摘要
距今近 2万a来的古气候恢复越来越受到人们的重视 ,研究的方法途径也越来越丰富 ,利用沉积物碳酸盐碳氧同位素δ1 8O、δ1 3 C值来反演古气候就是其中之一。文章利用古堰塞湖沉积物碳酸盐碳氧同位素记录对岷江上游叠溪古气候演化特征的初步研究表明 ,在距今约 2 2 0 0 0～ 90 0 0年 (约 2 2KaBP～ 9KaBP)间该区古气候可分为 7个阶段。各个阶段的古气候特征分别为 :①约 2 2kaBP～ 2 0kaBP ,气候为冷干 ;②约 2 0kaBP～ 17kaBP ,气候为冷湿 ;③约 17kaBP～ 14kaBP ,气候为热干 ;④约 14kaBP～ 13kaBP ,气候为冷湿 ;⑤约 13kaBP～ 11kaBP ,气候为热偏干 ;⑥约 11kaBP～ 10kaBP ,气候为热干 ;⑦约 10kaBP～ 9kaBP ,气候为冷湿。
The ancient climate recovering about 20*!000 years from nowadays is valued by people and its researching means is more sufficient. One example is to use carbon and oxygen isotopes of carbonate in the deposits in the ancient barrier lake to recover the ancient climate. In this paper, based on the studies for carbon and oxygen isotopes of carbonate in the ancient barrier lacustrine sediments, the authors probe into the characteristic of the ancient climatic evolution from years 22*!kaBP to 10*!kaBP at Diexi in the upper Minjiang River.The result shows that the ancient climatic characteristic in this area can be divided into seven phases. The ancient climatic characteristic of the seven phases individually is cold dry (approximately 22*!kaBP～20*!kaBP), cold humid (approximately 20*!kaBP～17*!kaBP), hot dry (approximately 17*!kaBP～14*!kaBP), cold humid (approximately 14*!kaBP～13.5*!kaBP), hot somewhat dry (approximately 13.5*!kaBP～11*!kaBP),hot dry (approximately 11*!kaBP～10*!kaBP) and cold humid (approximately 10*!kaBP～9*!kaBP).
出处
《中国地质灾害与防治学报》
CSCD
2002年第2期91-96,共6页
The Chinese Journal of Geological Hazard and Control
关键词
岷江
碳酸盐
氧同位素
古气候
古堰塞湖
湖泊沉积物
碳同位素
carbon and oxygen isotopes of carbonate
ancient climate evolution
the ancient barrier lake
Diexi in the upper Minjiang River
