Results 41 to 50 of about 29,296 (274)

Tectonic evolution of the Qinling Orogenic Belt, Central China – new evidence from geochemical, zircon (U-pb) geochronology and HF isotopes

open access: yesNova Geodesia, 2022
The paper deals with a review of tectonic evolution in different regions of China with the help of different techniques and models. Tectonic evolution shows that in the shallow layers of China the structural impact is not solid, and huge structural ...
Nusrat NAZIR, Liu YANG, Zhang CHENGJUN
doaj   +1 more source

Paleomagnetism of Upper Vendian sediments from the Winter Coast, White Sea region, Russia: Implications for the paleogeography of Baltica during Neoproterozoic times [PDF]

open access: yes, 2002
Paleomagnetic results from an Upper Vendian sedimentary sequence exposed along the White Sea shoreline, NW Russia are described. These classical exposures have been the subject of intense paleontological investigations due to their well-preserved ...
Iosifidi, A.   +9 more
core   +1 more source

Age constraints on Precambrian glaciations and the subdivision of Neoproterozoic time [PDF]

open access: yes, 2005
Age constraints on Precambrian glaciations and the subdivision of Neoproterozoic timeA review of age constraints on the Neoproterozoic glaciations suggests that at least four distinct glacial events can be recognised, three of which appear to be global.

core   +1 more source

Remarkable preservation of microbial mats in Neoproterozoic siliciclastic settings : Implications for Ediacaran taphonomic models [PDF]

open access: yes, 2009
The authors thank Duncan McIlroy and Alex Liu for their discussions, help, comments and field support, the National Trust for access to Longmyndian localities, and the staff of the British Geological Survey Palaeontology unit and the Oxford University ...
Callow, Richard H. T.   +4 more
core   +1 more source

Research progresses on glacial erosion and Neoproterozoic glacial erosion forms

open access: yesDizhi lixue xuebao
Objective  Glacial erosion forms serve as crucial bases for reconstructing the laws of glacial movement and transport-deposition processes in geological history.
CHEN Xiaoshuai   +5 more
doaj   +1 more source

Timanian Fold-and-Thrust Belt and Caledonian Overprint in the Selis Ridge Imaged by New 3D Seismic Attributes and Spectral Decomposition

open access: yesTektonika, 2023
The present study is a detailed structural analysis of 3D seismic data in the Selis Ridge in the western Loppa High in the Norwegian Barents Sea, to which new seismic attributes and spectral decomposition were applied.
Jean-Baptiste Koehl   +2 more
doaj   +1 more source

From Highlands to Henge: Refining the Provenance and Transport Pathways of Stonehenge's Altar Stone

open access: yesJournal of Quaternary Science, EarlyView.
ABSTRACT The Altar Stone, the 6000 kg central sandstone megalith at Stonehenge in southern England, is suggested to have originated from the Orcadian Basin in northeast Scotland, some 700 km away. However, its source location within this large basin remains unresolved and its mode of transport uncertain.
Anthony J. I. Clarke   +8 more
wiley   +1 more source

Geochemical Characteristics and Their Geological Significance of Zircon and Apatite From the Wunugetushan Porphyry Cu–Mo Deposit, Inner Mongolia, NE China

open access: yesActa Geologica Sinica - English Edition, EarlyView.
The key factors making the monzogranitic porphyry fertile for mineralization, including its high Cl, S, and H2O contents, high oxidation state, significant fluid exsolution, and multiple recharges of deep‐seated mafic magma, were all critical for the formation of the Wunugetushan porphyry Cu‐Mo deposit. ABSTRACT The Wunugetushan (Wushan) porphyry Cu–Mo
Genyuan JI   +4 more
wiley   +1 more source

Middle Neoproterozoic syn-rifting volcanic rocks in Guangfeng, South China: petrogenesis and tectonic significance [PDF]

open access: yes, 2008
Middle Neoproterozoic igneous rocks are widespread in South China, but their petrogenesis and tectonic implications are still highly controversial.
Li, W.   +5 more
core   +1 more source

Geological constraints on Neoproterozoic glacial episodes

open access: yes, 2023
Neoproterozoic glacial episodes are amongst the most intense glaciations that the Earth has experienced, and are associated with major changes in the Earth System, such as the breakup of a supercontinent, the evolution of complex multicellular life and ...

core   +1 more source

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