新疆准噶尔晚古生代陆壳垂向生长(Ⅰ)——后碰撞深成岩浆活动的时限
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摘要: 准噶尔是新疆北部古生代造山带的重要组成部分,以广泛发育晚古生代后碰撞花岗岩为特征,是中亚造山带中显生宙陆壳生长作用非常显著的地区之一。根据新近获得的SHRIMP锆石U-Pb年龄,并参考已经发表的锆石U-Pb年龄,本文重新厘定了准噶尔晚古生代后碰撞深成岩浆活动的时限。按照最新的国际地质年表中石炭纪和二叠纪划分方案(Gradstein et a1.,2004),准噶尔后碰撞深成岩浆活动是从早石炭世中-晚维宪期开始、于早二叠世末期结束的。东准噶尔后碰撞深成岩浆活动发生在330-265Ma之间,而西准噶尔后碰撞深成岩浆活动的时限在340-275Ma之间,持续时间分别约65Ma。但是,在东准噶尔,后碰撞深成岩浆活动集中在330~310Ma和305~280Ma两个时段发生,而在西准噶尔,后碰撞深成岩浆活动的高峰发生在310~295Ma之间。准噶尔晚古生代后碰撞深成岩浆活动在空间上没有受到重要地质界线(如蛇绿岩带)的分隔控制,在有的地方花岗岩还可以侵位在蛇绿岩带之中。而晚古生代后碰撞深成岩浆活动不但在准噶尔分布广泛,而且在准噶尔北邻的阿尔泰造山带和南邻的天山造山带中均有出现,具有广泛的区域性。Abstract: As an important part of the Paleozoic orogenic belt in northern Xinjiang,the Junggar is characterized by intense and extensive development of Late Paleozoic granitoid plutons together with minor mafic plutons,and it is one of the representative regions for the Phanerozoic continental crustal growth in the Central Asian Orogenic Belt.On the basis of new SHRIMP zircon U-Pb dating on the plutons in the East and West Junggar,in association with the zircon U-Pb ages from the literature,an attempt is made in this study to establish the timing of the late Paleozoic post-collisional plutonism in the region.It is concluded that the Late Paleozoic post- collisional plutonism occurred from middle-late Visean of Carboniferous to the end of Early Permian in accordance to the Geological Time Scale(Gradstein et al.,2004).Temporally,the plutons in the East and West Junggar formed in a period of 65 Ma,from 330 to 265Ma and from 340 to 275Ma,respectively.However,the plutonism in the East Junggar showed two peaks of 330 to 310Ma and 305 to 280Ma,whereas most plutons in the West Junggar were emplaced from 310 to 295Ma.Spatially,the plutonism occurred in all tectonic units separated by ophiolite belts and even some granitoid plutons intruded in ophiolites.Furthermore,the post-collisional plutons can be found not only in the Junggar,but also in the Altai orogenic belt to the north and in the Tianshan orogrnic belt to the south.
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Key words:
- Late Paleozoic /
- Post-collisional plutonism /
- Continental crustal growth /
- Junggar
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[1] Ait-Djafer S,Ouzegane K,Paul-Liégeois J,Kienast JR.2003. An example of post-collisional mafic magmatism:the gabbro-anorthosite layered complex from the Tin Zebane area (western Hoggar,Algeria).Journal of African Earth Sciences 37 (3 -4):313 -330
[2] Bi CS,Sheng XY,Xu QS.1994. Isotope geology of the Beilekuduke tin metallogenic belt in Xinjiang.Geoscience of Xinjiang,No.5,Beijing:Geological Publishing House,106-119 (in Chinese with English abstract)
[3] Black LP,Kamo SL,Allen CM,et al.2003a.TEMORA 1:a new zircon standard for Phanerozoic U Pb geochronology.Chemical Geology,200:155-170
[4] Black LP,Kamo SL,Williams IS,et al.2003b.The application of SHRIMP to Phanerozoic geochronology:a critical appraisal of four zircon standards.Chemical Geology,200:171-188
[5] Bonin B.2004. Do coeval mafic and felsic magmas in post-collisional to within-plate regimes necessarily imply two contrasting,mantle and crustal,sources? A review.Lithos,78 (1-2):1-24
[6] Chen B,Arakawa Y.2005. Elemental and Nd-Sr isotopic geochemistry of granitoids from the West Junggar foldbelt (NW China),with implications for Phanerozoic continental growth.Geochimica et Cosmochimica Acta 69 (22):5387-5388
[7] Chen B,Jahn BM,Wilde S,et al.2000. Two contrasting paleozoic magmatic belts in northern Inner Mongolia,China:petrogenesis and tectonic implications.Tectonophysics,328(1 -2):157-182
