Abstract This paper focuses on the post-accretion history of CV3 chondrites, through a combination of petrographic and mineralogical characterization, magnetic measurements, spectral (Raman and Infrared) and thermo-gravimetric analysis of 31 meteorites (including 7 falls, 21 Antarctic and 3 non-Antarctic finds) spanning a wide metamorphic range. We classify the 21 Antarctic chondrites and the Bukhara fall into the CVRed, CVOxA, and CVOxB subgroups. We establish quantitative parameters relevant for this sub-classification. In comparison to CVOx, CVRed chondrites are characterized by (i) a lower abundance of matrix, (ii) a higher abundance of metal, (iii) the presence of Ni-poor sulfides. In comparison to CVOxB, CVOxA are characterized by (i) similar matrix abundance, (ii) a higher abundance of metal, (iii) the presence of metal almost exclusively under the form of awaruite, (iv) lower Ni content of sulfides, (v) lower magnetic susceptibility and saturation remanence. Both CVOx (CVOxA and CVOxB) and CVRed experienced aqueous alteration, and contain oxyhydroxides and phyllosilicates. We show that the abundance of these hydrated secondary minerals observed today in individual CV chondrites decreases with their peak metamorphic temperature. This is interpreted either as partial dehydration of these secondary minerals or limited hydration due to the rapid exhaustion of the water reservoir during parent body thermal metamorphism. Moreover, the lower abundance of oxyhydroxides (that have a lower thermal stability than phyllosilicates and may in large part postdate the peak of thermal metamorphism) in more metamorphosed CV chondrites is interpreted as lower availability of aqueous fluids during retrograde metamorphism in these meteorites. Lastly, we show that in comparison to CVOxB, CVOxA are systematically (i) more metamorphosed, (ii) less hydrated, (iii) depleted in ferromagnetic minerals, (iv) but enriched in metal in the form of secondary awaruite. CVOxA may be thermally metamorphosed CVOxB. CVRed are significantly different from CVOx (matrix abundances, alteration products, opaque minerals), but span the same wide metamorphic range. This could be indicative of a laterally heterogeneous CV parent body, or suggest the existence of distinct parent bodies for CVOx and CVRed chondrites.

中文翻译：

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水和热：CV 球粒陨石母体演化的新限制

摘要 本文通过对 31 颗陨石（包括 7 颗陨石、21 颗南极陨石和 3 颗非陨石）的岩相学和矿物学表征、磁测量、光谱（拉曼和红外）和热重分析相结合，重点关注 CV3 球粒陨石的吸积后历史。 -南极发现）跨越广泛的变质范围。我们将 21 种南极球粒陨石和布哈拉球粒陨石分为 CVRed、CVOxA 和 CVOxB 亚组。我们建立与此子分类相关的定量参数。与 CVOx 相比，CVRed 球粒陨石的特点是 (i) 基质丰度较低，(ii) 金属丰度较高，(iii) 存在贫镍硫化物。与 CVOxB 相比，CVOxA 的特点是 (i) 相似的基质丰度，(ii) 更高的金属丰度，(iii) 金属的存在几乎完全以铝锌矿的形式存在，(iv) 硫化物的镍含量较低，(v) 较低的磁化率和饱和剩磁。CVOx（CVOxA 和 CVOxB）和 CVRed 都经历了水性改变，并含有羟基氧化物和页硅酸盐。我们表明，今天在单个 CV 球粒陨石中观察到的这些水合次生矿物的丰度随着它们的峰值变质温度而降低。这被解释为这些次生矿物的部分脱水或由于母体热变质过程中水库迅速枯竭而导致的有限水合作用。而且，在更变质的 CV 球粒陨石中，羟基氧化物的丰度较低（其热稳定性低于页硅酸盐，并且可能在很大程度上晚于热变质的峰值）被解释为这些陨石在逆行变质过程中含水流体的可用性较低。最后，我们表明，与 CVOxB 相比，CVOxA 系统性地 (i) 变质更多，(ii) 水合更少，(iii) 铁磁矿物耗尽，(iv) 但富含以次生金属片形式存在的金属。CVOxA 可以是热变形的 CVOxB。CVRed 与 CVOx（基质丰度、蚀变产物、不透明矿物）显着不同，但跨越相同的宽变质范围。这可能表明侧向异质 CV 母体，