scholarly journals Sulfide inclusion Re-Os ages and carbon, nitrogen of diamonds from the Murowa kimberlites: implications for Zimbabwe craton evolution

2019 ◽  
Keyword(s):  
Sulfide Inclusion ◽  
Zimbabwe Craton

Investigation on Manganese Sulfide Inclusion Sizes in 50CrMo4 Steels by means of Fractography, Micrograph Analysis and Immersion Ultrasound

2009 ◽  
Vol 46 (3) ◽  
pp. 123-136
Author(s):  
Cornelius Temmel ◽  
Birger Karlsson ◽  
Ketil Torresvoll ◽  
Christopher Fallqvist
Keyword(s):  
Manganese Sulfide ◽  
Sulfide Inclusion ◽  
Manganese Sulfide Inclusion

The Proterozoic Choma-Kalomo Block, SE Zambia: Exotic terrane or a reworked segment of the Zimbabwe Craton?

2017 ◽  
Vol 298 ◽  
pp. 421-438 ◽  
Author(s):  
Sarah M. Glynn ◽  
Sharad Master ◽  
Michael Wiedenbeck ◽  
Donald W. Davis ◽  
Jan D. Kramers ◽  
...  
Keyword(s):  
Zimbabwe Craton

A terrane interpretation of the Archaean Limpopo Belt

1993 ◽  
Vol 130 (6) ◽  
pp. 755-765 ◽  
Author(s):  
H. R. Rollinson
Keyword(s):  
Shear Zones ◽  
Kaapvaal Craton ◽  
Late Archaean ◽  
The North ◽  
Zimbabwe Craton ◽  
Marginal Zones ◽  
Limpopo Belt

AbstractThe Limpopo Belt is a zone of thickened Archaean crust whose origin is currently explained by a late Archaean continent-continent collision between the Kaapvaal and Zimbabwe cratons. This review shows that the two cratons have fundamentally different geological histories and that the Zimbabwe Craton was unlikely to have behaved as a stable ‘cratonic’ block at the time of the Limpopo Belt collision. The geological histories of the Zimbabwe Craton, the North Marginal, Central and South Marginal zones of the Limpopo Belt and the Kaapvaal Craton are shown to be sufficiently different from one another to warrant their consideration as discrete terranes. The boundaries between the five units outlined above are all major shear zones, further supporting a terrane model for the Limpopo Belt. The five units were all intruded by late- to syn-tectonic granites c.2.6 Ga, constraining the accretion event to c. 2.6 Ga.

Neoarchaean tectonic evolution of the Zimbabwe Craton

2002 ◽  
Vol 199 (1) ◽  
pp. 183-211 ◽  
Author(s):  
Hielke A. Jelsma ◽  
Paul H. G. M. Dirks
Keyword(s):  
Tectonic Evolution ◽  
Zimbabwe Craton

Formation process of sub-micrometer-sized metasomatic platinum-group element-bearing sulfides in a Tahitian harzburgite xenolith

2020 ◽  
Vol 58 (1) ◽  
pp. 99-114
Author(s):  
Norikatsu Akizawa ◽  
Tetsu Kogiso ◽  
Akira Miyake ◽  
Akira Tsuchiyama ◽  
Yohei Igami ◽  
...  
Keyword(s):  
Base Metal ◽  
Formation Process ◽  
Sulfide Inclusion ◽  
Metal Sulfides ◽  
Base Metal Sulfides ◽  
Sulfide Melt ◽  
Platinum Group ◽  
Earth’S Interior ◽  
Micrometer Scale ◽  
Earth's Interior

ABSTRACT Base-metal sulfides (BMSs) are minerals that host platinum-group elements (PGE) in mantle peridotites and significantly control the bulk PGE content. They have been investigated in detail down to the sub-micrometer scale to elucidate PGE behavior in the Earth's interior. Base-metal sulfides are supposedly subjected to supergene and seawater weathering, leading to the redistribution of PGEs at low temperatures. Careful and thorough measurements of BMSs are thus required to elucidate PGE behavior in the Earth's interior. In the present study, a sub-micrometer-sized PGE-bearing sulfide inclusion in a clinopyroxene crystal in a harzburgite xenolith from Tahiti (Society Islands, French Polynesia) was investigated in detail (down to the sub-micrometer scale) using transmission electron microscopy with energy-dispersive X-ray spectroscopy (TEM-EDS). The sulfide inclusion is of carbonatitic metasomatic origin, as it is enveloped by carbonaceous glass, and forms a planar inclusion array with other PGE-bearing sulfide inclusions. The following sulfide phases were identified using TEM-EDS: Fe- and Ni-rich monosulfide solid solutions (MSSs), Fe- and Ni-rich pentlandite, sugakiite, heazlewoodite, chalcopyrite, and Cu-Ir-Pt-Rh-thiospinel (cuproiridsite–malanite–cuprorhodsite). We established the formation process of the metasomatic PGE-bearing sulfide inclusion by considering morphological and mineral characteristics in addition to the chemical composition. A primary MSS first crystallized from metasomatic sulfide melt at ca. 1000 °C, followed by the crystallization of an intermediate solid solution (ISS) below 900 °C. A high-form (high-temperature origin) Fe-rich pentlandite simultaneously crystallized with the primary MSS below ca. 850 °C and recrystallized into a low-form (low-temperature origin) Fe-rich pentlandite below ca. 600 °C. The primary MSS decomposed to Fe- and Ni-rich MSSs, low-form Ni-rich pentlandite, sugakiite, and heazlewoodite. The ISS decomposed to chalcopyrite below ca. 600 °C. Meanwhile, a Cu-Ir-Pt-Rh-thiospinel crystallized directly from the evolved Cu-rich sulfide melt below ca. 760 °C. Thus, Ir, Pt, and Rh preferentially partitioned into the melt phase during the crystallization process of the metasomatic sulfide melt. Metasomatic sulfide melts could be a significant medium for the transport and condensation of Pt together with Ir and Rh during the fractionation process in the Earth's interior. We hypothesize that the compositional variability of PGEs in carbonatites is due to the separation of sulfide melt leading to the loss of PGEs in the carbonatitic melts.

Effects of sulfide inclusion on hydrogen transport in steels

1995 ◽  
Vol 24 (1-3) ◽  
pp. 175-179 ◽  
Author(s):  
W.C. Luu ◽  
J.K. Wu
Keyword(s):  
Sulfide Inclusion ◽  
Hydrogen Transport
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