For faster navigation, this Iframe is preloading the Wikiwand page for HED隕石.

HED隕石

詹斯鎮的古銅無球隕石

HED 隕石是三種無球粒隕石的總稱,它們分別是:

它們都被認為是來自小行星灶神星的地殼,期間的差異只在於來自不同地質歷史的母岩石。由放射線同位素測定這些隕石結晶體的年齡都在44.3和45.5億年之間。

在比較上,它們是非常普通的類型,佔所有發現隕石的5%,並佔無粒隕石的60%。[1]

她們可能是經由如下的途徑由灶神星來到地球 [2]

  1. 灶神星被撞擊拋射出碎片,產生直徑10公里或更小的V-型小行星碎片。無論拋出的是大的小行星,或成為小的碎片,其中一些小的小行星組成了灶神星族,其他的則進一步的散射至各處。[3] 這些事件被認為發生至今不超過10億年,[4]其中有一次巨大的撞擊,在南半球的巨大隕石坑是這個撞擊點位置的最佳證據。而且需要多次的撞擊,拋射出的岩石才能達到我們已知的V-型小行星數量。
  2. 有些小行星的碎片經歷漫長的旅程進入3:1的柯克伍德空隙。由於木星強大的攝動,這是一個不穩定的區間,在這兒的小行星大約經過100萬年的時間就會被拋出,遠離到不同的軌道上。有些受到攝動後進入到接近地球的軌道,形成小的V-型近地小行星,例如(3551) Verenia、(3908) Nyx、和(4055)麥哲倫
  3. 然後發生在這些接近地球天體上的較小型撞擊,將她們擊碎成隕石體大小的石塊,其中一些在稍後抵達地球。根據宇宙射線暴露的測量,認為多數的HED隕石來自幾次不同型態的撞擊事件,並且在太空中經歷600~7,300萬年的時間才撞擊到地球。[5]

參考

[编辑]
  1. ^ Lindstrom, Marilyn M.; Score, Roberta. Populations, Pairing and Rare Meteorites in the U.S. Antarctic Meteorite Collection。NASA Johnson Space Center.
  2. ^ Drake, Michael J. The eucrite/Vesta story页面存档备份,存于互联网档案馆). Meteoritics and Planetary Science, Vol. 36, p. 501 (2001).
  3. ^ Binzel, R. P.; Xu, S. Chips off of asteroid 4 Vesta: Evidence for the parent body of basaltic achondrite meteorites. Science, Vol. 260, 186 (1993).
  4. ^ Binzel, R.P.; et al. Geologic Mapping of Vesta from 1994 Hubble Space Telescope Images. Icarus, Vol. 128, p. 95 (1997).
  5. ^ Eugster, O.; Michel, Th. Common asteroid break-up events of eucrites, diogenites, and howardites, and cosmic-ray production rates for noble gases in achondrites Geochemica et Cosmochimica Acta, Vol. 59, p. 177 (1995).
{{bottomLinkPreText}} {{bottomLinkText}}
HED隕石
Listen to this article

This browser is not supported by Wikiwand :(
Wikiwand requires a browser with modern capabilities in order to provide you with the best reading experience.
Please download and use one of the following browsers:

This article was just edited, click to reload
This article has been deleted on Wikipedia (Why?)

Back to homepage

Please click Add in the dialog above
Please click Allow in the top-left corner,
then click Install Now in the dialog
Please click Open in the download dialog,
then click Install
Please click the "Downloads" icon in the Safari toolbar, open the first download in the list,
then click Install
{{::$root.activation.text}}

Install Wikiwand

Install on Chrome Install on Firefox
Don't forget to rate us

Tell your friends about Wikiwand!

Gmail Facebook Twitter Link

Enjoying Wikiwand?

Tell your friends and spread the love:
Share on Gmail Share on Facebook Share on Twitter Share on Buffer

Our magic isn't perfect

You can help our automatic cover photo selection by reporting an unsuitable photo.

This photo is visually disturbing This photo is not a good choice

Thank you for helping!


Your input will affect cover photo selection, along with input from other users.

X

Get ready for Wikiwand 2.0 🎉! the new version arrives on September 1st! Don't want to wait?