Results 91 to 100 of about 7,253 (231)

Rb-Sr and Sm-Nd concentration and isotope ratios of samples from the Tiger Gabbro complex, Spatulate Ridge and Apostrophe Island [PDF]

, 2014
Rb-Sr and Sm-Nd concentration and isotope ratios of samples from the Tiger Gabbro complex, Spatulate Ridge and Apostrophe ...
Kosanke, Dominique, Glen Phillips (2845310), Estrada, Solveig, Phillips, Glen, Henjes-Kunst, Friedhelm, Dominique Kosanke (6960266), Andreas L Läufer (6960260), Solveig Estrada (6960263), Friedhelm Henjes-Kunst (6960254), Koepke, Jürgen, Jürgen Koepke (6960257), Piepjohn, Karsten, Karsten Piepjohn (4036178), Läufer, Andreas   +13 more
core   +1 more source

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

Borehole Waters From Hole U1601C (Atlantis Massif) Provide Constraints for a Deep‐Sourced Formation Water That (Could) Feed the Lost City Hydrothermal Field

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.
Abstract Hole U1601C, drilled during International Ocean Discovery Program (IODP) Expedition 399, reached a depth of 1,268 m below the seafloor (mbsf) in the Atlantis Massif (30°N, 42°W). This borehole represents only one of six boreholes that extends more than 700 m into oceanic rock, penetrating predominantly ultramafic lithologies, mostly composed ...
C. Geoffrey Wheat, Susan Q. Lang, Gordon Southam, Will Osborne, Ivan P. Savov, Samuele Agostini, Jordan Poitras   +6 more
wiley   +1 more source

Clayters Beach - Granite-gabbro magma mixing [PDF]

, 2019
Clayters Beach - Granite-gabbro magma mixinghttps://digitalmaine.com/mgs_geologic_field_photos/6154/thumbnail ...
Marvinney, Robert G
core  

Paleomagnetism of the 1180 Ma Grenvillian Umfraville gabbro, Ontario [PDF]

, 1978
The 1180 ± 20 Ma Umfraville gabbro is a slightly metamorphosed stock in the Grenville Province. It was sampled at 17 sites (183 specimens). After alternating field and thermal demagnetization the gabbro retains the same very stable remanent ...
D. T. A. Symons
core   +1 more source

Variable Sr Diffusion and Implications for Rb–Sr Biotite Geochronology

Journal of Metamorphic Geology, Volume 44, Issue 6, Page 417-439, July 2026.
ABSTRACT The rubidium–strontium (Rb–Sr) system has a long pedigree as a geochronological tool that relies on the application of an isochron approach. In particular, biotite contains strongly radiogenic Rb–Sr isotopes, and thus can yield meaningful crystallisation or cooling ages via this approach. However, the response of the Rb–Sr system in biotite to
Riley Rohrer, Christopher L. Kirkland, Hugo Olierook, Tim Johnson, Katy Evans   +4 more
wiley   +1 more source

Polymict melt‐bearing breccia dikes in the Morokweng impact structure formed by slip‐induced mechanical mixing of pseudotachylite and cataclasite along large‐displacement impact faults

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1288-1308, July 2026.
Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson, S'lindile S. Wela, Leonidas C. Vonopartis, Marco A. G. Andreoli   +3 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

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1263-1287, July 2026.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta, Neivaldo Araújo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferrière, Wolf Uwe Reimold, Ana Maria Góes, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco   +9 more
wiley   +1 more source

Granite-gabbro mixing zone near Norton Pt. [PDF]

, 2019
Granite-gabbro mixing zone near Norton Pt.https://digitalmaine.com/mgs_geologic_field_photos/6168/thumbnail ...
Marvinney, Robert G
core