Iron and Stony-Iron Meteorites

Haack, H.; McCoy, T. J.

doi:10.1016/b0-08-043751-6/01174-9

Cited by 47 publications

(82 citation statements)

References 158 publications

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“…Measurements of the concentrations of these trace elements form the basis of the classication scheme whereby the number of iron meteorite parent bodies can be determined. 6,7 Trace element variations within individual magmatic iron meteorite groups, thought to have been derived from the same parent body, can provide information on the conditions of formation and the processes of crystallization of metallic cores, and can also be used to estimate cooling rates and hence the original size of the asteroid. 7,8 Trace element analysis of iron meteorites therefore provides important insights into the processes of asteroidal core formation and evolution, and may also aid in understanding the formation and composition of the Earth's inaccessible metallic core.…”

Section: Introductionmentioning

confidence: 99%

Rapid determination of 26 elements in iron meteorites using matrix removal and membrane desolvating quadrupole ICP-MS

Duan

Regelous

2014

J. Anal. At. Spectrom.

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aWe describe a rapid and simple method for determination of major and trace elements ranging in concentration from the percent to the parts per billion level in bulk iron meteorites using a quadrupole inductively coupled plasma mass spectrometer (ICP-MS) operated in solution mode. Contamination of samples during the cutting process is avoided by using a laser to cut samples to an appropriate size. Polyatomic interferences derived from the sample matrix, solvents, and Ar gas are reduced using a membrane desolvation sample introduction system. Interferences derived from the iron-rich sample matrix, in particular interferences of iron oxides with isotopes of Ge, are further reduced by removal of Fe from the sample solution using ion exchange prior to measurement. This method allows the precise and accurate measurement of V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Mo, Ru, Rh, Pd, Cd, In, Sn, Sb, Te, W, Re, Os, Ir, Pt and Au in iron meteorites. After Fe removal, Ge can be accurately measured in IVA and IVB type iron meteorites having Fe/Ge ratios as high as 10 7 , with negligible interference from FeO.Samples subjected to the ion-exchange procedure can be measured at a 10 times lower dilution factor, and as a result, it may also be possible to measure the concentrations of those elements which are preferentially partitioned into the silicate mantle of asteroids, and are therefore present in iron meteorites at sub-ppm concentrations.

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Section: Introductionmentioning

confidence: 99%

Rapid determination of 26 elements in iron meteorites using matrix removal and membrane desolvating quadrupole ICP-MS

Duan

Regelous

2014

J. Anal. At. Spectrom.

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“…Nekateri železovi meteoriti pa so nastali iz delno diferencirane taline, ki se je tvorila pri trkih nediferenciranih mati~nih teles (haaCk & MCCoy, 2004). Železovi meteoriti so tako sestavljeni pretežno iz zlitin železa in niklja, ki tvorijo dva glavna minerala: kamacit z nižjo vsebnostjo niklja (5,4-7,5 mas%) in taenit z vi{jo vsebnostjo niklja (25-65 mas%) (BuChwald, 1977).…”

Section: Meteoritiunclassified

“…Vsaka kemijska skupina naj bi odgovarjala posameznemu mati~nemu telesu oz. asteroidu, saj železovi meteoriti s podobno kemijsko sestavo najverjetneje izvirajo iz istega mati~nega asteroida (BuChwald, 1975;sCott & wasson, 1975;haaCk & MCCoy, 2004;Goldstein et al, 2009). Ker so trendi v vsebnostih slednih prvin znotraj posameznih skupin lahko zelo razli~ni, se skupine nadalje delijo v dva razli~na tipa; magmatski in ne-magmatski (wasson, 1985).…”

Section: Meteoritiunclassified

“…Meteoriti magmatskega tipa tako ve~inoma vsebujejo le kovinsko fazo. Železovi meteoriti ne-magmatskega tipa pa najverjetneje izvirajo iz nediferenciranih mati~nih teles, brez kovinskega jedra (haaCk & MCCoy, 2004), pri katerih je zaradi delnega nataljevanja ob trkih pri{lo le do delne diferenciacije in nastanka posameznih železovih meteoritov (Mittlefehldt et al, 1998;Benedix et al, 2000;wasson & kalleMeyn, 2002). Posledi~no vsebujejo poleg kovinske tudi silikatno fazo (taGle et al, 2003).…”

Section: Meteoritiunclassified

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Two years of the Javorje meteorite investigations