[8] Chen B,Jahn BM.2004. Genesis of post-collisional granitoids and basement nature of the Junggar Terrane,NW China:Nd-Sr isotope and trace element evidence.Journal of Asian Earth Sciences,23 (5):691-703
[9] Chen JF,Zhou TX,Xie Z,et al.2000. Formation of positive εNd (t)granitoids from the Alataw Mountains,Xinjiang,China,by mixing and fractional crystallization:implication for Phanerozoic crustal growth.Tectonophysics,328 (1 -2):53-67
[10] Compston W,Williams IS,Kirschvink JL,et al..1992. Zircon U-Pb ages for the Early Cambrian time-scale.Journal of Geological Society.London,149:171-184
[11] Gao YF,Hou ZQ,Wei RH,Zhao RS.2003. Post-collisional adakitic porphyries in Tibet:Geochemical and Sr-Nd-Pb isotopic constraints on partial melting of oceanic lithosphere and crust-mantle interaction.Acta Geologica Sinica-English Edition 77 (2):194 -203
[12] Gradstain FM,Ogg JG,Smith AG.2004. A grological time scale.Cambridge:Cambridge University Press,589pp
[13] Guo JH,Chen FK,Zhang XM,Siebel W,Zhai MG.2005. Evolution of syn-to post-collisional magmatism from north Sulu UHP belt,eastern China:zircon U-Pb geochronology.Acta Petrologica Sinica,21 (4):1281 -1301 (in Chinese with English abstract)
[14] Han BF,He GQ,Wang SG,et al.1998. Postcollisional mantle-derived magmatism and vertical growth of the continental crust in north Xinjiang.Geological Review,44 (4):396-406 (in Chinese with English abstract).
[15] Han BF,He GQ,Wang SG.1999. Postcollisional mantle-derived magmatism,underplating and implications for basement of the Junggar Basin.Science in China (Series D),42(2):113 -119
[16] Han BF,He GQ,Wu TR,Li HM.2004. Zirocn U-Pb dating and geochemical features of early Paleozoic granites from Tianshan,Xinjiang:implications for tectonic evolution.Xinjiang Geology,22(1):4-11
[17] Han BF,Ji JQ,Song B,et al.2004,SHRIMP zircon U-Pb ages of Kalatongke No.1 and Huangshandong Cu-Ni-bearing mafic-ultramafic complexes,North Xinjiang,and geological implications.Chinese Science Bulletin,49 (22):2424-2429
[18] Han BF,Wang SG,Jahn BM,et al.1997. Depleted-mantle source for the Ulungur River A-type granites from North Xinjiang,China:geochemistry and Nd-Sr isotopic evidence,and implications for Phanerozoic crustal growth.Chemical Geology,138:135 -159.
[19] Hong DW,Huang HZ,Xiao YJ,et al.1994. The Permian alkaline granites in central Inner Mongolia and their geodynamic significance.Journal of Southeast Asian Earth Sciences,10:169 -176
[20] Hong DW,Zhang JS,Wang T,et al.2004. Continental crustal growth and the supercontinental cycle:evidence from the Central Asian Orogenic Belt.Journal of Asian Earth Sciences,23 (5):799 -813
[21] Hopson C,Wen J,Tilton G.et al.1989. Paleozoic plutonism in East Junggar,Bogdashan,and eastern Tianshan,NW China.EOS Trans Am Geophys Unioin,70:1403
[22] Hou GT,Liu YL,Li JH,et al.2005. The SHRIMP U-Pb chronology of mafic dyke swarms:A case study of Laiwu diabase dykes in western Shandong.Acta Petrologica et Mineralogica,24 (3):179-185 (in Chinese with English abstract)
[23] Huang X,Jin CW,Sun BS,et al.1997. Study on the age of Armantai ophiolite,Xinjiang by Nd-Sr Isotope Geology.Acta Petrologica Sinica,13 (1):85 -91 (in Chinese with English abstract)
[24] Jahn BM,Wu FY,Chen B.2000a.Granitoids of the Central Asian Orogenic Belt and continental growth in the Phanerozoic.Transactions of the Royal Society of Edinburgh Earth Sciences,91 (1-2):181-193
[25] Jahn BM,Wu FY,Chen B.2000b.Massive granitoid generation in Central Asia:Nd isotope evidence and implication for continental growth in the Phanerozoic.Episodes,23 (2):82 -92
[26] Jahn BM,Wu FY,Hong DW.2000c.Important crustal growth in the Phanerozoic:Isotopic evidence of granitoids from east-central Asia.Proceedings of the Indian Academy of Sciences Earth and Planetary Sciences,109 (1):5-20
