念青唐古拉山东南麓更新世冰川沉积物年龄测定  

Dating Result of the Pleistocene Glacial Deposits on the Southeast Foot of Nyaiqentanglha Mountains

作　　者：吴中海[1] 赵希涛[2] 江万[1] 吴珍汉[1] 朱大岗[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《冰川冻土》2003年第3期272-274,共3页Journal of Glaciology and Geocryology

基　　金：中国地质科学院地质调查项目 (DKD990 1001;DKD2 0 0 10 0 5 ;DKD2 0 0 10 0 6)资助

摘　　要：在念青唐古拉山南北两麓及切割山脉的各沟谷中 ,分布着 3套更新世冰川与冰水沉积物 ,其冰水沉积物的电子自旋共振 (ESR)和光释光 (OSL)测年结果分别为 ( 5 93± 2 6 0 )kaBP与 ( 6 78± 30 7)kaBP ,( 2 0 5± 5 4 )kaBP和 ( 2 5 4± 8 7)kaBP .测年结果表明 ,在念青唐古拉山东南麓所发生的 3次冰川作用 ,分别相当于青藏高原南部的聂聂雄拉冰期。Along both the south and north feet and in the valleys of West Nyaiqentanglha Mountains, there are three sets of Pleistocene glacial deposits. The first set of moraines is distributed at the feet of Nyaiqentanglha, constituting the high piedmont moraine platforms of 200～300 m above the valley bottoms. On their front margins, there are always simultaneous high fluvioglacial platforms. Along the east and west sides of the outlets of Nia valley north of Damxung County, the fluvioglacial platform was displaced by the NE direction piedmont normal fault. On the slope of the fault and the top of fluvioglacial platform, two dating samples were collected, the ESR dates are (593±260) ka BP and (678±307) ka BP, respectively. The second set of moraines is mainly distributed in the glacial troughs cutting the mountains and their outlets, constructing the high lateral and terminal moraines of 50～70 m higher than the valley bottom. At the northeast of Largen valley, the simultaneous fluvioglacial platform cut the first set of moraine, forming platform of 40～60 m higher than the valley bottom. The ESR date of calcareous cements collected from the central part of the platform is (205±54) ka BP The third set of moraines is also distributed in the glacial troughs, constituting the low lateral and terminal moraines of 15～30 m higher than the valley bottom. The OSL date of sand on the top of fluvioglacial or proluvial platform is (25\^4±8\^7) ka BP These results of dating show that the ages of the three sets of glacial deposits along the southeastern foot of Nyaiqentanglha north of Damxung should be correspond to the Nieniexiongla Glaciation, Guxiang Glaciation and Baiyu Glaciation in the south Tibetan Plateau.

关 键 词：念青唐古拉山 更新世 冰川沉积 电子自旋共振 光释光测年 ESR OSL 

分 类 号：P343.6[天文地球—水文科学] P534.631[天文地球—地球物理学]