| 伊犁盆地南缘隆升剥蚀及其盆地南部的沉积——利用磷灰石裂变径迹分析 |
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| 引用本文： | 韩效忠,李胜祥,蔡煜琦,郑恩玖,陈正乐,张字龙,刘权.伊犁盆地南缘隆升剥蚀及其盆地南部的沉积——利用磷灰石裂变径迹分析[J].岩石学报,2008,24(10):2447-2255. |
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| 作者姓名： | 韩效忠 李胜祥 蔡煜琦 郑恩玖 陈正乐 张字龙 刘权 |
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| 作者单位： | 中国地质大学(北京), 北京 100083;核工业北京地质研究院, 北京 100029;核工业北京地质研究院, 北京 100029;核工业216大队, 乌鲁木齐 830011;中国地质科学院地质力学所, 北京 100081;核工业北京地质研究院, 北京 100029;中国地质大学(北京), 北京 100083 |
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| 基金项目： | 国家重点基础研究发展规划项目(编号2003CB21460504)和国家“305”项目(编号2003BA612A-06-14)共同资助成果 |
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| 摘 要： | 分析了伊犁盆地南缘蚀源区14件磷灰石样品,其中南缘中西部10件,东部4件。磷灰石裂变径迹表观年龄及其与高程的关系、单颗粒年龄、封闭径迹分布特征表明,伊犁盆地南缘样品均遭受了不同程度的退火,但没有发生明显的区域性热事件。通过封闭径迹正演热史模拟得出,伊犁盆地南缘中新生代构造演化经历了三叠纪—侏罗纪晚期快速隆升,白垩纪—古近纪相对稳定和新构造快速隆升三个阶段。东西两段略有不同,西段隆升时间较早,样品所在地在早三叠世就开始强烈隆升,说明当时该处离原型盆地边界较近,而东段此时样品所在位置还可能接受沉积,直至中侏罗世末期才开始隆升剥蚀。侏罗纪原型盆地南部边界至少跨过大板煤矿,因为在该处出露中侏罗世西山窑组残留地层。相应的稳定阶段东段要滞后一些,稳定时间相对较短,西段该时段长达100Ma,而东段多在50～60Ma。新构造运动强烈活动的时间东段相对较早,局部地段在38Ma就开始隆升。盆地南缘沉积相带的发育特征和新近纪(或第四纪)内给出的电子自旋共振年龄(ESR)均说明,沉积对构造具明显的响应,盆缘快速隆升阶段其盆地内相应的沉积物较粗,相对稳定阶段对应的沉积较细或缺失。
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| 关 键 词： | 伊犁盆地南缘 磷灰石裂变径迹 构造演化阶段 沉积响应 |
Uplift-denudation in the south margin and its sedimentary response in the southern Yili basin: Analysis apatite fission track method |
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| HAN XiaoZhong,LI ShengXiang,CAI YuQi,ZHENG EnJiu,CHEN ZhengLe,ZHANG ZiLong and LIU Quan.Uplift-denudation in the south margin and its sedimentary response in the southern Yili basin: Analysis apatite fission track method[J].Acta Petrologica Sinica,2008,24(10):2447-2255. |
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| Authors: | HAN XiaoZhong LI ShengXiang CAI YuQi ZHENG EnJiu CHEN ZhengLe ZHANG ZiLong and LIU Quan |
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| Institution: | China University of Geoscience(Beijing) , Beijing 100083, China;Beijing Research Institute of Uranium Geology, Beijing 100029, China;Beijing Research Institute of Uranium Geology, Beijing 100029, China;Geological Party No. 216, CNNC, Urumqi 830011, China;Institute of Geomechanics, Chinese Academy of Geological Science ,Beijing 100081, China;Beijing Research Institute of Uranium Geology, Beijing 100029, China;China University of Geoscience(Beijing) , Beijing 100083, China |
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| Abstract: | 14 apatite samples, of which 10 samples were collected in the midwest segment and 4 samples were collected in the east segment, are analyzed from the south denudation area of Yili basin. The characteristics of apparent age and its relationship with altitude, single grain age, confined fission-track length distribution of apatite fission track show that these samples have annealinged in some extent but have not suffered from obvious regional thermal event. The simulation of normal thermal history by confined fission-track demonstrates that there are three tectonic evolution stages during the Mesozoic-Cenozoic in the south margin area of Yili basin, quick uplift stage in Triassic to the Later Jurassic period, relatively stabilize stage in Cretaceous to Paleogene Period and quick uplift stage in neotectonic period. The tectonic evolution is different a little between the east and the west segment in Yili basin. The west segment uplift early which started intensively from the Early Triassic period by analyzing samples to show that here was far from borderline of archetype basin, when the east segment maybe still accepted sediment until the end of the Middle Jurassic. The south borderline of Jurassic archetype basin strides at least Daban coal mine where mid-Xiashanyao Formation of the Jurassic reveals. Stable phase in the east segment which was 50~60Ma is shorter than in west segment which was 100Ma. The neotectonic strong movement was early in the east segment to uplift from 38Ma. The characteristics of sediment facies in the south basin and the age of Electron Spin Resonance (ESR) ages in Neocene or Quaternary demonstrate that there is obvious response between sediment and tectonic movement. The sediment is coarse-grained when uplift quickly around basin, and is fine-grained or absent in relative stable phase. |
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| Keywords: | The south margin area of Yili Basin Apatite fission track Tectonic evolvement phase Sedimentary response |
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