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| 1 | 中国北方埃迪卡拉纪冰碛岩及冰川作用显示文摘中国北方从东到西绵延3000 km范围上的华北克拉通、塔里木克拉通及其中间微地块上都保存有埃迪卡拉纪冰川沉积记录,但有关它的年代学、冰川规模、古地理重建和大地构造背景等存有争论。本文基于中国北方埃迪卡拉纪冰碛岩空间分布、地层与沉积层序,沉积环境与沉积相等,结合以往国内外文献,系统分析了埃迪卡拉纪冰川上述有关问题。研究揭示,埃迪卡拉纪时期,国内外应存在年轻于(Gaskiers)580 Ma的冰期;中国北方埃迪卡拉纪冰川时限约562.5~551 Ma,堆积了冰下、冰缘和冰前沉积相(物),构成垂向上(由下至上)从冰下至冰前与海相冰碛物沉积层序,符合大陆冰川(盖)沉积响应样式;此外,国内外埃迪卡拉纪冰碛岩及冰川剥蚀地貌均十分发育;部分冰碛岩之上还可见盖帽白云岩,并呈现与成冰纪盖帽白云岩类似的沉积构造,但彼此碳同位素剖面却不尽相同;本研究推测,埃迪卡拉纪时期,原特提斯洋及周缘大陆(群)可能普遍存在至少是洲际性大陆冰盖,甚至是全球性的冰期。研究认为,埃迪卡拉纪时期的亚洲陆块群应与冈瓦纳大陆缺乏构造亲缘性的若干重要证据。本文研究结果在埃迪卡拉纪大陆及其古地理重建和大地构造背景恢复方面具有重要科学意义。 | 柳永清 旷红伟 陈骁帅 王玉冲 江小均 许欢 祁柯宁 彭楠 | 2023 | 地质学报2023，97，12： | 2 |
| 2 | Plate Tectonics:The Stabilizer of Earth’s Habitability显示文摘Earth is the only planet known to be habitable,and is also unique with its liquid water,and the operation of plate tectonics.The geological record shows that the habitability of our planet can rapidly recover from major disasters or catastrophes,even those that cause mass extinctions.We suggest that plate tectonics,which acts as a link between the shallow and deep,is pivotal for the formation,evolution,and long-term stability of the hydrosphere,atmosphere,lithosphere,and thus life.Plate tectonics links the surface environment with the deep interior of high viscosity,low Reynolds number,low entropy,and low chaos,able to produce a strong healing effect to neutralize catastrophic events.It can transfer the bio-essential elements from the deep interior to the near-surface environment and can recycle toxic elements to the deep.This unique planetary energy and material transfer process of Earth is a continuous,slow-release,and bidirectional cycle,where a change in the surface is slowly buffered by a reaction from the deep,shaping a long-term and stable habitable environment.Therefore,it is considered that plate tectonics is the basic condition for the long-term stable evolution of the Earth’s biosphere and the stabilizer of the Earth’s habitability. | Zhensheng Wang Junfeng Zhang Keqing Zong Timothy M.Kusky Yanxin Wang | 2023 | Journal of Earth Science2023，34，6： | 0 |
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