The loess is of importance to understand the progress of environmental evolution in Northwest China, which should be based on the reliable age. Because of the limit of the dating means, the conclusions on the age of loess along the north flank of the Tianshan Mountains are controversial, which makes it difficult to understand the environmental implication of the loess. Loess-paleosol series and the dating method based on the structure of geomorphologic complexs make it possible to date the geomorphologic complex and the related deposites. This study aims at giving the age of the loess along the north flank of the Tianshan Mountains. Based on the detailed field work, seven fluvial terraces have been identified along major river channels, and the distribution of loess is thought to be related with these terraces and corresponding alluvial fans. The oldest loess in the north piedmont of the Tianshan Mountains is distributed on the highest terrace T7, and the younger loess on the T6 is more extensive. Loess-paleosol series and the ESR age indicate that the age of the oldest loess in the north piedmont of the Tianshan Mountains is 0.54 Ma.
LU Hong-Hua, LI You-Li, NAN Feng, SI Su-Pei
. Character and Age of Loess along North Piedmont of Tianshan Mountains[J]. SCIENTIA GEOGRAPHICA SINICA, 2008
, 28(3)
: 375
-379
.
DOI: 10.13249/j.cnki.sgs.2008.03.375
[1] 刘东生. 中国黄土堆积[M]. 北京: 科学出版社, 1965.
[2] 刘东生, 张宗古. 中国黄土[J]. 地质学报,1962, 42(1): 1~14.
[3] 周廷儒. 新疆第四纪陆相沉积的主要类型及其和地貌气候发展的关系[J]. 地理学报. 1963, 29(2): 109 ~129.
[4] 张云林. 天山北麓的黄土堆积[J]. 新疆地质,1981, 42(1): 21~39.
[5] 张鸿义, 王焕章, 韩淑媞, 等. 天山北麓的黄土地层与古气候[C].//新疆大学. 干旱区新疆第四纪研究论文集. 乌鲁木齐: 新疆人民出版社, 1985:95~106.
[6] 方小敏, 史正涛, 杨胜利, 等. 天山黄土和古尔班通古特沙漠发育及北疆干旱化[J]. 科学通报. 2002, 47(7): 540~545.
[7] 张培震, 邓起东, 徐锡伟, 等. 天山北麓玛纳斯活动逆断裂-褶皱带的变形特征与构造演化[C].// 活动断裂研究编辑委员会. 活动断裂研究(Ⅲ). 北京: 地震出版社, 1994:8~32.
[8] 袁庆东, 郭召杰, 张志诚, 等. 天山北缘河流阶地形成及构造变形定量分析[J]. 地质学报,2006, 80(2): 210~216.
[9] 赵景波, 黄春长. 陕西黄土高原晚更新世环境变化[J]. 地理科学, 1999, 19(6): 565~569.
[10] 邓起东, 冯先岳, 张培震, 等. 天山活动构造[M]. 北京: 地震出版社, 2000: 339.
[11] 李有利, 史兴民, 傅建利, 等. 山西南部1.2 Ma B. P.的地貌转型事件[J]. 地理科学, 2004, 24(3): 292~297.
[12] 黄镇国, 张伟强. 中国热带第四纪板块构造的地貌效应[J]. 地理科学, 2004, 24(3): 286~291.
[13] 高红山, 潘保田, 邬光剑, 等. 祁连山东段河流阶地的形成时代与机制探讨[J]. 地理科学, 2005, 25(2): 197~202.
[14] 杨 东, 方小敏, 彭子成, 等. 陇西六盘山黄土及最近 1.8 Ma B. P.以来的构造运动与气候变化[J]. 地理科学, 2006, 26(2): 192~198.
[15] 胥勤勉, 杨达源, 葛兆帅, 等. 金沙江三堆子-东德河段阶地研究[J]. 地理科学, 2006, 26(5): 609~615.
[16] 胡春生, 潘保田, 高红山, 等. 最近150 ka河西地区河流阶地的成因分析[J]. 地理科学, 2006, 26(5): 603~608.
[17] 许刘兵,周尚哲.河流阶地形成过程及其驱动机制再研究[J]. 地理科学,2007,27(5):672~677.
[18] 胡小飞,潘保田,苏 怀,等.宛川河阶地的年代与下切机制[J]. 地理科学,2007,27(6):808~813.
[19] 方世虎, 贾承造, 郭召杰, 等. 准噶尔盆地南缘前陆冲断带形成时间的初步厘定[J]. 地学前缘, 2005, 12(3): 66.
[20] Molnar P, Brown E T, Burchfiel B C, et al. Quaternary climate change and the formation of river terraces across growing anticlines on the north flank of the Tien Shan, China[J]. Journal of Geology, 1994, 102: 583-602.
[21] Lu H Y, Liu X D, Zhang F Q, et al. Astronomical calibration of loess-paleosol deposits at Luochuan, central Chinese Loess Plateau[J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 1999, 154: 237-246.
[22] 吴海斌, 郭正堂, 方小敏, 等. 250 ka B.P.前后中国北方干旱区扩张及其成因[J]. 科学通报, 2002, 47(17): 1341~1346.
