Results 41 to 50 of about 928 (188)

Depositional Structures and Their Reservoir Characteristics in the Wufeng–Longmaxi Shale in Southern Sichuan Basin, China

Energies, 2022
This paper documents depositional structures and their reservoir characteristics in the Wufeng–Longmaxi shale from outcrops and cores using thin sections, X-ray powder diffraction (XRD) analysis, carbon–sulfur analyzer, helium porosimeter, decay ...
Zhensheng Shi, Tianqi Zhou, Hongyan Wang, Shasha Sun   +3 more
doaj   +1 more source

Fe–Mn Crust δ98Mo Decline Records Tectonic Forcing on Marine Oxide Sink Reduction During the Early Eocene–Early Oligocene

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract S, Tl, and W isotope records document pronounced early Eocene shifts in marine redox, yet the absence of a Mo isotope record obscures its progression. Here, we present ∼80 Myr Mo–Os–Be–Nd isotope profiles from a Northwest Pacific hydrogenetic Fe–Mn crust, revealing a systematic δ98Mo decline from −0.24‰ (early Eocene) to −0.83‰ (early ...
Limin Zhang, Jiangbo Ren, Hongjin Chen, Haozhe Wang, Zhen Sun, Yong Yang, Huodai Zhang, Zhenquan Wei, Lixue Zhang, Yingzhi Ren, Gaowen He   +10 more
wiley   +1 more source

Iron Sources and Cycling During Diagenetic Transformations of Negev Phosphorites (Israel)

Paleoceanography and Paleoclimatology, Volume 41, Issue 4, April 2026.
Abstract The Late Cretaceous Negev area in the Levant was influenced by high productivity upwelling in southern Tethys, leading to massive deposition of phosphorites. The phosphorites occur in two facies: (a) pristine phosphorites with low phosphorous (P) content, formed under low‐energy, high‐productivity conditions, and (b) reworked phosphorites with
Irina Zweig, Alexey Kamyshny Jr., Aya Schneider‐Mor, Nadya Teutsch   +3 more
wiley   +1 more source

Unraveling the Enrichment Mechanisms of Rare Earth Elements in Deep‐Sea Sediments: An Environmental Magnetic Perspective

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract Deep‐sea rare earth elements and yttrium (REY)‐rich sediments have attracted considerable attention since their discovery in 2011. However, the environmental factors controlling REY enrichment remain poorly understood, largely because paleoceanographic proxies are absent in pelagic clays.
Xiangfeng He, Jianxing Liu, Dongjie Bi, Yamin Zhang, Mu Huang, Miao Yu, Fengdeng Shi, Jianhua Gao, Xuefa Shi   +8 more
wiley   +1 more source

Iron–Phosphorus–Carbon Coupled Cycling in Lacustrine System of Ordos Basin During the Middle Triassic

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.
Abstract Widespread organic‐rich shales are associated with perturbations in productivity or preservation conditions; however, the major controlling factors, especially the phosphorus (P) and iron (Fe) interactions and their impacts on organic carbon burial in the paleolake ecosystem remain poorly understood.
Bo Wang, Rukai Zhu, Pengcheng Ju, Quanyou Liu, Weiming Xu, Peng Li, Wang Zhang, Xinping Liang   +7 more
wiley   +1 more source

Geochemical characteristics of the Permian sedimentary rocks from Qiangtang Basin: Constraints for paleoenvironment and paleoclimate

Terrestrial, Atmospheric and Oceanic Sciences, 2017
Qiangtang Basin is expected to become important strategic petroleum exploitation area in China. However, little research has been done on the Permian strata in this area.
Junjie Hu, Qi Li, Chunyan Song, Shuangqing Wang, Bin Shen   +4 more
doaj   +1 more source

Geochemical characteristics of Early Cambrian phosphate bearing sedimentary rocks from the Mussoorie Syncline, India: Implications for paleo-redox conditions

Geosystems and Geoenvironment, 2022
The phosphate bearing sedimentary rocks of Masrana and Kimoi blocks of Mussoorie Syncline are found to occur associated with a variety of chert-shale-carbonate with some pyrites of Tal Group of Early Cambrian age.
Saif A. Khan, Shamim A. Dar, K.F. Khan, Yasir Karim   +3 more
doaj   +1 more source

Pliocene–Pleistocene Redox Evolution of the Peruvian Margin: A Multi‐Proxy Approach

Paleoceanography and Paleoclimatology, Volume 41, Issue 2, February 2026.
Abstract Due to upwelling of nutrient‐rich waters, the Peruvian Margin is one of the most productive regions of the global ocean, hosting one of the most pronounced and shallowest oxygen minimum zones. This combination of high productivity and low oxygen makes the Peruvian margin a critical site for reconstructing past environmental changes.
P. L. Fraga‐Ferreira, C. Siebert, M. F. Lehmann, M. Frank, F. Scholz   +4 more
wiley   +1 more source

A Sándorhegyi Formáció szervetlen geokémiai vizsgálatának eredményei (Pécselyi Tagozat, Nosztori-völgy) | Inorganic geochemistry of Sándorhegy Formation (Pécsely Member, Nosztor Valley, Hungary) [PDF]

, 2005
Dolgozatunkban – őskörnyezeti keretbe illesztve – a Sándorhegyi Formáció szervesanyagban gazdag mészköveinek (Pécselyi Tagozat, Csopak, Nosztori-völgy) részletes szervetlen geokémiai jellemzését mutatjuk be.
Raucsikné Varga, Andrea Beáta, Raucsik, Béla, Horváth, Hajnalka   +2 more
core   +1 more source

Organic matter characteristics in black shales of the southwestern paleogene N'kapa formation, Douala Sub-basin Cameroon: Evidence from stable isotopes and rock-eval pyrolysis

Evolving Earth
Shallow marine black shales from outcrops, river channels, drilled and dug wells in Dibombari-Kompina-Mian (Stage-1) and Pendanboko (Stage-2) of the Paleogene N'kapa Formation in Douala Sub-basin were studied.
Ngong Roger Ngia, Elie Fosso Menkem, Alexandrine N'nanga, Christopher Fuanya, Median Yongye   +4 more
doaj   +1 more source