北山中部增生造山过程:构造变形和~(40)Ar-~(39)Ar年代学制约
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摘要
北山造山带是诠释中亚造山带南缘增生构造过程的关键区域之一。北山中部变质杂岩及相关侵入岩经历了复杂变质变形作用,是解剖北山增生构造演化过程的关键。本文在详细野外观察基础上,结合显微构造变形和黑云母~(40)Ar-~(39)Ar年代学研究,厘定北山中部相关岩石的变质变形时限。北山中部岩石普遍经历了韧性剪切变形。4个样品的黑云母~(40)Ar-~(39)Ar坪年龄分别为323.1±3.6Ma、296.0±3.7Ma、261.2±3.1Ma和209.2±4.0Ma,具有自北向南逐渐变年轻的特征。结合区域上岩石大地构造单元的展布特征,这些年龄反映了北山中部地区古生代至早中生代古洋壳(牛圈子洋盆)向北俯冲、造山带往南增生的过程。北山最晚的增生造山事件可能延续到三叠纪。
The Beishan Orogenic Belt is a key area for understanding the accretionary tectonics of the southern Central Asian Orogenic Belt. The pervasively deformed metamorphic complexes and associated intrusive rocks from the central segment of Beishan are keys to illuminating the accretionary history of Beishan Orogenic Belt. In order to put constraints on the timing of metamorphismdeformation for the rocks in the central Beishan,this study carried out field geological,microstructural and~(40)Ar-~(39)Ar geochronological studies on these rocks. The rocks from the central Beishan have undergone widespread ductile shearing deformation. Biotite~(40)Ar-~(39)Ar dating on four samples yield respective plateau ages of 323. 1 ± 3. 6 Ma,296. 0 ± 3. 7 Ma,261. 2 ± 3. 1 Ma and 209. 2 ± 4. 0 Ma,which are younging from the north to the south. Combined with the spatial-temporal distribution of major litho-tectonic units,these data reveal a northward subduction of oceanic plate( Niujuanzi Ocean) and southward accretion of the orogen during the Paleozoic-Early Mesozoic in the central segment of Beishan. The last orogenic pulse of the Beishan may have extended to the Triassic.
The Beishan Orogenic Belt is a key area for understanding the accretionary tectonics of the southern Central Asian Orogenic Belt. The pervasively deformed metamorphic complexes and associated intrusive rocks from the central segment of Beishan are keys to illuminating the accretionary history of Beishan Orogenic Belt. In order to put constraints on the timing of metamorphismdeformation for the rocks in the central Beishan,this study carried out field geological,microstructural and~(40)Ar-~(39)Ar geochronological studies on these rocks. The rocks from the central Beishan have undergone widespread ductile shearing deformation. Biotite~(40)Ar-~(39)Ar dating on four samples yield respective plateau ages of 323. 1 ± 3. 6 Ma,296. 0 ± 3. 7 Ma,261. 2 ± 3. 1 Ma and 209. 2 ± 4. 0 Ma,which are younging from the north to the south. Combined with the spatial-temporal distribution of major litho-tectonic units,these data reveal a northward subduction of oceanic plate( Niujuanzi Ocean) and southward accretion of the orogen during the Paleozoic-Early Mesozoic in the central segment of Beishan. The last orogenic pulse of the Beishan may have extended to the Triassic.
引文
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Li XM,Yu JY,Wang GQ and Wu P.2012.Geochronology of Jijitaizi ophiolite in Beishan area,Gansu Province,and its geological significance.Geological Bulletin of China,31(12):2025-2031(in Chinese with English abstract)
Li YJ,Zhang HA,Qian YX,Meng QL,Zhao Y and Liu YL.2010.The collision time of South Tianshan orogen,NW China.Chinese Journal of Geology,45(1):57-65(in Chinese with English abstract)
Mao QG,Xiao WJ,Windley BF,Han CM,Qu JF,Ao SJ,Zhang JE and Guo QQ.2012.The Liuyuan complex in the Beishan,NW China:A Carboniferous-Permian ophiolitic fore-arc sliver in the southern Altaids.Geological Magazine,149(3):483-506
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