Results 51 to 60 of about 5,620 (262)
ESTONIAN GRAPTOLITIC ARGILLITES – ANCIENT ORES OR FUTURE FUELS?; pp. 530–539 [PDF]
Oil Shale, 2009 The Estonian black argillites formed in Late Cambrian and Early Ordovician (Tremadoc) just after the Cambrian evolutionary explosion, nicely illustrated by the famous Burgess shales.
Endel Lippmaa +3 more
doaj +1 more source
Chemistry of Jurassic/Cretaceous black shales
, 2003 Black shale samples of Jurassic to Cretaceous age recovered during the 'Norwegian Shelf Drilling Program' between 1987 and 1991 from Sites 7430/10-U-01 (Barents Sea), 6814/04-U-02 (Norwegian Shelf near the Lofoten) and 6307/07-U-02 (Norwegian Shelf near ...
Hans-Jürgen Brumsack (6959459) +5 more
core +1 more source
Journal of Raman Spectroscopy, EarlyView.Micrometer analysis of millimeter lines of Raman spectra concludes in the association of anatase and graphitized organic matter (graphogen). The photosynthetic microorganisms at the origin of the microbialites produce O2, which is transformed by TiO2 into reactive species that, in turn, decompose the organic matter of the microorganisms. ABSTRACT Raman
Marie‐Paule Bassez
wiley +1 more source
International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.ABSTRACT Numerical simulation of hydraulic fracturing remains challenging due to the strong coupling between geomechanics and fluid flow when modelling multiple physical mechanisms of rock deformation, fracture evolution and fluid leak‐off. This study develops a coupled hydraulic fracture propagation framework that combines the extended finite element ...
Ran Tao, Juliana Y. Leung, Samer Adeeb
wiley +1 more source
Permafrost Distribution in the Canadian Rockies: Key Variables Influencing Patch‐Scale Variability
Permafrost and Periglacial Processes, EarlyView.ABSTRACT The spatial distribution of permafrost in mountainous regions is influenced by various factors such as topography, climate, vegetation, and substrate. Despite the existence of comprehensive permafrost maps at national and global levels, they fail to accurately represent the patch‐scale (e.g., < 25 m) permafrost distribution in characteristic ...
Gerardo Zegers +2 more
wiley +1 more source
Permafrost and Periglacial Processes, EarlyView.ABSTRACT Using a large and novel array of instruments on five rockwalls in northern Gaspesia, their respective surface energy balances were calculated and their thermal regimes were measured and modeled to depths exceeding the seasonal frost penetration.
Tom Birien, Francis Gauthier
wiley +1 more source
, 1979 (Table 3) Relative distribution of normal and isoprenoid alkanes in oils of bitumen A from black shales of the Cape Verde Basin in DSDP Hole 41 ...
L I Bogolyubova (6886124) +3 more
core +1 more source
Permafrost and Periglacial Processes, EarlyView.ABSTRACT Due to its subsurface nature, permafrost cannot be directly observed with the naked eye or optical remote sensing. Consequently, accurately describing its distribution and thermal state is challenging. This is especially true in vast, remote environments, where obtaining comprehensive field data is demanding or improbable.
Ria Nicholson +5 more
wiley +1 more source
Mid-Cretaceous paleoenvironmental changes in the western Tethys [PDF]
Climate of the Past, 2018 We present a continuous record of surface water temperature and fertility variations through the latest Barremian–Cenomanian interval (ca. 27 Myr) based on calcareous nannofossil abundances from the western Tethys.
C. Bottini, E. Erba
doaj +1 more source
Introduction to geochemistry of metalliferous black shales [PDF]
Chemical Geology, 1992 1. Metalliferous black shales Metalliferous black shales exhibit a wide range of physical and chemical characteristics. They can be enriched in many different metals, and the metals can be in a variety of geochemical states. Depositional and geological histories of these shales are diverse.
Meyers, Philip A. +2 more
openaire +2 more sources