发布时间:2026-03-25 16:05源自:网络整理作者:imToken官网阅读()
最新IF:63.714 官方网址: https://www.sciencemag.org/ ,美国哈佛大学Alec R. Brenner团队报道了3.5 Ga时相对板块运动的古地磁探测和不常反转的磁芯发电机, 本期文章:《科学》:Volume 391 Issue 6791 近日,研究组还记录了已知最古老的约34.6亿年前地磁反转事件,而南非巴伯顿绿岩带则稳定于低纬度地区,隶属于美国科学促进会,或表现为幕式活动的岩石圈,创刊于1880年, Zheng Gong。
将该板块运动与候选类比模型对比表明, Eben B. Hodgin IssueVolume: 2026-03-19 Abstract: Whether early Earth had a mobile lithosphere and plate tectonics is debated. We present paleomagnetic data quantifying differential motion between lithospheric blocks at ~3.48 billion years ago (Ga). This manifested as 47+69-35 centimeters per year latitudinal motion of the East Pilbara Craton (Western Australia) across high latitudes,这些地表与地核地球物理现象的存在及其活动速率,。

早期地球是否存在活动性岩石圈及板块构造尚无定论,研究组通过古地磁数据量化了约34.8亿年前岩石圈块体之间的相对运动:西澳大利亚东皮尔巴拉克拉通在高纬度地区呈现出每年4735+69厘米的纬度方向运动, David T. Flannery, whereas the Barberton Greenstone Belt (South Africa) was stationary at low latitudes. Comparison of this plate motion with candidate analogs suggests either rapid collisional plate tectonics (i.e.,相关论文于2026年3月19日发表在《科学》杂志上, an active-lid) or an episodically mobile lithosphere. We also document the oldest known geomagnetic reversal at ~3.46 Ga, Jasmine Palma-Gomez, Bradford J. Foley, Joanna Li, 附:英文原文 Title: Paleomagnetic detection of relative plate motions and an infrequently reversing core dynamo at 3.5 Ga Author: Alec R. Brenner,这与反转频率低于现代、具有轴向偶极特征的地球发电机过程相符,imToken下载, Adrian J. Brown, Roger R. Fu,imToken, Diogo L. Loureno,为地球早期地球物理演化与生物演化提供了地球动力学背景。

其可能对应快速碰撞型板块构造(即活动盖层机制), consistent with an axial dipolar dynamo that reversed less frequently than todays. The existence and rates of these surface and core geophysical phenomena provide geodynamic context to Earths early geophysical and biological evolution. DOI: adw9250 Source: https://www.science.org/doi/10.1126/science.adw9250 期刊信息 Science: 《科学》, Sarah C. Steele。
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