Results 81 to 90 of about 657 (209)
Ancient Craton‐Wide Mid‐Lithosphere Discontinuity Controlled by Pargasite Channels
Geophysical Research Letters, Volume 51, Issue 9, 16 May 2024.Abstract The mechanisms governing a commonly observed seismic velocity drop in the cratonic lithosphere, referred to as the mid‐lithospheric discontinuity (MLD), have been widely debated. To identify the composition and seismic structure of MLDs, we have analyzed Sp receiver functions (SRF) and mantle xenocrysts for six regions across Australia.
Z. J. Sudholz +6 more
wiley +1 more source
A study of unusual diamonds from the George Creek K1 Kimberlite dyke, Colorado
, 1995 Cathodoluminescence photomicrographs of diamonds from the George Creek Kl (section 28) kimberlite dyke in Colorado reveal complex intergrowth relationships between CO?-free and CO?-bearing diamond growth generations.
Chinn, Ingrid Lee
core
Time constraints on the formation of lithospheric mantle beneath cratons: a re-Os isotope and platinum group element study of peridotite xenoliths from northern Canada and Lesotho, [PDF]
, 2001 Understanding the generation and evolution of cratonic lithospheric keels requires detailed knowledge of their age, timescale of formation, and the relationship between the crust and mantle part of the lithosphere.
Irvine, Gordon James
core
Kimberlite Volcanology: Transport, Ascent, and Eruption [PDF]
, 2019 Kimberlite rocks and deposits are the eruption products of volatile-rich, silica-poor ultrabasic magmas that originate as small-degree mantle melts at depths in excess of 200 km.
Kavanagh, Janine +2 more
core +1 more source
Specific Internal Structure of Diamonds from Zarnitsa Kimberlite Pipe
Crystals, 2017 The Zarnitsa kimberlite pipe is one of the largest pipes of the Yakutian diamondiferous province. Currently, some limited published data exists on the diamonds from this deposit.
Alexey Ragozin +3 more
doaj +1 more source
Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite
Geochemistry, Geophysics, Geosystems, Volume 25, Issue 4, April 2024.Abstract Sedimentary carbonates are known to be carried into the deep mantle by subducted slabs, and studies on mantle‐derived magmas have attempted to trace the recycled carbonate in their mantle source. However, the final depth of storage of recycled carbonate and the role of recycled carbonate in the partial melting of mantle remain controversial ...
Bowen Wei +8 more
wiley +1 more source
The geology of the Singida kimberlite pipes, Tanganyika
, 1962 Fifty-four kimberlite pipes and dykes cut Precambrian granite in the Singida region of Tanganyika. The pipes range from 60 to 2500 feet in diameter, and occur in clusters and lines. The lines follow fracture zones.
Mannard, George W.
core
Crystals, 2020 In this paper, we report a spectroscopic study of natural type Ib-IaA diamonds containing Y centers subjected to high-pressure high-temperature treatment at 7–7.5 GPa and 1700–2200 °C.
Igor N. Kupriyanov +3 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, Volume 25, Issue 1, January 2024.Abstract The Northern Tanzanian Divergence in the East Africa Rift is arguably the best place on Earth to study the controls on rifting of thick lithosphere. Here, where the East Africa Rift intersects the Tanzanian Craton and the Mozambique Belt, the relationships between volcanism, faulting, pre‐existing structures and lithospheric thickness and ...
Sinan Özaydın +6 more
wiley +1 more source
Following kimberlite indicator minerals to source in the Chidliak Kimberlite Province, Nunavut
, 2013 The discovery of diamond-bearing kimberlite within the Chidliak kimberlite province on Hall Peninsula, southern Baffin Island, Nunavut, is a classic example of the application of traditional diamond-exploration techniques in a glaciated terrain. To date,
H Grenon +4 more
core +1 more source