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IAB隕石

IAB隕石
— 隕石群 —
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鵝湖隕石是一顆sLL子群(低鋁、低鎳)的IAB隕石。
類型
結構分類 六面體隕鐵,由細微到粗糙的八面體隕鐵,常常有無紋隕鐵
群組 原始無球粒隕石
子群
  • sLL
  • sLM(原劃分為 IIIC)
  • sLH(原劃分為 IIID)
  • sHL
  • sHH(包含 Gay Gulch trio)
  • Udei Station 小群
  • Pitts 小群
  • Algarrabo duo
  • Mundrabilla duo
  • Britstown duo
  • NWA 468 duo
  • Twin City duo
  • 與 IAB 相關的隕鐵
母體 IAB
成分 鐵隕石錐紋石鎳紋石)和矽酸鹽雜質

IAB隕石鐵隕石的一種,依據其總體的組成和一些夾雜著矽酸鹽原始無球粒隕石,顯示對文諾納隕石球粒隕石的關係極為密切[1]

說明

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IAB隕石是夾雜著矽酸鹽的鐵隕石錐紋石鎳紋石)。它們的結構可以是六面體隕鐵、由細微到粗糙的八面體隕鐵,甚至是無紋隕鐵[2]它們大多數是八面體隕鐵和中等到粗糙的鎳紋石鱗片與生成中的魏德曼花紋[1]

矽酸鹽雜質由低鈣輝石、高鈣輝石橄欖石斜長石隕硫鐵石墨,不同的磷酸鹽、鐵隕石和微量的隕輝鉻鐵礦和鉻鐵[2]。 這種成分和文諾納隕石非常相似,因此有人認為這兩個群組有著共同來源的母體。它們也與IIICD隕石相似[3],但並不是很明確,如果它們有部分來自相同的母體[1]

分類

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IAB群是由較舊的IA和IB群組合創建的,有些人還是習稱之為IAB複合群[3]

IAB群有許多的子群[3]

  • IAB 主群
  • sLL子群
  • sLM子群(原本的IIIC)
  • sLH子群(原本的IIID)
  • sHL子群
  • sHH子群(包括 Gay Gulch trio)
  • Udei 站小群
  • 匹茲小群
  • Algarrabo duo
  • Mundrabilla duo
  • Britstown duo
  • NWA 468 duo
  • Twin City duo
  • 與 IAB 相關單獨隕鐵
  • IAB 相關?

母體

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大多數的科學家認為文諾納隕石和IAB有著共同的母體,但還有有了解IIICD隕石是否也屬於這一個群體[1]

值得注意的標本

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相關條目

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參考資料

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  1. ^ 1.0 1.1 1.2 1.3 Binze, D.S. Lauretta; Jr., H.Y. McSween; foreword by Richard P.; T. J. McCoy; A. N. Krot. Systematics and Evaluation of Meteorite Classification. Meteorites and the early solar system II (PDF). Tucson: University of Arizona Press. 2006: 19–52,942 [17 November 2016]. ISBN 978-0816525621. (原始内容 (PDF)存档于2017-08-08). 
  2. ^ 2.0 2.1 Benedix, G. K.; T. J. McCoy, K. Keil, S. G. Love. ) A petrologic study of the IAB iron meteorites: Constraints on the formation of the IAB-winonaite parent body (PDF). Meteoritics and Planetary Science. 2000, 35: 1127–1141 [17 December 2012]. (原始内容 (PDF)存档于2012-03-01). 
  3. ^ 3.0 3.1 3.2 Wasson, J.T; Kallemeyn, G.W. the IAB iron-meteorite complex: A group, five subgroups, numerous grouplets, closely related, mainly formed by crystal segregation in rapidly cooling melts. Geochimica et Cosmochimica Acta. 30 June 2002, 66 (13): 2445–2473. doi:10.1016/S0016-7037(02)00848-7. 
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IAB隕石
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