Results 51 to 60 of about 8,608 (219)

A new, ~4500‐year varve record and high‐resolution tephrochronology from lake Hämälänlampi, eastern Finland, provides age constraints for the Furnas C and the Glen Garry/Askja A‐2000 eruptions

Journal of Quaternary Science, EarlyView.
ABSTRACT The northern European distal cryptotephra framework is constantly developing both in terms of identification of new tephra horizons and improved age constraints for the already well‐established tephra marker horizons. However, many prehistoric tephra layers have only been dated by the radiocarbon method, with its inherent problems.
Maarit Kalliokoski, Veera Erola, Saija Saarni   +2 more
wiley   +1 more source

Analysis of carbonate tempestite deposits of the Kangan Formation in the central Persian Gulf [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2018
This study focuses on fining-upward sequences of carbonate-evaporite series of the Kangan Formation in the central Persian Gulf area. The studied sequences shows a typical succession of tempestite deposits.
Vahid Tavakoli
doaj   +1 more source

The origin of fine scale acoustic stratigraphy in deep-sea carbonates [PDF]

, 1979
In this paper we investigate the origin and geologic significance of the closely spaced high-frequency subbottom acoustic reflectors characteristic of pelagic carbonates.
Mayer, Larry A.
core   +2 more sources

Confirmation of the impact origin of the Late Ordovician Tvären impact structure (southeast Sweden) and emplacement of impactites in a marine setting

Meteoritics &Planetary Science, EarlyView.
Abstract The Tvären structure in southeastern Sweden has been listed as a confirmed marine‐target impact structure for decades. However, to date, no measurements and/or indexed data of planar deformation features in quartz grains from the structure have been published or any other unequivocal evidence of impact.
Katarzyna J. Gajewska, Sanna Alwmark, Mikael Calner, Sylvain Richoz, Jens Ormö, Erik Sturkell, Carl Alwmark   +6 more
wiley   +1 more source

The depression type of the Upper Visean-Serpukhovian succession in the Subpolar Urals

Литосфера, 2015
The Upper Visean-Serpukhovian deep-water shelf succession is described in the Subpolar Urals. Turbidite model of the sequence forming and direction of the carbonate material transport are proposed. The bioherm and shoal facial belt of the shelf margin is
D. B. Sobolev, A. V. Zhuravlev, V. V. Popov, Ya. A. Vevel   +3 more
doaj   +2 more sources

The role of mechanical stratigraphy on the refraction of strike-slip faults [PDF]

Solid Earth, 2019
Fault and fracture planes (FFPs) affecting multilayer sequences can be significantly refracted at layer–layer interfaces due to the different mechanical properties of the contiguous layers, such as shear strength, friction coefficient and grain size ...
M. Carlini, G. Viola, J. Mattila, L. Castellucci   +3 more
doaj   +1 more source

Report and preliminary results of SONNE cruise SO175, Miami - Bremerhaven, 12.11 - 30.12.2003 : (GAP, Gibraltar Arc Processes) [PDF]

, 2004
Expedition SO175 using FS Sonne aimed for a multidisciplinerary geoscientific approach with an international group of researchers. Methods covered the entire span from geophysical data acquisition (seafloor mapping, echography, seismic reflection ...
Bannert, Bernhard, Brückmann, Warner, Dorschel, Boris, Foubert, Anneleen T. G., Grevemeyer, Ingo, Gutscher, Marc-André, Hebbeln, Dierk, Heesemann, Bernd, Hensen, Christian, Kaul, Norbert Emanuel, Kopf, Achim, Lutz, Marco, Magalhaes, Victor Hugo da Silva, Marquardt, Matthias Jonathan, Marti, Alexis V., Nass, Kristin Sabrina, Neubert, Nadja, Niemann, Helge, Nuzzo, Marianne, Poort, Jeffrey Pepijn Dylan, Rosiak, Uwe Dieter, Sahling, Heiko, Schneider von Deimling, Jens, Somoza Losada, Luis, Thiebot, Emanuelle, Wilkop, Thomas Peter   +25 more
core  

A review of the supercritical state of eruption‐fed volcanic density currents in subaerial and subaqueous settings

Sedimentology, EarlyView.
ABSTRACT Subaerial Pyroclastic Density Currents (PDCs) and Subaqueous Eruption‐Fed Density Currents (SEFDCs) produced during volcanic eruptions can present major hazards to surrounding communities and ecosystems. The bedforms deposited by these volcanic density currents can provide insights into the nature of transport and depositional processes, which
Shannon E. Frey, Martin Jutzeler, Rebecca J. Carey   +2 more
wiley   +1 more source

Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China

Earth Sciences Research Journal, 2018
Through a range of petrological techniques, the petrology, diagenesis, pore characteristics, and controlling factors on the regional variations of reservoir quality of the Chang 7 sandstones were studied. These sandstones, mainly arkoses, lithic arkoses,
Haihua Zhu, Guangchen Liu, Dakang Zhong, Tingshan Zhang, Jun Lang, Jingli Yao   +5 more
doaj   +1 more source

Tracking sea bed topography in the Jurassic. The Lotena Group in the Sierra de la Vaca Muerta (Neuquén Basin, Argentina) [PDF]

, 2005
The Lotena Group is a clastic to evaporitic unit up to 650 m thick that accumulated during the Middle to Late Jurassic in the Neuquén Basin, western Argentina.
Zavala, Carlos Alberto
core   +1 more source