搜索结果: 1-7 共查到“国际动态 地层学与地史学”相关记录7条 . 查询时间(2.409 秒)
New study helps pinpoint when Earth's plate subduction began(图)
New study pinpoint when Earth plate subductiona
2020/12/18
A U.S. National Science Foundation-funded study by scientists at the Scripps Institution of Oceanography and the University of Chicago sheds light on a major question in Earth sciences:...
Shocked meteorites provide clues to Earth's lower mantle(图)
Shocked meteorites provide clues Earth lower mantle
2020/2/20
Deep below Earth's surface lies a thick rocky layer called the mantle, which makes up the majority of our planet's volume. While Earth's mantle is too deep for humans to observe directly, certain mete...
美国发现世界最古老森林遗迹
美国 世界 最古老 森林遗迹
2020/1/4
一个国际团队近日在美国《当代生物学》杂志网络版上报告说,他们在美国纽约州东南部发现了距今约3.86亿年的古森林化石遗迹,这是迄今发现的世界上最古老森林的遗迹。美国纽约州立大学宾厄姆顿分校和英国加的夫大学等机构研究人员组成的团队说,他们在纽约州东南部距今约3.86亿年的古生代泥盆纪中期地层中发现了这处古森林遗迹。距离此处40公里的一处森林遗迹此前被科学家认为是“最古老的”,而新发现的遗迹还要早300...
Study of northern Alaska could rewrite Arctic history(图)
northern Alaska Arctic history mineral wealth economic development
2019/10/30
Parts of Alaska's mountainous Brooks Range were likely transported there from Greenland and a stretch of the Canadian Arctic much farther to the east, according to a series of studies detailing more t...
瑞典下中奥陶统地层学综合研究取得进展(图)
瑞典 奥陶统 地层学综合研究
2017/8/30
近些年来,奥陶纪碳同位素地层学研究获得重要进展,已经识别出7次显著的碳同位素漂移事件,即为MDICE、GICE、HICE、Kope, Fairview、Waynesville和Whitewater等。其中,在中奥陶世达瑞威尔期,碳同位素值经历一次显著漂移事件,即达瑞威尔中期碳同位素漂移事件(MDICE)。与此同时,海洋生态系统历经一次重要的变革,记录了奥陶纪生物大辐射的第二次峰值。因此,对中奥陶统...
日本发现本国已知最古老地层
最古老地层
2008/9/22