Science. 1977 Jul 1;197(4298):58-62. doi: 10.1126/science.197.4298.58.
The ratios of refractory elements to silicon and of zinc to silicon indicate that the silicate portion of the Netschaëvo meteorite is an ordinary chondrite. The scarcity of chondrules, the large dimensions (about 100 micrometers) of plagioclase grains, and the low indium content (0.09 nanogram per gram) indicate that Netschaëvo belongs to petrologic type 6. On a diagram of reduced iron versus oxidized iron, Netschaëvo lies along an extrapolation of the LL-L-H ordinary chondrite fractionation trend. The abundances of siderophile elements (nickel, germanium, iridium, and gold) are about 1.6 to 2.0 times greater than in H-group chondrites, and siderophile/nickel ratios are, with one exception, those expected from LL-L-H trends. This evidence indicates that Netschaëvo is an extremely iron-rich member of the ordinary chondrite sequence, and that plausible models to account for the ordinary chondrite sequence must produce materials having iron/silicon ratios 25 percent greater than those in CI carbonaceous chondrites. The existence of Netschaëvo emphasizes that the chondritic meteorites in terrestrial collections are a biased and incomplete selection of primitive solar system materials.
惰性元素与硅的比值和锌与硅的比值表明，Netschaevo 陨石的硅酸盐部分是普通球粒陨石。球粒的稀缺性、斜长石晶粒的大尺寸（约 100 微米）和铟含量低（0.09 纳克/克）表明，Netschaevo 属于岩石学类型 6。在还原铁与氧化铁的图上，Netschaevo 沿着 LL-L-H 普通球粒陨石分馏趋势的外推线。亲铁元素（镍、锗、铱和金）的丰度比 H 群球粒陨石高约 1.6 至 2.0 倍，亲铁/镍比值除一个例外外，均与 LL-L-H 趋势相符。这一证据表明，Netschaevo 是普通球粒陨石序列中极其富铁的成员，而解释普通球粒陨石序列的合理模型必须产生铁/硅比值比 CI 碳质球粒陨石高 25%的物质。Netschaevo 的存在强调了在地球上收集的球粒陨石是原始太阳系物质的有偏差和不完整的选择。
