Investigation of organo-carbonate associations in carbonaceous chondrites by Raman spectroscopy

Chan, Q. H. S.; Zolensky, M. E.; Bodnar, Robert J.; Farley, C. W.; Cheung, Jacob C. H.

doi:10.1016/j.gca.2016.10.048

Cited by 35 publications

(37 citation statements)

References 97 publications

(213 reference statements)

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“…We carefully checked for contributions (contamination) from organic matter possibly contained in the calcite grains (ref. 47 ) by monitoring 12 Cand 12 C 14 Nintensities so that the presented  13 C values are not compromised by contamination. The external reproducibility (2) of the analyses was typically about 6‰.…”

Section: Our Conclusion Might Be Inconsistent With the H Isotopic Ratmentioning

confidence: 99%

Migration of D-type asteroids from the outer Solar System inferred from carbonate in meteorites

et al. 2019

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Recent dynamical models of Solar System evolution and isotope studies of rock-forming elements in meteorites have suggested that volatile-rich asteroids formed in the outer Solar System beyond Jupiter's orbit, despite being currently located in the main asteroid belt 1-4 . The ambient temperature under which asteroids formed is a crucial diagnostic to pinpoint the original location of asteroids and is potentially determined by the abundance of volatiles they contain. In particular, abundances and 13 C/ 12 C ratios of carbonates in meteorites record the abundances of carbonbearing volatile species in their parent asteroids. However, the sources of carbon for these carbonates remain poorly understood 5-8 . Here we show that the Tagish Lake meteorite contains abundant carbonates with consistently high 13 C/ 12 C ratios. The high abundance of 13 C-rich carbonates in Tagish Lake excludes organic matter as their main carbon source 5,9 . Therefore, the Tagish Lake parent body, presumably a D-type asteroid 10 , must have accreted a large amount of 13 C-rich CO2 ice. The estimated 13 C/ 12 C and CO2/H2O ratios of ice in Tagish Lake are similar to those of cometary ice 11,12 . Thus, we infer that at least some D-type asteroids formed in the cold outer Solar System and were subsequently transported into the inner Solar System owing to an orbital instability of the giant planets 1,3 .We performed in situ C-isotope measurements on individual grains of carbonate minerals, calcite (CaCO3) and dolomite (CaMg(CO3)2), in Tagish Lake, an ungrouped carbonaceous chondrite (CC) with a petrologic type of 2, indicating that it underwent aqueous alteration 13,14 (Methods). For comparison, we also conducted C-and O-isotope measurements on calcite grains in two Mighei-type carbonaceous chondrites (CM chondrites) with a petrologic type of 2, Nogoya and LaPaz Icefield (LAP) 031166. Due to the small grain size of Tagish Lake carbonates, we were not able to measure O isotopic ratios ( Supplementary Fig. 1). The  13 C and  18 O values ( 13 C/ 12 C and 17,18 O/ 16 O ratios are also expressed as  13 CVPDB and  17,18 OVSMOW, respectively, which represent permil, 10 -3 expressed as ‰, deviations from the isotopic ratios of standard materials: VPDB, Vienna Pee Dee Belemnite; VSMOW, Vienna Standard Mean Ocean Water) of CM carbonates are highly variable, ranging from approximately 20 to 80‰ and from approximately 15 to 40‰, respectively, and do not correlate with each other (Fig. 1a and Supplementary Table 1).The O-isotope data of CM carbonates plot on a single trend line (Fig. 1b), reflecting a change in formation temperatures and/or in the O isotopic ratios of fluids from which they formed. Therefore, the lack of correlation between  13 C and  18 O indicates that the variable  13 C values of CM carbonates must reflect isotopic heterogeneity of carbon sources (Methods). In contrast to CM carbonates, Tagish Lake carbonates have 478, 218-220 (2011). 28. Dauphas, N. The isotopic nature of the Earth's accreting material through time. Nature 541, 5...

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Section: Our Conclusion Might Be Inconsistent With the H Isotopic Ratmentioning

confidence: 99%

Migration of D-type asteroids from the outer Solar System inferred from carbonate in meteorites

et al. 2019

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“…Wavelength calibration against a silicon wafer sample was checked daily prior to sample analyses. Details of the Raman technique are given in Chan et al (2017b) and Kebukawa et al (2017).…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…The peak parameters of the D and G bands, such as the peak center locations (usually referred to as peak position, x), peak widths in terms of full width halfmaximum (FWHM, Γ), and the peak intensity ratios between the D and G bands (I D /I G ), were documented to systematically correlate with various properties of Before heating After heating OM in meteorites. The combination of these peak parameters describes the overall size distribution of the crystalline domains and the metamorphic history of the carbonaceous host (Beyssac et al 2002;Quirico et al 2003;Bonal et al 2006Bonal et al , 2007Busemann et al 2007;Aoya et al 2010;Kouketsu et al 2014;Homma et al 2015;Chan et al 2017b). Due to the sample heterogeneity of the Tagish Lake meteorite , and the adoption of different analytical methods and peak fitting algorithm, the Raman parameters of the OM in the Tagish Lake meteorite reported by different studies Matrajt et al 2004;Busemann et al 2007;Quirico et al 2014) are not necessarily the same (Table S1 in supporting information).…”

