Findings and Its Geological Significance of the Upper Devonian Ophiolite in Hujierte Area, Damao County, Inner Mongolia, China
-
摘要: 在内蒙古胡吉尔特一带进行1∶50 000区域地质调查,发现超基性岩、堆积杂岩、辉绿岩墙群及基性枕状熔岩夹大洋放射虫硅泥质岩组合,呈现典型的蛇绿岩特征,其地球化学资料显示为大洋中脊环境.锆石U-Pb年龄为371.0±5.3 Ma,为晚泥盆世.表明这一地区晚古生代有洋壳存在,是古亚洲洋的一部分,可能为西伯利亚板块与中朝板块之间多岛洋古地理格局中洋盆的一支,并非位于中朝板块内部,推测中朝板块的北缘位于胡吉尔特一带之南.Abstract: Assemblages of the Upper Devonian ultrabasic rock, cumlative complex, diabase-dike swarm as well as basic pillow lava nipping radiolarian Si-sargillaceous rocks are discovered in Hujierte area, Inner Mongolia, China. They are typical ophiolite, which geochemical compositions accord with the characteristics of MORB. The age of 371.0±5.3 Ma using zircon U-Pb geologic dating method shows that there is the Upper Paleozoic era oceanic crust in this area, being a part of the Paleo-Asiatic Ocean, it is possibly a branch of ocean basin in archipelago paleogeographic pattern between the Siberian plate and the Sino-Korean plate, not inner the Sino-Korean plate, a northern part of the Sino-Korean plate should be on the south of Hujierte at the least.
-
Key words:
- ophiolite /
- geosynclinal fold system /
- plate boundary /
- Upper Devonian /
- Hujierte /
- lithology /
- geochemistry
-
图 1 内蒙古及邻区蛇绿岩分布(据唐克东和邵济安,1996修改)
1.第四系松散沉积物;2.上白垩统二连组;3.中二叠统哲斯组;4.上石炭统本巴图组;5.基性枕状熔岩夹含放射虫硅泥质岩组合;6.堆积杂岩及中酸性侵入岩;7.超基性岩(夸大表示)、辉绿岩墙群(夸大表示);8.中新生代沉积盖层;9.中生代陆屑-碳酸盐沉积;10.晚古生代裂谷堆积;11.晚泥盆-早石炭世盖层沉积;12.志留-泥盆纪火山-沉积杂岩;13.晚志留世磨拉石;14.早古生代弧后沉积;15.新元古代和早古生代陆缘沉积;16.太古宙和元古宙结晶基底;17.花岗岩;18.奥陶纪火山弧;19.蛇绿岩;20.蛇绿混杂岩;21.断层;22.韧性剪切带、平移断层、逆断层及其倾角;23.不整合界线、地质界线;24.晚泥盆世蛇绿岩带;25.前人划分的晚泥盆世蛇绿岩带;26.锆石U-Pb法371.0±5.3 Ma年的采样位置
Fig. 1. Distribution map of the ophiolite in Inner Mongolia and its adjacent area
图 3 基性火山熔岩图解
a.K2O-SiO2图解(据Gill,1981);b.硅-碱图解(据Irvine and Baragar, 1971);c.AFM图解(据Irvine and Baragar, 1971);d.FeOt-MgO-Al2O3图解(据Irvine and Baragar, 1971).A.扩张中心;B.岛弧及大陆活动边缘岛屿;C.MORB;D.大洋岛;E.大陆;图例编号与表 1样品序号一致
Fig. 3. The diagrams for basic lava
图 5 堆积杂岩及中酸性侵入岩图解
a.硅-碱图解(据Irvine and Baragar, 1971);b.AFM图解(据Irvine and Baragar, 1971);c.K2O-SiO2图解(据Maniar and Piccoli, 1989);1~5.中细粒斜长花岗岩,6~8.中细粒石英闪长岩,9~11.细粒闪长岩,12~14.细粒角闪辉长岩,15~18.细粒辉长岩;OP.大洋;IAG.岛弧花岗岩类;CAG.大陆弧花岗岩类;CCG.大陆碰撞花岗岩类;RRG.与列谷的花岗岩类;CEUG.陆内造陆运动降起花岗岩类;POG.造山后花岗岩类
Fig. 5. The diagrams for cumulate complexes and intermediate-acidic intrusive rocks
图 6 堆积杂岩及中酸性侵入岩微量元素构造环境判别图解
A.板内;B.火山弧;C.洋中脊(据Pearce and Norry, 1979);1~4.中细粒斜长花岗岩,5~6.中细粒石英闪长岩,7~9.细粒闪长岩,10.细粒角闪辉长岩,11~12.细粒辉长岩
Fig. 6. The trace elements tectonic discrimination diagram for cumulate complexes and intermediate-acidic intrusive rocks
表 1 基性枕状熔岩的主量元素分析结果(%)
Table 1. Major elements (%) analytic data of basic pillow lava
