Zircon SHRIMP U-Pb age of intermediate-acid intrusive rocks in Kaladawan area, eastern Altun Mountains, NW China, and its implications
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摘要:
阿尔金山东段喀腊大湾地区位于北东向阿尔金走滑断裂北侧与东西向阿尔金北缘断裂所夹持的区域，该区广泛发育中酸性侵入岩，前人将其确定为晚古生代。本文运用锆石SHRIMP U-Pb方法对该区的中酸性侵入岩进行测年，获得413~514Ma的年龄，确认喀腊大湾地区早古生代岩浆活动的存在。结合前人其他方法测年数据和红柳沟一带 (喀腊大湾以西180km) 中酸性侵入岩的SHRIMP测年资料和蛇绿岩的时代，将阿尔金山东段喀腊大湾地区中酸性岩浆活动划分为碰撞前岩浆活动 (520~500Ma)、碰撞期岩浆活动 (490~470Ma) 和碰撞后岩浆活动 (440~410Ma) 三个阶段。
Abstract:Kaladawan area of eastern Altun Mountains, is tectonically sandwiched between NE-trending Altun strike-slip fault and EW-trending northern Altun marginal fault. There outcropping a series of intermediate-acid intrusive rocks which were determined as Late Paleozoic era. In this paper, the authors for the first time take measurements of SHRIMP U-Pb zircon age of the intermediate-acid intrusive rocks and give a high quality age of 413~514Ma. The results reflect that there happened a series strong magmatic intrusive activity in Early Paleozoic era. With other dating data of the intrusive rocks by other methods in the area and with SHRIMP U-Pb zircon age of the intermediate-acid intrusive and ophiolite in Hongliugou area about 180km to the west of Kaladawan area, the magmatic intrusive activity in Kaladawan area of eastern Altun Mountains can be divide to three stage as follows: pre-collision (520~500Ma), syn-collision (490~470Ma) and post-collision (440~410Ma).
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图 2
阿尔金山东段喀腊大湾地区地质构造及侵入岩年龄分布图
Figure 2.
Map of geological structure and intrusive rock and their ages in Kaladawan area, eastern part of Altun Mountains
图 3
阿尔金山东段喀腊大湾地区测年中酸性侵入岩显微照片
Figure 3.
Micro photograph of the intermediate-acid intrusive rocks in Kladawan area, Altun Mountains, NW China
图 4
喀腊大湾中酸性侵入岩锆石阴极发光图像
Figure 4.
CL images of zircons of the intermediate-acid intrusive rocks in Kladawan area, Altun Mountains, NW China
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Bureau of Geology and Mineral Resources of Xinjiang Uygur Autonomous Region. 1993. Regional Geology of Xinjiang Uygur Autonomous Region. Beijing: Geological Publishing House, 1-941(in Chinese with English abstract)
Chen BL, Jiang RB, Li L, Chen ZL, Qi WX, Liu R, Cui LL and Wang SX. 2009. The discovery of Iron ore zones in Kaladawan area within the eastern part of the Altun Mountains and its significance. Acta Geoscientica Sinica, 30(2): 143-154(in Chinese with English abstract)
Chen BL, Cui LL, Bai YF, Wang SX, Chen ZL, Li XZ, Qi WX and Liu R. 2010. A determining on displacement of the Altun Tagh sinistral strike-slip fault, NW China: New evidence from the tectonic metallogenetic belt in the eastern part of Altun Tagh Mountains. Acta Petrologica Sinica, 26(11): 3387-3396(in Chinese with English abstract)
Chen XH, Gehrels G E, Wang XF, Yang F and Chen ZL. 2003. Granite from North Altyn Tagh, NW China: U-Pb geochronology and tectonic setting. Bulletin of Mineralogy, Petrology and Geochemistry, 22(4): 294-298(in Chinese)
Chen ZL, Wan JL, Wang XF, Chen XH and Pan JH. 2002. Rapid strike-slip of the Altun Tagh fault at 8Ma and its geological implications. Acta Geoscientica Sinica, 23(4): 295-300(in Chinese with English abstract)
Compston W, Williams IS and Kirschvink JL. 1992. Zircon U-Pb ages for the Early Cambrian timescale. J. Geol. Soc. London, 149(2): 171-184
Cui JW, Tang ZM, Deng JF, Yue YJ, Meng LS and Yu QF. 1999. Altun Fault System. Beijing: Geological Publishing House, 1-249(in Chinese with English abstract)
Cui LL, Chen BL, Yang N, Chen ZL and Ding WJ. 2010. Geochemistry and genesis of basic-intermediate volcanic rocks from Kaladawan, east Altun Tagh Mountains. Journal of Geomechanics, 16(1): 96-107(in Chinese with English abstract)
Gehrels GE, Yin A and Wang XF. 2003. Magmatic history of the northeastern Tibetan Plateau. J. Geophys. Res. , 108(B9): 2423, doi: 10.1029 / 2002 JB001876
