Results 81 to 90 of about 27,666 (260)

Formation and Alteration of Olivine‐Carbonate Rocks Within Jezero Crater as Constrained by In Situ Visible/Near‐Infrared Multispectral Images

open access: yesJournal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Olivine‐ and carbonate‐bearing rocks are key exploration targets on Mars because of the information they can provide about magma evolution and source characteristics, implications for surface water availability and climate, and their biosignature preservation potential.
E. Ravanis   +16 more
wiley   +1 more source

Four-Hundred-and-Ninety-Million-Year Record of Bacteriogenic Iron Oxide Precipitation at Sea-Floor Hydrothermal Vents [PDF]

open access: yes, 2004
Fe oxide deposits are commonly found at hydrothermal vent sites at mid-ocean ridge and back-arc sea floor spreading centers, seamounts associated with these spreading centers, and intra-plate seamounts, and can cover extensive areas of the seafloor ...
Alt JC   +15 more
core   +1 more source

Cenozoic Evolution of the North‐Eastern Mediterranean Basins

open access: yesTectonics, Volume 45, Issue 1, January 2026.
Abstract The Eastern Mediterranean lies at the junction of the African, Arabian, and Eurasian plates, a region shaped by a long and complex tectonic history. While the Levant Basin in the southern sector has been extensively studied for hydrocarbon exploration, the northern domain offshore Cyprus, Turkey, Syria, and Lebanon remains less understood.
Nicolò Bertone   +6 more
wiley   +1 more source

Formation and emplacement of the Josephine ophiolite and the Nevadan orogeny in the Klamath Mountains, California-Oregon: U/Pb zircon and ^(40)Ar/^(39)Ar geochronology [PDF]

open access: yes, 1994
Cordilleran ophiolites typically occur as basement for accreted terranes. In the Klamath Mountains, ophiolitic terranes were progressively accreted by underthrusting beneath North America. The Josephine ophiolite is the youngest of the Klamath ophiolites
Harper, Gregory D.   +2 more
core   +1 more source

Geochemistry and U–Pb Zircon Geochronology of Granite at the Pilok Sn–W Deposit, Thailand: Implications for Late Triassic Tin Metallogenesis

open access: yesResource Geology, Volume 76, Issue 1, January‐December 2026.
Zircon U–Pb dating constrains the Pilok Sn–W granite emplacement at 212–208 Ma, during the Late Triassic post‐collisional extension after the Sibumasu‐Indochina collision. This timing coincides with widespread tin‐bearing granite magmatism throughout Southeast Asia, marking a major regional metallogenic event. ABSTRACT The Pilok Sn–W deposit in western
Mallika Intachai   +8 more
wiley   +1 more source

Application of imaging spectrometer data to the Kings-Kaweah ophiolite melange [PDF]

open access: yes
The Kings-Kaweah ophiolite melange in east-central California is thought to be an obducted oceanic fracture zone and provides the rare opportunity to examine in detail the complex nature of this type of terrain.
Mustard, John F., Pieters, Carle M.
core   +1 more source

Chromitite deposits of Ufaley ultramafic massif (South Urals)

open access: yesGeoresursy
Data on the morphology, composition, textural and structural features of chromite deposits of the Ufaley ultramafic massif are presented. The mineralogical and compositional features of the host ultramafic rocks allow us to interpret them as depleted ...
D. E. Saveliev
doaj   +1 more source

Fossilized Endolithic Microorganisms in Pillow Lavas from the Troodos Ophiolite, Cyprus

open access: yesGeosciences, 2019
The last decade has revealed the igneous oceanic crust to host a more abundant and diverse biota than previously expected. These underexplored rock-hosted deep ecosystems dominated Earth’s biosphere prior to plants colonized land in the Ordovician,
Diana-Thean Carlsson   +2 more
doaj   +1 more source

Platinum-group element mineralisation in the Unst ophiolite, Shetland [PDF]

open access: yes, 1984
The ophiolitic basic and ultrabasic rocks of the island of Unst, Shetland comprise a sequence of harzburgites, dunites, clinopyroxene-rich cumulates, and gabbro, within tectonic blocks that have been thrust over a migmatite complex during the Laxer ...
Gunn, A.G., Leake, R.C., Styles, M.T.
core  

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