| Citation: | Shiping HE, Hongliang WANG, Juanlu CHEN, Xueyi XU, Hongfei ZHANG, Guangming REN, Jiyuan YU. LA-ICP-MS U-Pb Zircon Geochronology of Basic Dikes within Maxianshan Rock Group in the Central Qilian Orogenic Belt and Its Tectonic Implications. Journal of Earth Science, 2007, 18(1): 19-29.
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A large number of basic dikes, which indicate an important tectonic-magmatic event in the eastern part of the Central Qilian (祁连) orogenic belt, were found from Maxianshan (马衔山) rock group, Yongjing (永靖) county, Gansu (甘肃) Province, China. According to the research on the characteristics of geology and petrology, the basic dike swarms, widely intruded in Maxianshan rock group, are divided into two phases by the authors. U-Pb isotope of zircons from the basic dikes above two phases is separately determined by LA-ICP-MS in the Key Laboratory of Continental Dynamics of Northwest University, China and the causes of formation of the zircons are studied using CL images. The formation age of the earlier phase of metagabbro dikes is (441.1±1.4) Ma (corresponding to the early stage of Early Silurian), and the age of the main metamorphic period is (414.3±1.2) Ma (corresponding to the early stage of Early Devonian). The formation age of the later phase of diabase dike swarms is (434±1.0) Ma (corresponding to the late stage of Early Silurian). The cap- tured-zircons from diabase dike swarms saved some information of material interfusion by Maxianshan rock group (207pb/206pb apparent ages are (2 325±3)-(2 573 ±6) Ma), and some zircons from diabase dike swarms also saved impacted information by tectonic thermal event during the late period of Caledonian movement (206pb/238U apparent ages are (400±2)-(429±2) Ma). By combining the results of the related studies, the basic dikes within Maxianshan rock group were considered to be formed in the transfer period, from subductional orogeny towards collisional orogeny, which represents geological records of NW-SE extension during regional NE-SW towards intense compression in the Central Qilian block.
| Andersen, T., 2002. Correction of Common Lead in U-Pb Analyses that do not Report 204Pb. Chemical Geology, 192: 59-79 doi: 10.1016/S0009-2541(02)00195-X |
| Feng, Y. M., He, S. P., 1996a. Orogenic Process of the Qilian Mountains. Acta Geoscientia Sinica, Special Issue: 1-5 |
| Feng, Y. M., He, S. P., 1996b. Geotectonics and Orogeny of the Qilian Mountains, China. Geolgical Publishing House, Beijing. 1-135 (in Chinese with English Abstract) |
| Feng, Y. M., 1997. Investigatory Summary of the Qilian Oro-genic Belt, China: History, Presence and Prospect. Advance in Earth Sciences, 12(4): 308-314 (in Chinese with English Abstract) |
| Gao, R., Wu, G. J., 1996. Lithosphere Structure and Geody-namic Model of Golmud-Ej in B. Geoscience Transect in North Tibet. Acta Geoscientia Sinica, Special Issue: 16-21 |
| Gao, S., Liu, X. M., Yuan, H. L., et al., 2002. Analysis of Forty-Two Major and Trace Elements of USGS and NIST SRM Glasses by LA-ICPMS. Geostand Newsl., 22: 181-195 |
| Geological Surveying Team 1 of Gansu Province, 1965. I-48-(02) Linxia 1/200 000 Geological Surveying Report (in Chinese) |
| Geological Surveying Team 1 of Gansu Province, 1995a. I-48-E001006 Yongjing 1/50 000 Geological Surveying Report (in Chinese) |
| Geological Surveying Team 1 of Gansu Province, 1995b. Yangzhai 1/50 000 Geological Map Manual (in Chinese) |
| Geological Surveying Team 1 of Gansu Province, 1995c. Wan-longshan 1/50 000 Geological Map Manual (in Chinese) |
| He, Y. H., Sun, Y., Chen, L., et al., 2005. Zircon U-Pb Chro-nology of Longshan Complex by LA-ICP-MS and Its Geological Signficance. Acta Petrologica Sinica, 21(1): 126-134 (in Chinese with English Abstract) |
