Re: [meteorite-list] Conception Junction approved (question)
Carl, this may help: Conversions 1% = 10,000ppm = 10,000ug/g = 10mg/g 10% = 100,000ppm = 100,000ug/g = 100mg/g 100% = 1,000,000ppm = 1,000,000ug/g = 1000mg/g Jim Wooddell - Original Message - From: cdtuc...@cox.net To: meteorite-list@meteoritecentral.com; Laurence Garvie lgar...@cox.net Sent: Sunday, August 28, 2011 8:32 AM Subject: Re: [meteorite-list] Conception Junction approved (question) Laurence, Sorry if this is a stupid question but none of the other pallasites in the bulletin show their data this same way. looking at this data . What does it mean when it says; mg/g etc... Is this milligrams divided by grams? What would the percentage be put in a way that it can be compared with the way others are reported? Geochemistry: Compositional data: Co 6.0 mg/g; Ni 79 mg/g; Ga 24 μg/g; Ge ~80 μg/g; As 29 μg/g; Ir 0.50 μg/g; Au 2.39 μg/g. Data are the mean of duplicate determinations. The composition of the metal differs in detail from other pallasites. For example, the Ir concentration is 0.50 ug/g, with the nearest relative Seymchan at 0.67 μg/g and Barcis at 0.32 μg/g. Classification: On element-Au diagrams, Conception Junction plots distinctly lower than most PMG on Ni and Cu and above most PMG on Co, Ga, As, and Ir diagrams; it is therefore classified as PMG-anomalous (PMG-an). Its Ni and Cu contents are the lowest known for PMG. Its nearest PMG-an neighbor on most diagrams is Krasnojarsk. The low Ni and high Co could reflect unrepresentative sampling of kamacite and taenite but these are the means of two replicates. Thank you. Carl meteoritemax Laurence Garvie lgar...@cox.net wrote: For those that are interested, Conception Junction was approved today. see www.lpi.usra.edu/meteor/metbull.php?code=53877 Laurence CMS ASU __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Conception Junction approved (question)
Laurence, Sorry if this is a stupid question but none of the other pallasites in the bulletin show their data this same way. looking at this data . What does it mean when it says; mg/g etc... Is this milligrams divided by grams? What would the percentage be put in a way that it can be compared with the way others are reported? Geochemistry: Compositional data: Co 6.0 mg/g; Ni 79 mg/g; Ga 24 μg/g; Ge ~80 μg/g; As 29 μg/g; Ir 0.50 μg/g; Au 2.39 μg/g. Data are the mean of duplicate determinations. The composition of the metal differs in detail from other pallasites. For example, the Ir concentration is 0.50 ug/g, with the nearest relative Seymchan at 0.67 μg/g and Barcis at 0.32 μg/g. Classification: On element-Au diagrams, Conception Junction plots distinctly lower than most PMG on Ni and Cu and above most PMG on Co, Ga, As, and Ir diagrams; it is therefore classified as PMG-anomalous (PMG-an). Its Ni and Cu contents are the lowest known for PMG. Its nearest PMG-an neighbor on most diagrams is Krasnojarsk. The low Ni and high Co could reflect unrepresentative sampling of kamacite and taenite but these are the means of two replicates. Thank you. Carl meteoritemax Laurence Garvie lgar...@cox.net wrote: For those that are interested, Conception Junction was approved today. see www.lpi.usra.edu/meteor/metbull.php?code=53877 Laurence CMS ASU __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Conception Junction approved (question)
Carl inquired: none of the other pallasites in the bulletin show their data this same way. What does it mean when it says: mg/g etc. This is milligrams per gram. and: What would the percentage be put in a way that it can be compared with the way others are reported? Well, like this: Ni = 7.9%, Ga = 24 ppm; Ge ~80 ppm; Ir = 0.50 ppm So, it does have a low Ni content (comparable to that of Marjalahti: 7.81% Ni), the iridium value, on the other hand, is remarkably high. Brenham, for example, has an iridium content of only 0.041 ppm. In other words, C.J. has an iridium content 10 times higher than Brenham. Cheers, Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Conception Junction approved (question)
