Results 31 to 40 of about 5,112 (179)

Microfacies Analysis and Depositional Environment of Middle Jurassic Samana Suk Formation, Chichali Nala Section, Surghar Range, Pakistan.

International Journal of Economic and Environment Geology, 2021
The Middle Jurassic age Samana Suk Formation, exposed in Chichali Nala section of Surghar ranges has been investigated by field work, petrographic study and XRD analysis to understand the microfacies, depositional environment and fault related ...
Imran Ahmad, Said Mukhtar Ahmad, Matee Ullah, Aurangzeb ., Syed Muhammad Waseem Sajjad, NAzir Ul Islam
doaj   +1 more source

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

Temporal evolution, petrography and composition of dolostones in the Upper Devonian Plavinas Regional Stage, southern Estonia and northern Latvia [PDF]

Estonian Journal of Earth Sciences, 2013
The Upper Devonian Plavinas Regional Stage in southern Estonia and northern Latvia is represented by dolostones containing interlayers of dolomitic marlstones and limestones.
Anne Kleesment, Kristjan Urtson, Tarmo Kiipli, Tõnu Martma, Anne Põldvere, Toivo Kallaste, Alla Shogenova, Kazbulat Shogenov   +7 more
doaj   +1 more source

A PERCOLATION MODEL OF DIAGENESIS [PDF]

International Journal of Modern Physics C, 2002
The restructuring process of diagenesis in the sedimentary rocks is studied using a percolation type model. The cementation and dissolution processes are modeled by the culling of occupied sites in rarefied and growth of vacant sites in dense environments.
Manna, S. S., Datta, T., Karmakar, R., Tarafdar, S.   +3 more
openaire   +2 more sources

Molecular Palaeontology Prospects From Exceptionally Preserved Eocene Brackish‐Water Bivalve Batissa sitakaraensis (Venerida: Corbiculidae) From Hokkaido, Japan

Geological Journal, EarlyView.
This study reports the exceptional preservation of the Eocene freshwater bivalve Batissa sitakaraensis from Hokkaido, Japan. Multimodal analyses reveal that both the aragonitic shell mineralogy and the delicate organic periostracum retain their original structural and chemical characteristics after millions of years.
Taro Yoshimura, Kazuki Hirota, Hiroyuki Kagi, Takashi Matsubara, Takenori Sasaki   +4 more
wiley   +1 more source

Local Structures of Se and Br in Cretaceous–Paleogene Boundary Sediments and Concentration Effects of Ferrihydrite Originating From Impact Ejecta

Geological Journal, EarlyView.
Chemical states of Se and Br atoms in the KPg boundary sediments from Stevns Klint were studied using XAFS spectroscopy. The high concentrations of Se4+ could become an index of the degree to which the global environment was soiled with dust and ash derived from impact ejecta or volcanic eruptions.
Kei‐ichiro Murai, Akira Yoshiasa, Ginga Kitahara, Makoto Tokuda, Satoko Ishimaru, Toshihiro Moriga   +5 more
wiley   +1 more source

Linkage of diagenesis to depositional environments and stratigraphy in the northern part of the Baltic basin [PDF]

Estonian Journal of Earth Sciences, 2012
The spatial and temporal distribution of carbonate cementation was investigated in Devonian siliciclastic rocks of the northern part of the Baltic basin, using geochemical (oxygen and carbon stable isotope, microprobe and bulk chemical analyses), optical,
Kristjan Urtson, Kazbulat Shogenov, Alla Shogenova, Kalle Kirsimäe, Tõnu Martma, Anne Kleesment   +5 more
doaj   +1 more source

Next‐Generation Paleopathology: Using Commercial AI in Bioarchaeological Diagnosis

International Journal of Osteoarchaeology, EarlyView.
ABSTRACT Artificial intelligence encompasses computational systems capable of performing cognitive functions such as learning, reasoning, and problem‐solving. Within this domain, generative AI and large language models such as ChatGPT, Gemini, and Copilot have shown significant potential in clinical diagnostics.
Jessica Mongillo, Giulia Vescovo, Giulia Manzo, Nicoletta Zedda, Barbara Bramanti   +4 more
wiley   +1 more source

Body Size Regulates Niche Overlap Asymmetry in the Subtropical Andes Rain Shadow: Isotopic Paleoecology of Oligocene South American Ungulates

Integrative Zoology, EarlyView.
This study provides the first isotopic analysis of Oligocene mammals from Quebrada Fiera, Mendoza, Argentina, filling a major gap in South American paleontology. It reveals a latitudinal gradient in aridity due to the Andean rain shadow and highlights the role of (semi)permanent water bodies in sustaining diverse herbivore communities. Additionally, it
Dánae Sanz‐Pérez, Santiago Hernández Del Pino, Esperanza Cerdeño, Manuel Hernández Fernández, Laura Domingo   +4 more
wiley   +1 more source

Diagenesis of organic-rich shale in Second Member of Kongdian Formation in Cangdong Sag and its influence on reservoir characteristics

Youqi dizhi yu caishoulu
The diagenesis and evolution of organic-rich shale have an important influence on the characteristics of shale reservoirs， but the relationship between diagenesis and reservoir characteristics of organic-rich shale in the Second Member of Kongdian
FENG Guozheng, YAN Jihua, PU Xiugang, CHEN Shiyue, YIN Lingzhi, LA Weihao, HAN Wenzhong, ZHANG Wei   +7 more
doaj   +1 more source