2024年12月21日 · Northwest Africa 8656 (NWA 8656) Northwest Africa. Purchased: 2014 Jan. Classification: Martian meteorite (Shergottite) History: Purchased by Darryl Pitt in January and February 2014 from a group of dealers in Mauritania. Physical characteristics: Exterior mostly wind-ablated with a few remnant patches of dull black fusion crust. Cut interior ...

west Africa 8656, basalt shergottite, is the sample of this study.The chemistry composition reveals the origin of magma and crystallization history, similar to other rich basaltic shergottite [1]. Methods: The characterization of primary petrogra-phy and mineralogy was finished by …

2022年3月1日 · The Sm-Nd isotopic data of the phosphates in meteorites NWA 10153, Zagami, NWA 8656, and NWA 10414 are presented in Fig. 6 and Table S6. Only two in situ Sm-Nd isotopic data points were obtained in the present study for apatite in nakhlite NWA 10153 (Table S6) and thus could not form an isochron by themselves.

The delivery mechanism to Earth was an asteroid impact on Mars that ejected material off the Martian surface into an Earth-intersecting orbit. This is the 8,656th distinct meteorite to be recovered and classified by scientists after having been found in the Northwest Africa (NWA) region of the Sahara Desert.

The oxygen fugacity of NWA 8656 (QFM –0.9±0.5) suggests an oxidized condition at the late-stage crystallization process, and the CI-normalized REE patterns of different minerals show enrichment in LREE, compared to that of depleted shergottites.

2018年10月16日 · The crystallization of Fe-rich pyroxenes and the existence of different symplectites indicate that NWA 8656 underwent eruption. The oxygen fugacity of NWA 8656 (QFM –0.9±0.5) suggests an oxidized condition at the late-stage crystallization process, and the CI-normalized REE patterns of different minerals show enrichment in LREE, compared to ...

本文以火星陨石nwa 8656为研究对象,利用扫描电镜、电子探针和激光剥蚀电感耦合等离子体质谱仪(la-icp-ms)等分析技术,对样品进行岩相学和单矿物主微量地球化学等方面分析,来研究探讨火星陨石nwa 8656的岩浆演化过程,以及富集型辉玻无球粒陨石源区的成因。

2020年12月1日 · Secondary-Ion Mass Spectrometry (SIMS) was used to investigate four sulfur isotopes (32 S, 33 S, 34 S and 36 S) in individual sulfide mineral grains in NWA 8171 (polymict breccia), NWA 7320, NWA 7397, NWA 8656, and NWA 8716, allowing the textural relationship between sulfides and the associated silicates and oxides to be retained. The analysis ...

In this paper, we present mineralogical and geochemical data on four new Martian meteorites (all shergottites), all discovered in Northwest Africa (NWA) in the past 5 yr: NWA 10441, NWA 10818, NWA 11043, and NWA 12335 (Bouvier, Gattacceca, Agee, et al., 2017; Bouvier, Gattacceca, Grossman, et al., 2017; Gattacceca et al., 2019, 2020). We ...

2017年11月16日 · Northwest Africa (NWA) 8657 is an incompatible trace element-enriched, low-Al basaltic shergottite, similar in texture and chemistry to Shergotty, Zagami, and NWA 5298. It is composed of zoned pyroxene, maskelynite, merrillite, and Ti-oxide minerals with minor apatite, silica, and pyrrhotite.