globalchange  > 气候变化与战略
CSCD记录号: CSCD:5388508
论文题名:
准噶尔西北部山地晚新生代以来隆升过程:来自沉积学和磁组构的证据
其他题名: Tectonic Uplift of Mountains in Northwestern Junggar since Late Cenozoic: Evidences from Sedimentology and Magnetic Fabric in Heshituoluogai Basin
作者: 艾可可; 季军良
刊名: 地球科学
ISSN: 1000-2383
出版年: 2015
卷: 40, 期:3, 页码:136-140
语种: 中文
中文关键词: 沉积相 ; 磁组构 ; 西准噶尔 ; 构造隆升 ; 晚新生代
英文关键词: sedimentary facies ; magnetic fabric ; western Junggar ; tectonic uplift ; Late Cenozoic
WOS学科分类: GEOLOGY
WOS研究方向: Geology
中文摘要: 通过对准噶尔西北缘和什托洛盖盆地新近系白杨河剖面详细的沉积学和磁组构的研究,探讨了准噶尔西北部山地约7Ma以来的构造变化.白杨河剖面由下至上可划分为塔西河组、独山子组和西域组,分别对应于浅湖相、扇三角洲相和砾质辫状河相.古流向和砾石成分分析表明,剖面物源来自和什托洛盖盆地北侧山地.根据沉积学和磁化率与磁组构参数(P_j、T、L和F)的变化,准噶尔西北部地区约7Ma以来的构造-环境演变可划分为3个阶段:阶段Ⅰ(6.80~3.50Ma):浅湖相,磁化率和磁组构参数值为剖面最低,且变化幅度很小,代表了构造环境比较稳定,地势高差较小或物源区较远;阶段Ⅱ(3.50~ 2.58Ma):扇三角洲相,沉积速率、磁化率和磁组构参数值显著增大,表明准噶尔西北部山地强烈隆升;阶段Ⅲ(<2.58Ma):砾质辫状河相,磁化率和磁组构参数值进一步增大,可能是构造隆升与气候变化共同作用的结果.3.50Ma准噶尔西北部山地强烈的构造隆升与天山地区和青藏高原周缘约3.00~4.00Ma的构造隆升具有准同时性,是印度-欧亚板块陆内俯冲挤压远程效应表现.
英文摘要: Through the results of detailed sedimentological and magnetic fabric study,on the Heshituoluogai basin,northwestern Junggar,we discussed the tectonic evolution since 7 Ma ago in the northwestern Junggar.The Baiyanghe section can be divided into Taxihe Formation,Dushanzi Formation and Xiyu Formation from bottom to up,corresponding to the lacustrine facies,fan delta facies and gravelly braided river facies.Paleocurrent and provenance analysis shows that the provenance of the section comes from the northern mountains nearby the basin.On the basis of the sedimentterological and magnetic fabric results,we divided the tectonic-sedimentary evolution of northwestern Junggar into three stages since 7Ma ago:Ⅰ(6.80- 3.50Ma),lacustrine facies,lowest magnetic susceptibility and magnetic fabric parameters with small changes,indicating a stable tectonic environment,small topographic elevation difference or far provenance area;Ⅱ(3.50-2.58Ma),fan delta facies, significant increase of the sedimentation rate,magnetic fabric parameters and magnetic susceptibility all suggest that the northwestern Junggar mountains underwent intense tectonic uplift;Ⅲ(<2.58Ma),gravelly braided river facies,magnetic fabric parameters and magnetic susceptibility increases further,which coused by tectonic uplift and climate change together.The tectonic uplift of the northwestern Junggar mountains occured at 3.50 Ma is almost synchronous with the uplift of the Tianshan Mountains and the Tibetan plateau occurred at 3.00-4.00 Ma,which is influenced by the far-filed effects of the India-Asia intracontinental subduction extrusion.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/149163
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作者单位: 中国地质大学(武汉), 生物地质与环境地质国家重点实验室, 武汉, 湖北 430074, 中国

Recommended Citation:
艾可可,季军良. 准噶尔西北部山地晚新生代以来隆升过程:来自沉积学和磁组构的证据[J]. 地球科学,2015-01-01,40(3):136-140
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