Results 21 to 30 of about 2,123 (183)

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

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

Fibrous dolomite formation at a Miocene methane seep may reflect Neoproterozoic aragonite-dolomite sea conditions

Communications Earth & Environment, 2023
Fibrous dolomite widely formed in Neoproterozoic marine sedimentary environments, but apparently disappeared in the Phanerozoic. Here, fibrous dolomite is recognised in a Miocene methane seep limestone (Marmorito, Italy) by synchrotron X-ray diffraction,
Yang Lu, Carsten Paulmann, Boriana Mihailova, Thomas Malcherek, Daniel Birgel, Matthias López Correa, Zhiyong Lin, Liuyi Lu, Yvonne Milker, Jörn Peckmann   +9 more
doaj   +1 more source

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

Nova 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

Research progresses on glacial erosion and Neoproterozoic glacial erosion forms

Dizhi 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, KUANG Hongwei, LIU Yongqing, WANG Yuchong, PENG Nan, XU Huan   +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

Tektonika, 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, Israel Polonio, Luis Rojo   +2 more
doaj   +1 more source

Neoproterozoic geochronology and provenance of the Adelaide Superbasin

Precambrian Research, 2020
Abstract The Adelaide Superbasin (Adelaide Rift Complex, Stuart Shelf, Torrens Hinge Zone, Coombalarnie Platform, and Cambrian Stansbury and Arrowie Basins) is a vast sedimentary basin in southern Australia that initiated due to the break-up of central Rodinia and, evolved into the Australian passive margin on edge of the Pacific Basin.
Collins, Alan, Hall, James, Blades, Morgan, Hore, Stephen, Shahin, Sameh, Wade, Ben, Counts, John, Ball, Ashleigh, Amos, Kathryn, Drabsch, Matthew, Lloyd, Jarred   +10 more
openaire   +3 more sources

Notable Impact of Paleotectonic Stress on Gold Mineralisation in the West Qinling Orogen

Geological Journal, EarlyView.
By applying fuzzy clustering and multiple inverse methods, we systematically processed the data of vein and fault slip in this ore deposit to reveal the transition of orogenic geological environment and paleotectonic stress field. Our research results show two different stress states: the northwest–southeast extensional stress field and the northeast ...
Hongyan Wang, Aibing Chen, Jian Yang, Yuan Zhang   +3 more
wiley   +1 more source

A users guide to Neoproterozoic geochronology

, 2017
Geochronology is essential for understanding Neoproterozoic Earth history. Here we review the types of rocks and minerals that are used to date geologic events and the analytical protocols for the different radio-isotopic decay systems employed. We discuss the limitations and potential of these methodologies for dating Neoproterozoic stratigraphy ...
Condon, Daniel, Bowring, Samuel
openaire   +3 more sources

THE NEOPROTEROZOIC ISLAND-ARC ASSOCIATION OF THE MUKODEK GOLD-ORE FIELD, NORTHERN BAIKAL AREA

Геодинамика и тектонофизика, 2015
Metamorphosed volcanic rocks of the Ushmukan suite were studied in the Mukodek gold-ore field located in the Baikal-Muya belt in the Northern Baikal area, Russia. The Ushmukan suite shows interleaving of ortoschists which compositions are widely variable.
V. A. Vanin, D. P. Gladkochub, T. V. Donskaya   +2 more
doaj   +1 more source