Antarctic micrometeorite composed of CP and CS IDP‐like material: A micro‐breccia originated from a partially ice‐melted comet‐like small body
Antarctic micrometeorite composed of CP and CS IDP‐like material: A micro‐breccia originated from a partially ice‐melted comet‐like small body
复制标题
由 CP 和 CS IDP 类物质组成的南极微陨石：源自部分冰融化的彗星状小天体的微角砾岩
DOI：
10.1111/maps.13919
复制
发表时间：
2022
影响因子：
2.2
通讯作者：
Takahashi Yoshio
中科院分区：
文献类型：
--
作者：
Noguchi Takaaki;Matsumoto Rikako;Yabuta Hikaru;Kobayashi Hanae;Miyake Akira;Naraoka Hiroshi;Okazaki Ryuji;Imae Naoya;Yamaguchi Akira;Kilcoyne A. L. David;Takeichi Yasuo;Takahashi Yoshio
小行星和彗星被认为分别形成于太阳系的内部和外部。平流层中的球粒多孔和光滑的行星际尘埃颗粒（分别为CP IDP和CS IDP）分别被认为是来自彗星和水合小行星的尘埃颗粒。在这里，我们描述了一个南极微陨石（AMM）的CP和CS IDPs的岩性组成。除了经历严重水蚀变的CS IDP样致密岩性外，CP IDP样多孔岩性显示出非常弱的水蚀变证据。多孔岩性中有机质的结构从CP IDPs到富含芳烃的有机质。相比之下，致密岩性中有机质的结构是均匀的，这与较高程度的含水蚀变一致。它的结构更类似于CP IDPs和Wild 2样品，而不是陨石不溶性有机质，表明致密岩性是由多孔岩性形成的。一些CP IDP与彗星尘埃流有关，例如来自26 P/Grigg-Skenerup的尘埃流。此外，这种AMM的存在表明CP IDP及其等效AMM的另一来源。这个AMM的矿物学和有机化学表明，它的母体是由与彗星相同的结构单元组成的，后来经历了不完全的水蚀变。AMM可能形成为风化层中的微角砾岩，由CP IDP样地壳和水合内部的物质组成。
Asteroids and comets are thought to form in the inner and outer solar systems, respectively. Chondritic porous and smooth interplanetary dust particles (CP IDPs and CS IDPs, respectively) in the stratosphere are regarded as dust grains from comets and hydrated asteroids, respectively. Here, we describe an Antarctic micrometeorite (AMM) composed of lithologies of both CP and CS IDPs. In addition to the CS IDP‐like compact lithology that experienced severe aqueous alteration, the CP IDP‐like porous lithology shows evidence of very weak aqueous alteration. The structure of the organic matter in the porous lithology varies from that in the CP IDPs to aromatic‐rich organic matter. In contrast, the structure of the organic matter in the compact lithology is homogenous, which is consistent with higher degrees of aqueous alteration. Its structure is more similar to that of CP IDPs and Wild 2 samples than that of meteoritic insoluble organic matter, suggesting that the compact lithology formed from the porous lithology. Some CP IDPs are related to cometary dust streams, such as those originating from 26P/Grigg‐Skjellerup. In addition, the presence of this AMM indicates an additional origin of the CP IDPs and their equivalent AMMs. The mineralogy and organic chemistry of this AMM suggest that its parent body was composed of the same building blocks as those of the comets, and later experienced incomplete aqueous alteration. The AMM probably formed as microbreccia in the regolith layer composed of materials from a CP IDP‐like crust and a hydrated interior.
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DOI：
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发表时间：
2012
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发表时间：
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