Results 71 to 80 of about 924 (220)

POSSIBLE EVIDENCE FOR THE EXISTENCE OF VOLCANOGENIC MAGMATISM IN THE SINYAYA RIVER BASIN AT THE SOUTHERN FLANK OF THE VILYUI SYNECLISE

Геодинамика и тектонофизика, 2023
The results of different-extension geological survey, exploration and thematic work methods show that the Vilyui syneclise is relatively amagmatic. However, the recent factual evidence in this region indicates the occurrence of magmatism of a different ...
V. V. Baranov, V. S. Grinenko, V. P. Afanasiev, S. S. Ugapieva, N. P. Pokhilenko, N. V. Popov, N. V. Zayakina, T.  I. Vasilieva   +7 more
doaj   +1 more source

Mining and Climate Change Alters Water Storage and Streamflow Dynamics of Northern Peatland‐Dominated Catchments

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, N. E. Balliston, J. S. Price   +2 more
wiley   +1 more source

The Characteristics and Classification of Spinel Group Minerals in Kimberlite in Wafangdian, Liaoning Province

Yankuang ceshi, 2014
According to crystal mineralogy theory, under the diagenetic environments with different physical and chemical conditions, crystal structure and chemical composition of spinel group minerals in kimberlite will be obviously different.
CHI Guang-cheng, WU Yue
doaj   +2 more sources

Shock petrographic and numerical modeling constraints on the morphology and size of the Morokweng impact structure, South Africa

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, S'lindile S. Wela, Auriol S. P. Rae, Marco A. G. Andreoli   +3 more
wiley   +1 more source

Multistep evolution of harzburgitic mantle underneath pipe 200 kimberlite, northern Lesotho: a study on xenoliths and their implication on diamond-barren nature of pipe 200 kimberlite [PDF]

The Pipe 200 kimberlite in northern Lesotho on the southeast margin of the Kaapvaal Craton is a diamond-poor deposit despite its proximity to economically viable kimberlites like the Liqhobong kimberlite.
Fedortchouk Yana, Feichter Monika, Szabó Csaba, Khan Sahroz, Kovács István János, M. Tóth Tivadar   +5 more
core   +1 more source

3‐D Subsurface Geophysical Modeling of the Charity Shoal Structure: A Probable Late Proterozoic‐Early Paleozoic Simple Impact Structure in Eastern Lake Ontario

Earth and Space Science, Volume 11, Issue 11, November 2024.
Abstract The Charity Shoal structure is a circular, ∼1.2‐km‐diameter, bedrock‐rimmed shoal in eastern Lake Ontario with a ∼20‐m‐deep central basin. The structure has been proposed as a possible Middle Ordovician impact crater or volcanic intrusion. We conducted marine seismic and magnetic surveys (9‐km2) and 3‐D geophysical modeling to better resolve ...
Mary H. Armour, Joseph I. Boyce, Phillip Suttak, Doug Hrvoic   +3 more
wiley   +1 more source

Magnetic surface geometry inversion of Kimberlites in Botswana

Geophysical Prospecting, Volume 72, Issue 9, Page 3524-3546, November 2024.
Abstract Surface geometry inversion of geophysical data has recently been introduced as an effective approach for generating surface‐based geological models. The models obtained through surface geometry inversion clearly delineate the contacts between distinct rock units, making them easily interpretable by geologists.
Saeed Vatankhah, Peter G. Lelièvre, Kitso Matende, Kevin Mickus   +3 more
wiley   +1 more source

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  

Hydrogeological features of the field of kimberlite pipe Udachnaya [PDF]

, 2020
The hydrogeological characteristics of the deposits kimberlite pipe Udachnaya are presented, the hydrogeological characteristics of the main aquifer complexes are given. The main source of water cut of the ore bodies are identified.
Fomenko, S. V.
core  

A petrological and geochemical reappraisal of the Mesoproterozoic diamondiferous Majhgawan pipe of central India: evidence for transitional kimberlite – orangeite (group II kimberlite) – lamproite rock type [PDF]

, 2005
The Mesoproterozoic diamondiferous Majhgawan pipe of central India is re-examined in the light of new and recently published petrological, geochemical and isotope data. This investigation reveals that its tectonic setting is similar to that of lamproites
Rao, Chalapathi N. V.
core   +1 more source