[27] Jahn BM,Wu FY,Lo CH,Tsai CH.1999. Crust-mantle interaction induced by deep subduction of the continental crust:Geochemical and Sr-Nd isotopic evidence from post-collisional mafic-ultramafic intrusions of the northern Dabie complex,central China.Chemical Geology,157 (1-2):119-146
[28] Jian P,Liu DY,Zhang q,et al.2003. SHRIMP dating of ophiolite and leucocratic rocks within ophiolite.Earth Sciences Frontiers (China University of Geosciences,Beijing),10(4):439 -456 (in Chinese with English abstract)
[29] Jiang CY,Mu YM,Bai KY,et al.1999. Chronology,petrology,geochemistry and tectonic environment of granitoids in the southern Tianshan Mountain,western China.Acta Petrologica Sinica,15 (2):298-308
[30] Jin CW,Zhang XQ.1993. A geochronology and geneses of the western Junggar granitoids,Xinjiang,China.Scientia Geologica Sinica,28(1):28-36 (in Chinese with English abstract)
[31] Kwon ST,Tilton GR,Coleman RG,et al.1989. Isotopic studies bearing on the tectonics of the West Junggar region.Tectonics,8(4):719 -727
[32] Li HQ,Xie CF,Chang HL,et al.1998. Study on mentallogenetic chronology of nonferrous and precious metallic ore deposits in north Xinjiang,China.Beijing:Geological Publishing House.1-264 (in Chinese with English abstract)
[33] Li JY.1995. Main characteristics and emplacement processes of the East Junggar ophiolites,Xinjiang,China.Acta Petrologica Sinica,11(Suppl.):73 -84 (in Chinese with English abstract)
[34] Li JY.2004. Late Neoproterozoic and Paleozoic tectonic framework and evolution of eastern Xinjiang,NW China.Geological Review,50(3):304 -322 (in Chinese with English abstract)
[35] Li WQ,Xia B,Wang KZ,Wang H.2006. Zircon AHRIMP age and geochemistry of Caizhong granite from East Tianshan,Xinjiang,China.Acta Geologica Sinica Chinese Edition,80(1):41 -52 (in Chinese with English abstract)
[36] Li XZ,Han BF,Ji JiQ,et al.2004. Geology,geochemistry and K-Ar ages of the Karamay basic-intermediate dyke swarms from Xinjiang and implications for crustal growth during post-collisional stage.Geochimica,33(6):574 -584 (in Chinese with English abstract)
[37] Li XZ,Han BF,Li ZH,et al.2005. Mechanism of the Karamay basicintermediate dyke swarm from Xinjiang and tectonic implications.Geological Review,51 (5):517-522 (in Chinese with English abstract)
[38] Li ZH,Han BF,Song B.2004. SHRIMP zircon U-Pb dating of the Ertaibei granodiorite and its enclave from eastern Junggar,Xinjiang,and geological implications.Acta Petrologica Sinica,20(5):1263 -1270 (in Chinese with English abstract)
[39] Li geois,J.P.,Latouche,L.,Boughrara,M.,Navez,J.,Guiraud,M.,2003. The LATEA metacraton (Central Hoggar,Tuareg shield,Algeria):behaviour of an old passive margin during the Pan-African orogeny.Journal of African Earth Sciences,Journal of African Earth Sciences 37 (3-4) 313-330
[40] Liu JY,Yuan KR.1996. A discussion on the genesis and tectonic setting of alkali granites in the Ulungur alkali-rich granite belt,Xinjiang.Geological Journal of China Universities,2 (3):257-272 (in Chinese with English abstract)
[41] Liu Wei.1993. Whole rock isochron ages of plutons,crustal movements and evolution of tectonic setting in the Altai Mts.,Xinjiang Uygur autonomous region.Geoscience of Xinjiang,No.4,Beijing:Geological Publishing House,35-49 (in Chinese with English abstract)
[42] Liu ZQ,Han BF,Ji JQ,et al.2005. Ages and geochemistry of the postcollisional granitic rocks from eastern Alataw Mountains,Xinjiang,and implications for vertical crustal growth.Acta Petrologica Sinica,21 (3):623 -639 (in Chinese with English abstract)