序号 样品号 岩石名称 SiO2 Al2O3 Fe2O3 FeO TiO2 CaO MgO K2O Na2O MnO P2O5 灼减 总量 1 6P1Gs2-1 硅化角砾状玄武岩 55.43 14.94 8.92 2.16 0.55 8.27 2.44 0.18 2.38 0.13 0.08 5.10 100.58 2 6P1Gs2-2 硅化角砾状玄武岩 49.72 16.94 7.87 5.76 0.58 6.94 4.04 0.18 2.18 0.23 0.41 5.68 100.53 3 6P2Gs3-2 蚀变玄武岩 54.99 15.80 6.19 3.90 0.33 8.52 3.89 0.38 3.25 0.13 0.38 1.46 99.22 4 6P2Gs23-2 玄武岩 57.89 15.06 4.74 4.80 0.32 6.66 3.29 0.36 2.99 0.23 0.15 3.71 100.20 5 6P3Gs7 杏仁状玄武岩 50.35 14.91 3.60 7.79 1.40 6.28 6.59 0.32 4.53 0.24 0.13 4.08 100.22 6 6P3Gs12-1 气孔状玄武岩 59.55 14.88 6.17 3.83 0.76 2.91 2.50 0.17 5.78 0.12 0.20 2.84 99.71 7 6Gs0189 蚀变玄武岩 53.65 13.05 6.51 5.95 2.50 5.16 4.45 0.39 4.78 0.21 0.29 3.17 100.11 8 6Gs1037 杏仁状玄武岩 61.49 14.03 4.60 3.34 1.05 3.10 2.82 0.29 6.21 0.11 0.73 2.30 100.07 9 6Gs4022-4 蚀变角斑岩 59.28 16.87 2.25 5.86 0.81 5.17 2.19 0.39 4.84 0.11 0.07 1.50 99.34 10 6P7Gs31-1 球粒石英角斑岩 70.21 13.16 2.82 2.38 0.27 2.80 0.96 0.08 5.43 0.04 0.05 1.11 99.31 注:内蒙古自治区地质矿产实验研究所完成;采用经典法分析. -
Bao, Z.W., Chen, S.H., Zhang, Z.T., 1994. Study on REE and Sm-Nd isotopes of Hegenshan ophiolite, Inner Mongolia. Geochimica, 23(4): 339-349 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQHX404.003.htm Bureau of Geology and Mineral Resources, The Inner Mongolia Autonomous Region, 1991. Regional geology of Inner Mongolia Autonomous Region. Geological Publishing House, Beijing, 17-36, 45-37 (in Chinese). Bureau of Geology and Mineral Resources, The Inner Mongolia Autonomous Region, 1996. Rock strata of Inner Mongolia autonomous region. China University of Geosciences Press, Wuhan, 198-205 (in Chinese). Cao, C.Z., Yang, F.L., Tian, C.L., et al., 1986. The ophiolite in Hegenshan district, Nei Mongol and the position of Suture line between Sino-Korean and Siberian Plate. In: The editional of board of plage tectonics in northern China memoire, ed., Committee proceedings of the Plate Tectonics in northern China (1). Geological Publishing House, Beijing, 64-86 (in Chinese). Chen, L., Sun, Y., Pei, X.Z., et al., 2003. Comprehensive comparison of ophiolite and dynamic significance: for example Deerni ophiolite. Science in China (Ser. D), 33(12) : 1136-1142 (in Chinese). Engel, A.E.J., Engel, C.G., Havens, R.G., 1965. Chemical characteristics of oceanic basalts and the upper mantle. GSA Bulletin, 76(7): 719-734. doi: 10.1130/0016-7606(1965)[719:CCOOBA]2.0.CO;2 Gao, J.Y., Wang, Y.X., Qiou, Y.Z., et al., 2001. Islands-ocean structural evolution of mid-western continent in Inner Mongulia. Geotectonica et Metallogenia, 25(4): 397-404 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DGYK200104005.htm Gill, J.B., 1981. Orogenic andisites and plate tectonics. Springer, Berlin. Han, G.Q., Liu, Y.J., Wen, Q.B., et al, 2011. LA-ICPMS U-Pb dating of Detrital Zircons from the Permian sandstones in north side of Xar Moron River suture belt and its tectonic implications. Earth Science—Journal of China University of Geosciences, 36(4): 667-702 (in Chinese with English abstract). http://www.researchgate.net/publication/285804831_LA-ICP-MS_U-Pb_dating_of_detrital_zircons_from_the_Permian_sandstones_in_north_side_of_Xar_Moron_River_suture_belt_and_its_tectonic_implications/download He, G.Q., Li, M.S., 1996. Study on Paleozoic ophiolites and their tectonic significances in