Aqueous alteration without initial water: Possibility of organic-induced hydration of anhydrous silicates in meteorite parent bodies

doi:10.21203/rs.3.rs-50113/v1

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Aqueous alteration without initial water: Possibility of organic-induced hydration of anhydrous silicates in meteorite parent bodies

https://doi.org/10.21203/rs.3.rs-50113/v1

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published 11 Jan, 2021

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Early evolution of Solar System small bodies proceeded through interactions of mineral and water. Melting of water ice accreted with mineral particles to the parent body results in the formation of secondary minerals, the so-called aqueous alteration. Formation of phyllosilicates from anhydrous silicates is a typical alteration effect recorded in primitive meteorites. In addition to mineral and water, organic matter could have been also a significant component in meteorite parent bodies. However, the role of organic matter in the alteration of silicates is not well understood. Here we show the in-situ formation of hydrated silicates through a mineral–organic interaction without the initial presence of water. Proto-phyllosilicates were experimentally confirmed on the anhydrous mineral (olivine) surface after being heated with molecular cloud organic matter analog at 300 °C for 10 days in this study. It could be due to H 2 O generated through pyrolysis of the organic compounds with hydroxy groups. Our results indicated that formation of phyllosilicates on the olivine surface in contact with organic matter can occur in meteorite parent bodies which formed inside the H 2 O snow line but accreted with organic matter, initially without water. Water formed through decomposition of organic matter could be one candidate for hydrous silicate formation in ordinary chondrites from S-type asteroids inside the H 2 O snow line. Although the origin of water in ordinary chondrites is under debate, water generation from organic matter may also explain the D-rich water in ordinary chondrites because primordial organic matter is known to be D-rich.

Planetary Science

Meteorology

Organic matter

Phyllosilicates

Water

Chondrites

Small bodies

Minerals, water, and organic matter are the initial building blocks of our Solar System. Evolution of the early-stage Solar System proceeded with their interactions. Hydrated minerals in primitive meteorites and some interplanetary dust particles provide evidences of typical interaction induced by the presence of water (Bunch and Chang 1980; Tomeoka and Buseck 1985; Brearley 2006). For example, alteration of anhydrate silicates results in the formation of phyllosilicates. Phyllosilicates are abundant in CI, CM, and CR chondrites; thus, these chondrites experience strong aqueous activities (Brearley 2006). Phyllosilicates also exist in some “dry” chondrites such as CV, CO, and unequilibrated ordinary chondrites (Buseck and Hua 1993; Brearley 2006), although they are much less abundant compared with CI and CM chondrites. These phyllosilicates in such dry chondrites may be evidence of water in their parent bodies (Bischoff 1998); however, the origin of the water in these chondrites is not well understood.

These “dry” chondrites are known to be thermally metamorphosed in their parent bodies (Huss 2006). Even the least metamorphosed ordinary chondrites (unequilibrated ordinary chondrites) had experienced slight heating. For example, Semarkona meteorite (LL3.0) experienced ~260 °C (Alexander et al. 1989), and Bishunpur meteorite (LL3.15) experienced 300–400 °C (Rambaldi and Wasson 1981; Brearley 1990). Although these temperatures can result in low-degree effects on petrology or mineralogy, they can have significant influence on the structure and composition of organic matter in meteorites via various chemical reactions. In terms of interactions among minerals, water, and organic matter, the role of organic matter for alteration of minerals is not well understood. Recent studies suggested that minerals act as catalysts for the formation and evolution of organic matter (Pearson et al. 2002; Kebukawa et al. 2010; Le Guillou et al. 2014; Vinogradoff et al. 2020; Hirakawa et al. in revision). Chemical reactions of organic matter are frequently accompanied by simultaneous generation of by-products. Nakano et al. (2020) performed heating experiments of organic mixtures up to 400 °C, which simulated the evolution of primordial organic matter in meteorite parent bodies, and they found various by-products including CO, CO₂, and H₂O during the experiments. These compounds in turn could have influence on mineral alterations.