Hi Carl, Yes, mg/g is milligrams per gram and µg/g is micrograms per gram. thus, 6.0 mg/g is 0.6% or 6 ppt (parts per thousand, the analog of percent but based on one-thousandths) and, 24 μg/g is 0.0024% or 24 ppm (parts per million, the analog of percent but based on one million) and If none of the other Pallasites show data that way it is probably because they were published before measurements of trace metals was seen as an important classification tool (at least, in the opinion of Wasson et al). Wasson published a huge paper/review with many tables on the subject comparing many irons and arguing that trace metals are a good classification tool. I am still amazed he has had as good results as he presents, since meteorites are natural materials and variations among traces doesn't seem unlikely, though I am sure others will view the mixing as more uniform (but - if everything was so uniform, for example why do we have more olivines in some slices, or areas of many inclusions, etc, ok ... seeding for crystals an imperfections is a different concept but still ... enough of my monologue - I( am sure he has run many duplicate runs using different sampled sections of material from the same meteorites and found that on balance perhaps even if one metal is off, they can be relatively independent variables - at least some of the metal concwentrations, relative to each other and are useful in separation. Not an easy sell or an easy job, I would have gone bananas with such a project if I had such a monumental task to deal with in a lab. You really got to give him credit. But I still bet there are some nuances in this classification system that will need to be worked out due to the base assumptions of mixing. They will probably be attacked by ratios and appropriately selecting metal element pairs or subgroups. Oh wait, of the 20 US pallasites, the one published to Concepcion Junction was Milton, also of Missouri, in 2000: http://www.lpi.usra.edu/meteor/metbull.php?code=16691 you will notice it is the latest one - same format: Milton Found 2000 October Pallasite A single mass of 2040 g was found in a bean field by Ben Rogers and Gary Wennihan. Initial identification was made by C. Rohs and J. Reese at Northwest Missouri State University. Classification and mineralogy (R. Jones, UNM; J. Wasson, UCLA): Small, angular olivines (73 vol%), mean Fa17.2; molar Fe/Mn = 123; metal composition, Ni = 151 mg/g, Co, 9.6 mg/g, Ga, 15.3 µg/g; As, 10.1 µg/g; Ir, 50.4 µg/g, Au, 1.16 µg/g. Kindest wishers Doug -Original Message- From: cdtuc...@cox.net To: meteorite-list@meteoritecentral.com meteorite-list@meteoritecentral.com; Laurence Garvie lgar...@cox.net Sent: Sun, Aug 28, 2011 11:32 am Subject: Re: [meteorite-list] Conception Junction approved (question) Laurence, Sorry if this is a stupid question but none of the other pallasites in the bulletin show their data this same way. looking at this data . What does it mean when it says; mg/g etc... Is this milligrams divided by grams? What would the percentage be put in a way that it can be compared with the way others are reported? Geochemistry: Compositional data: Co 6.0 mg/g; Ni 79 mg/g; Ga 24 μg/g; Ge ~80 μg/g; As 29 μg/g; Ir 0.50 μg/g; Au 2.39 μg/g. Data are the mean of duplicate determinations. The composition of the metal differs in detail from other pallasites. For example, the Ir concentration is 0.50 ug/g, with the nearest relative Seymchan at 0.67 μg/g and Barcis at 0.32 μg/g. Classification: On element-Au diagrams, Conception Junction plots distinctly lower than most PMG on Ni and Cu and above most PMG on Co, Ga, As, and Ir diagrams; it is therefore classified as PMG-anomalous (PMG-an). Its Ni and Cu contents are the lowest known for PMG. Its nearest PMG-an neighbor on most diagrams is Krasnojarsk. The low Ni and high Co could reflect unrepresentative sampling of kamacite and taenite but these are the means of two replicates. Thank you. Carl meteoritemax Laurence Garvie lgar...@cox.net wrote: For those that are interested, Conception Junction was approved today. see www.lpi.usra.edu/meteor/metbull.php?code=53877 Laurence CMS ASU __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
