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羌塘地块

羌塘地块的位置。班公湖-怒江缝合带将其与拉萨地体分开,后者与南侧的喜马拉雅山脉印度河-雅鲁藏布江缝合带为界。
喜马拉雅山脉的大地构造图,修正自Le Fort & Cronin (1988)。红色是跨喜马拉雅带。绿色是印度河-雅鲁藏布江缝合带,其北部是拉萨地块,再向北是班公湖-怒江缝合带和羌塘地块。

羌塘地块青藏高原3个主要东西向地体之一。

金沙江缝合带反映三叠纪时羌塘地块北缘向南,潜没到松潘-甘孜地块下方。在侏罗纪,拉萨地体与羌塘地块的南缘沿班公湖缝合带熔合。[1]:Geologic setting, p. 475这一缝合带也是特提斯洋的闭合线,使羌塘地块变成了巨大的背斜[2]:Geologic setting, pp. 32–33

羌塘地块目前海拔约5km,不过其抬升的具体时间存在争议,从上新世-更新世(3–5 Ma)到始新世(35 Ma)的估计都有。后者的估计基于高原第一次遭受剥蚀作用的时间。[2]:Introduction, pp. 31–32

另见

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羌塘地块相关(由南向北)

  • 班公湖-怒江缝合带高压变质地体

参考

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羌塘地块
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