山东蒙山全新世冰川遗迹的发现及确认——来自宇生核素年龄证据

Discovery and Recognition of Holocene Glacial Remains in Mengshan Mountain in Shandong Province—Evidences from Cosmogenic Isotopes Dating Age

摘要:

针对山东蒙山发育的第四纪冰川遗迹，采用光释光的测年方法，获得了8.2ka冰期年龄值，以此为基础建立了拦马冰期，属于全新世早期。为了能够获得其他测年成果的相互验证，该次研究采用了宇生核素的测年方法，获得了3个年龄值：7.01ka，8.57ka，9.95ka，均属于全新世早期，与光释光方法获得的年龄值具有较高的一致性。在海拔752m的清荣峡谷内的冰碛表面，获得了5.27ka的全新世中期的年龄，对应冰碛建立了清荣冰期。通过该项研究，结合蒙山冰川遗迹的特征及其风化程度，反映了冰川遗迹、测年数据与环境气候之间的吻合性，综合确认了我国东部全新世早期拦马冰期、全新世中期清荣冰期的存在，也证明了全新世，在山东蒙山及我国东部中低山区受到东亚冷槽的影响,曾经存在冰川作用。

Abstract:

For the Quaternary glaciation remnents in the Mengshan Mount, glacial age of 8,2kawas obtained by using the dating method of Optically Stimulated Luminescence (OSL). Based on this result, the glacial period called "Lanma Glaciation" which belonged to the Early Holocene was confirmed. In order to confirm the results of glacial ages, we used cosmogenic-nuclide10to obtainthree values of ages ,7.01 ka、8.57 ka and 9.95 ka , which all belonged to the Early Holocene. The results using cosmogenic-nuclide are consistent with OSL.At the altitude of 752m, on the moraine surface of Qingrong Gorge, the middle Holocene age of 5.27ka was obtained, thus "Qingrong Glaciation" wasconfirmed.From this study, the Early Holocene "Lanma Glaciation" and the Middle Holocene "Qingrong Glaciation"are confirmed. Thusin Holocene period, glaciationsexisted in the Mengshan Mount as well as middle and low mountains in eastern China due to East Asian cold trough influence.