Discovery of moganite in a lunar meteorite as a trace of H(2)O ice in the Moon's regolith.
Discovery of moganite in a lunar meteorite as a trace of H(2)O ice in the Moon's regolith.
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DOI：
10.1126/sciadv.aar4378
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发表时间：
2018-05
期刊：
影响因子：
13.6
通讯作者：
Kobayashi T
中科院分区：
文献类型：
--
作者：
Kayama M;Tomioka N;Ohtani E;Seto Y;Nagaoka H;Götze J;Miyake A;Ozawa S;Sekine T;Miyahara M;Tomeoka K;Matsumoto M;Shoda N;Hirao N;Kobayashi T
在月球陨石中发现的莫甘石表明了月球风化层中积累的H2O冰的可能性。莫甘石是一种单斜SiO2相，在月球陨石中发现。硅质微粒以纳米晶聚集体的形式出现，大部分是黑云母，偶尔也有柯石英和斯氏石英，出现在KREEP（高钾、稀土元素和磷）状的辉长岩-玄武质角砾岩NWA 2727中，尽管这些微粒在其他月球陨石中似乎不存在。我们将这些颗粒的起源解释如下：碱性水通过碳质球粒陨石碰撞输送到月球，在撞击引起的角砾岩化过程中捕获流体，在阳光照射的表面上在pH 9.5至10.5和363至399 K下从捕获的H2O中沉淀出moganite，以及陨石在8至22 GPa和>673 K的撞击下从月球发射。在地下，这种捕获的H2O可能仍然以大于0.6重量%的估计体积含量保持为冰。这表明，在Procellarum KREEP和南极艾特肯冰川内的宿主体的当地地点下可能存在丰富的可用水资源。
Discovery of moganite in a lunar meteorite indicates the possibility of H2O ice accumulated in the Moon’s regolith. Moganite, a monoclinic SiO2 phase, has been discovered in a lunar meteorite. Silica micrograins occur as nanocrystalline aggregates of mostly moganite and occasionally coesite and stishovite in the KREEP (high potassium, rare-earth element, and phosphorus)–like gabbroic-basaltic breccia NWA 2727, although these grains are seemingly absent in other lunar meteorites. We interpret the origin of these grains as follows: alkaline water delivery to the Moon via carbonaceous chondrite collisions, fluid capture during impact-induced brecciation, moganite precipitation from the captured H2O at pH 9.5 to 10.5 and 363 to 399 K on the sunlit surface, and meteorite launch from the Moon caused by an impact at 8 to 22 GPa and >673 K. On the subsurface, this captured H2O may still remain as ice at estimated bulk content of >0.6 weight %. This indicates the possibility of the presence of abundant available water resources underneath local sites of the host bodies within the Procellarum KREEP and South Pole Aitken terranes.
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影响因子：
56.9
作者：
Colaprete, Anthony;Schultz, Peter;Sollitt, Luke
通讯作者：
Sollitt, Luke
影响因子：
5
作者：
Lee, MR;Bland, PA
通讯作者：
Bland, PA
影响因子：
2.2
作者：
Fernandes, VA;Burgess, R;Turner, G
通讯作者：
Turner, G
影响因子：
18.3
作者：
Kubo, Tomoaki;Kimura, Makoto;Funakoshi, Ken-ichi
通讯作者：
Funakoshi, Ken-ichi
影响因子：
2.1
作者：
Léger, JM;Haines, J;Chateau, C
通讯作者：
Chateau, C