Miler¹,

Gosar²

2012

Geologija

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Klju~ne besede: železov meteorit Javorje, srednji oktaedrit IIIAB, sEM/EDs analiza, mineralna in kemijska sestava, hitrost ohlajanja, Poljanska dolina, slovenijaKey words: iron meteorite Javorje, medium octahedrite IIIAB, sEM/EDs analysis, mineral and chemical composition, cooling rate, Poljane Valley, slovenia Izvle~ekMeteorit Javorje je železov meteorit, natan~neje srednji oktaedrit iz kemijske skupine železovih meteoritov z oznako IIIAB s 7,83-odstotno vsebnostjo niklja. Najden je bil novembra 2009 blizu Javorij v Poljanski dolini. s skoraj petimi kilogrami predstavlja najve~ji in najtežji meteorit, kar so jih doslej na{li na ozemlju slovenije. Namen ~lanka je predstaviti glavne zna~ilnosti meteorita Javorje tudi slovenski geolo{ki javnosti. V ~lanku so povzeti rezultati že objavljene raziskave tega meteorita, dodane pa so nekatere novej{e ugotovitve in podrobnosti o glavnih, akcesornih in sekundarnih mineralih ter o hitrosti ohlajanja. AbstractMeteorite Javorje is a IIIAB medium octahedrite iron meteorite with 7.83 wt% Ni content. It was found in November 2009 near village Javorje in the Poljane Valley. With nearly five kilograms it represents the largest and heaviest meteorite found so far in the territory of slovenia. The purpose of this paper is to present general characteristics of meteorite Javorje to the slovenian geological community. This paper reviews results of already published research of this meteorite and provides some newer findings and details about major, accessory and secondary minerals, and also its cooling rate. UvodMeteorit Javorje je s skoraj petimi kilogrami najve~ji in najtežji meteorit izmed doslej najdenih na ozemlju slovenije, in prav je, da o izsledkih raziskav tega zanimivega predmeta seznanjamo tudi bralce Geologije, osrednje slovenske geolo{ke znanstvene revije. Pred dobrima dvema letoma je v bližini Javorij nad Poljansko dolino, zahodno od Škofje Loke, Vladimir Štibelj povsem po naklju~ju odkril meteorit, ki poleg železovega meteorita Av~e in kamnitega meteorita Jesenice, predstavlja tretji meteorit najden na ozemlju slovenije. Pri gradnji gozdne ceste je pozornost najditelja v novo skopanem cestnem useku na globini 65-70 cm pritegnila nenavadna gmota, ki se je po svojem videzu razlikovala od kamnine in tal v kateri je ležala. Ko jo je vzel v roke, je ugotovil, da je nenavadno težka. V trenutku je bil prepri~an, da je na{el izjemno najdbo in domneval, da je najdeni predmet meteorit. Domnevni meteorit je skrbno shranil ter o najdbi obvestil v Poljanski dolini dobro znanega geologa, nekdanjega sodelavca rudnika urana Žirovski vrh, Pavla A. Florjan~i~a. skupaj sta ugotovila, da je kos kovinski in da mo~no privla~i magnet. seveda pa tudi Pavle A. Florjan~i~ ni mogel brez analiz potrditi, da je najdba res meteorit. Zato sta za pomo~ prosila raziskovalce Geolo{kega zavoda slovenije. raziskave domnevnega meteorita so nam predstavljale velik raziskovalni izziv, saj se do takrat z materialom iz vesolja {e nismo sre~ali. Ko so preliminarne analize z vrsti~nim elektronskim mikroskopom v ...

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“…Interestingly, that achondrites do not have chondrules, which most likely were re-worked during melting, differentiation and alteration processes passed by achondrites. Such facts as extremely high Ir content in IIAB, IIIAB, IVA and IVB irons (from single units up to tens of ppm) [72], very low content of Ir (up to 42 and 69 ppb), and extremely high content of Pd (up to 5.82 and 7.23 ppm) in IIIB irons and pallasites, respectively [73], as well as high content of Ir (up to 1 -2 ppm) in some achondrites-Acapulcoites, Lodranites and Winonaites [74], points at importance of influence of re-working, differentiation and processes of alteration to the final PGE content. These facts clearly prove that chemical composition of CI carbonaceous chondrites may represent only initial composition of part of solar nebula at about 4.5 -4.6 Ga, but it cannot characterize present chemical composition of any matter of CI carbonaceous chondrites, because present chemical composition of PGEs in rocks of Earth's crust and upper mantle depends on the last 4.5 -4.6 Ga of the Earth evolution.…”

Section: On the Formation Of Pges And Pgms And Their Content In Rocksmentioning

confidence: 99%

Concentration of Platinum Group Elements during the Early Earth Evolution: A Review*

Pilchin¹,

Eppelbaum²

2017

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Numerous unique geological processes [1] took place during the early Earth evolution; several of them, especially those occurring in the Hadean-Early Archean and later, are reflected in the modern geological (geophysical, geochemical, etc.) pattern. One such significant enigmatic feature is the preservation of extremely dense and heavy platinum group elements (PGEs): Pt, Pd, Rh, Ru, Ir, Os. Concentration of PGEs during this period could have taken place in two ways: 1) presence of particular matter capable of preserving PGEs near the earth's surface, 2) transportation of PGEs by magma flows from deep lithospheric (asthenospheric) layers (slabs) to the subsurface. Clearly, much of the dense and heavy PGEs did not sink through to the Earth's mantle (core) at the time of the magma-ocean, and occur near Earth's surface in abundances for formation of ore deposits with PGE concentrations found to be 2 -3 orders of magnitude greater than those in their host media. Their enrichments are associated in numerous cases with such enigmatic phenomena as formation of anorthosites and anorthosite-bearing layered magmatic intrusions. PGE deposits and mineralization zones are also found in associations with chromitites, dunites and serpentinites. In this review, problems related to the initial concentration and preservation of PGEs, their association with anorthosites, and formation of layered intrusions are discussed in detail. The main aim of this article is analysis of the requirements-initial concentration and preservation of PGE and PGM (Platinum Group Minerals) during the early Earth evolution, as well as examination of the distribution behavior of some PGEs in different ore deposits and meteorites. It is supposed that meteoritic bombardment of Earth has played a significant role in formation of PGEs deposits. Some conclusions made in this article may be useful for developing and enhancing strategies of prospecting for PGEs deposits.

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Iron and Stony-Iron Meteorites

Cited by 47 publications

References 158 publications

Rapid determination of 26 elements in iron meteorites using matrix removal and membrane desolvating quadrupole ICP-MS

Rapid determination of 26 elements in iron meteorites using matrix removal and membrane desolvating quadrupole ICP-MS

Two years of the Javorje meteorite investigations

Concentration of Platinum Group Elements during the Early Earth Evolution: A Review*

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