塔里木板块上元古界火山岩SHRIMP定年及其对新元古代冰期时代的制约
SHRIMP dating of the upper Proterozoic volcanic rocks in the Tarim plate and constraints on the Neoproterozoic glaciation
-
摘要: 新疆库鲁克塔格地区贝义西组顶部火山岩锆石的SHRIMP定年结果为732±7Ma,它表明贝义西冰期的上限。考虑该组杂砾岩之下火山岩已有的定年结果,贝义西冰期的时限为740~732Ma。综合上元古界三层火山岩SHRIMP定年结果,可以明确地将库鲁克塔格地区上元古界四个含杂砾岩的组限定在三个时间段内,即740Ma到732Ma的贝义西组,732Ma到615Ma之间的阿勒通沟组和特瑞爱肯组,以及615Ma到542Ma之间的汉格尔乔克组,这些年龄段代表了库鲁克塔格地区新元古代各冰期的时代范围。与冰期有关的同位素年代学资料分析表明,贝义西冰期可与Kaigas冰期对比; 阿勒通沟冰期和特瑞爱肯冰期可能与Sturtian冰期和Elatina冰期对比; 而汉格尔乔克冰期和Gaskiers冰期可以对比。Abstract: The SHRIMP analyses of zircons from the volcanic rocks at the top of the Beiyisi Formation, in Quruqtagh area, Xinjiang, yield a weighted mean 206Pb/238U age of 732±7Ma, which gives the upper limit for the Beiyixi glaciation. Considering a previous age from volcanic rocks below the Beiyisi diamictites, the Beiyisi glaciation has been constrained between 740Ma and 732Ma. Combining with previous SHRIMP data from other three volcanic rock levels of the Neoproterozoic in study area, four tillite-contained formations of the Neoproterozoic can be divided into three durations from 740 to 732Ma of the Beiyixi Formation, from 732 to 615Ma of the Altungal and Tereeken formations and from 615 to 542Ma of the Hangelchaok Formation, respectively, which suggests that isolated glaciations occur during the Neoproterozoic in Quruqtagh. Data analyses related with glaciation indicate that the Beiyixi, Altungol and Tereekan and Hangelchaok glaciations could be correlated with the Kaigas, Sturtian and Elatina, and Gaskiers glaciations, respectively.
-
Key words:
- Tarim plate /
- Upper Proterozoic volcanic rock /
- SHRIMP data /
- Neoprotrozoic glaciation
-
-
[1] Allen PA, Bowring SA, Leather J, Brasier M, Cozzi A, Grotzinger JP,McCarron G and Amthor J. 2002. Chronology of Neoproterozoic glaciations: New insights from Oman. Abstract Volume, 16th International Sedimentological Congress: Johannesburg, International Association of Sedimentologists, 7 - 8
[2] Beodiselitsch B, Koeberl C, Master S and Reimold WU. 2005. Estimating duration and intensity of Neoproterozoic Snowball Glaciations from Ir anomalies. Science, 308 : 239 - 242
[3] Bowring S, Myrow P, Landing E, Ramezani J and Grotzinger J. 2003. Geochronological constraints on terminal Neoproterozoic events and the rise of metazoans. Geophys. Res. Abs. ,5 : 13219
[4] Cailteux JLH, Kampunzu ABH and Batumike MJ. 2005. Lithostratigraphic position and petrographic characteristics of R. A.T. ( "Roches Argilo-Talqueuses" ) Subgroup, Neoproterozoic Katangan Belt (Congo). Journal of African Earth Sciences, 42:82 - 94
[5] Cao RG. 1991. New obvservations of the Sinian system in the southern Yardang Mountains, Xinjiang. Geological Bulletin of China, 1 : 30 - 34 (in Chinese with English abstract)
[6] Chu XL, Todt W, Zhang QR, Chen FK and Huang J. 2005. U-Pb zircon age of the Nanhua-Sinian boundary. Chinese Science Bulletin, 50 (6) : 600-603(in Chinese)
