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| 秦岭中更新世以来抬升的新资料及认识 | |
| 引用本文： | 薛祥煦,李虎侯,李永项,刘护军.秦岭中更新世以来抬升的新资料及认识[J].第四纪研究,2004,24(1):82-87. |
| 作者姓名： | 薛祥煦 李虎侯 李永项 刘护军 |
| 作者单位： | 西北大学教育部大陆动力学重点实验室,新生代地质与环境研究所,西安,710069;中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安,710075;西北大学教育部大陆动力学重点实验室,新生代地质与环境研究所,西安,710069;西北大学教育部大陆动力学重点实验室,新生代地质与环境研究所,西安,710069;陕西师范大学旅游与环境科学院,西安,710062 |
| 基金项目： | 陕西省科学技术委员会，陕西省教育委员会基金项目 (批准号 :JK0 2 8和JK0 1)，中国科学院黄土与第四纪地质国家重点实验室开放基金项目 (SKILQG0 2 19)资助 |
| 摘 要： | 秦岭北坡的陕西省洛南县南洛河北岸发育高度不同的6层溶蚀洞穴,其中5层溶蚀洞穴中发现沉积物和古生物化石。对这些洞穴进行了考察和发掘,并研究了洞穴内沉积物的化石。另外对洞穴外的河流阶地进行了高程测量和对比分析,用选频光释光法测定各洞穴底部沉积物和洞穴外河流阶地沉积物的年龄,确定了各洞穴大致的形成时代,并首次得到秦岭中更新世以来的抬升资料。其抬升过程中速度不均一性、时代越新抬升速率越强的总趋势等状况与青藏高原相似 |
| 关 键 词： | 陕西洛南 洞穴群 中更新世以来 秦岭抬升 |
| 文章编号： | 1001-7410(2004)01-82-06 |
| 收稿时间： | 2003-03-26 |
| 修稿时间： | 2003年3月26日 |
THE NEW DATA OF THE UPLIFTING OF QINLING MOUNTAINS SINCE THE MIDDLE PLEISTOCENE |
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| Institution: | 1. Key Laboratory of Continental Dynamics, Ministry of Education and Institute of Cenozoic Geology and Environment, Northwest University, Xi′an 710069; 2. Institute of Earth Environment, State Key Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, Xi′an 710075; 3. College of Tourism and Environment Science, Shaanxi Normal;University, Xi′an 710062 |
| Abstract: | A group of caves, having developed in the strata of Cambrian dolomite limestone and being present in about six different altitudes, were found in the northern part of Qinling Mountains. They are situated at the hill slope behind Zhangping Village being on the left bank of South Luohe River, Luonan County, Shaanxi Province. All the caves were excavated in the past by the local farmers, but there are still more or less undisturbed sediments preserved. A serious of undisturbed fluvial sediment samples in the caves have been collected for dating by the method of selected frequency optical luminescene (SFOL). The results of the dating of the cave group, from the highest, the sixth level, downwards to the lowest, the first level, are: No.6, 0.493±0.055MaB.P.; No.4, 0.259±0.023MaB.P.; No.3, 0.205±0.019MaB.P.;?No.2,?0.031± 0.0 035MaB.P . and the No. 1, 0.028±0.0 032MaB.P. A lot of mammalian fossils (10 gen. and sp. of macro mammals and 28 gen. 23 sp. of micro ones) were collected from the same deposits of these caves. The fossils from the highest cave are Blarinella quadroticauda、Microtus oeconomus、Niviventer confucianus、Rhizomys troglodytes、Hystrix and some genera of lizard of reptile. Most of these fossils appeared also in the deposits of localities such as Loc.1 of Zhou koudian near Beijing, Loc. of Hexian Ape Man in Anhui and Xishuidong of Lantian, Shaanxi. The ages of these localities are almost all in the Middle Pleistocene. In other words, the earlier deposits of the 6th level cave of Zhangping were deposited in the Middle Pleistocene, same as that of Loc.1 of Zhoukoudian, Hexian and Xishuidong. For comparing the age of these six level cave deposits with that of the terraces of Luohe River, the authors investigated the characteristics of Luohe River terraces near the caves of Zhangping area, measured their height and collected samples of the terrace deposits for dating. The age of terrace Ⅲ which is almost at the same altitude of cave 6 or at the height range from 5th to 6th cave, is 0.526±0.051MaB.P. The terrace Ⅱ, same as cave 3 in altitude or at the height range from 3rd to 4th cave, is 0 241±0 025MaB.P. The data of the altitude and the age of both the caves and terraces can be well correlated (Tab.1) . From these, we have obtained an uplifting curve of Qinling Mountains since the Middle Pleistocene (Fig.3). From Fig.3, we may understand that the uplifting rate of Qinling Mountains since the Middle Pleistocene(about 0.5MaB.P.) has fluctuated. And the later the period, the bigger was the uplifting rate, especially since the later part of the Middle Pleistocene. It is almost consistent with the uplifting of the Qinghai Xizang Plateau. It shows that the uplifting of the Qinling Mountains is closely related with that of the Qinghai Xizang Plateau. Only the uplifting height and rate is lower and slower than that of the Qinghai Xizang Plateau, because the Qinghai Xizang Plateau is the main or center area of the uplifting. |
| Keywords: | Luonan of Shaanxi Qinling Mountains cave Middle Pleistocene uplift characteristic |
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