Co-evolution of organics and water in experimentally shocked Murchison and EET 90628 chondrites

IF 4.5 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Geochimica et Cosmochimica Acta Pub Date : 2025-06-01 DOI:10.1016/j.gca.2025.05.046

E. Quirico, H. Yabuta, P. Beck, L. Bonal, A. Bardyn, L.R. Nittler, C.M.O’D. Alexander

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Abstract

A significant population of primitive carbonaceous chondrites experienced short-duration heating, which is usually attributed to either impact or solar heating. Shock recovery experiments performed on carbonaceous chondrites have successfully reproduce the typical evolution in the petrographies and mineralogical compositions of natural samples. However, only few studies focused on the chemical and structural transformations of insoluble organic matter (IOM). We report here on shock recovery experiments conducted on two chondrites: Murchison (CM2) and Elephant Moraine EET 90628 (L3.0). Experiments on Murchison show carbonization and oxidation of IOM at all shock intensities (5–50 GPa) and a pronounced structural evolution at 40 GPa associated with complete dehydroxylation of serpentines, as well as formation of olivine and amorphous silicates. The δD value of Murchison IOM (initial δD = 1636 ± 529 ‰) evolves significantly, with the rapid disappearance of isotopic hot spots and a bulk δD of −79 ‰ at 40 GPa. At 40 GPa, the extent of dehydroxylation of serpentines is consistent with stage III heated chondrites, but the structural characteristics of the IOM resembles material from stage II meteorites, i.e. a slight modification of the IOM in a matrix dominated by serpentines.

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实验震波Murchison和EET 90628球粒陨石中有机物和水的共同演化

大量原始碳质球粒陨石经历了短时间的加热，这通常归因于撞击或太阳加热。对碳质球粒陨石进行的冲击恢复实验成功地再现了自然样品岩石学和矿物学成分的典型演化。然而，对不溶性有机物（IOM）的化学和结构转化的研究很少。本文报道了在两个球粒陨石：Murchison （CM2）和Elephant Moraine EET 90628 （L3.0）上进行的冲击恢复实验。Murchison的实验表明，在所有冲击强度（5-50 GPa）下，IOM发生碳化和氧化，在40 GPa下，与蛇纹石完全去羟基化以及橄榄石和无定形硅酸盐的形成相关的明显结构演变。Murchison IOM的δD值（初始δD = 1636±529‰）变化明显，同位素热点迅速消失，40 GPa时δD值为−79‰。在40 GPa时，蛇纹石的脱羟基程度与III期加热球粒陨石一致，但IOM的结构特征类似于II期陨石的物质，即在以蛇纹石为主的基质中略有改变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geochimica et Cosmochimica Acta 地学-地球化学与地球物理

CiteScore

9.60

自引率

14.00%

发文量

437

审稿时长

6 months

期刊介绍： Geochimica et Cosmochimica Acta publishes research papers in a wide range of subjects in terrestrial geochemistry, meteoritics, and planetary geochemistry. The scope of the journal includes: 1). Physical chemistry of gases, aqueous solutions, glasses, and crystalline solids 2). Igneous and metamorphic petrology 3). Chemical processes in the atmosphere, hydrosphere, biosphere, and lithosphere of the Earth 4). Organic geochemistry 5). Isotope geochemistry 6). Meteoritics and meteorite impacts 7). Lunar science; and 8). Planetary geochemistry.