西藏现被掩藏古老峡谷 部分地段深达数千英尺
文章来源: 印度教徒报 于
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黄昏下,雅鲁藏布江上的摆渡人操船渡水(10月28日摄)。
11月23日报道 外媒称,一条位于西藏南部雅鲁藏布江水域、被掩埋的古老而深邃的峡谷近日被发现。
据《印度教徒报》网站11月22日报道,美国加州理工学院与中国地震局联合组建的一支科研队伍说,这个古峡谷—部分地段深达数千英尺(1英尺=0.3048米)—实际上否定了一种用来解释喜马拉雅山脉地区一系列庞大而风景如画的峡谷为什么如此陡峭的流行模式。
加州理工学院地质学教授让-菲利普·阿武阿克说:“我第一次看到数据时惊叹不已。看到这条河曾经非常深地切入青藏高原,我非常惊讶,因为现在可不是这个样子。这是一个重大发现。”
报道称,去年,土木工程师沿着雅鲁藏布江在5个地方对谷床进行下钻,收集到一些核心数据。不久后,加州理工学院的一名毕业生与阿武阿克等人分享了这些核心数据。经过进一步分析,他们发现,在几个地方有沉积性的砾岩、圆砾石和较大石块—这与流动的河水有关。而且其分布一直到800米的地下。这表明,这条河曾经深度切入这个高原。
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