Results 61 to 70 of about 2,573 (214)
Titanoclinohumite: A possible mineralogical site for water in the upper mantle [PDF]
, 1970 Titanium-rich clinohumite and layered structure minerals are observed in kimberlite and as inclusions in pyropic garnets from the Moses Rock dike, a kimberlite-bearing breccia dike in San Juan County, Utah.
Chodos, A. A. +2 more
core +1 more source
Geochemistry, Geophysics, Geosystems, Volume 26, Issue 3, March 2025.Abstract Major and trace elements, including H2O, were determined in garnet and clinopyroxene to constrain the evolution of mantle xenoliths from Diavik, Canada. The 20 samples, derived from 120 to 220 (240) km depth, define a geotherm equivalent to 37 mW/m2 surface heat flow and include three eclogite (A, B, C) and two pyroxenite (B, C) types (A: High
Esther Schmädicke +2 more
wiley +1 more source
An ion microprobe U-Th-Pb study of zircon xenocrysts from the Lahtojoki kimberlite pipe, eastern Finland [PDF]
Bulletin of the Geological Society of Finland, 2001 Eleven relatively large (diameter 1–2 mm) zircon grains extracted from the Lahtojoki kimberlite pipe (Eastern Finland Kimberlite Province) have been analysed by the ion microprobe NORDSIM for their U- and Pb- isotopic composition.
P. Peltonen, I. Mänttäri
doaj +1 more source
Review of South African research on volcanic and related rocks and mantle-derived materials : 1999-2002 [PDF]
, 2003 This report reviews South African research relating to the scientific interests of the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) and which was published between 1999 and 2002.
Marsh, J S
core +1 more source
Water Resources Research, Volume 60, Issue 12, December 2024.Abstract The Hudson Bay Lowlands (HBL) of northern Ontario, a globally significant carbon store, are characterized by expansive peatland complexes of patterned bogs and fens, which play a vital role in regional water regulation. These peatlands are threatened by disturbance from large‐scale resource extraction and projected climate change, both of ...
O. F. Sutton +2 more
wiley +1 more source
Cretaceous fossils from the Orapa Diamond Mine [PDF]
, 1997 Main articleThe Orapa kimberlite pipe, situated in north-central Botswana, is well-known for its rich reserves of diamonds. It is indeed one of the largest and richest diamond mines in the world.
Bamford, M. K. +6 more
core
Platinum-group element contents of Karelian kimberlites: implications for the PGE budget of the sub-continental lithospheric mantle [PDF]
, 2017 We present high-precision isotope dilution data for Os, Ir, Ru, Pt, Pd and Re in Group I and Group II kimberlites from the Karelian craton, as well as 2 samples of the Premier Group I kimberlite pipe from the Kaapvaal craton. The samples have, on average,
Barnes, Sarah-Jane +3 more
core +2 more sources
Meteoritics &Planetary Science, Volume 59, Issue 12, Page 3250-3281, December 2024.Abstract The 369 m deep M4 drill hole, located ~18 km NNW of the center of the 146 Ma Morokweng impact structure (MIS), intersects shocked Archean granitoid gneisses and subsidiary dolerite intrusions that are cut by faults, cataclasites and mm‐ to m‐wide suevitic and pseudotachylitic breccia dikes.
Roger L. Gibson +3 more
wiley +1 more source
Specific features of kimberlites of Mirny field (Sibirian platform)
Известия высших учебных заведений: Геология и разведка, 2019 Results of comparative complex investigation are provided for diamonds from primary bodies of Mirny kimberlite field, among which three groups are distinguished sharply differing by typomorphic features of crystals, related with three separated in time ...
N. N. Zinchuk, V. I. Koptil
doaj +1 more source
The provenance of Borneo's enigmatic alluvial diamonds:A case study from Cempaka, SE Kalimantan [PDF]
, 2016 Gem-quality diamonds have been found in several alluvial deposits across central and southern Borneo. Borneo has been a known source of diamonds for centuries, but the location of their primary igneous source remains enigmatic.
Atkinson +112 more
core +2 more sources