samples is given in Table I, from which it is apparent that the composition is variable within each specimen, the CrzO 3 content lying between 4 and 8~o. The latter is high for a muscovite, as most analyses in the literature do not exceed 5 ~ Cr203 unless the mica is phengitic. Thus Rumyantseva et a...

Full description

Bibliographic Details
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.616.2821
http://www.minersoc.org/pages/Archive-MM/Volume_50/50-358-724.pdf
id ftciteseerx:oai:CiteSeerX.psu:10.1.1.616.2821
record_format openpolar
spelling ftciteseerx:oai:CiteSeerX.psu:10.1.1.616.2821 2023-05-15T15:35:48+02:00 The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.616.2821 http://www.minersoc.org/pages/Archive-MM/Volume_50/50-358-724.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.616.2821 http://www.minersoc.org/pages/Archive-MM/Volume_50/50-358-724.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.minersoc.org/pages/Archive-MM/Volume_50/50-358-724.pdf Society for travel funds to B. E. Leake the Chinese text ftciteseerx 2016-01-08T14:45:21Z samples is given in Table I, from which it is apparent that the composition is variable within each specimen, the CrzO 3 content lying between 4 and 8~o. The latter is high for a muscovite, as most analyses in the literature do not exceed 5 ~ Cr203 unless the mica is phengitic. Thus Rumyantseva et al. (1984) report 17.93 ~ Cr20 3 but with only 4.00 ~o A1203 and 51.70 ~o SiO2 (i.e. Si: A122: 1) in a chromium phengite. Deer et al. (1962) report the highest Cr20 3 on record up to that date as 6.08 ~o (Whitmore et al., 1964). The association of the present fuchsite matches best with the ankerite-quartz-sulphide-gold grouping of Whitmore t al. (1946) although the carbonate isnot ankerite. The high content of K in the fushsite means that even if the modal proportions of the mineral were only 0.5 ~, the K content of the rock, assuming no other mineral contains K, would be 0.055 ~ K20, which is too high to be derived isochemically from most ultramafic igneous rocks (Wedepohl, 1969). The implication is that some K was introduced in the fluids that carbonated the original igneous rock. The relatively high Ni content of the fuchsite, reaching a maximum of over 1 ~o NiO is also unusual and is linked with a small phengitic substitution giving the highest ratio of Si:A1 of 1.60: 1 which is still a long way from the 3: I lowest ratio of phengite (Deer et at., 1962). Ni is a relatively unusual component of muscovites but was pre-sumably derived from the original ultramafic rock. The variegated green colour of the virginite therefore largely derives from the composition of the breunnerite with a small contribution from the unusually high, but varied, Cr content of the fuchsite. It seems likely that a more extensive s arch in the Baie Verte fracture zone would identify fuchsite with even more Cr and Ni. Text Baie Verte Unknown Baie Verte ENVELOPE(-56.182,-56.182,49.933,49.933) Verte ENVELOPE(141.192,141.192,-66.740,-66.740)
institution Open Polar
collection Unknown
op_collection_id ftciteseerx
language English
topic Society for travel funds to B. E. Leake
the Chinese
spellingShingle Society for travel funds to B. E. Leake
the Chinese
topic_facet Society for travel funds to B. E. Leake
the Chinese
description samples is given in Table I, from which it is apparent that the composition is variable within each specimen, the CrzO 3 content lying between 4 and 8~o. The latter is high for a muscovite, as most analyses in the literature do not exceed 5 ~ Cr203 unless the mica is phengitic. Thus Rumyantseva et al. (1984) report 17.93 ~ Cr20 3 but with only 4.00 ~o A1203 and 51.70 ~o SiO2 (i.e. Si: A122: 1) in a chromium phengite. Deer et al. (1962) report the highest Cr20 3 on record up to that date as 6.08 ~o (Whitmore et al., 1964). The association of the present fuchsite matches best with the ankerite-quartz-sulphide-gold grouping of Whitmore t al. (1946) although the carbonate isnot ankerite. The high content of K in the fushsite means that even if the modal proportions of the mineral were only 0.5 ~, the K content of the rock, assuming no other mineral contains K, would be 0.055 ~ K20, which is too high to be derived isochemically from most ultramafic igneous rocks (Wedepohl, 1969). The implication is that some K was introduced in the fluids that carbonated the original igneous rock. The relatively high Ni content of the fuchsite, reaching a maximum of over 1 ~o NiO is also unusual and is linked with a small phengitic substitution giving the highest ratio of Si:A1 of 1.60: 1 which is still a long way from the 3: I lowest ratio of phengite (Deer et at., 1962). Ni is a relatively unusual component of muscovites but was pre-sumably derived from the original ultramafic rock. The variegated green colour of the virginite therefore largely derives from the composition of the breunnerite with a small contribution from the unusually high, but varied, Cr content of the fuchsite. It seems likely that a more extensive s arch in the Baie Verte fracture zone would identify fuchsite with even more Cr and Ni.
author2 The Pennsylvania State University CiteSeerX Archives
format Text
url http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.616.2821
http://www.minersoc.org/pages/Archive-MM/Volume_50/50-358-724.pdf
long_lat ENVELOPE(-56.182,-56.182,49.933,49.933)
ENVELOPE(141.192,141.192,-66.740,-66.740)
geographic Baie Verte
Verte
geographic_facet Baie Verte
Verte
genre Baie Verte
genre_facet Baie Verte
op_source http://www.minersoc.org/pages/Archive-MM/Volume_50/50-358-724.pdf
op_relation http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.616.2821
http://www.minersoc.org/pages/Archive-MM/Volume_50/50-358-724.pdf
op_rights Metadata may be used without restrictions as long as the oai identifier remains attached to it.
_version_ 1766366137302384640