In this study, we performed a heating experiment of an anhydrous silicate (olivine) with an organic mixture simulating thermal metamorphism in meteorite parent bodies. The reaction products were analyzed using X-ray diffraction (XRD), secondary electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDS), and transmission electron microscopy with energy-dispersive X-ray spectroscopy (TEM/EDS). Through this study, we showed that minerals could be altered by organic matter in meteorite parent bodies without the initial presence of water.

2.1. Starting Materials

In this study, olivine was used as a typical anhydrous silicate in chondritic meteorites. San Carlos olivine powder (Fo91) was heated in an autoclave (Tama-Seiki) with a molecular cloud organic matter analog (Table S1, Nakano et al. 2002), which simulated the primordial organic matter accreted to meteorite parent bodies before thermal metamorphism. The olivine powder, the initial grain size of which was <200 µm, was ground before the experiments using an agate mortar to obtain a typical grain diameter of <50 µm. The organic mixture was prepared following the method of Kouchi et al. (2002), Nakano et al. (2002, 2003, 2020), and Hirakawa et al. (in revision).

2.2. Heating Experiment

For the heating experiment, 0.2 g of ground olivine powder with 1.0 g of organic mixture was sealed in a stainless-steel Swagelok tube fitting union (3/8 in.) with 316 stainless-steel plugs (3/8 in., 3.0 cm³) under N₂ gas atmosphere. The tube fitting was placed in an autoclave (Tama-Seiki) and then heated at 300 °C for 10 days (Figure S1). After the tube fitting was cooled, the experimental product was recovered. The product was rinsed with hexane (3 mL) and methanol (3 mL) to eliminate the organic matter from the surface of the olivine.

2.3. Characterization Techniques

2.3.1. XRD

The initial olivine and experimental product rinsed with hexane and methanol were analyzed by powder XRD using a SmartLab diffractometer with a Hypix-3000 detector (Rigaku, Ltd.) at 40 kV and 45 mA by Cu Kα radiation with a scan speed of 5.0°/min and a resolution of 0.01. Identification of the mineral phase was performed using SmartLab Studio II by searching the diffraction patterns from International Center for Diffraction Data (ICDD) database through the Hanawalt search method.

2.3.2. SEM/EDS

Grain size, morphology, and elemental composition of the experimental products were characterized using a scanning electron microscope (JSM-6510LA, JEOL) equipped with an energy-dispersive X-ray spectrometer (JED-2300, JEOL). Grains were fixed on a 10 mm brass stub with resin and were coated by Au sputtering. All grains were observed by secondary electron imaging at 15 kV. An elemental analysis was conducted by EDS at 20 kV.

2.3.3. Focused Ion Beam (FIB) Processing

Focused-ion-beam preparations were performed with an NX2000 (Hitachi High-Tech Global) at the Japan Aerospace Exploration Agency. First, the surface of the target area in an olivine grain on an SEM stub was covered with a carbon deposition layer. Three sides of the target area were milled on the surface of the SEM stub (~10 μm depth). After the bottom edge was cut, the section was suspended by a cantilever and then attached to a silicon nanomesh. The sample was thinned to the thickness that allows electron transparency (<100 nm) using successively lowered Ga⁺ ion beam currents of 12 nA, 1.5 nA, 280 pA, and 100 pA at 30 kV, and final polishing was done using a current of 20 pA at 10 kV and 20 pA at 5 kV of ion energy.

2.3.4. TEM/EDS

FIB thin sections were analyzed using TEM (JEM-2100F, JEOL) equipped with EDS (JED-2300T, JEOL) at Yokohama National University and Tohoku University. High-resolution images were obtained at 200 kV. EDS spectra were accumulated for 150–250 seconds.

3.1. XRD

While the bulk structure of olivine did not change significantly after heating with organic mixture, there were some evidences of mineral replacement in the XRD pattern of the olivine after the experiment (Figure 1). A wide loose curve from 15° to 50° in the baseline could indicate the existence of amorphous phase with crystalline olivine. A small peak around 43° was likely from magnesite and/or serpentine and a small peak around 54° was diffraction from magnesite (Lafey et al. 2014; Ulrich et al. 2014), which are secondary minerals formed during the heating of olivine with organic matter. A broad small peak at 7° was unidentified.