[7] Compston W, Williams IS, Kirschvink JL, Zhang Z and Ma G. 1992. Zircon U-Pb ages for the Early Cambrian time-scale. J. Geol. Soc. London, 149 : 171 - 184
[8] Condon D, Zhu M, Bowring S, Wang W, Yang A and Jin Y. 2005. U- Pb ages from the Neoproterozoic Doushantuo Formation. China. Science .308:95 - 98
[9] Fanning CM and Link PK. 2004. U-Pb SHRIMP ages of Neoproterozoic (Sturtian) glaciogenic Pocatello Formation, southeastern Idaho. Geology ,32:881 - 884
[10] Gao Z and Qian J. 1985. Sinian glacial deposits in Xinjiang, Northwest China. Precambrian Res. ,29 : 143 - 147
[11] Gao Z, Zhu S and Li YA. 1984. Precambrian Geology in Xinjiang, China. Urumuqi: Xinjiang People\\'s Publishing House, 151 (in Chinese with English abstract)
[12] Gao ZJ and Chen KQ. 2003. The Nanhua System of Xinjiang and some geological issues of Nanhua System in China. Geological Survey and Research, 26 ( 1 ) : 8 - 14 ( in Chinese with English abstract)
[13] Halverson G. 2006. A Neoproterozoic Chronology. In: Xiao S and Kaufman AJ ( eds. ). Neoproterozoic Geobiology. Dordrecht : Kluwer Academic Publishers, 231 - 172
[14] He JY, Xu B, Meng XY, Kou XW, Liu B, Wang Y and Mi H. 2007. Neoproterozoic sequence stratigraphy and correlation in Quruqtagh area, Xinjiang. Acta Petrologica Sinica, 23 (7) : 1645 - 1654 (in Chinese with English abstract)
[15] Hoffman PF, Kaufman AJ and Halverson GP. 1998. Comings and goings of global glaciations on a Neoproterozoic tropical platform in Namibia. GSA Today, 8 ( 5 ) : 1 - 9
[16] Hoffmann KH, Condon D J, Bowring SA and Crowley JL. 2004. U-Pb zircon date from the Neoproterozoic Ghaub Formation, Namibia: Constraints on Marinoan glaciation. Geology, 32:817 -820
[17] Hoffmann KH, Condon DJ, Bowring SA, Prave AR and Fallick A. 2006. Lithostratigraphic, carbon (d^13 C) isotope and U-Pb zircon age constraints on early Neoproterozoic (ca. 755 Ma) glaciation in the Gariep Belt, southern Namibia- Snowball Earth Conference, July 16-21,2006, Monte Verita, Ticino, Switzerland, 51
[18] Kay RM, Liyungu AK, Njamu FM, Somwe V, Banda J, Mosley PN and Armstrong RA. 2001. The western arm of the Lufilian Arc in NW Zambia and its potential for copper mineralization. Journal of African Earth Sciences,33:503 - 528
[19] Kendall B, Ceaser RA and Selby D. 2006. Re-Os gerochronology of postglacial black shales in Australia: Constraints on the timing of "Sturtian"glaciation. Geology, 34(9): 729-732
[20] Kou XW, Wang Y, Wei W, He JY and Xu B. 2008. The Neoproterozoic Altungol and Huangyanggou formations in Tarim plate: Recognized newly glaciation and interglaciation? Acta Petrologica Sinica, 24 ( 12 ) :2863 - 2868 ( in Chinese with English abstract)
[21] LiuB, XuB, MengXY, Kou XW, He JY, Wei W and Mi H. 2007. Study on the chemical index of alteration of Neoproterozoic strata in the Tarim plate and its implications. Acta Petrologica Sinica, 23 (7) : 1664 -1670 (in Chinese with English abstract)
