Results 41 to 50 of about 146 (130)

Correlative Tomography for Polymineralic Inclusion Composition in Sublithospheric Diamonds

Geophysical Research Letters, Volume 52, Issue 11, 16 June 2025.
Abstract Sublithospheric diamonds and their inclusions are the deepest known samples from the Earth's mantle. Typically, the inclusions are trapped as minerals which are only stable in the deep mantle, retrogressing into multiple phases during their uplift. Determining the bulk inclusion composition is difficult but crucially important.
B. D. Rayner, S. C. Kohn, R. J. Garwood, A. D. Burnham, G. P. Bulanova, C. B. Smith, A. R. Thomson   +6 more
wiley   +1 more source

Deformation Controlled Fluid Mass‐Transfer Processes in Ancient Orogens

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract Despite abundant empirical evidence, the details of coupled deformation and mass transfer processes within a framework of the crustal architecture of ancient orogens remains enigmatic. Geophysical imaging of the Larder Lake‐Cadillac deformation zone, a well‐endowed crustal‐scale fault system in the Superior Province of the Canadian Shield ...
G. J. Hill, B. M. Frieman, E. A. Roots, P. E. Wannamaker, V. Maris, R. Haugaard, J. Kamm, R. Klanica, S. Kovacikova, A. J. Calvert, J. A. Craven, R. S. Smith   +11 more
wiley   +1 more source

A FIRST REPORT ON THE ROLE OF TRACE ELEMENT PEDOGEOCHEMISTRY IN DIAMOND EXPLORATION- AN EXAMPLE FROM LATTAVARAM KIMBERLITE CLUSTER, SOUTHERN INDIA

Geochimica Brasiliensis, 2018
Trends in a concentration of selected trace elements in residual soils on four known diamondiferous kimberlite pipes (3, 4, 8 and 9) occurring at Lattavaram within the Wajrakarur Kimberlite Field (WKF) is attempted for the first time.
Rameshchandra Phani Pothuri
doaj   +1 more source

ABOUT LITHOMINERALOGICAL COMPOSITION OF ANCIENT SEDIMENTARY DIAMONDIFEROUS ROCKS

Известия высших учебных заведений: Геология и разведка, 2018
Litho-mineralogical and structural-formation generation features of Upper Devonian-Carboniferous crusts of weathering on terrigenous-carbonate rocks, kimberlites and deposits enriched by products of their redeposition, have been studied, that allowed ...
N. N. Zinchuk
doaj   +1 more source

Water in Eclogite and Pyroxenite Xenoliths From the Bottom 100 km of the Slave Craton (Canada) Mantle Root

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, Jürgen Gose, Thomas Stachel   +2 more
wiley   +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

Petrography and mineral chemistry of Rosário-16 Kimberlite: an inference of P, T, and fO2 for an ultramafic alkaline assemblage in Southern Brazil [PDF]

Brazilian Journal of Geology
Rosário-16 (R-16) is a hypabyssal transitional kimberlite, divided into two volcanic pipes, R-16-A and R-16-B, within the Kimberlite Province of Rosário do Sul (KPRS), southeast of the Paraná Basin (PB), southeast Brazil. The saprolite outcrops, within a
Andrea Brum da Silva, Larissa Colombo Carniel, Rommulo Vieira Conceição, Gláucia Nascimento Queiroga, Andrea Sander, Marco Paulo de Castro   +5 more
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

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

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