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北疆及邻区石炭-二叠纪花岗岩时空分布特征及其构造意义
Spatial and temporal distribution of the Carboniferous-Permian granitoids in northern Xinjiang and its adjacent areas,and its tectonic significance
  
中文关键词:花岗岩  石炭纪  二叠纪  锆石年龄  伸展  中亚造山带
英文关键词:granitoids  Carboniferous  Permian  zircon U-Pb age  extension  Central Asian Orogenic Belt
基金项目:973项目(2007CB411307);国家自然科学基金资助项目(40702010);基本科研业务费(J0906);中国地质调查局地质调查项目 (12123206043,1212010611817)
作者单位E-mail
童 英 中国地质科学院 地质研究所 北京 100037 Yingtong@cags.ac.cn 
王 涛 中国地质科学院 地质研究所 北京 100037  
洪大卫 中国地质科学院 地质研究所 北京 100037  
韩宝福 北京大学 地球与空间科学学院 北京 100871  
张建军 中国地质科学院 地质研究所 北京 100037  
史兴俊 中国地质科学院 地质研究所 北京 100037  
王 超 中国地质科学院 地质研究所 北京 100037  
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中文摘要:
      北疆及邻区发育大量的花岗岩,其中石炭-二叠纪花岗岩较为突出。本文总结了该期花岗岩的时空分布特征。北疆及邻区不同构造单元石炭-二叠纪花岗岩特征不同,形成时代峰期也不一致。在阿尔泰,该期花岗岩主要集中在早二叠世(289~266 Ma),晚石炭世出现一个明显的岩浆宁静期;西准噶尔可以分为早石炭世(340~320 Ma)和晚石炭世—早二叠世(310~290 Ma)两期,后一期较强,铝质A型花岗岩分布广泛是该地区的一个重要特征,形成时代集中在300 Ma左右;东准噶尔地区石炭-二叠纪花岗岩多沿断裂带展布,岩浆活动从晚石炭世一直延续到早二叠世(320~270 Ma),该地区最大的特点是发育多条碱性(A型)花岗岩带,在晚石炭世—早二叠世连续产出。西天山大致可以分为3期:早石炭世(355~345 Ma)、早石炭世晚期—晚石炭世(335~305 Ma)和二叠纪(300~255 Ma)。早石炭世花岗岩主要集中在北天山,早二叠世花岗岩浆活动最为强烈,其中的碱性(A型)花岗岩不仅在南天山呈带状大面积分布,在北天山也有发育;东天山—北山是区内石炭-二叠纪花岗岩最为发育的地区,岩体数量多,分布面积广,锆石年龄主要集中在335~310 Ma和300~270 Ma,相对来说来东天山石炭纪花岗岩较多,北山二叠纪花岗岩较多。总体而言,北疆及邻区石炭-二叠纪花岗岩时代主要集中在晚石炭世—早二叠世,特别是是二叠世,整体展现出同步性,这个时期碱性岩最发育,可能揭示了不同构造背景下的伸展特点。这是整个中亚造山带及邻区大量的酸性和基性-超基性岩浆活动及暗示的伸展环境的一个缩影.
英文摘要:
      Numerous granitoids occur in northern Xinjiang and its adjacent areas, with Carboniferous-Permian granitoids being most typical. This paper summarizes the spatial and temporal distribution characteristics of these granitoids. Carboniferous-Permian granitoids show different features in different units, and the peak values of their formation epochs are also different. Formation epochs of the Carboniferous-Permian granitoids in Altay are mainly concentrated in early Permian (289~266 Ma), and late Carboniferous seemed to be a distinct magmatic calm period. Western Junggar Carboniferous-Permian granitoids formation periods can be subdivided into early Carboniferous (340~320 Ma) and late Carboniferous-early Permian (310~290 Ma), with the latter being more stronger. Aluminum A-type granites, concentratedly formed at about 300 Ma, are widely spread, constituting an important feature of western Junggar. Carboniferous-Permian granitoids in eastern Junggar occur along the fault zones and were formed mainly from late Carboniferous to early Permian (320~270 Ma), characterized by the continuous emplacement of quite a number of alkaline (A-type) granites in this region in this period. Carboniferous-Permian granitoids in western Tianshan can be divided into three stages: early Carboniferous (355~345 Ma), late early Carboniferous-late Carboniferous (335~305 Ma) and early Permian (300~255 Ma). The early Permian granitic magma activity is the strongest, and Carboniferous granitoids mainly intruded into northern Tianshan, and the early Permian alkaline (A-type) granitoids are not only distributed in a large zonal area of southern Tianshan but also spread in northern Tianshan. Eastern Tianshan-Beishan is an area with most developed Carboniferous-Permian granitoids, characterized by both large quantities and wide distribution. Zircon ages show two obvious peaks, being respectively at 335~310 Ma and 300~270 Ma. Granitoids in eastern Tianshan are mostly Carboniferous ones, whereas granitoids in Beishan are mostly Carboniferous ones. In general, Carboniferous-Permian granitoids of northern Xinjiang and its adjacent areas were mainly formed in the late Carboniferous-early Permian period, especially during the early Permian, showing synchronization in the whole region. This period is also characterized by most developed alkaline (A-type) granitoids, which is regarded as the reflection of the extensional setting, maybe revealing extension characteristics in different tectonics. This is a microcosm of lots of acid and mafic-ultramafic magmatism in the Central Asian Orogenic Belt and the implication of its extensional setting.
童 英,王 涛,洪大卫,韩宝福,张建军,史兴俊,王 超,2010,北疆及邻区石炭-二叠纪花岗岩时空分布特征及其构造意义[J].岩石矿物学杂志,29(6):619~641.
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