| Li, Q. S., Cui, Z. Z., 1996. Crustal Velocity Structure and Geo-tectonic in Golmud-Ej in Deep Seismic Sounding Profile 1. Acta Geoscientia Sinica, Specil Issue: 41-47 |
| Li, X. Z., Han, B. F., Li, Z. H., et al., 2005. Mechanism of the Karamay Basic-Intermediate Dyke Swarm from Xinjiang and Tectonic Implications. Geological Review, 51(5): 517-522 (in Chinese with English Abstract) |
| Liu, X. M., Gao, S., Yuan, H. L., et al., 2002. Analysis of 42 Major and Trace Elements in Glass Standard Reference Materials by 193 nm La-ICPMS. Acta Petrologica Sinica, 18(3): 408-418 (in Chinese with English Abstract) |
| Ludwig, K. R., 1991. Isoplot- Plotting and Regression Pro-gram for Radiogenic-Isotope Data. US Geological Survey Open-File Report, 39: 91-445 |
| Lu, S. N., Yu, H. F., Zhao, F. Q., et al., 2002. Preliminary Study of Precambrian Geology in the North Tibet-Qinghai Pla-teau. Geological Publishing House, Beijing. 1-125 (in Chinese) |
| Song, S. G., Feng, Y. M., 1996. Subduction Complex Belts and Their Tectonic Implications, North Qilian Mountains. Acta Geoscientia Sinica, Special Issue: 6-9 |
| Song, S. G., 1997. Tectonic Evolution of Subductive Complex Belts in the North Qilian Mountains. Advance in Earth Sciences, 12(4): 351-365 (in Chinese with English Ab-stract) |
| Song, S. G., Zhang, L. F., Niu, Y., et al., 2004. Early Paleozoic Plate-Tectonic Evolution and Deep Continental Subduc-tion on the Northern Margin of the Qinghai-Tibet Plateau. Geological Bulletin of China, 23(9-10): 918-925 (in Chinese with English Abstract) |
| Song, Z. G., 1995. On the Proterozoic Longshan Group in the Eastern Qilian Orogen. Acta Geoscientia Sinica, (2): 204-209 (in Chinese with English Abstract) |
| Su, J. P., Zhang, X. H., Hu, N. G., et al., 2004. Geochemical Characteristics and Genesis of Adakite-Like Granites at Yema Nanshan in the Western Segment of the Central Qilian Mountains. Geology in China, 31(4): 365-371 (in Chinese with English Abstract) |
| Wan, Y. S., Yang, J. S., Xu, Z. Q., et al., 2000. Geochemical Characteristics of the Maxianshan Complex and Xin-glongshan Group in the Eastern Segment of the Qilian Orogenic Belt. Geol. Rev., 43(1): 52-68 (in Chinese with English Abstract) |
| Wan, Y. S., Xu, Z. Q., Yang, J. S., et al., 2003. The Precambrian High-Grade Basement of the Qilian Terrane and Neighboring Areas: Its Ages and Compositions. Acta Geoscientia Sinica, 24(4): 319-324 (in Chinese with English Abstract) |
| Wang, Q., Liu, X. Y., 1976. The Ancient Oceanic Crust and Tectonic Significance in Qilianshan Area, Western China. Scientia Geologica Sinica, (1): 42-55 (in Chinese with English Abstract) |
| Wu, C. L., Yang, J. S., Yang, H. Y., et al., 2004. Dating of Two Types of Granite from North Qilian, China. Acta Petrologica Sinica, 20(3): 425-432 (in Chinese with Eng-lish Abstract) |
| Wu, M. B., Fu, B. H., Liu, C. Y., 2000. Sm-Nd Isochron Age and Tectonic Setting of Amphibolites of the Longshan Group in Eastern Gansu Province. Geology-Geochemistry, 28(2): 45-50 (in Chinese with English Abstract) |
| Xia, L. Q., Xia, Z. C., Ren, Y. X., et al., 1991. The Marine Vol-canic Rocks from Qinling and Qilian Mountains. China University of Geosciences Press, Wuhan. 1-239 (in Chi-nese with English Abstract) |
| Xia, L. Q., Xia, Z. C., Xu, X. Y., 1995. Dynamics of Tec-tono-volcano-magmatic Evolution from North Qilian Mountains, China. Northwest Geoscience, 16(1): 1-28 (in Chinese with English Abstract) |
| Xia, L. Q., Xia, Z. C., Xu, X. Y., 1996. The Petrogenesis of Marine Volcanic Rocks from the North Qilian Mountains. Geological Publishing House, Beijing. 1-153 (in Chi-nese) |
