Results 51 to 60 of about 421 (164)

Biostratigraphy of Gurpi Formation in Samand anticline (Lurestan province) Based on calcareous nannofossils [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2017
The present study is an attempt to biostratigraphically classify the rocks of Gurpi Formation at Samand Anticline with the help of calcareous nannofossils. The succession measures 197 meters in thickness and consists of shale, marl and marly limestone. A
samira shahriyary, Anoshiravan Kani, Hassan Amiribakhtiar   +2 more
doaj   +1 more source

Hydrothermal Circulation During Continental Breakup: Evolution of a Subseafloor Stockwork Mineralization at the South China Sea Rifted Margin

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 11, November 2025.
Abstract Hydrothermal activity during continental breakup and early oceanic spreading is poorly understood due to limited samples. A basalt‐hosted hydrothermal mineralization, drilled during IODP Expedition 367/368 at the northern South China Sea at the continent‐ocean transition provides a unique opportunity to investigate this phenomenon.
Jörg Follmann, Froukje M. van der Zwan, Sven Petersen, Matthias Frische   +3 more
wiley   +1 more source

A REVISED METHOD FOR OBSERVING THE SAME NANNOFOSSIL SPECIMENS WITH SCANNING ELECTRON MICROSCOPE AND LIGHT MICROSCOPE

Rivista Italiana di Paleontologia e Stratigrafia, 2018
A new method for the observation of the same nannofossil specimens with scanning electron microscope and light microscope, involving the use of a grid, is described.
C. PIRINI RADRIZZANI, D. CASTRADORI, E. ERBA, G. GUASTI, A. RIZZI   +4 more
doaj   +1 more source

Investigating the Timescale of Weathering Signals Preserved in Marine Sediments—Insights From the Holocene Mediterranean

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract The climate–weathering feedback exerts a vital role in long‐term planetary habitability. However, its operational timescales remain unclear due to challenges in quantifying past weathering intensity, especially in marine sediments—the final sink of continental weathering fluxes. Using Holocene Mediterranean sediments as a test case, we examine
Jiawang Wu, Shengnan Yao, Yulong Guo, Christophe Colin, Andrea Zerboni, Amalia Filippidi, Sicheng Wang, Zhifei Liu, Shouye Yang, Gert J. de Lange   +9 more
wiley   +1 more source

CALIBRATION OF THE PLIENSBACHIAN-TOARCIAN CALCAREOUS NANNOFOSSIL ZONE BOUNDARIES BASED ON AMMONITES (BASQUE-CANTABRIAN AREA, SPAIN)

Rivista Italiana di Paleontologia e Stratigrafia, 2004
Based on a continuous succession of ammonite and calcareous nannofossil assemblages, the main purpose of this paper is the correlation between ammonite and calcareous nannofossil zone boundaries in two expanded sections from the Basque-Cantabrian area ...
NICOLA PERILLI, MARÍA JOSÉ COMAS-RENGIFO, ANTONIO GOY   +2 more
doaj   +1 more source

Slimehead Size Through Time: Testing the Temperature–Size Relationship in Late Cretaceous Trachichthyidae

Ecology and Evolution, Volume 15, Issue 10, October 2025.
In this study, we use the extensive fossil record of the extinct Late Cretaceous Trachichthyid fish genus, Hoplopteryx, from the British Chalk Group to explore how this family responded to past climate change events. Our study is the first to demonstrate that seawater palaeotemperature, estimated from oxygen stable isotope values, is a significant ...
Chloe V. Griffiths, James D. Witts, Julie C. S. Brown, Emma L. Bernard, Richard J. Twitchett   +4 more
wiley   +1 more source

Calcareous nannofossils and Mesozoic oceanic anoxic events

Marine Micropaleontology, 2004
Abstract Twenty-five years ago, Mesozoic oceanic anoxic events (OAEs) were documented and formalised as intervals of widespread to global deposition of organic matter. The Toarcian, Early Aptian (OAE1a) and latest Cenomanian (OAE2) OAEs are truly global in nature, commonly carbonate-poor, and typically represented by organic carbon-rich black shales.
openaire   +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, Volume 72, Issue 6, Page 1860-1898, October 2025.
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

Implications of Northwest Pacific Ocean Eolian Records for Northern Hemisphere Wind System Evolution

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract Northwest Pacific Ocean sedimentary eolian records preserve abundant information about the temporal evolution of Northern Hemisphere atmospheric circulation. The large spatial scale of these wind systems means that they play key roles in driving dust transportation from inland areas to the open ocean. However, the altitudinal range of dominant
Qiang Zhang, Andrew P. Roberts, Xiangyu Li, Zhongshi Zhang, Qingzhen Hao, Zhengquan Yao, Xu Tang, Lixia Ju, Jianxing Liu, Hengheng Zhao, Ke Gui, Huizheng Che, Xuefa Shi, Qingsong Liu, Zhengtang Guo   +14 more
wiley   +1 more source

Offshore Record of Explosive Volcanic Eruptions in the Southern Part of the Panamá Basin During the Past 10 Myr: 1. Tephrostratigraphy, Cross‐Correlations and Geochemical Characterization

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract Northern Andean volcanism is characterized by an intense Quaternary activity, whose onshore deposits have partly covered Mio‐Pliocene products associated with the early development of the arc, making it difficult to obtain an exhaustive catalog of past eruptions.
Mathilde Bablon, Marianne Saillard, François Michaud, François Nauret, Pablo Samaniego, Jean‐Luc Le Pennec, Silvana Hidalgo, Gueorgui Ratzov, Jean‐Luc Devidal, François Orange, Céline Liorzou   +10 more
wiley   +1 more source