[43] Ludwig K R.2002a.SQUID 1.02,a user\'s manual.Berkeley Geochronology Center Special Publication No.2.2455 Ridge Road,Berkeley,CA 94709,USA
[44] Ludwig K R.2002b.Isoplot/Ex Version 2002,A Geochronological Toolkit for Microsoft Excel.Berkeley Geochronology Center Spec.Pub.1a,Berkeley,CA,USA
[45] Mao JW,Konopelko D,Seltmann R,Lehmann B,Chen W,Wang YT,Eklund O,Usubaliev T.2004. Postcollisional age of the Kumtor gold deposit and timing of Hercynian events in the Tien Shan,Kyrgyzstan.Economic Geology,99 (8):1771-1780
[46] Ouyang S,Zhu HC,Zhan JZ,et al.2004. Comparison of Permian palynofloras from the Junggar and Tarim basins and its bearing on phytoprovincialism and stratigraphy.Journal of Stratigraphy,28 (3):193 -207 (in Chinese with English abstract)
[47] Shu LS,WangYJ.2003. Late Devonian-Early Carboniferous radiolarian fossils from siliceous rocks of the Kalameili ophiolite,Xinjiang.Geological Review,49 (4):408-412 (in Chinese with English abstract)
[48] Song B,Zhang YH,Wan YS,et al.2002. Mount making and procedure of the SHRIMP dating.Geological Review,48 (Supp):26-30 (in Chinese with English abstract)
[49] Su YP,Tang HF,Hou GS,et al.2006. Geochemistry of aluminous Atype granites along Darabut tectonic belt in West Junggar,Xinjiang.Geochimica,35(1):55 -67 (in Chinese with English abstract)
[50] Sun GH,Li JY,Gao LM,et al.2005. Zircon SHRIMP U-Pb age of a dioritic pluton in the Harlik Mountain,eastern Xinjiang,and its tectonic implication.Geological Review,21 (5):463-469 (in Chinese with English abstract)
[51] Tong Y,Hong DW,and Wang T,et al.2006a.TIMS U-Pb zircon ages of the Fuyun post-orogenic linear granite plutons in the south of Altai orogen,and its implications.Acta Petrologica et Mineralogica,25(2):(in press)
[52] Tong Y,Wang T,and Kovach VP.et al.2006b.Age and origin of the Tacescan postorogenic alkali-rich intrusive rocks in southern Altai,near the Mongolian border in China and its implications for continental growth.Acta Petrologica Sinica,22 (5):1266-1278 (in Chinese with English abstract)
[53] Topuz G,Altherr R,Schwarz WH,Siebel W,Satir M,Dokuz A.2005. Post-collisional plutonism with adakite-like signatures:the Eocene Saraycik granodiorite (Eastern Pontides,Turkey).Contribution to Mineralogy and Petrology,150 (4):441 -455
[54] Wang JB,Xu X.2006. Post-collisional tectonic evolution and metallogenesis in northern Xinjiang,China.Acta Geologica Sinica Chinese Edition,80(1):23 -31 (in Chinese with English abstract)
[55] Wang SG,Han BF,Hong DW,et al.1995. Geochemistry and tectonic significance of alkali granites along Ulungur river,Xinjiang.Chinese Journal of Geochemistry,14(4):323 -335
[56] Wang T,Hong DW,Tong Y,et al.2005. Zircon U-Pb SHRIMP age and origin of post-orogenic Lamazhao granitic pluton from Altai orogen:its implications for vertical continental growth.Acta Petrologica Sinica,21 (3):640 -650 (in Chinese with English abstract)
[57] Wang T,Zheng YD,Li TB,et al.2004. Mesozoic granitic magmatism in extensional tectonics near the Mongolian border in China and its implications for crustal growth.Journal of Asian Earth Sciences,23(5):715 -729
[58] Wei L,Siebel TW,Li X J,Pan XF.2005. Petrogenesis of the Linxi granitoids,northern Inner Mongolia of China:Constraints on basaltic underplating Chemical Geology,219 (1 -4):5 -35
[59] Windley BF,Kroner A,Guo JH,Qu GS,Li YY,Zhang C.2002. Neoproterozoic to Paleozoic geology of the Altai orogen,NW China:New zircon age data and tectonic evolution.Journal of Geology,110(6):719 -737
[60] Wu FY,Jabn BM,Wilde S,et al.2000. Phanerozoic crustal growth:UPb and Sr-Nd isotopic evidence from the granites in northeastern China.Tectonophysics,328 (1-2):89-113
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