Zircon Dating. American Journal of Science, 310(10):1503-1552. https://doi.org/10.2475/10.2010.11 [23] Wan, Y. S., Liu, D. Y., Wang, S. J., et al., 2011. ∼2.7Ga Juvenile Crust Formation in the North China Craton (Taishan-Xintai Area, Western Shandong Province):Further Evidence of an Understated Event from U-Pb Dating and Hf Isotopic Composition of Zircon. Precambrian Research, 186(1-4):169-180. https://doi.org/10.1016/j.precamres.2011.01.015 [24] Wan, Y. S., Wang, S. J., Liu, D. Y., et al., 2012. Redefinition of Depositional Ages of Neoarchean Supracrustal Rocks in Western Shandong Province, China:SHRIMP U-Pb Zircon Dating. Gondwana Research, 21(4):768-784. https://doi.org/10.1016/j.gr.2011.05.017 [25] Wan, Y. S., Wang, S. J., Ren, P., et al., 2015. Neoarchean Magmatism in the Culaishan Area, Western Shandong:Evidence from SHRIMP Zircon U-Pb Dating. Acta Geoscientica Sinica, 36(5):634-646 (in Chinese with English abstract). http://www.researchgate.net/publication/284737295_Neoarchean_magmatism_in_the_culaishan_area_western_Shandong_evidence_from_SHRIMP_zircon_U-Pb_dating [26] Wang, S. J., Wan, Y. S., Yang, E. X., et al., 2012. Middle Neoarchean Magmatism in Western Shandong Province——Evidence of Zircons SHRIMP U-Pb Dating in Xinfushan and Shanggang Plutons. Shandong Land Resource, 28(4):1-7 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-SDDI201204001.htm [27] Wang, Y. J., Zhang, Y. Z., Zhao, G. C., et al., 2009. Zircon U-Pb Geochronological and Geochemical Constraints on the Petrogenesis of the Taishan Sanukitoids (Shandong):Implications for Neoarchean Subduction in the Eastern Block, North China Craton. Precambrian Research, 174(3-4):273-286. https://doi.org/10.1016/j.precamres.2009.08.005 [28] Williams, I. S., 1998.U-Th-Pb Geochronology by Ion Microprobe.In: Mickibben, M.A., Shanks Ⅲ, W. C., Ridley, W. I., eds., Applications of Microanalytical Techniques to Understanding Mineralizing Processes. Review Econonic Geology, 7: 1-35.https://doi.org/10.1080/00241160410006483 [29] Zhuang, Y. X., Wang, X. S., Xu, H. L., et al., 1997. Main Geological Events and Crustal Evolution in Early Precambrian of Taishan Region. Acta Petrologica Sinica, 13(3):313-330 (in Chinese with English abstract). http://www.cqvip.com/Main/Detail.aspx?id=2636092 [30] Zhuang, Y. X., Xu, H. L., Wang, X. S., et al., 1995. New Advances in the Study of Neoproterozoic-Paleoproterozoic Crustal Evolution in the Taishan Area. Regional Geology of China, (4):360-366 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-ZQYD504.012.htm [31] 曹国权, 1996.鲁西早前寒武纪地质.北京:地质出版社. [32] 程裕淇, 沈其韩, 王泽九, 1982.山东太古代雁翎关变质火山-沉积岩.北京:地质出版社. [33] 杜利林, 庄育勋, 杨崇辉, 等, 2003.山东新泰孟家屯岩组锆石特征及其年代学意义.地质学报, 77(3):359-366. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dizhixb200303007 [34] 杜利林, 庄育勋, 杨崇辉, 等, 2005.鲁西孟家屯一种细粒斜长角闪岩的锆石SHRIMP年代学.地球学报, 26(5):429-434. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dqxb200505006 [35] 陆松年, 陈志宏, 相振群, 2008.泰山世界地质公园古老侵入岩系年代格架.北京:地质出版社. [36] 山东省地质矿产局区域地质调查队, 1991.1: 20万泰安幅区域地质图.济南: 山东省地质矿产局地质调查队. [37] 任鹏, 颉颃强, 王世进, 等, 2015.鲁西2.5~2.7 Ga构造岩浆热事件:泰山黄前水库TTG侵入岩的野外地质和锆石SHRIMP定年.地质论评, 61(5):1068-1078. http://www.cnki.com.cn/Article/CJFDTotal-DZLP201505010.htm [38] 任鹏, 颉颃强, 王世进, 等, 2017.鲁西~2.6 Ga深熔作用:泰山地区浅色体的野外地质和地球化学研究.地质科学, 52(4):1097-1119. http://www.cqvip.com/QK/94066X/20174/673346575.html [39] 万渝生, 王世进, 任鹏, 等, 2015.鲁西徂徕山地区新太古代岩浆作用:锆石SHRIMP U-Pb定年证据.地球学报, 36(5):634-646. http://cpfd.cnki.com.cn/Article/CPFDTOTAL-DQXB201509001011.htm [40] 王世进, 万渝生, 杨恩秀, 等, 2012.鲁西地区新太古代中期岩浆活动——新甫山与上港等岩体锆石SHRIMP U-Pb定年的证据.山东国土资源, 28(4):1-7. http://www.cnki.com.cn/Article/CJFDTotal-SDDI201204001.htm [41] 庄育勋, 王新社, 徐洪林, 等, 1997.泰山地区早前寒武纪主要地质事件与陆壳演化.岩石学报, 13(3):313-330. http://www.cqvip.com/Main/Detail.aspx?id=2636092 [42] 庄育勋, 徐洪林, 王新社, 等, 1995.鲁西泰山地区早前寒武纪地壳演化研究的新进展.中国区域地质, (4):360-366. -
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