Results 21 to 30 of about 16,111 (210)

⁸⁷Sr/⁸⁶Sr chemostratigraphy of Neoproterozoic Dalradian limestones of Scotland and Ireland: constraints on depositional ages and time scales [PDF]

, 2004
New calcite ⁸⁷Sr/⁸⁶Sr data for 47 limestones from the metamorphosed and deformed Neoproterozoic-Cambrian Dalradian Supergroup of Scotland and Ireland are used to identify secular trends in seawater <sup>
Fallick, A.E., Robert M. Ellam, Anthony E. Fallick, Graham, C.M., Ellam, R.M., Christopher W. Thomas, Thomas, C.W., Colin M. Graham   +7 more
core   +1 more source

I. Glaciagenic and Related Strata of the Neoproterozoic Kingston Peak Formation in the Panamint Range, Death Valley Region, California. II. The Basal Ediacaran Noonday Formation, Eastern California, and Implications for Laurentian Equivalents. III. Rifting of Southwest Laurentia During the Sturtian-Marinoan Interglacial: The Argenta Orogeny [PDF]

, 2009
I. Glacigenic deposits in the Death Valley region occur within the Neoproterozoic Kingston Peak Formation. In the Panamint Range, immediately west of Death Valley, these strata are ≥1000 m thick and are continuously exposed for nearly 100 km along the ...
Petterson, Ryan
core   +1 more source

Chemostratigraphy of Neoproterozoic carbonates: implications for 'blind dating' [PDF]

, 2001
The delta C-13(carb) and Sr-87/Sr-86 secular variations in Neoproteozoic seawater have been used for the purpose of 'isotope stratigraphy' but there are a number of problems that can preclude its routine use.
Gorokhov, I.M., Fallick, A.E., Anthony E. Fallick, Fallick, A, Igor M. Gorokhov, Kuznetsov, A.B., Victor A. Melezhik, Melezhik, V.A., Anton B. Kuznetsov   +8 more
core   +1 more source

Perspective of gold-bearing deposits in the ferruginous-siliceous formations of Egypt and Kursk Magnetic Anomaly

RUDN Journal of Engineering Research, 2019
Banded ferruginous-siliceous formations (FSF) are confined to the Precambrian basement of the Arabian-Nubian Shield within the central part of the Eastern Desert of Egypt.
Hani E. Sharafeldin, Alexander A. Vercheba   +1 more
doaj   +1 more source

The geology of the Capiru Group, Curitiba Terrane, Southern Ribeira Belt (Brazil)

Journal of Maps, 2021
The Capiru Group is a Neoproterozoic metasedimentary unit that crops out in the Curitiba terrane, Southern Ribeira Belt, Brazil. A detailed geological mapping of this unit was performed during 2016 to 2020. Original interpretations and the new geological
Larissa da Rocha Santos, André Luis Spisila, Daniel Patias Guimarães, Luizemara Szameitat, Alessandra de Barros e Silva Bongiolo, Leonardo Fadel Cury   +5 more
doaj   +1 more source

A Neoproterozoic Transition in the Marine Nitrogen Cycle [PDF]

Current Biology, 2014
The Neoproterozoic (1000-542 million years ago, Mya) was characterized by profound global environmental and evolutionary changes, not least of which included a major rise in atmospheric oxygen concentrations [1, 2], extreme climatic fluctuations and global-scale glaciation [3], and the emergence of metazoan life in the oceans [4, 5].
Sanchez-Baracaldo, Patricia, Ridgwell, Andy J, Raven, John A.   +2 more
openaire   +3 more sources

Structural peculiarities and geodynamic evolution of Taimyr Peninsula in the Neoproterozoic

Литосфера, 2018
Structural relationships between the Neoproterozoic rock complexes of a continental massif, island arc with rear reef and back-arc basin geodynamic affinities are described and considered in this work based on field observations within the northeastern ...
Sergei G. Samygin
doaj   +1 more source

Neoproterozoic copper cycling, and the rise of metazoans [PDF]

Scientific Reports, 2019
AbstractThe rise of animal life is temporally related to the increased availability of oxygen in the hydrosphere and atmosphere during the Neoproterozoic. However, the earliest metazoans probably needed relatively low oxygen concentrations, suggesting additional environmental and/or biochemical developments were involved.
Parnell, J., Boyce, A.J.
openaire   +4 more sources

SOURCES OF LOWER PALEOZOIC SANDSTONES FROM THE NORA-SUKHOTINO TERRANE: RESULTS OF U-Th-Pb AND Lu-Hf ISOTOPE STUDIES OF THE DETRITAL ZIRCONS

Геодинамика и тектонофизика, 2022
This paper presents the results of comprehensive geological and geochemical studies of sandstones from the Belaya basin of the Amur fragment of the Nora-Sukhotino terrane of the northeastern flank of South Mongolia-Khingan orogenic belt, as well as the ...
Y. V. Smirnov
doaj   +1 more source

Neoproterozoic glacial origin of the Great Unconformity [PDF]

Proceedings of the National Academy of Sciences, 2018
The Great Unconformity, a profound gap in Earths stratigraphic record often evident below the base of the Cambrian system, has remained among the most enigmatic field observations in Earth science for over a century. While long associated directly or indirectly with the occurrence of the earliest complex animal fossils, a conclusive explanation for the
Brenhin Keller, C., Husson, Jon M., Mitchell, Ross N., Bottke, William F., Gernon, Thomas M., Boehnke, Patrick, Bell, Elizabeth A., Swanson-Hysell, Nicholas L., Peters, Shanan E.   +8 more
openaire   +6 more sources