Hinggan-Mongolian-North Xinjiang and adjacent area. In: Zhang, Q., ed., Ophiolite and geodynamics symposium. Geological Publishing House, Beijing, 104-107 (in Chinese). Irvine, I.N., Baragar, W.R.A., 1971. A guide to the chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences, 8(5): 532-548. doi: 10.1139/e71-055 Lan, C.L., Li, J.L., He, S.L., 2007. Ocean-continent subduction within the Paleotethyan archiopeligic ocean from Muztag ophiolite. Earth Science—Journal of China University of Geosciences, 33(3): 331-328 (in Chinese with English abstract). http://qikan.cqvip.com/Qikan/Article/Detail?id=20986938 Liang, R.X., 1994. The features of ophiolites in the central sector of Inner Mongolia and its geological significance. Regional Geology of China, 1: 37-45 (in Chinese with English abstract). http://www.researchgate.net/publication/281539249_The_features_of_ophiolites_in_the_central_sector_of_Inner_Mongolia_and_its_geological_significance Maniar, P.D., Piccoli, P.M., 1989. Tectonic discrimination of granitoids. Bull. Geol. Soc. Am., 101(5): 635-643. doi: 10.1130/0016-7606(1989)101<0635:TDOG>2.3.CO:2 Pearce, J.A., Harris, N.B.W., Tindl, A.G., 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. J. Petrol., 25(4): 956-983. doi: 10.1093/petrology/25.4.956 Perace, J.A., Norry, M.J., 1979. Petrogenetic implication of Ti, Zr, Y and Nb variations in volcanic rocks. Contrib. Mineral. Petrol, 25: 956-983. doi: 10.1007/BF00375192 Pearce, T.H., Gorman, B.E., Birkett, T.C., 1977. The relationship between major element chemistry and tectonic environment of basic and intermediate volcanic rocks. Earth and Planetary Sciences Letters, 36(1): 121-132. doi: 10.1016/0012-821X(77)90193-5 Robinson, P.T., Bai, W.J., Yang, J.S., et al., 1995. Geochemical constraints on petrogenesis and crustal accretion of the Hegenshan ophiolite, northern China. Acta Petrologica Sinica, 11(Suppl. ): 112-124 (in Chinese with English abstract). http://www.researchgate.net/publication/284594341_Geochemical_constraints_on_petrogenesis_and_crustal_accretion_of_the_Hegenshan_ophiolite_Northern_China Sun, D.Y., Wu, F.Y., Li, H.M., et al., 2000. Relations of era a-granite from Little Xingan ridge in the northwestern and the eastern collision folded belt in Suolunshan-Hegenshan-Zhalaite. Chinese Science Bulletin, 45(20): 2217-2222(in Chinese with English abstract). doi: 10.1360/csb2000-45-20-2217 Tang, K.D., Shao, J.A., 1996. Some characteristics of the ophiolite from the ancient Asian Ocean and its evolutions. In: Zhang, Q., ed., Ophiolite and geodynamics symposium. Geological Publishing House, Beijing, 108-111 (in Chinese). Wang, Y.J., Fan, Z.Y., 1997. Discovery of Permian radiolarians in ophiolite belt on northern side of Xar Moron River, Nei Monggol and its geological significance. Acta Palaeontologica Sinica, 36(1): 58-69 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-GSWX701.004.htm Xu. B., Charvet, J., Zhang, F.Q., 2001. Primary study on petrology