Results 51 to 60 of about 3,252 (193)

Reappraisal of the Continental Rifting and Seafloor Spreading That Formed the South China Sea

open access: yesGeosciences
Recently published marine geophysical and seafloor drilling data permit a substantive reappraisal of the rifting and spreading that formed the South China Sea (SCS).
Brian Taylor
doaj   +1 more source

Magmatic tritium [PDF]

open access: yes, 1997
This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory. Detailed geochemical sampling of high-temperature fumaroles, background water, and fresh magmatic products from 14 active volcanoes reveal that they do not produce measurable amounts of tritium ({sup 3}H) of deep ...
Goff, F.   +6 more
openaire   +2 more sources

Discovery of bauxite-type helium source rock in Jinzhong basin, central North China and its resource potential evaluation

open access: yesChina Geology, 2023
Qiao Zhang   +8 more
doaj   +1 more source

Riphean magmatism and ore formation, preceding the disclosure of the Uralian Paleoocean (western slope of the Southern Urals)

open access: yesЛитосфера, 2017
The analysis of the evolution of composition and mineral occurences of the Low and Middle Riphean magma-tic rocks from the riftogenic structures of the Bashkirian anticlinorium involving of some neighboring structures from the western slope of the ...
V. V. Holodnov   +3 more
doaj   +2 more sources

Neogene-Quaternary magmatic activity and its geodynamic implications in the Central Mediterranean region

open access: yesAnnals of Geophysics, 1997
The petrogenesis and time/space distribution of the magmatism associated with the formation of the Northern and Southern Tyrrhenian basins, together with the directions and ages of lithospheric extension and/or spreading north and south of the 410N ...
G. Serri
doaj   +1 more source

Flux Modulated Magmatic Architecture in Continental Magmatic Arcs

open access: yes
Petrochronology of the magmatic reservoir that underpinned the Chaxas Volcanic Complex for the duration of its 8.59 – 1.24 Ma lifecycle reveals that magmatic architecture can be regulated by magmatic flux. Modulation of the magmatic reservoir was controlled via two distinct flux regimes during the Pre-Chaxas and Chaxas Complex stages of the Chaxas ...
Charles Lewis, Shan de Silva
openaire   +1 more source

To the problem of origin volcanoplutonic processes

open access: yesМінеральні ресурси України
In the article from the position on the Concept of the Dynamics of the Earth’s Crust Evolution (CDECE) the problems of the origin of volcanoplutonic processes and related endogenous ore formation are considered.
A. T. Akhverdiev
doaj   +1 more source

OIB‐Type Garnet Amphibolites From the Xuerongzangbu Area, Central Lhasa Terrane, Tibet: Implications for Songduo Paleo‐Tethys Ocean Evolution and Permian Mantle Activity Along North Gondwana

open access: yesGeochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.
Abstract Whether the Songduo metamorphic belt represents an in situ Paleo‐Tethyan suture within the Lhasa Terrane or far‐traveled allochthonous high‐pressure slices, and how Permian mantle activity along the North Gondwana margin relates to subsequent Tethyan evolution, remain central questions in Tibetan tectonics.
Yuan‐Bo Ma   +9 more
wiley   +1 more source

Evolution of melts and fluids during the crust and mantle formation in Neo-Archean—Paleo-Proterozoic. Stratigraphic effects

open access: yesГеофизический журнал, 2016
Evolution of composition of Precambrian magmatic and metamorphic rocks is related to directional change of deep fluids. It makes possible to use material composition of rocks as a sign for correlation.
O.V. Usenko
doaj   +1 more source

Apatite as a Proxy for Reconstructing Magma Mixing Histories in Granitoids

open access: yesGeochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.
Abstract Apatite is a common accessory mineral in granites and mafic microgranular enclaves (MMEs), and its textural and compositional characteristics can record dynamic magmatic evolution processes. Apatites from the Early Cretaceous Sanguliu granite and its MMEs in the Liaodong Peninsula exhibit pronounced compositional heterogeneities. In this study,
Xiaowen Lin, Jiahao Zheng, Wanyi Feng
wiley   +1 more source

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