3.2. SEM/EDS

Clearly visible cracks with SEM images and abundant etch pits are the typical dissolution features on olivine grains (Malvoisin et al. 2012; Oelkers et al. 2018). SEM observation revealed these dissolution characteristics on the surface of olivine (Figure 2). Initial olivine used as the starting material in the heating experiment had angular shapes with smooth surfaces (Figure 2a, b). Numerous residual olivine grains after the experiment apparently showed the alteration features. Isolated conical etch pits are shown in Figure 2c, d (hereafter called grain A) and polyhedral etch pits are shown in Figure 2e, f (hereafter called grain B). Most of the etch pits detected in this study were conical to polyhedral or pyramidal features.

Precipitation features, which had a webbed structure, covered the surface of the heated grains (Figure 2c, d). This structure gradually suffered damage during SEM observation, indicating the presence of materials that interact with the electron beam. Irregularly shaped fragile materials 1–10 µm in diameter were also on the surface of the olivine (Figure 2e–h).

The chemical composition of olivine obtained by EDS had a 1:2 Si/(Mg + Fe) molar ratio (Figure S2). Flat surface areas of the grains in the experimental product showed similar compositions as the starting materials, while the areas covered with precipitation features showed Mg-poor and Si-rich compositions.

3.3. TEM/EDS

TEM investigations revealed a change of morphologies near the grain surface areas. Figure 3 is a TEM image with elemental mappings of the FIB section taken from the etch pit area shown in Figure 2g, h. A matrix of flake-like particles constituting an anastomosing network was observed in this area. C, O, and Mg were uniformly distributed in the mapping area, while Si and Fe showed an irregular distribution feature. Si was concentrated in the flake-like particles (Figure 3c). Iron oxides were on the etch pits (Figure 3e, f). Nanoscale round black particles in Figure 3a were Au particles from the coatings on the surface of grain B for SEM observations. A TEM image of the other area in the FIB section showed tubular fibers (<100 nm thick) on the surface of olivine that were anastomosed and were poorly crystalline (Figure 4). The lattice fringes were unclear and were easily damaged by the electron beam during TEM observation. The electron diffraction spots (Figure 4), were not clear enough for identifying crystal structure. These features were significantly similar to those of proto-serpentine reported by Lafey et al. (2016), which could be formed in the first step of serpentinization of olivine (Lafey et al. 2012, 2016).

4.1. Alteration of Olivine

It is well known that mineral replacements such as serpentinization take place primarily by　dissolution–precipitation processes (Putnis 2002; Lafay et al. 2012). Etch pits confirmed by SEM (Figure 2c–f) on the surface of product grains could be the preferential dissolution features at the first step of serpentinization. These etch pits become deeper as alteration proceeds (Malvoisin et al. 2012). Thus, isolated conical etch pits (Figure 2c, d) would evolve to a network of polyhedral and pyramidal mounts (Figure 2e, f) and ultimately to a mammillated (sawtooth) topography (Malvoisin et al. 2012). It indicates that the alteration degree in grain B (Figure 2e, f) is advanced as compared with grain A (Figure 2c, d).

Olivine dissolution proceeds by the breaking of Mg–O bonds and an early rapid reversible exchange of Mg for protons on the olivine surface, which then liberates the SiO₄⁴⁻ anions directly into solution in acidic to neutral solution (Luce et al. 1972; Oelker et al. 2018). In contrast, Si–O structures preferentially dissolved ahead of cation dissolution in alkaline solution (Oelkes et al. 2018). These processes could result in depletion of Mg or Si on the olivine surface. Mg-poor and Si-rich webbed-like structure covering the surface of olivine after the experiments could be precipitation features of dissolved silicate (Lisabeth et al. 2017). Although the pH of generated water was not clear in this study, carboxylic acids could contribute to weakly acidic water. Decomposition of amides and hexamethylenetetramine, on the contrary, could generate NH₃ (Iwakami et al. 1968), which could result in alkaline water. Water experimentally obtained by Nakano et al. (2020) was at pH 9.3 because of dissolved NH₃. Thus, the pH of water could strongly depend on the composition of the initial organic matter.

