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[地球纵横]科学家宣称在新西兰周围发现第八大洲

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更多 发布于:2017-02-17 22:39
参考消息网2月17日报道 英媒称,科学家声表示,在新西兰周围发现了一块名为"西兰洲"的新大陆,可能将成为世界第八大洲。
据英国广播公司网站2月17日报道,科研人员说,这个位于太平洋西南部的大洲的94%面积都浸没在海水中,只有几个地区露出海面,包括其最高峰就在大家熟知的新西兰。
提出新大陆说法的这些科学家在《美国地质学会期刊》发表了他们的研究报告,解释这个面积将近500万平方公里的、世界上面积最小的大陆西兰洲的情况。它的面积大约相当于比邻的澳大利亚的2/3。
这一大洲有三块地区露出海面:新西兰的北岛、南岛和新喀里多尼亚。
上述报告指出,西兰洲具备了地球另外七个洲的主要特征,包括: 比周围地区更高的海拔; 独特的地理地质; 区域划分明确; 具有比普通海洋地壳更厚的地块等。
新西兰的地质学家尼克·莫蒂默尔是上述报告的主要作者。他介绍说,科学家们已经考察研究"西兰洲"长达20年了。
他说:"一个洲可能淹没在水里,但它是一个大陆板块。"因此这一研究有益于探索大陆板块的延续和断裂问题。
我们的天文地理知识随着技术进步在不断修改。几年前,科学界达成共识,将冥王星从太阳系九大行星中去掉,在中学里教授了几十年的地理课本都改写了。
目前世界上没有认证大陆的正式科学机构。所以,要科学界认可世界有八大洲而不是七大洲还可能需要很久。如果承认这一新大陆,那么我们的地理课本又要改写了。

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[gaobo18于2017-02-18 01:15编辑了帖子]
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发布于:2017-02-18 01:12
新西兰和澳大利亚的地质学家发现地球第八大洲
俄罗斯卫星通讯社莫斯科2月17日电 据Nature News杂志报道,新西兰和澳大利亚的地质学家发现了地球上的第八大洲。新大洲被命名为西兰,位于太平洋西南部洋底。
新大洲的面积约为500万平方公里。该大洲94%的面积淹没在水下,露出水面的有新喀里多尼亚岛、新西兰北岛和南岛。
根据学者们的评估,西兰约在1亿年前开始脱离远古超级大陆冈瓦纳。这造成地壳变形,导致大部大陆地沉入水下。地质学家通过卫星观测证实了自己的推论。
发现者们提议将大洲从七个(欧洲、亚洲、非洲、澳洲、南极洲、北美洲、南美洲)增加到八个,将西兰加入其中。

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发布于:2017-04-19 21:06
法新社报道:N. Zealand part of sunken 'lost continent': scientists
New Zealand sits atop a previously unknown continent -- mostly submerged beneath the South Pacific -- that should be recognised with the name Zealandia, scientists said Friday.
Researchers said Zealandia was a distinct geological entity and met all the criteria applied to Earth's seven other continents -- elevation above the surrounding area, distinctive geology, a well-defined area and a crust much thicker than that found on the ocean floor.
In a paper published in the Geological Society of America's Journal, GSA Today, they said Zealandia measured five million square kilometre (1.9 million square miles) and was 94 percent underwater.
The paper's authors said it had only three major landmasses, New Zealand's North and South Islands to the south, and New Caledonia to the north.
The scientists, mostly from the official New Zealand research body GNS Science, said Zealandia was once part of the Gondwana super-continent but broke away about 100 million years ago.
"The scientific value of classifying Zealandia as a continent is much more than just an extra name on a list," they wrote.
"That a continent can be so submerged yet unfragmented makes it (useful)... in exploring the cohesion and breakup of continental crust."
Lead author Nick Mortimer said scientists have been gathering data to make the case for Zealandia for more than 20 years.
But their efforts had been frustrated because most of it was hidden beneath the waves.
"If we could pull the plug on the oceans, it would be clear to everybody that we have mountain chains and a big, high-standing continent," he told TVNZ.
While there is no scientific body that formally recognises continents, Mortimer said he wanted Zealandia to become an accepted part of how the Earth is viewed.
"What we hope is that Zealandia will appear on world maps, in schools, everywhere," he said.
"I think the revelation of a new continent is pretty exciting."

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