...Yu. P. Barashkov; S. B. Talnikova Under discussion are results of a comparative study of compositions of initial sulfide substance in diamonds and kimberlite minerals. Calculated from Me/S, the compositions of initial sulfides in diamonds, olivines, and garnets are subdivided into: (1) monosulfide...

...V.P. Afanas’ev; E.I. Nikolenko; N.S. Tychkov; A.T. Titov; A.V. Tolstov; V.P. Kornilova; N.V. Sobolev Abstract The relative abrasive stability of kimberlite indicator minerals such as pyrope, picroilmenite, olivine, and apatite as well as diamonds and kimberlite fragments was studied experimentally...

... Mineralogical Society of America Yimengite hawthorneite magnetoplumbite-group minerals crichtonite-group minerals Ti-oxide xenolith mantle metasomatism Udachnaya kimberlite pipe During recent decades, mantle-derived titanates have received increased attention due to their capability...

... is 4.3582(5) g/cm 3 for botuobinskite and 4.3867 (3) g/cm 3 for mirnyite. botuobinskite mirnyite new mineral crichtonite group inclusion pyrope kimberlite Internatsionalnaya pipe Siberian craton The crichtonite group includes a series of complex Fe–Ti-rich oxides (also V-rich...

... and petrochemical characteristics of the breccia making up the intrusion and the composition of the indicator minerals confirm that it is a group I kimberlite. During ascent to the crust, the kimberlite magma which formed the CL-25 Pipe sampled a large portion of the lithosphere beginning from depths corresponding...

...Z. V. Spetsius; W. L. Griffin The results of investigation of trace element abundance in rock-forming garnet and clinopyroxene as well as oxide and sulfide minerals of eclogite xenoliths from the Udachnaya kimberlite pipe are presented. Investigated samples have been chosen from different varieties...

... are interpreted to have formed, along with the other members of the silicate megacryst assemblage, from a fractionating, mantle-derived liquid at about 150 km depth within the temperature interval of 1165°–1390° C (Stage I of kimberlite development). Subsequently, the minerals experienced a sudden increase...

...Nabil Z. Boctor; F. R. Boyd Abstract The oxide minerals in kimberlite from Liqhobong, Lesotho, are represented by discrete ilmenite nodules, groundmass ilmenite, spinel solid solutions, and perovskite. The discrete ilmenite nodules have margins that are enriched in Mg (15–21 weight percent MgO...

... and its constituent minerals reveal this highly serpentinized microbreccia contains a primary mineral assemblage consisting of olivine (Mg/Mg+Fe), 87 to 93), orthopyroxene and clinopyroxene (falling into two compositional ranges after correction for Na-pyroxene molecules—one with A1 2 O 3 between 0.5...

...S. Anashkin; A. Bovkun; L. Bindi; V. Garanin; Y. Litvin Abstract Kudryavtsevaite, ideally Na 3 MgFe 3+ Ti 4 O 12 , is a new mineral from kimberlitic rocks of the Orapa area, Botswana. It occurs as rare prismatic crystals, up to 100 μm across, associated with Mg-rich ilmenite, freudenbergite...

... of the world, (2) independence of their distribution from the distribution of indicator kimberlite minerals and diamonds (Kurung Cr-spinellide might associate with kimberlite minerals in sediments, but more often they occur separately), and (3) their absence from the world-wide known kimberlite bodies...

... in the interior of southern Africa. In addition to the diamonds, other kimberlite derived minerals such as ilmenite and garnet have also been recovered from these gravels. Detailed mineral chemical analyses of the ilmenites and those occurring in primary sources within a radius of 120 km of the Mahura Muthla area...

..., in the lower Proterozoic, is designated the Jequitai glaciation; the second, probably in the Cambrian, is represented by the Santa Fe tillites; and the third, in the Carboniferous, is represented by the Itarare Subgroup. These glaciations with the capacity to transport kimberlitic minerals and diamonds intact...

...Peter H. Nixon; Oleg von Knorring; Joan M. Rooke Abstract Mineralogical and chemical data of some Basutoland (South Africa) kimberlites are presented. The minerals fall into three groups, viz., those belonging to kimberlite proper, those of the ultrabasic nodules and those of the eclogite-granulite...

...Fig. 1. Localization of Middle Paleozoic kimberlite mineral haloes on the Siberian Platform. 1–3 — Middle Paleozoic haloes mainly of pyrope ( 1 ) and pyrope-picroilmenite ( 2 ) compositions and sites of findings of KIM ( 3 ) in the Middle-Late Paleozoic deposits (halo numbers follow Table 1...

...J. B. Dawson Abstract New developments since Wyllie's (1967) book include new discoveries (India, USSR); observations on zoning of xenoliths in pipes; a newmineral (amakinite) and several minerals reported from kimberlite for the first time; new data on composition and geochemistry of kimberlite...

...N. V. Sobolev; E. S. Yefimova; L. F. Reimers; O. D. Zakharchenko; A. I. Makhin; L. V. Usova We have studied a representative collection of 174 crystals of diamonds with mineral inclusions selected from five diamondiferous pipes from the Zolotitsky field of the Arkhangelsk kimberlite province (AKP...

... in kimberlites is genetically related to diamond. The finds of Mn-ilmenite known before in kimberlitic and related rocks are late- or postmagmatic, metasomatic phases. They either form reaction rims on grains of picroilmenite or other ore minerals, or compose laths in groundmass. In contrast to those finds, Mn...

...A.E. MOORE Abstract Kimberlite and lamproite exploration programmes have traditionally been underpinned by systematic sampling programmes, aimed at identifying anomalous concentrations of kimberlite indicator minerals (KIMs) proximal to the host rocks. These “pathfinders”, which typically include...