Results 61 to 70 of about 24,652 (211)

Petrogenesis and tectonic setting of the proto-tethyan dachaidan ophiolite, North China: insights from clinopyroxene chemistry and whole-rock Sr–Nd–Pb and zircon Hf isotopes

Frontiers in Earth Science
IntroductionThe Dachaidan ophiolites outcrop within an ultrahigh-pressure metamorphic belt along the northern margin of the Qaidam Basin. However, their age, source, and tectonic setting remain still in debate.MethodIn this study, we investigated the ...
Yilin Qu, Yilin Qu, Xijun Liu, Xijun Liu, Xijun Liu, Xijun Liu, Xiao Liu, Xiao Liu, Xiao Liu, Qianwen Huang, Qianwen Huang, Qijun Yang, Rongguo Hu, Rongguo Hu, Rongguo Hu, Pengde Liu, Yujia Song   +16 more
doaj   +1 more source

From Implement to Outcrop: a model for identifying implement source rock at outcrop

Internet Archaeology, 2009
Traditionally, the sourcing of prehistoric stone tools in Britain has been done most successfully by comparing the petrological and geochemical characteristics of individual stone tools with rock and debitage from known prehistoric quarry sites and stone
Amy Davis, Vin Davis, Mik Markham
doaj   +1 more source

Rethinking Collinearity in Self‐Organizing Maps: Evidence From Geophysical Data Classification

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 2, April 2026.
Abstract This study examines the impact of collinearity on unsupervised machine learning algorithms (UMLAs), specifically Self‐Organizing Maps (SOMs), for detecting lithological boundaries in geophysical data. Using a multi‐scale experimental framework that includes bivariate isotropic clusters, geologically complex Noddy simulations, and real‐world ...
Limin Xu, Leonardo Feltrin, Eleanor C. R. Green   +2 more
wiley   +1 more source

Analysis of structural features and geometrization of qualitative properties of gabbroic rocks of the eastern part of the Volodarsk-Volynskyi massif of basic rocks of the Korosten pluton

Технічна інженерія
The paper deals with the geometrization of gabbroids of the eastern part of the Volodarsk-Volynskyi massif of basic rocks of the Korosten pluton on the basis of determining the spatial location, structure and interrelations of crystalline rock types. The
A.O. Kryvoruchko, V.V. Kotenko, S.A. Horshkalov, H.V. Brui   +3 more
doaj   +1 more source

GEOCHRONOLOGY OF ALKALINE ROCKS FROM THE BURPALA MASSIF (NORTHERN PRIBAIKALYE): NEW U-Pb DATA

Геодинамика и тектонофизика
Geochronological studies have been made on the main types of rocks from the Burpala alkaline massif and two gabbro and gabbro-diorite dikes located nearby.
I. А. Izbrodin, А. G. Doroshkevich, А. V. Malyutina, D. V. Semenova, Т. А. Radomskaya, М. N. Kruk, I. R. Prokopyev, А. Е. Starikova, М. О. Rampilov   +8 more
doaj   +1 more source

Global Comparison of Aqueous Geochemistry and Dissolved H2/CH4 in Continental Low Temperature Serpentinization–Influenced Environments

Hydrological Processes, Volume 40, Issue 3, March 2026.
Conceptual diagram of hydrological and geochemical processes within the Santa Elena Ophiolite, Costa Rica. It highlights watershed cross‐sections, soil genesis, hyperalkaline Type II waters (pH > 11.6) with calcite crust and trapped H2/CH4 gases, seepage into surface waters, storm‐impacted stream profiles, weathered vs.
Alexandra May, Ricardo Sánchez‐Murillo, Matthew O. Schrenk, Esteban Gazel, J. Maarten de Moor, Christian Birkel, Xiaoqiang Li, Danelle Carr, María Marta Chavarría   +8 more
wiley   +1 more source

The Pobei Cu-Ni and Fe ore deposits in NW China are comagmatic evolution products: evidence from ore microscopy, zircon U-Pb chronology and geochemistry

Geologica Acta, 2017
The Pobei mafic-ultramafic complex in northwestern China comprises magmatic Cu-Ni sulfide ore deposits coexisting with Fe-Ti oxide deposits. The Poshi, Poyi, and Podong ultramafic intrusions host the Cu-Ni ore. The ultramafic intrusions experienced four
Y.G. LIU, W.Y. LI, X.B. LÜ, Y.H. HUO, B. ZHANG   +4 more
doaj  

Initiation of the Ferrar Large Igneous Province Started in Southern North Victoria Land, Antarctica, With Shallow Emplacement of Sills Causing Magma‐Soft‐Rock Interaction and Phreatomagmatic Eruptions

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
Early Jurassic volcanism was in the southern north Victoria Land portion of the Ferrar Large Igneous Province preceded by multiple phases of shallow‐level intrusions of Ferrar sills into the 300 m thick cover of sedimentary rocks of the Triassic‐Jurassic Victoria Group.
Lothar G. Viereck, Jörg Büchner, Robert Schöner, Jörg W. Schneider, Benjamin Bomfleur, Jan Tympel, Ricarda Hanemann, Axel Gerdes   +7 more
wiley   +1 more source

Geometrization of structural elements of the Southern section of the Bystriyivske gabbro deposit to determine rational directions of development

Технічна інженерія
The article deals with the issue of geometrization of structural elements of a gabbro deposit in order to improve the processes of its geological and economic assessment and determine the optimal directions of development.
V.G. Levytskyi, A.O. Kryvoruchko, G.V. Skyba, S.V. Kalchuk, S.M. Shyshko   +4 more
doaj   +1 more source

Petrography and bulk composition of Miller Range 05035: a new lunar VLT gabbro [PDF]

, 2007
Miller Range (MIL) 05035 is a crystalline lunar mare gabbroic meteorite collected in Antarctica in 2005 [1]. It is an important new sample in the lunar meteorite (LM) collection as it is only one of ~8 to be classified as basaltic in nature. MIL 05035 is
Anand, M., Crawford, I. A., Joy, K. H., Russell, S. S.   +3 more
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