| Xia, L. Q., Xia, Z. C., Ren, Y. X., et al., 2001. Tecton-ics-Volcanic Magmatism-Mineralization Dynamics of North Qilian Mountains. Geological Publishing House, Beijing. 1-222 (in Chinese) |
| Xia, Z. C., Xia, L. Q., Xu, X. Y., 1996. The Late Protero-zoic-Cambrian Active Continental Rift Volcanism in Northern Qilian Mountains. Acta Geoscientia Sinica, 17(3): 282-292 (in Chinese with English Abstract) |
| Xiao, L., Deng, Y. H., 1997. Characters of Maxianshan Defor-mation Granite Rock Body and Its Genetical Type. Acta Geologica Gansu, 6(1): 37-43 (in Chinese with English Abstract) |
| Xiao, X. C., Chen, G. M., Zhu, Z. Z., 1978. The Geological Structure Significances of Ancient Ophiolite in Qilian-shan, NW China. Acta Geologica Sinica, 52(4): 281-295 (in Chinese with English Abstract) |
| Xu, Z. Q., Xu, H. F., Zhang, J. X., et al., 1994. The Zoulang-nanshan Caledonian Subductive Complex in the North Qilian Mountains and Its Dynamics. Acta Geologica Sinica, 68(1): 1-15 (in Chinese with English Abstract) |
| Yang, Z. T., Xiao, S. Y., Xiao, C. Y., 2004. Minerogenic Fea-tures of Tungsten Deposits in the Qilian Metallogenic Belt and Regional Ore Indications. Geology in China, 31(3): 301-307 (in Chinese with English Abstract) |
| Yuan, H. L., Wu, F. Y., Gao, S., et al., 2003. La-ICPMS Zircon U-Pb Age and REE of Cenozoic Pluton in NE China. Chinese Sci. Bull., 48(14): 1511-1520 (in Chinese) doi: 10.1360/csb2003-48-14-1511 |
| Zhang, J. X., Xu, Z. Q., Chen, W., et al., 1997. A Tentative Discussion on the Ages of the Subduction-Accretionary Complex/Volcanic Arcs in the Middle Sector of North Qilian Mountains. Acta Petrologica Mineralogica, 16: 122-119 (in Chinese with English Abstract) |
| Zhang, J. X., Xu, Z. Q., Xu, H. F., et al., 1998. Framework of North Qilian Caledonian Subduction-Accretionary Wedge and Its Deformation Dynamics. Scientia Geologica Sinica, 33: 290-299 (in Chinese with English Abstract) |
| Zhang, Q., Sun, X. M., Zhou, D. J., et al., 1997. The Character-istics of North Qilian Ophiolites, Environment of Forma-tion and Their Tectonic Significance. Advance in Earth Sciences, 12(4): 366-385 (in Chinese with English Abstract) |
| Zhang, W. J., Meng, X. M., Hu, J. M., et al., 1994. The Char-acteristics and Orogenic Process of the Joint of Qil-ian-North Qinlian Orogenic Belt. Northwest University Press, Xi'an. 161-171 (in Chinese) |
| Zhang, Z. M., Coleman, R. G., Liou, J. G., 1984. An Outline of the Plate Tectonics of China. Geol. Soc. Amer. Bull. , 95: 295-312 doi: 10.1130/0016-7606(1984)95<295:AOOTPT>2.0.CO;2 |
| Zhao, S. G., 1996. The Characteristics of Qilian Orogenic Belt and Its Tectonic Evolution. Acta Geologica Gansu, 5(1): 16-29 (in Chinese with English Abstract) |
| Zhou, D. J., Chen, Y., Zhang, Q., et al., 1997. The Founding of Alaska-Type Mafic-Ultramafic Complex from Qilian County and Constraints on Qilian Mt. Tectonic Evolution. Scientia Geologica Sinica, 31(1): 122-127 (in Chinese with English Abstract) |
| Zhou, Z. Q., Cao, X. D., Hu, Y. X., et al., 1996. Early Palaeo-zoic Stratigraphy and Sedimentary-Tectonic Evolution in Eastern Qilian Mountains, China. Northwest Geoscience, 17(1): 1-50 (in Chinese with English Abstract) |
| Zuo, G. C., Liu, J. C., 1987. The Early Paleozoic Tectonic Evo-lution of North Qilian. Scientia Geologica Sinica, (1): 14-24 (in Chinese with English Abstract) |
| Zuo, G. C., Wu, H. Q., 1997. A Bisubduction-Collision Oro-genic Model of Early-Paleozoic in the Middle Part of North Qilian Area. Advance in Earth Sciences, 12(4): 307-314 (in Chinese with English Abstract) |
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