File:North america basement rocks.png

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North_america_basement_rocks.png ‎（484 × 429像素，文件大小：31 KB，MIME类型：image/png）

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描述

North American cratons and basement rocks.

As radiometric ages were determined for the shield-like rocks on the continents which were either exposed at the surface, underlay the flat rocks, or were within the interior of the mountain belts, patterns of age intervals were determined. These old rocks have been called the "basement". This has been interpreted to mean that the continents had somehow grown by development of rock assemblages with these characteristic age parameters. The expanding continental nuclei are part of the "craton" which consist of both exposed and buried basement rocks.

日期

2015年3月5日

来源

http://rst.gsfc.nasa.gov/Sect2/14strprv.jpg or http://instruct.uwo.ca/earth-sci/300b-001/14strprv.gif English Wikipedia, original upload 22 April 2005 by Berkut Originally uploaded by User:SEWilco as Image:North america basement rocks.jpg. Replaced when this better version found.

作者

USGS

授权
(二次使用本文件)

本图片在美国属于公有领域，因为其只包含最初来自美国内政部下属机构美国地质调查局的材料。更多信息请参见USGS官方版权方针。

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derivative works

此文件衍生的作品： North america and scandinavia basement rocks.png

文件历史

点击某个日期/时间查看对应时刻的文件。

	日期/时间	大小	用户	备注
当前	2019年10月11日 (五) 22:48	484 × 429（31 KB）	Ciaurlec	Reverted to version as of 21:20, 29 September 2019 (UTC)
	2019年9月30日 (一) 13:52	484 × 429（37 KB）	Ciaurlec	Reverted to version as of 19:38, 29 September 2019 (UTC)
	2019年9月29日 (日) 21:20	484 × 429（31 KB）	Ciaurlec	Major colour change to make conform to Geologic time scale where possible. Used also some other graphic changes as in File:North america and scandinavia basement rocks.png 2nd upload
	2019年9月29日 (日) 19:38	484 × 429（37 KB）	Ciaurlec	Major colour change to make conform to Geologic time scale where possible. Used also some other graphic changes as in File:North america and scandinavia basement rocks.png
	2005年9月16日 (五) 15:47	484 × 429（13 KB）	Saperaud~commonswiki	North American cratons and basement rocks. As radiometric ages were determined for the shield-like rocks on the continents which were either exposed at the surface, underlay the flat rocks, or were within the interior of the mountain belts, patte