| 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 |
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| 引用本文： | 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,2015,40(3):535-547. |
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| 作者姓名： | 艾可可 季军良 |
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| 作者单位： | 1.中国地质大学生物地质与环境地质国家重点实验室, 湖北武汉 430074 |
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| 基金项目： | 中国地质调查局项目“西准噶尔克拉玛依后山地区三维地质调查试点”(No.1212011220245);新疆1∶25万铁厂沟镇幅(L45C002001)与克拉玛依市幅(L45C003001)区调修测项目(No.1212011120502);中央高校基本科研业务费专项(No.CUGL09306) |
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| 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7 Ma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(Pj、T、L和F)的变化, 准噶尔西北部地区约7 Ma以来的构造-环境演变可划分为3个阶段: 阶段Ⅰ(6.80~3.50 Ma): 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(3.50~2.58 Ma): 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(＜2.58 Ma): 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.3.50 Ma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3.00~4.00 Ma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.
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| 关 键 词： | 沉积相 磁组构 西准噶尔 构造隆升 晚新生代 |
| 收稿时间： | 2014-09-29 |
Tectonic Rplift of Mountains in Northwestern Junggar since Late Cenozoic:Evidences from Sedimentology and Magnetic Fabric in Heshituoluogai Basin |
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| Ai Keke
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Ji Junliang.Tectonic Rplift of Mountains in Northwestern Junggar since Late Cenozoic:Evidences from Sedimentology and Magnetic Fabric in Heshituoluogai Basin[J].Earth Science-Journal of China University of Geosciences,2015,40(3):535-547. |
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| Authors: | Ai Keke Ji Junliang |
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| Affiliation: | Ai Keke;Ji Junliang;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences;Faculty of Earth Sciences,China University of Geosciences; |
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| Abstract: | 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 7 Ma ago: Ⅰ(6.80-3.50 Ma), 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(3.50-2.58 Ma), 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(< 2.58 Ma), 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. |
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| Keywords: | sedimentary facies magnetic fabric western Junggar tectonic uplift Late Cenozoic |
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