...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Quaternary Research: An Interdisciplinary Journal >Late quaternary downcutting rates of the Qianyou River from U/Th speleothem dates, Qinling mountains, China
【24h】

Late quaternary downcutting rates of the Qianyou River from U/Th speleothem dates, Qinling mountains, China

机译：秦岭U / Th蛇牙根期前游河的第四纪晚期截水率

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Dating deposits in eaves formed by rivers may yield insight into rates and processes of bedrock incision. Three cave passages at different levels have developed in the walls of the Qianyou River valley in the Qinling mountains, south of the city of Man, China. Twelve speleothem samples near the position of palaeowater tables in three cave passages are dated by the Th-230 dating method. The results show that the river cut down at the rate of 0.23 +/- 0.02 mm/yr from 358,000 +/- 38,000 to 247,000 +/- 28,000 yr ago, 0.19 +/- 0.03 mm/yr from 247,000 +/- 28,000 to 118,000 +/- 19,000 yr ago, and 0.51 +/- 0.08 mm/yr from 118,000 +/- 19,000 yr ago until today. These fall very close to the glacial-interglacial transition following marine oxygen isotope stages 10, 8, and 6, respectively. The increase in downcutting rates during the interglacial period is consistent with warm, wet weather, increasing rates of erosion. This may lead us toward an underlying mechanism for modulating incision that is not in a direct response to the presence of headwater glaciers. (C) 2004 University of Washington. All rights reserved.
机译：河流形成的屋檐中的约会沉积物可能使人们深入了解基岩切割的速率和过程。在中国曼市以南的秦岭千游河谷墙中，形成了三个不同高度的洞穴通道。 Th-230测年法对三个洞穴通道中古地下水位附近的十二个针叶菊进行了采样。结果表明，河流以每年0.23 +/- 0.02毫米/年的速度从358,000 +/- 38,000下降到247,000 +/- 28,000年前，以0.19 +/- 0.03毫米/年的速度从247,000 +/- 28,000下降到118,000 +/- 19,000年前，以及0.51 +/- 0.08毫米/年，从118,000 +/- 19,000年前到今天。它们分别非常接近海洋氧同位素阶段10、8和6之后的冰川间过渡。在间冰期，下切率的增加与温暖潮湿的天气，侵蚀率的增加相一致。这可能将我们引向调节切口的潜在机制，而该机制并不直接响应源头冰川的存在。 （C）2004年华盛顿大学。版权所有。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号