Guo ZJ, Zhang ZC and Wang JJ. 1998. Sm-Nd isochron age and its geotectonic significance of ophiolite belts in the margin area of Altun Mountains. Chinese Science Bulletin, 43(18): 1981-1984(in Chinese)
Liu L, Che ZC, Wang Y, Luo JH, Wang JQ and Gao ZQ. 1998. The evidences of Sm-Nd isochron age for the Early Paleozoic ophiolite in Mangya area, Altun Mountains. Chinese Science Bulletin, 43(9): 754-756
Liu L, Che ZC, Wang Y, Luo JH and Chen DL. 1999. The petrological characters and geotectonic setting of high-pressure metamorphic rock belts in Altun Mountains. Acta Petrologica Sinica, 15(1): 57-64(in Chinese with English abstract)
Liu YJ, Neubauer F, Genser J, Ge XH, Takasu A, Yuan SH, Chang LH and Li WM. 2007. Geochronology of the initiation and displacement of the Altyn Strike-Slip Fault, western China. Journal of Asian Earth Sciences, 29(2-3): 243-252
Liu YS, Xin HT, Zhou SJ, Teng XJ, Yang JQ and Lu HQ. 2010. Tectonic Evolution of Precambrian and Paleozoic Era in Lapeiquan Area, Eastern Altun Tagh Mountains. Beijing: Geological Publishing House, 1-211(in Chinese)
Ludwig KR. 2001. Squid 1.02: A user's manual: Berkeley Geochronology Center Special Publication No. 2, 15-35
Ludwig KR. 2003. User's manual for Isoplot 3.00: A geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center Special Publication, 40: 1-70
Qi XX, Li HB, Wu CL, Yang JS, Zhang JX, Meng FC, Shi RD and Chen SY. 2005. Zircon SHRIMP dating of granodiorite in the Qiashikansayi area, northern Altun Tagh Mountains. Chinese Science Bulletin, 50(6): 571-576(in Chinese)
Sobel ER and Arnaud N. 1999. A possible Middle Paleozoic suture in the Altun Tagh, NW China. Tectonics, 18(1): 64-74
Song B, Zhang SH, Wang YB and Zhao Y. 2006. Avoidance of systematic bias of SHRIMP zircon U-Pb dating: Necessity of staged calibrations. Rock and Mineral Analysis, 25(1): 9-14(in Chinese with English abstract)
Williams IS, Buick S and Cartwright I. 1996. An extended episode of Early Mesoproterozoic metamorphic fluid flow in the Reynolds Range, central Australia. J. Metamorph. Geol. , 14(1): 29-47
Williams IS. 1998. U-Th-Pb geochronology by ion microprobe. Rev. Econ. Geol. , 7: 1-35
Wu CL, Yang JS, Yao SZ, Zeng LS, Chen SY, Li HB, Qi XX, Wooden JL and Mazadab FK. 2005. Characteristics of the granitoid complex and its zircon SHRIMP dating at south margin of the Bashikaogong basin, north Altun, NW China. Acta Petrologica Sinica, 21(3): 846-858(in Chinese with English abstract)
Wu CL, Yao SZ, Zeng LS, Yang JS, Wooden J L, Chen SY and Mazadab FK. 2007. Characteristics of the granitoid complex and its zircon SHRIMP dating in the Bashikaogong-Simi'erbulake area, north Altun, NW China. Science in China(Series D), 37(1): 10-26(in Chinese)
Yang JS, Shi RD, Wu CL, Su DC, Chen SY, Wang XB and Wooden J. 2008. Petrology and SHRIMP age of the Hongliugou ophiolite at Milan, north Altun, at the northern margin of the Tibetam. Acta Petrologica Sinica, 24(7): 1567-1584(in Chinese with English abstract)
Yang Y, Chen XH, Gehrels GE, Wang XF, Qin H, Chen ZL, Yang F, Chen BL and Li XZ. 2004. Early Paleozoic magmatism and gold metallogenesis in Altun Mountains, Northwest China. Mineral Deposits, 23(4): 464-472(in Chinese with English abstract)
Yin A, Rumelhart PE, Butler R, Cowgill E, Harrison TM, Foster DA, Ingersoll RV, Zhang Q, Zhou XQ, Wang XF, Hanson A and Raza A. 2002. Tectonic history of the Altyn Tagh fault system in northern Tibet inferred from Cenozoic sedimentation. Geological Society of America Bulletin, 114(10): 1257-1295
Zhang JX, Meng FC, Yu SY, Chen W and Chen SY. 2007. 39Ar-40Ar geochronology of high-pressure/low-temperature blueschist and eclogite in the North Altyn Tagh and their tectonic implications. Geology in China, 34(4): 558-564(in Chinese)
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