Amorphous proto-serpentine phase precipitated onto the etch pits; thus, growth and crystallization of serpentine proceeded in the precipitation area within or on the etch pits (Plümper et al. 2012). Talc could also grow with higher silica activity and CO₂ concentration (Moore and Rymer 2007; Oelker et al. 2018). Thus, Si-rich flake-like particles in Figure 3 and tubular fibers in Figure 4 were precipitated features of proto-phyllosilicates, and these features could be the same material for the Mg-poor and Si-rich precipitation features in Figure 2c, d. The formation of tubular structures (Figure 4) also indicated the incipient formation of serpentine or talc on the surface of olivine grains. However, we could not confirm highly crystalline phyllosilicate by electron diffraction because the incomplete crystallization structures resulted in unclear lattice images and electron diffraction spots (Lafey et al. 2016). A schematic image of serpentinization based on obtained characteristics in this study is shown in Figure 5.

The rate of serpentinization typically depends on temperature, pH, water/rock ratio, and initial grain size (Malvoisin et al. 2012). Reaction progress of serpentinization from olivine with 38–50 μm grain size reached nearly 40 % in 250 days at 300 °C, and the major serpentine was lizardite (Malvoisin et al. 2012). Duration of the reaction in this study was 10 days and was likely too short to reach complete serpentinization, although serpentinization rate was the highest at 300 °C compared with those at higher or lower temperature (Wegner and Ernst 1983; Malvoisin et al. 2012). Yada and Iishi (1974, 1977), however, confirmed the formation of serpentine in shorter time (30 minutes to 10 days) at 250–400 °C at pH 3–13. In that case, conical chrysotile was the major serpentine in fairly wide ranges of pH and temperature, and lizardite existed at higher temperatures and longer durations. Under the alteration conditions in this study, finding proto-serpentine was reasonable, and it could grow toward chrysotile in several months.

4.2. Role of Organic Matter

Serpentinization demands water, but water was not present in the starting material in this study. Water, which is required for serpentinization, could be generated through organic reactions such as dehydration condensation of carboxylic acids and alcohols in the starting material at 300 °C (Hirakawa et al. in revision). Nakano et al. (2020) showed the formation of water from the same organic mixture we used in this study (Table S1). The amount of water formed depended on the content of hydroxy group (–OH) of the starting materials (Nakano et al. 2020). Decomposition of these organic compounds could form smaller molecules such as CO, CO₂, CH₄, H₂, C₂H₆, and C₃H₈ (Nakano et al. 2003). It is consistent with the generation of CO, CO₂, CH₄, and H₂O through the destruction of insoluble organic matter in thermally metamorphosed chondrite parent bodies suggested by Alexander et al. (2010). In addition, our previous study showed that decarboxylation was promoted by olivine at 300 °C (Hirakawa et al. in revision). Magnesite, which could be formed via aqueous carbonation of olivine (see details below), as detected by XRD, also indicates the formation of CO₂ from the organic mixture.

Phyllosilicates and magnesium carbonate (magnesite) are thermodynamically stable solids in the MgO–SiO₂–H₂O–CO₂ closed system at 300 °C and under 1–100 bar of partial pressure of CO₂ (Oelkers et al. 2018). Magnesium olivine (forsterite) favors reactions that form serpentine and magnesite in accordance with

2Mg₂SiO₄ + CO₂ + 2H₂O → Mg₃Si₂O₅(OH)₄ + MgCO₃

(Forsterite) (Serpentine) (Magnesite)

or talc and magnesite in accord with:

4Mg₂SiO₄ + 5CO₂ + H₂O → Mg₃Si₄O₁₀(OH)₂ + 5MgCO₃

(Forsterite) (Talc) (Magnesite)

under higher CO₂ concentration in water (Oelkers et al. 2018). Organic-induced serpentinization is possible with simultaneous water formation from dehydration of organic compounds. It also indicates the possibility of in situ formation of phyllosilicates inside the H₂O snow line because refractory organic compounds, in contrast to H₂O, could survive during accretion of planetesimals in the area, as discussed below.

