大理苍山世界地质公园第四纪冰碛物特征及年代测定

发布时间：2018-05-15 22:04

本文选题：世界地质公园 + 点苍山　；参考：《地球学报》2016年06期

【摘要】：云南大理苍山世界地质公园具有较高的美学价值与地学科研价值,在地学研究领域中苍山又被称为点苍山。本次研究的主要区域是点苍山玉局峰北坡和点苍山西北部的罗坪山大小海子地区,本文对点苍山玉局峰北坡冰碛物和罗坪山第四纪沉积物进行了光释光年代测定,讨论了光释光测年方法在点苍山地区第四纪冰碛物测年中的适用性,测得玉局峰北坡搬运距离较远的三条冰碛垄的年龄为(31.68±3.22)~(28.01±1.95)ka BP,属于末次冰期。对罗坪山地区第四纪沉积物进行石英砂扫描电镜分析,观察到大小海子附近第四纪沉积物石英砂表面具有一定的冰川成因特征,推断罗坪山大小海子地区曾发育过第四纪冰川作用,通过光释光测年得到大小海子附近冰川沉积物年代为(136.36±10.16)ka BP,相当于倒数第二次冰期。结合前人研究,推断点苍山地区也具有发育倒数第二次冰期的可能性。
[Abstract]:Cangshan World Geopark in Dali Yunnan has high aesthetic value and geoscientific research value. Cangshan is also called DianCangshan in the field of geoscience research. The main areas of this study are the northern slope of Jade Jingfeng in Ducang Mountain and the large and small Haizi area of Luoping Mountain in the northwest of Dancang Mountain. In this paper, the moraine on the northern slope of Jade Peak and Quaternary sediments of Luopingshan were measured by photoluminescence dating. This paper discusses the applicability of the optical luminescent dating method to the dating of Quaternary moraine in Duan Cangshan area. It is found that the age of the three moraine ridges, which are far away from the northern slope of Yujing Peak, is 31.68 卤3.22 (28.01 卤1.95)ka), which belongs to the last glacial age. The quartz sand surface of Quaternary sediments near Haizi was observed by SEM analysis of Quaternary sediments in Luopingshan area. It is inferred that the Quaternary glaciation was developed in the large and small Haizi area of Luopingshan, and the age of glacial sediments near Haizi is 136.36 卤10.16)ka BP, which is equivalent to the penultimate glacial age. Combined with previous studies, it is inferred that there is the possibility of reciprocal ice age in Dancangshan area.
【作者单位】：中国地质大学(北京);中国地质科学院地质力学研究所;中国地质科学院矿产资源研究所;大理白族自治州国土资源局;
【基金】：中央级公益性科研院所基本科研业务费项目(编号:YWF201407)资助~~
【分类号】：P534.63

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