ORCID Profile
0000-0001-6405-8795
Current Organisation
Livsmedelsverket
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Geochemistry | Isotope Geochemistry | Extraterrestrial Geology
Publisher: Elsevier BV
Date: 03-2022
Publisher: Informa UK Limited
Date: 03-2012
Publisher: Springer Science and Business Media LLC
Date: 11-2013
DOI: 10.1038/NATURE12764
Abstract: The ancient cratered terrain of the southern highlands of Mars is thought to hold clues to the planet's early differentiation, but until now no meteoritic regolith breccias have been recovered from Mars. Here we show that the meteorite Northwest Africa (NWA) 7533 (paired with meteorite NWA 7034) is a polymict breccia consisting of a fine-grained interclast matrix containing clasts of igneous-textured rocks and fine-grained clast-laden impact melt rocks. High abundances of meteoritic siderophiles (for ex le nickel and iridium) found throughout the rock reach a level in the fine-grained portions equivalent to 5 per cent CI chondritic input, which is comparable to the highest levels found in lunar breccias. Furthermore, analyses of three leucocratic monzonite clasts show a correlation between nickel, iridium and magnesium consistent with differentiation from impact melts. Compositionally, all the fine-grained material is alkalic basalt, chemically identical (except for sulphur, chlorine and zinc) to soils from Gusev crater. Thus, we propose that NWA 7533 is a Martian regolith breccia. It contains zircons for which we measured an age of 4,428 ± 25 million years, which were later disturbed 1,712 ± 85 million years ago. This evidence for early crustal differentiation implies that the Martian crust, and its volatile inventory, formed in about the first 100 million years of Martian history, coeval with earliest crust formation on the Moon and the Earth. In addition, incompatible element abundances in clast-laden impact melt rocks and interclast matrix provide a geochemical estimate of the average thickness of the Martian crust (50 kilometres) comparable to that estimated geophysically.
Publisher: Geological Society of London
Date: 19-08-2009
Publisher: Wiley
Date: 13-08-2018
DOI: 10.1111/MAPS.13185
Publisher: Elsevier BV
Date: 08-2013
Publisher: Wiley
Date: 20-11-2014
DOI: 10.1111/MAPS.12395
Publisher: Wiley
Date: 19-11-2008
Publisher: EDP Sciences
Date: 2011
DOI: 10.2113/GSSGFBULL.182.1.5
Abstract: Upper Carboniferous heating and melting of the middle orogenic crust associated with the emplacement of syntectonic granitoids are documented in the Upper Gneissic Unit of the Livradois area (central part of the French Massif Central). Crustal melting post-dates peak metamorphism conditions (800-625°C, 10-8 kb) dated at 360 ± 4 Ma (U-Th-Pb on monazite). The P-T evolution of the metamorphic series indicates that Barrovian metamorphism was followed by a decompression (from 10 ± 1 kbar to 6 ± 1 kbar) associated with either a decrease in temperature in the southern part of the series or with an increase in temperature (of about 150°C) in the northern part of the series. This evolution records the first step of the exhumation of the series coeval with granitoids intrusion, of which the emplacements were dated at 315 ± 4 and 311 ± 18 Ma (U-Pb on zircon). The final stage of the exhumation is associated with an isobaric cooling of the whole series. Similarity of 40Ar/39Ar ages for biotite in the paragneisses (307-300 Ma) and K-feldspar in the granitoids (306-300 Ma) document rapid cooling for this stage. Moreover dextral reverse mylonites, at the border and the northern part of the metamorphic series indicate north-south compression coeval with the unroofing of the series. Youngest 40Ar-39Ar ages on K-feldspar (274.6 ± 5 Ma) combined with normal shearing in mylonites limiting the Carboniferous Brassac-les-Mines basin document the late Carboniferous-early Permian stage of extension coeval with the upwelling of the Velay granitic dome.
Publisher: Elsevier BV
Date: 02-2016
Publisher: Wiley
Date: 07-12-2015
DOI: 10.1111/MAPS.12572
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 05-2011
Publisher: American Geophysical Union (AGU)
Date: 10-2013
DOI: 10.1002/JGRE.20167
Publisher: Wiley
Date: 17-02-2017
DOI: 10.1111/MAPS.12835
Publisher: Mineralogical Society of America
Date: 02-2010
DOI: 10.2138/AM.2010.3297
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 04-2011
Publisher: Elsevier BV
Date: 11-2016
Publisher: Oxford University Press (OUP)
Date: 30-04-2010
Publisher: Elsevier BV
Date: 06-2015
Publisher: Wiley
Date: 25-10-2016
DOI: 10.1111/MAPS.12740
Publisher: Wiley
Date: 16-12-2011
Publisher: Elsevier BV
Date: 05-2009
Publisher: Elsevier BV
Date: 15-03-2010
Publisher: Wiley
Date: 11-2009
Publisher: Elsevier BV
Date: 03-2019
Publisher: Springer Science and Business Media LLC
Date: 11-04-2010
Publisher: Elsevier BV
Date: 04-2021
Publisher: Wiley
Date: 20-11-2015
DOI: 10.1111/MAPS.12565
Publisher: Springer Science and Business Media LLC
Date: 24-08-2014
DOI: 10.1038/NGEO2231
Start Date: 2012
End Date: 2014
Funder: Australian Research Council
View Funded ActivityStart Date: 02-2012
End Date: 06-2015
Amount: $210,000.00
Funder: Australian Research Council
View Funded Activity