4.3. Possible Aqueous Alteration in the “Dry” Parent Bodies

Recent astronomical observations revealed the existence of organic molecules with hydroxy groups such as CH₃OH (Walsh et al. 2016), HCOOH (Favre et al. 2018) in protoplanetary disk, as well as CH₃CH₂OH, CH₃COOH, and HOCH₂CHO were suggested by model calculation (Walsh et al. 2016). CH₃CH₂OH, CH₃COOH and HOCH₂CHO were detected from the low-mass protostar IRAS 16293–2422 (Bisschop et al. 2008; Jerry Shiao et al. 2010; Jørgensen et al. 2012).. They could be delivered inside the snow line on dust particles. Water and highly-volatile organic compounds evaporated inside the snow line, but the other organic molecules could remain on the grain surfaces. At least, organic compounds such as polyaromatic hydrocarbons, aliphatic hydrocarbons, alcohols, carboxylic acids, and macromolecular organics detected in cometary dusts could survive inside the sublimation area of water ice (Herbst and van Dishoeck, 2009; Welsh et al. 2014). In that case, organic matter could accumulate on planetesimals without water or with little water.

Ordinary chondrites originate from S-type asteroids located in the inner region of the asteroid belt inside the snow line. However, some ordinary chondrites show aqueous alteration features. For example, the Semarkona meteorite (LL3.0) has phyllosilicates (Alexander et al. 1989; Piani et al. 2015). The major phyllosilicate phases in Semarkona is smectite, and carbonate is calcium carbonate (Hutchison et al. 1987; Alexander et al. 1989), although proto-phyllosilicate and magnesium carbonate formed in the present study. These differences could be due to the glassy mesostases in Semarkona (Hutchison et al. 1987). The glassy mesostases are highly susceptible to hydration compared with crystalline olivine (Dobrica and Brearley 2020). The total amount of water generated from organic matter could be much less than that present in aqueously altered carbonaceous chondrite parent bodies. Thus, in the case of Semarkona, the small amount of water generated from organic matter could contribute to dissolution of glassy mesostases to form smectite and calcium carbonate (Hutchison et al. 1987), preceding the dissolution of olivine.

Water abundance in the bulk Semarkona was estimated as 0.2-0.7 wt.% (Alexander et al. 2010). Assuming that primordial organic matter accumulated in the Semarkona parent body was similar to the organic mixture used in this study, at least 1.0-3.5 wt.% of organic matter have to initially present in the parent body necessary for producing the amount of water in Semarkona, since the water produced from the organic mixture was approximately 20 vol.% (Nakano et al. 2020). Organic carbon in the bulk Semarkona meteorite as insoluble organic matter is 0.36 wt.% (Alexander et al. 2007), thus if the water was delivered from organics, some of organic matter should have been lost through subsequent thermal processes.

