Results 1 to 10 of about 14,958 (174)

Petrogenesis and dating of Doran and Shah Bolaghi intrusions: Implications for post-collisional sodic and high-silica granitic magmatism [PDF]

open access: yesپترولوژی, 2022
IntroductionThe Precambrian-Early Cambrian magmatism in Iran includes magmatic rocks in the central, northwestern (e.g. Tekab-Zanjan zone), and northeastern parts of the Iranian plate.
Zahra Badrzadeh, Mehraj Aghazadeh
doaj   +1 more source

Petrography and isotope-geochemistry of the Bayandor Formation dolomites at the type section, south-west of the Zanjan [PDF]

open access: yesJournal of Stratigraphy and Sedimentology Researches, 2019
The Late Precambrian Bayandor Formation has a thickness of 402 m and consists of shale and sandstone with dolomite interlayers (with a thickness of about 2 to 8 m) in the type section of the south-west of Zanjan. Based on fieldwork studies lithofacies of
Sara Pourdivanbeigi Moghaddam   +3 more
doaj   +1 more source

Spectroscopic Insights Into Ferromanganese Crust Formation and Diagenesis

open access: yesGeochemistry, Geophysics, Geosystems, 2020
Marine ferromanganese deposits, often called the scavengers of the sea, adsorb and coprecipitate with a wide range of metals of great interest for paleo‐environmental reconstructions and economic geology.
Kevin M. Sutherland   +3 more
doaj   +1 more source

Geological influence on the formation of Samar natural bridge and collapse valley of Ravna River from the NE Kučaj Mountains (Carpatho-Balkanides, eastern Serbia)

open access: yesActa Carsologica, 2015
The paper deals with the description of Samar natural bridge and collapse valley of Ravna River in eastern Serbia aiming to suggest an interpretation of their origin and development, in relationship with lithological and tectonic conditions, karst ...
Aleksandar Slavisa Petrovic   +1 more
doaj   +1 more source

Gradational development of slaty cleavage to schistosity -an example from the Iberian Pyrite Belt, Spain- [PDF]

open access: yes, 1994
The Iberian Pyrite Belt is an Upper Paleozoic succession which has been divided into the Phyllite-Quartzite Group, the Volcanic-Sliceous Complex and the Culm Group in ascending order from base to the top. The contacts among them are conformable.
Suzuki, shigeyuki
core   +1 more source

Hydrothermal dolomitization in Dengying Formation, Gaoshiti-Moxi area, Sichuan Basin, SW China

open access: yesPetroleum Exploration and Development, 2016
: The formation conditions, existence evidence, modification modes and timing of hydrothermal dolomitization in the Sinian Dengying Formation are studied based on the basic geological conditions, mineral assemblages in dolomites, and geochemical features
Yuqiang Jiang   +7 more
doaj   +1 more source

Primary crustal melt compositions: Insights into the controls, mechanisms and timing of generation from kinetics experiments and melt inclusions [PDF]

open access: yes, 2017
We explore the controls, mechanisms and timing of generation of primary melts and their compositions, and show that the novel studies of melt inclusions in migmatites can provide important insights into the processes of crustal anatexis of a particular ...
Acosta-Vigil, Antonio   +6 more
core   +1 more source

Testing the impact of diagenesis on the delta O-18 and delta C-13 of benthic foraminiferal calcite from a sediment burial depth transect in the equatorial Pacific [PDF]

open access: yes, 2013
Stable oxygen and carbon isotope (δ18O and δ13C) values measured in foraminiferal calcite are one of the primary tools used in paleoceanography. Diagenetic recrystallisation of foraminiferal calcite can act to reset primary isotopic values but its ...
Edgar, Kirsty M.   +2 more
core   +4 more sources

40Ar ∕ 39Ar age constraints on the formation of fluid-rich quartz veins from the NW Rhenohercynian zone (Rursee area, Germany) [PDF]

open access: yesGeochronology
A substantial part of the subsurface geology in northwestern and central Europe is defined by the late Palaeozoic Variscan Orogeny (∼ 350 Ma). Our focus is mainly on veining in anchimetamorphic sedimentary rocks affected by this orogeny.
A. A. O. Huseynov   +3 more
doaj   +1 more source

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