金沙江縫合帶反映三疊紀時羌塘地塊北緣向南,潛沒到松潘-甘孜地塊下方。在侏羅紀,拉薩地體與羌塘地塊的南緣沿班公湖縫合帶熔合。[1]:Geologic setting, p. 475這一縫合帶也是特提斯洋的閉合線,使羌塘地塊變成了巨大的背斜。[2]:Geologic setting, pp. 32–33
羌塘地塊目前海拔約5km,不過其抬升的具體時間存在爭議,從上新世-更新世(3–5 Ma)到始新世(35 Ma)的估計都有。後者的估計基於高原第一次遭受剝蝕作用的時間。[2]:Introduction, pp. 31–32
另見
羌塘地塊相關(由南向北)
- 喜馬拉雅地質
- 印度河-雅魯藏布江縫合帶
- 班公湖-怒江縫合帶高壓變質地體
參考
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