Results in the present study indicate that the hydration of anhydrous silicate was possible in their parent bodies with organic matter even if water ice did not accumulate on them. Thus, organic-induced phyllosilicate formation could be the significant process in “dry” parent bodies inside the H₂O snow line. Our results further implied that organic matter was one of the possible sources of deuterium-rich water in ordinary chondrites. For example, water in CM chondrites are homogeneously D-poor (Alexander et al. 2012). The water could have originated from isotopic re-equilibration in the inner disk between gaseous H₂O and the D-depleted solar H₂ (Jacquet and Robert 2013). In contrast to these, the D/H ratios of water in ordinary chondrites are highly heterogeneous (Alexander et al. 2017). Some of them show significantly high D/H ratios, similar to some comets (Piani et al. 2015). The existence of D-rich water in ordinary chondrites was explained by an oxidation reaction of Fe metal (3Fe + 4H₂O = Fe₃O₄ + 4H₂; Alexander et al. 2010, 2017). Loss of isotopically light H₂ gas would have enriched the residual water in deuterium (Alexander et al. 2017). Piani et al. (2015), however, pointed out that the process would have required a large amount of initial water and a significant amount of oxidation reactions to explain the high D/H values. Their suggestion was that the D-rich water could originate from isotopically heterogeneous ice inherited from the interstellar ice (Piani et al. 2015). In addition to these hypotheses, Nakano et al. (2020) suggested that precometary organic matter formed in a molecular cloud could be another water source in ordinary chondrite parent bodies. High deuterium concentration in organic matter is well known in the interstellar medium (ISM) and the outer region of the Solar System (Owen et al. 1986; Mauersberger et al. 1988; Cecilia 2002; Parise et al. 2004). These organic molecules could be enriched in deuterium by ion-molecular reaction (Millar 2003) in the gas phase and/or by grain surface reactions in molecular clouds (Parise et al. 2004; Watanabe and Kouchi, 2008; Taquet et al. 2012). Some of them could reach the inner region of the solar nebula (Walsh et al. 2014). Although deuterium tends to concentrate on methyl or ethyl group more than on hydroxy groups in alcohols in molecular clouds (Nagaoka et al. 2005; Oba et al. 2016), deuterated molecules such as CH₃OD were confirmed in ISM (Mauersberger et al. 1988). Thus, both D-poor and D-rich water could be generated from hydroxy groups in organic matter, and such water could then contribute to both D-rich and D-poor hydrated minerals, as well as explain the heterogeneous D/H distribution in ordinary chondrites. Further studies are needed to understand the D/H fractionation between organic matter and phyllosilicates. Organic matter in ordinary chondrites is generally ¹⁵N-poor as compared with ¹⁵N-rich organic matter in the outer Solar System. However, nitrogen abundances in ordinary chondrites are small, and ¹⁵N-rich organic matter may be preferentially removed during thermal metamorphism (Alexander et al. 1998).

To investigate the possible hydration of anhydrous silicates by organic matter in meteorite parent bodies, we performed a heating experiment using olivine with molecular cloud organic matter analog. In situ formation of proto-phyllosilicate was confirmed on the surface of reacted olivine. This result indicated that organic-induced alteration of silicates was a possible reaction process in “dry” meteorite parent bodies that accreted inside the H₂O snow line with delivery of organic compounds with hydroxyl groups onto them. Alteration characteristics in some ordinary chondrites could be partially derived from these processes. In that case, significantly heterogeneous D/H distribution and highly D-rich water in ordinary chondrites could also explained by the production of water from D-rich organic matter.

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List of abbreviations

XRD: X-ray diffraction

SEM: Scanning electron microscope

EDS: Energy dispersive X-ray spectrometer

FIB: Focused ion beam

TEM: Transmission electron microscope

Availability of data and materials

The datasets in this study are available from the corresponding author on reasonable request.

Competing interests

The authors declare that they have no competing interests.

Funding

This research was supported by the Japan Society for the Promotion of Science KAKENHI (grant numbers JP17H06458, JP18K03722, and JP19H05073), the Sasakawa Scientific Research Grant from The Japan Science Society (grant number 2020-6037), and the Research Scholarship for Young Scientists in the Graduate School of Engineering Science, Yokohama National University.

Authors' contributions

NH conducted the experiments, performed XRD and SEM analyses, and interpreted the data, under the supervisions of YK and KK. NH wrote the manuscript with help from YK. YF and MK performed TEM analyses. All authors contributed to and approved the final manuscript.

Acknowledgements

We would like to thank Dr. Shungo Kawagata for providing access to the SEM/EDS equipment, Dr. Aiko Nakato for supporting the FIB processing, Mr. Takamichi Miyazaki for supporting the TEM analysis, and Dr. George D. Cody for providing olivine. We thank Astromaterials Science Research Group (ASRG) for the use of the FIB facility.

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Aqueous alteration without initial water: Possibility of organic-induced hydration of anhydrous silicates in meteorite parent bodies

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