File:North america basement rocks.png

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North_america_basement_rocks.png ‎（484 × 429 像素，檔案大小：31 KB，MIME 類型：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

來源

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

授權許可
(重用此檔案)

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derivative works

Derivative works of this file: North america and scandinavia basement rocks.png

檔案歷史

點選日期/時間以檢視該時間的檔案版本。

	日期/時間	尺寸	使用者	備⁠註
目前	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