Stable Isotope Geochemistry

Hoefs, Jochen

doi:10.1007/978-3-319-19716-6

Cited by 176 publications

(141 citation statements)

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“…On Earth carbon isotope fractionation for heterotrophic and autotrophic organisms (e.g. plants and animals)4245 relative to inorganic carbon (CO 2 , carbonate) is well described44. Plants and other autotrophs fix CO 2 .…”

Section: Discussionmentioning

confidence: 99%

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Chloromethane release from carbonaceous meteorite affords new insight into Mars lander findings

Keppler

Harper

Greule

et al. 2014

Sci Rep

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Controversy continues as to whether chloromethane (CH3Cl) detected during pyrolysis of Martian soils by the Viking and Curiosity Mars landers is indicative of organic matter indigenous to Mars. Here we demonstrate CH3Cl release (up to 8 μg/g) during low temperature (150–400°C) pyrolysis of the carbonaceous chondrite Murchison with chloride or perchlorate as chlorine source and confirm unequivocally by stable isotope analysis the extraterrestrial origin of the methyl group (δ2H +800 to +1100‰, δ13C −19.2 to +10‰,). In the terrestrial environment CH3Cl released during pyrolysis of organic matter derives from the methoxyl pool. The methoxyl pool in Murchison is consistent both in magnitude (0.044%) and isotope signature (δ2H +1054 ± 626‰, δ13C +43.2 ± 38.8‰,) with that of the CH3Cl released on pyrolysis. Thus CH3Cl emissions recorded by Mars lander experiments may be attributed to methoxyl groups in undegraded organic matter in meteoritic debris reaching the Martian surface being converted to CH3Cl with perchlorate or chloride in Martian soil. However we cannot discount emissions arising additionally from organic matter of indigenous origin. The stable isotope signatures of CH3Cl detected on Mars could potentially be utilized to determine its origin by distinguishing between terrestrial contamination, meteoritic infall and indigenous Martian sources.

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Section: Discussionmentioning

confidence: 99%

“…Carbon isotopic composition of materials from Mars7484950, Earth45 and carbonaceous chondrites27515253 (modified Leshin et al 7). For comparison δ 13 C values of CH 3 Cl and precursor methoxyl groups measured during this study and from previous studies121323.…”

Section: Figurementioning

confidence: 99%

Chloromethane release from carbonaceous meteorite affords new insight into Mars lander findings

Keppler

Harper

Greule

et al. 2014

Sci Rep

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“…A meteoric water line is drawn to differentiate between waters from the Lusi and fresh waters from the surrounding area. Water criteria are due to Hoefs [19], and the Lusi waters are included into formation water criteria.…”

Section: Ree Content and Clay Structurementioning

confidence: 99%

Rare earth element contents of the Lusi mud: An attempt to identify the environmental origin of the hot mudflow in East Java – Indonesia

et al. 2017

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Abstract:The Sidoarjo mudflow in East Java, Indonesia, has been erupting since May 29 th , 2006. The eruption has been known as the Lusi (lumpur Sidoarjo), which was previously considered as a remote seismic event consequence, but current geyser-like activities show an association with a geothermal phenomenon. A method of characterizing rare earth elements (REE) is commonly an effective tool for recognizing a geothermal system, and here it is adapted to particularly indicate the environmental origin of the Lusi mud. Results show that the Lusi hot mud is made of a porous smectite structure of a shale rock type, which becomes an ideal tank for trapping the REE, especially the light REE. Volcanic activities seem to be an important influence in the eruption; however, since there is a lack of significant isotopic evidences in the mobilization of the REE during the eruption, the chloride neutral pH water of the Lusi may hardly contain the REE. The moderate Ce and Eu anomalies found in the REE patterns of the mud strongly indicate a sea-floor basin as the most probable environment for the REE fractionation during the sedimentary rock formation, in which the weathering processes of volcanic rock origin enriched the Lusi shale with the REE.

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“…δ 13 C allows for the identification of carbon sources and photosynthetic pathways in plants (e.g. C3 and C4 plant differentiation) [5], [6] and to determine enhanced algal productivity [7]. In freshwater systems, organic matter from algal production has a C org /N T ratio from 4 to 10 for cellulose poor and protein rich organic matter, 10 to 20 from aquatic/terrestrial sources and >20 from terrestrial sources (cellulose poor and protein rich organic matter) [3], [7].…”

Section: Research Articlementioning

confidence: 99%

Tracing Anthropogenic Disturbances of a Wetland Through Carbon and Nitrogen Isotope Analyses in Sediments

Pérez-Castillo¹,

Torre²,

Pérez-Rodríguez³

et al. 2017

J. nat. resour. dev.

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Stable Isotope Geochemistry

Cited by 176 publications

References 0 publications

Chloromethane release from carbonaceous meteorite affords new insight into Mars lander findings

Chloromethane release from carbonaceous meteorite affords new insight into Mars lander findings

Rare earth element contents of the Lusi mud: An attempt to identify the environmental origin of the hot mudflow in East Java – Indonesia

Tracing Anthropogenic Disturbances of a Wetland Through Carbon and Nitrogen Isotope Analyses in Sediments

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