Results 61 to 70 of about 9,445 (214)

Lanes Island - Older gabbro cut by granite-gabbro mixing zone.

, 2019
Lanes Island - Older gabbro cut by granite-gabbro mixing zone.https://digitalmaine.com/mgs_geologic_field_photos/6183/thumbnail ...
Marvinney, Robert G
core  

Bulk rock composition from the Tiger Gabbro complex from Dragontail Hills (Spatulate Ridge) and Apostrophe Island, Antarctica

, 2014
Bulk rock composition from the Tiger Gabbro complex from Dragontail Hills (Spatulate Ridge) and Apostrophe Island ...
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

Porous and Permeable Crystalline Basement: Evidence for Large‐Scale Hydraulic Connectivity at Kivetty, Finland

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract Porosity and permeability in crystalline shield basement are commonly assumed to be low, yet some fault zones sustain fluid circulation over kilometer scales. Here we quantify multiscale fault‐zone connectivity at Kivetty, central Finland, by integrating legacy deep‐borehole data, including packer tests, downhole logs, and a long‐term multi ...
Daniel Carbajal‐Martínez, Michael J. Heap, Ester M. Jolis, Toni Luoto, Thierry Reuschlé, Satu Vuoriainen, Jukka Kuva, Evgenii Kortunov, Alan Bischoff   +8 more
wiley   +1 more source

Lanes Island - Older gabbro intruded by granite-gabbro mixing zone.

, 2019
Lanes Island - Older gabbro intruded by granite-gabbro mixing zone.https://digitalmaine.com/mgs_geologic_field_photos/6182/thumbnail ...
Marvinney, Robert G
core  

Gabbros from IODP Site 1256, equatorial Pacific: Insight into axial magma chamber processes at fast spreading ocean ridges

Geochemistry, Geophysics, Geosystems, 2011
The ODP/IODP multileg campaign at ODP Site 1256 (Cocos plate, eastern equatorial Pacific) provides the first continuous in situ sampling of fast spreading ocean crust from the extrusive lavas, through the sheeted dikes and down into the uppermost gabbros.
J. Koepke, L. France, T. Müller, F. Faure, N. Goetze, W. Dziony, B. Ildefonse   +6 more
doaj   +1 more source

Evaluating Forced Versus Plume‐Induced Subduction Initiation for the Talkeetna‐Bonanza Arc System: Implications for Permo‐Triassic Paleogeography of the North American Cordillera

Tectonics, Volume 45, Issue 9, September 2026.
Abstract The mechanisms by which new subduction zones form remain highly debated. Here we use Permo‐Triassic strata to evaluate potential mechanisms for initiation of the Talkeetna‐Bonanza Arc of the northern North American Cordillera. New mapping and analysis of Permian and Upper Triassic strata on the Alaska Peninsula suggest a period of uplift ...
Brandon M. Keough, Michael P. Eddy, Kenneth D. Ridgway   +2 more
wiley   +1 more source

Alkali gabbro fragments in Sudbury breccia

, 1990
Alkali gabbro fragments in Sudbury breccia have been misinterpreted as potash-enriched greywacke. Because of differing proportions of arenaceous and argillaceous components, greywackes vary widely in chemical composition. However, on plots of SiO2/Al2O3
R. E. S. Whitehead, J. F. Davies, L. Dupuis   +2 more
core   +1 more source

Petrogenesis and Tectonic Evolution of Cenozoic Magmatism in the Southernmost Northern Andes: Insights From Zircon Petrochronology

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.
Abstract This study integrates new zircon U–Pb ages, zircon εHf(t)–δ18O isotopic data, and whole‐rock geochemistry to refine the temporal and spatial framework of magmatism in the southern Northern Andes (SNA) from ∼65 to 6 Ma. The San Lucas, Catamayo, Portachuela, and Gonzanamá batholiths and magmatic suites, along with Late Miocene plutons, display ...
J. Iglesias, C. Witt, L. C. Sandoval Espinel, M. Zattin, M. Poujol, O. Bruguier, O. Poma, M. J. Hernández, O. Averbuch, M. Seyler, D. Bosch, F. Chanier, S. Ventalon, C. Liorzou, V. Bosse   +14 more
wiley   +1 more source

Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints

Open Geosciences, 2017
We examined the petrography, petrology, and geochemistry of two types of gabbroic xenoliths (A- and B-type xenoliths) in olivine basalt and biotite rhyolite units among the dominantly rhyolitic rocks in Niijima volcano, northern Izu-Bonin volcanic arc ...
Arakawa Yoji, Endo Daisuke, Ikehata Kei, Oshika Junya, Shinmura Taro, Mori Yasushi   +5 more
doaj   +1 more source

Clayters Beach - Older fractured gabbro cut by granite-gabbro mixing zone.

, 2019
Clayters Beach - Older fractured gabbro cut by granite-gabbro mixing zone.https://digitalmaine.com/mgs_geologic_field_photos/6158/thumbnail ...
Marvinney, Robert G
core