Section: Om In the Unheated Tagish Lake Meteoritementioning

confidence: 99%

“…The estimated heating durations of TMCCs are surprisingly short when compared to parent body heating with heat sources derived from in situ decay of radionuclides that could last millions of years. The heating conditions of TMCCs were estimated to be 10 to 10 3 days at 700°C to 1 to 100 h at 890°C, which suggest that they have experienced short-term heating possibly induced by impact and/or solar radiation (Nakato et al 2008;Yabuta et al 2010;Chan et al 2017b).…”

Section: Introductionmentioning

confidence: 99%

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Heating experiments of the Tagish Lake meteorite: Investigation of the effects of short‐term heating on chondritic organics

Chan

Nakato

Kebukawa

et al. 2018

Meteorit & Planetary Scien

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We present in this study the effects of short‐term heating on organics in the Tagish Lake meteorite and how the difference in the heating conditions can modify the organic matter (OM) in a way that complicates the interpretation of a parent body's heating extent with common cosmothermometers. The kinetics of short‐term heating and its influence on the organic structure are not well understood, and any study of OM is further complicated by the complex alteration processes of the thermally metamorphosed carbonaceous chondrites—potential analogues of the target asteroid Ryugu of the Hayabusa2 mission—which had experienced posthydration, short‐duration local heating. In an attempt to understand the effects of short‐term heating on chondritic OM, we investigated the change in the OM contents of the experimentally heated Tagish Lake meteorite samples using Raman spectroscopy, scanning transmission X‐ray microscopy utilizing X‐ray absorption near edge structure spectroscopy, and ultraperformance liquid chromatography fluorescence detection and quadrupole time of flight hybrid mass spectrometry. Our experiment suggests that graphitization of OM did not take place despite the samples being heated to 900 °C for 96 h, as the OM maturity trend was influenced by the heating conditions, kinetics, and the nature of the OM precursor, such as the presence of abundant oxygenated moieties. Although both the intensity of the 1s−σ* exciton cannot be used to accurately interpret the peak metamorphic temperature of the experimentally heated Tagish Lake sample, the Raman graphite band widths of the heated products significantly differ from that of chondritic OM modified by long‐term internal heating.

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“…Fragments of Jbilet Winselwan are wind ablated and have cracks filled with secondary alteration products but it otherwise has a low weathering grade of W1 (Ruzicka et al 2015). As a large and relatively fresh example of a CM chondrite, Jbilet Winselwan is being widely used in studies by the meteorite community (e.g., G€ opel et al 2015;Van Kooten et al 2016;Thangjam et al 2016;Chan et al 2017;Friend et al 2018).…”

Section: Introductionmentioning

confidence: 99%

The alteration history of the Jbilet Winselwan CM carbonaceous chondrite: An analog for C‐type asteroid sample return

King

Russell

Schofield

et al. 2018

Meteorit & Planetary Scien

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Jbilet Winselwan is one of the largest CM carbonaceous chondrites available for study. Its light, major, and trace elemental compositions are within the range of other CM chondrites. Chondrules are surrounded by dusty rims and set within a matrix of phyllosilicates, oxides, and sulfides. Calcium‐ and aluminum‐rich inclusions (CAIs) are present at ≤1 vol% and at least one contains melilite. Jbilet Winselwan is a breccia containing diverse lithologies that experienced varying degrees of aqueous alteration. In most lithologies, the chondrules and CAIs are partially altered and the metal abundance is low (<1 vol%), consistent with petrologic subtypes 2.7–2.4 on the Rubin et al. () scale. However, chondrules and CAIs in some lithologies are completely altered suggesting more extensive hydration to petrologic subtypes ≤2.3. Following hydration, some lithologies suffered thermal metamorphism at 400–500 °C. Bulk X‐ray diffraction shows that Jbilet Winselwan consists of a highly disordered and/or very fine‐grained phase (73 vol%), which we infer was originally phyllosilicates prior to dehydration during a thermal metamorphic event(s). Some aliquots of Jbilet Winselwan also show significant depletions in volatile elements such as He and Cd. The heating was probably short‐lived and caused by impacts. Jbilet Winselwan samples a mixture of hydrated and dehydrated materials from a primitive water‐rich asteroid. It may therefore be a good analog for the types of materials that will be encountered by the Hayabusa‐2 and OSIRIS‐REx asteroid sample‐return missions.

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Investigation of organo-carbonate associations in carbonaceous chondrites by Raman spectroscopy

Cited by 35 publications

References 97 publications

Migration of D-type asteroids from the outer Solar System inferred from carbonate in meteorites

Migration of D-type asteroids from the outer Solar System inferred from carbonate in meteorites

Heating experiments of the Tagish Lake meteorite: Investigation of the effects of short‐term heating on chondritic organics

The alteration history of the Jbilet Winselwan CM carbonaceous chondrite: An analog for C‐type asteroid sample return

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