Replication Data for: Saint-Pierre-le-Viger (L5-6) from asteroid 2023 CX1 recovered in the Normandy, France—220 years after the historic fall of L'Aigle (L6 breccia) in the neighborhood

Abstract: On February 13, 2023, a huge fireball was visible over Western Europe (fireball event 2023 CX1). After the possible strewn field was calculated, the first of several recovered samples, with a mass of about 100 g, was discovered just 2 days after the fireball event on the ground of the village of Saint-Pierre-le-Viger. Meanwhile, more than 60 samples with a total mass of more than 1 kg were recovered and a piece of one of these is studied here. The fall occurred 220 years after the historic meteorite fall of L'Aigle on April 26, 1803, <120 km south. L'Aigle is the closest meteorite fall to Saint-Pierre-le-Viger and belongs to the same chondrite group. Both meteorites are breccias containing only clasts of high metamorphic degree (type 5 and type 6). Since only 20% of the L chondrites are breccias this coincidence is remarkable. As just mentioned, both samples studied from these rocks in this work are ordinary chondrite breccias and consist of equilibrated and recrystallized lithologies of petrologic type 6. The brecciated texture in L'Aigle, resulting in a remarkable light–dark structure, is more pronounced than the brecciated features in Saint-Pierre-le-Viger, from which also type 5 fragments have been reported. The compositions of low-Ca pyroxene and olivine grains in Saint-Pierre-le-Viger (Fs21.2 and Fa23.4, respectively) clearly require an L-group classification. L'Aigle was classified as an L6 breccia in the past, and this has now been confirmed by new data on low-Ca pyroxene and olivine (Fs20.7 and Fa23.8, respectively). Saint-Pierre-le-Viger contains local thin shock veins, and both meteorites are moderately shocked. Most olivines in the studied samples have planar fractures, but the estimated abundance of mosaicized olivines of 30%–40% among the large grains require a S4 shock classification. Oxygen isotope and bulk chemical data of Saint-Pierre-le-Viger certainly support the L chondrite classification. Bulk spectral data of Saint-Pierre-le-Viger are dominated by silicate minerals, that is, Fe-bearing low-Ca pyroxene, olivine, and plagioclase. Isotopic, chemical, and spectral data of the L'Aigle meteorite are shown for comparison and are very similar, providing additional circumstantial evidence of Saint-Pierre-le-Viger's L chondritic nature.

摘要：2023年2月13日，西欧上空出现一颗明亮火球（火球事件2023 CX1）。在计算出可能的散落区域后，事件发生仅2天，人们便在圣皮埃尔勒维热（Saint-Pierre-le-Viger）村的地面上发现了首批回收样本之一，其质量约为100克。后续共回收60余块样本，总质量超过1千克，本文对其中一块样本展开研究。

该陨石坠落事件距离1803年4月26日发生的历史著名陨石坠落事件莱格尔（L'Aigle）仅220年，坠落地点位于其以南不足120千米处。莱格尔陨石是距离圣皮埃尔勒维热最近的已知陨石坠落事件，且二者同属球粒陨石（chondrite）类群。两块陨石均为角砾岩（breccia），仅包含高变质程度的岩屑（岩石学类型5和类型6）。由于L型球粒陨石中仅有20%为角砾岩，这一巧合极具研究价值。

正如前文所述，本研究针对两块陨石的样品均为普通球粒陨石角砾岩，由经平衡作用与重结晶作用形成的岩石学类型6的岩性构成。莱格尔陨石的角砾结构形成了显著的明暗相间构造，其发育程度优于圣皮埃尔勒维热陨石的角砾特征，后者还曾被报道存在岩石学类型5的岩屑。圣皮埃尔勒维热陨石中的低钙辉石与橄榄石晶粒成分分别为Fs₂₁.₂和Fa₂₃.₄，这明确指向其L族球粒陨石的分类属性。过往研究已将莱格尔陨石归类为L6角砾岩，本次通过低钙辉石和橄榄石的新测试数据（分别为Fs₂₀.₇和Fa₂₃.8）进一步验证了这一分类结论。

圣皮埃尔勒维热陨石含有局部薄冲击脉，两块陨石均受到中等程度的冲击作用。研究样本中的多数橄榄石发育有平面裂隙，但大颗粒橄榄石中镶嵌结构橄榄石的占比约为30%~40%，这表明其冲击等级应为S4。氧同位素数据与整体化学组成数据均支持圣皮埃尔勒维热属于L型球粒陨石的分类结论。圣皮埃尔勒维热的整体光谱数据以硅酸盐矿物为主，即含铁低钙辉石、橄榄石与斜长石。本文同时附上莱格尔陨石的同位素、化学与光谱数据以供对比，二者数据高度相似，为圣皮埃尔勒维热的L型球粒陨石属性提供了额外的间接佐证。

搜集汇总

背景与挑战

背景概述

该数据集聚焦于2023年CX1小行星事件在法国诺曼底Saint-Pierre-le-Viger地区回收的陨石样本，样本总质量超过1公斤，属于L群球粒陨石。分析显示，这些样本与220年前坠落的L'Aigle陨石具有相似的角砾岩结构和矿物成分，为研究陨石分类和历史关联提供了关键数据。