Results 81 to 90 of about 673,502 (223)

Olivine–gabbroic shergottites: A petrogenetic link between poikilitic and gabbroic shergottites

Meteoritics &Planetary Science, EarlyView.
Abstract Shergottites span a textural, mineralogical, and geochemical range, and finding links between the various petrologic and geochemical groups is of great interest as it provides insight into the conditions of the Martian interior. Here, we compare the texture, mineralogy, mineral chemistry, and geochemistry of REE‐enriched intrusive shergottite ...
S. Benaroya, J. Gross
wiley   +1 more source

Biogeochemical characterization of micritized carbonate grains in the shallow‐marine Al‐Kharrar Lagoon (Red Sea, Saudi Arabia)

Sedimentology, EarlyView.
ABSTRACT Micritization of marine carbonate grains is an early diagenetic process involving the alteration of the original carbonate fabric and the formation of cryptocrystalline textures through cycles of dissolution and reprecipitation. Microorganisms play a significant role in this process, actively contributing to the formation of constructive and ...
Camila Areias, Elisa Garuglieri, Thomas Teillet, Viswasanthi Chandra, Ramona Marasco, Volker Vahrenkamp, Daniele Daffonchio, John J. G. Reijmer, Mónica Sánchez‐Román   +8 more
wiley   +1 more source

A model for the concomitant early formation of dolomite and fibrous clays in coastal bay systems: Evidence from the Eocene (Paris Basin, France)

Sedimentology, EarlyView.
ABSTRACT Detailed analysis of Lutetian–Bartonian deposits in the Paris Basin (‘Marnes et Caillasses’ Formation) provides new evidence of concomitant magnesian fibrous clays (palygorskite and sepiolite) and early microcrystalline dolomite. Although relatively uncommon in sedimentary archives, palygorskite and sepiolite are found in a wide range of ...
Julien Talon, Pierre Pellenard, Jean‐Marc Baele, Florence Quesnel, Justine Briais, Alina Iakovleva, Christian Dupuis, Ludovic Bruneau, Emmanuelle Vennin   +8 more
wiley   +1 more source

Rock‐buffered versus fluid‐buffered geochemistry of structurally controlled, hydrothermal dolomite: Insights from the Sichuan Basin, China

Sedimentology, EarlyView.
ABSTRACT Structurally controlled hydrothermal dolomitization, commonly driven by high‐pressure, high‐temperature fluid–rock reactions, offers insights into the tectonic evolution of sedimentary basins and the geochemical composition of their diagenetic fluids.
Huachuan Jiang, Jintong Liang, Karem Azmy, Cole A. McCormick, Taiyuan Fan, Xiaotian Li, Fei Huo, Huaguo Wen   +7 more
wiley   +1 more source

Constraints from rocks in the Taiwan orogen on crustal stress levels and rheology [PDF]

, 2012
Taiwan's Hsüehshan range experienced penetrative coaxial deformation within and near the brittle-plastic transition between ∼6.5 and 3 Ma. This recent and short-lasting deformation in an active, well-studied orogen makes it an ideal natural laboratory ...
Avouac, Jean-Philippe, Chan, Yu-Chang, Kidder, Steven B.   +2 more
core   +1 more source

Early dolomitization of platform carbonates and the preservation of magnetic polarity [PDF]

, 1993
Results from a combination of techniques are presented to evaluate the nature of magnetization in shallow-water platform carbonates which have undergone recrystallization during early calcification and dolomitization. Magnetic grain separates, coercivity
Kirschvink, Joseph L., McNeill, Donald F.   +1 more
core   +1 more source

Out‐of‐Sequence Nucleation in a Blueschist From Syros, Greece

Journal of Metamorphic Geology, Volume 43, Issue 6, Page 641-659, August 2025.
ABSTRACT Two samples of garnet + glaucophane + chloritoid + phengite + paragonite + quartz + epidote + rutile schist from the Cycladic Blueschist Unit of Syros, Greece, have been examined in detail in order to constrain the paragenetic sequence and to infer the processes and time scales for metamorphic recrystallization.
Frank S. Spear, Megan M. Koch
wiley   +1 more source

Igneous processes within late Precambrian volcanic centres near Whitwick, northwestern Charnwood Forest [PDF]

, 2000
Precambrian rocks in northwestern Chamwood Forest differ markedly from their lateral equivalents to the east and south. They are subdivided into the Whitwick Volcanic Complex, of massive to intensely brecciated high-silica andesites and porphyritic ...
Carney, John
core  

Seismic Velocities of Subducted Serpentinites Through the Lizardite‐Antigorite Transition

Geophysical Research Letters, Volume 52, Issue 13, 16 July 2025.
Abstract The mineralogical transition (lizardite to antigorite) occurring in serpentinites dragged down in subduction zones depends on the metamorphic pressure and temperature conditions. The seismic Vp/Vs ratio is useful for distinguishing serpentinites from other mantle rocks. To understand the effects of the metamorphic conditions and the associated
He‐Ming Wang, Mai‐Linh Doan, Anne‐Line Auzende, Stéphane Schwartz, Samuel Chapman, Jérôme Fortin, Xiao‐Ming Tang   +6 more
wiley   +1 more source

Taphonomic Trajectory of Diagenesis: How Site Formation Should Inform Biological Sampling Strategies for Isotopic Studies of Ancestors

American Journal of Biological Anthropology, Volume 187, Issue 3, July 2025.
ABSTRACT Objectives Stable isotope analyses of archaeological bone have become an increasingly common research avenue for interpreting past human behavior. To ensure reliable isotope data is used for interpretations, bone samples must meet quality control standards.
Melanie M. Beasley
wiley   +1 more source