[22] Lund K, Aleinkoff JN, Evans KV and Fanning CM. 2003. HRIMP U-Pb geochronology of Neoproterozoic Windermere Supergroup, central Idaho : Implications for rifting of western Lauerntia and synchroneity of Sturtian glacial deposits. GSA Bull. 115 : 349 -372
[23] Ludwig KR. 2001. SQUID version 1.02: A geochronological Toolkit for Microsoft Excel. Berkley Geochronological Centre Special Publication no. 2, 1-19
[24] Ludwig KR. 2001. Users manual for Isoplot/Ex rev. 2.49. Berkeley Geochronology Centre Special Publication no. 1 a, 1 -56
[25] Shen B, Xiao S, Kaufman A J, Bao H, Zhou C and Wang H. 2008. Stratification and mixing of a post-glacial Neoproterozoic ocean: Evidence from carbon and sulfur isotopes in a cap dolostone from northwest China. Earth Planet. Sci. Lett. , 265:209-228
[26] Song B, Zhang YH, Wan YS and Jian P. 2002. Mounting and analytical procedure of zircon SHRIMP dating. Geol. Rev. , 48( supp. ) :26 - 30 (in Chinese with English abstract)
[27] Thompson MD and Bowring SA. 2000. Age of the Squantum "tillite", Boston Basin, Massachusetts: U-Pb zircon constraints on terminal Neoproterozoic glaciation. Am. J. Sci. ,300:630 - 655
[28] Xiao S, Bao H, Wang H, Kaufman A, Zhou C, Li G, Yuan X and Ling H. 2004. The Neoproterozoic Quruqtagh Group in eastern Chinese Tianshan: Evidence for a post-Marinoan glaciation. Precambrian Res. ,130:1-26
[29] Xu B, Zheng H, Yao H and Li Y. 2003. C-isotope composition and significance of the Sinian on the Tarim plate. Chinese Sci. Bull. ,48 (4) :385 -389
[30] Xu B, Jian P, Zheng HF, Zou HB, Zhang LF and Liu DY. 2005. U-Pb zircon geochronology and geochemistry of Neoproterozoic volcanic rocks in the Tarim Block of northwest China: Implications for the breakup of Rodinia supercontinent and Neoproterozoic glaciations. Precambrian Res. , 136 : 107 - 123
[31] Xu B,Xiao SH,Zou HB, Chen Y, Li ZX, Song B, Liu DY, Zhou CM and Yuan XL. 2008. SHRIMP zircon U-Pb age constraints on Neoproterozoic Quruqtagh diamictites in NW China. Precambrian Res. , (in press)
[32] Yin CY, Tang F, Liu YG, Gao LZ, Liu PJ, Xing YS, Yang ZQ, Wang YS and Wang ZQ. 2005. U-Pb zircon age from the base of the Ediacaran Doushantuo Formation in the Yangtze Gorges, South China: Constraint on the age of Marinoan glaciation. Geol. Bull. China, 24:393 - 400
[33] Zhang QR, Li XH, Feng LJ, Huang J and Song B. 2008. A new age constraint on the onset of the Neoproterozoic Glaciations in the Yangtze Platform, South China. Journal of Geology, 116(4) : 423 - 429
[34] Zhou C, Tucher R, Xiao S, Peng Z, Yuan X and Chen Z. 2004. New constrains on the ages of Neoproterozoie glaciations in South China. Geology,32:437 -440
[35] 高振家 朱诚顺 李永安.新疆前寒武纪地质[M].乌鲁木齐:新疆人民出版社,1984.1-151.
[36] 宋彪 张玉海 万渝生 等.锆石SHRIMP样品靶制作、年龄测定及有关现象讨论[J].地质论评,2002,48(增刊):26-30.
[37] 李永安 姚海涛 郑海飞 徐备.塔里木板块震旦系碳同位素组成及其意义[J].科学通报,2002,47(22):1740-1744.
[38] 尹崇玉 刘敦一 高林志 王自强 邢裕盛 简平 石玉若.南华系底界与古城冰期的年龄:SHRIMPⅡ定年证据[J].科学通报,2003,48(16):1721-1725.
-
计量
- 文章访问数: 7659
- PDF下载数: 9513
- 施引文献: 0
下载: