陕西蓝田段家坡黄土剖面地球化学元素特征及古气候效应分析
Characteristics of Geochemical Element and Paleoclimate Effect——A Case Studying of Duanjiapo Section During Late Neogene and Quaternary, in Lantian, Shaanxi
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摘要: 地球化学元素在剖面上的变化能够反映当时沉积时期的古气候环境。通过对陕西蓝田段家坡剖面的24件样品进行系统分析,段家坡剖面中各元素含量存在一个明显的变化点。0.57~0.37 Ma的元素含量波动较大,0.37 Ma以来的各元素含量变化较小,反映出不同时期的古气候变化趋势不同。0.57~0.37 Ma的黄土剖面总体上反映了冷暖间或的古气候特征,0.37~0.13 Ma的黄土剖面总体上反映了温暖湿润的古气候环境,0.13 Ma以来至马兰黄土沉积结束时期(10ka BP)的气候变得较为干冷。这一变化规律与深海氧同位素、古植被、古气候的变化规律具有较好的一致性,并且符合米兰科维奇旋回的变化规律。Abstract: The variation of geochemical element in section can reflect the paleoclimate circum stance in the course of sedimentary.Through systematically analyzing 30 pieces of samples collected from Duan jiapo section,we conclude that there is an obvious catastrophe point for every kinds of elements.Content of element has a great change from 0.57Ma to 0.37MaB.P,but keep unchanged around 0.37Ma. Paleoclimate have changed from the cold-warm fluctuation and total warmand moist to dry-cold climate from 0.57Ma to 0.37Ma B.P and from 0.37 Ma to 0.13Ma B.P and 0.13 Ma to 0.01Ma B.P,the change suggests that the variation trend of paleoclimate is from one geologicera to another. The result from element is not only identical to those from deep sea oxygen isotope,ancient vegetation,and paleoclimate but also consistent with MILAN KOV ITCH period.
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Key words:
- Lantian /
- Shaanxi /
- Duanjiapo loess section /
- geochemical element
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