The House GOP is asking the administration to investigate whether China-linked entities are fueling resistance to artificial...
Science
After centuries of overharvesting and environmental degradation reduced the world’s oyster reefs by 85%, restoration is bringing...
Editors’ Vox is a blog from AGU’s Publications Department. Mesoscale and submesoscale ocean processes influence ocean circulation,...
Industry executives said the loss of oil through the Strait of Hormuz is draining petroleum inventories to...
The National Center for Atmospheric Research is the latest example of how the Trump administration’s efforts to...
Research & Developments is a blog for brief updates that provide context for the flurry of news regarding...
Source: Geochemistry, Geophysics, Geosystems This is an authorized translation of an Eos article. 本文是Eos文章的授权翻译。 大约 6 亿年前，各大洲在地球上漂移，尚未最终定格在现在的位置。在埃迪卡拉纪时期，各大洲的位置对于科学家来说一直难以确定。地球的磁场似乎表现得异常不稳定，而利用标准方法根据磁场记录来计算大陆位置的做法却得出了一些难以置信的结果。尤其是，科学家们对一块名为波罗的大陆的古老大陆的位置存在争议，这块大陆如今是欧洲的一部分。 为了探究这一问题，Xue等人前往挪威埃格尔松德，采集了波罗的大陆地壳被撕裂、岩浆从下方涌出时形成的岩石样本。随着这些岩浆冷却凝固，它们记录了地球磁场的瞬时变化，并在此过程中存储了有关波罗的大陆位置的信息。 对这些样本的研究结果揭示了远比科学家们最初设想的更为复杂的古代岩石图景。这些岩石中至少包含了六种不同的磁信号，构成了一幅复杂的混合图景。其中一些信号似乎是在更现代的地质过程改变原始岩石时形成的。埃迪卡拉纪时期可能保存了三种不同的信号，其中两种与将波罗的板块置于赤道附近的最合理的埃迪卡拉纪信号相悖。这些相互矛盾的信号进一步支持了地球磁场在当时异常活动的观点，使原本就扑朔迷离的图景更加复杂。 基于新的研究结果，研究人员将埃迪卡拉纪时期埃格尔松德古地磁极的位置确定在北纬20.8°、东经89.0°——这与之前的研究结果有所不同——并提出波罗的板块当时位于赤道附近，毗邻古老的劳伦古陆，但相对于之前的重建结果，其位置略有顺时针旋转。这项研究表明，保存在古代岩石中的磁信号极其复杂，并凸显了将这些记录分解成各个组成部分的重要性。研究人员认为，这样做可以为埃迪卡拉纪时期地球磁场的神秘行为提供新的线索。(Geochemistry,...
“I’ve just always felt like art and science are flip sides of the same coin.” Scientists use...
Editors’ Vox is a blog from AGU’s Publications Department. As the AGU Books Program celebrates its 70th...
Labor unions are using their political power — and a jobs message — to influence state efforts...
As Colorado River water levels reach disastrous lows, the administration looks to draw cash from the 2022...
The volcano Ol Doinyo Lengai in Tanzania is unique on Earth: Its lava is rich in carbon...
Source: Geophysical Research Letters Atmospheric rivers act like “rivers in the sky,” shuttling intense bands of warm,...
Editors’ Highlights are summaries of recent papers by AGU’s journal editors. Source: Journal of Geophysical Research: Solid...
Research & Developments is a blog for brief updates that provide context for the flurry of news regarding...
Research & Developments is a blog for brief updates that provide context for the flurry of news regarding...
Editors’ Highlights are summaries of recent papers by AGU’s journal editors. Source: Water Resources Research Recent studies...
Source: AGU Advances The Indian monsoon has shifted over the past quarter century. Northwest India now receives...
Off Track, On Purpose An Off-Road Itinerary Discovering Venus on Iceland What’s Below the Great Salt Lake?...
Editors’ Vox is a blog from AGU’s Publications Department. The AGU Books Editorial Board comprises researchers spanning...
