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北美大陆底部岩石在滴落

2025-04-07 15:32 by 方舟

德州奥斯丁的地球科学家报告,北美大陆底部岩石块正在滴落,地幔中下沉的板块残余被认为造成这一现象的原因。这种现象被称为“克拉通变薄”。克拉通(Cratons)又被称为稳定地块或安定地块,是大陆地壳上的古老而稳定的部分,于最近至少 5 亿年内的大陆和超大陆的会聚和分裂过程中几乎没有发生变化。但克拉通有时也会发生变化,影响其稳定性或者移除整个岩层。例如中国华北地区的克拉通地块在数百万年前失去了其最深处的根层。北美的岩石块滴落现象集中在美国中西部,研究人员表示不必要担心大陆会被掏空或滴落会改变地貌,因为整个过程是非常缓慢的,而且随着板块残余沉入地幔深处,对克拉通的影响会减弱,滴落现象最终将会停止。

The University of Texas at Austin:North America is Dripping from Below, Geoscientists Discover

#USA



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北美大陆底部岩石在滴落

2025-04-07 15:32 by 方舟

德州奥斯丁的地球科学家报告,北美大陆底部岩石块正在滴落,地幔中下沉的板块残余被认为造成这一现象的原因。这种现象被称为“克拉通变薄”。克拉通(Cratons)又被称为稳定地块或安定地块,是大陆地壳上的古老而稳定的部分,于最近至少 5 亿年内的大陆和超大陆的会聚和分裂过程中几乎没有发生变化。但克拉通有时也会发生变化,影响其稳定性或者移除整个岩层。例如中国华北地区的克拉通地块在数百万年前失去了其最深处的根层。北美的岩石块滴落现象集中在美国中西部,研究人员表示不必要担心大陆会被掏空或滴落会改变地貌,因为整个过程是非常缓慢的,而且随着板块残余沉入地幔深处,对克拉通的影响会减弱,滴落现象最终将会停止。

The University of Texas at Austin:North America is Dripping from Below, Geoscientists Discover

#USA

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