and geochrononology of blueschists in Sunitezuoqi, northern Inner Mongolia. Chinese Journal of Geology, 36(4): 424-434 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DZKX200104005.htm Zhang, C., Wu, T.R., 1999. Features and tectonic implications of the ophiolitic melange in the southern Suzuoqi, Inner Mongolia. Scientia Geologica Sinica, 34(3): 381-389 (in Chinese with English abstract). http://www.researchgate.net/publication/293272400_Features_and_tectonic_implications_of_the_ophiolitic_melange_in_the_southern_Suzuoqi_Inner_Mongolia Zhang, H.Y., liu, J.L., 2011. Plate tectonics and mineralization of the Tethyan ophiolite in the southern Sanjiang and Indo-China peninsular area. Earth Science—Journal of China University of Geosciences, 36(2): 331-328. doi: 10.3799/dgkx.2011.027 Zhang, Q., Zhou, G.Q., 2001. Ophiolites of China. Science Press, Beijing, 1-15, 43-48 (in Chinese). 包志伟, 陈森煌, 张桢堂, 1994. 内蒙古贺根山地区蛇绿岩稀土元素和Sm-Nd同位素研究. 地球化学, 23(4): 339-349. doi: 10.3321/j.issn:0379-1726.1994.04.004 曹从周, 杨芳林, 田昌烈, 等, 1986. 内蒙古贺根山地区蛇绿岩及中朝板块和西伯利亚板块之间的缝合带位置. 见: 中国北方板块构造论文集编委会编, 中国北方板块构造论文集(1). 北京: 地质出版社, 64-86. 陈亮, 孙勇, 裴先治, 等, 2003. 古特提斯蛇绿岩的综合对比及其动力学意义——以德尔尼蛇绿岩为例. 中国科学(D辑), 33(12): 1136-1142. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK200312001.htm 高计元, 王一先, 裘愉卓, 等, 2001. 内蒙古中西部多岛海构造演化. 大地构造与成矿学, 25(4): 397-404. doi: 10.3969/j.issn.1001-1552.2001.04.006 韩国卿, 刘永江, 温泉波, 等, 2011. 西拉木伦河缝合带北侧二叠纪砂岩碎屑锆石LA-ICP-MS U-Pb年代学及其构造意义. 地球科学——中国地质大学学报, 36(4): 687-702. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX201104008.htm 何国琦, 李茂松, 1996. 兴蒙-北疆及邻区古生代蛇绿岩的对比研究及其大地构造意义. 见: 张旗, 编, 蛇绿岩与地球动力学研讨会论文集. 北京: 地质出版社, 104-107. 兰朝利, 李继亮, 何顺利, 2007. 古特提斯多岛洋洋-陆俯冲: 木孜塔格蛇绿岩的矿物学证据. 地球科学——中国地质大学学报, 32(3): 331-328. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200703003.htm 梁日暄, 1994. 内蒙古中段蛇绿岩特征及地质意义. 中国区域地质, 1: 37-45. https://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD401.005.htm 内蒙古自治区地质矿产局, 1991. 内蒙古自治区区域地质志. 北京: 地质出版社, 17-36, 45-57. 内蒙古自治区地质矿产局, 1996. 内蒙古自治区岩石地层. 武汉: 中国地质大学出版社, 198-205. Robinson, P.T., 白文吉, 杨经绥, 等, 1995. 内蒙古贺根山蛇绿岩岩石成因和地壳增生的地球化学制约. 岩石学报, 11(增刊): 112-124. https://www.cnki.com.cn/Article/CJFDTOTAL-YSXB5S1.008.htm 孙德有, 吴福元, 李惠民, 等, 2000. 小兴安岭西北部造山后A型花岗岩的时代与索伦山-贺根山-扎赉特碰撞拼合带东延的关系. 科学通报, 45(20): 2217-2222. doi: 10.3321/j.issn:0023-074X.2000.20.019 唐克东, 邵济安, 1996. 古亚洲洋区蛇绿岩的某些特征与古洋演化. 见: 张旗编, 蛇绿岩与地球动力学研讨会论文集. 北京: 地质出版社, 108-111. 王玉净, 樊志勇, 1997. 内蒙古西拉木伦河北部蛇绿岩带中二叠纪放射虫的发现及其地质意义. 古生物学报, 36(1): 58-69. https://www.cnki.com.cn/Article/CJFDTOTAL-GSWX701.004.htm 徐备, Charvet, J., 张福勤, 2001. 内蒙古北部苏尼特左旗蓝片岩岩石学和年代学研究. 地质科学, 36(4): 424-434. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKX200104005.htm 张臣, 吴泰然, 1999. 内蒙古苏左旗南部早古生代蛇绿混杂岩特征及其构造意义. 地质科学, 34(3): 381-389. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKX199903013.htm 张宏远, 刘俊来, 2011. 三江南段-中南半岛特提斯蛇绿岩大地构造与成矿. 地球科学——中国地质大学学报, 36(2): 331-328. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX201102012.htm 张旗, 周国庆, 2001. 中国蛇绿岩. 北京: 科学出版社, 1-15, 43-48.