Results 91 to 100 of about 5,620 (262)

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta, Neivaldo Araújo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferrière, Wolf Uwe Reimold, Ana Maria Góes, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco   +9 more
wiley   +1 more source

From Siliciclastics to Carbonates and Black shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscapes of the Volga-Ural Petroleum Province

Georesursy
Analyses of the three predominant types of sedimentation – siliciclastic, carbonate and black shale – revealed their discontinuity/continuity across various facies environments within the Middle and Late Devonian of the central part of the Volga-Urals ...
V. V. Silantiev, D. N. Miftakhutdinova, N. G. Nurgalieva   +2 more
doaj   +1 more source

Toarcian oceanic anoxic event: An assessment of global causes using belemnite C isotope records

, 2005
Two hypotheses have been proposed to explain simultaneous large negative excursions (up to 7% PeeDee belemnite) in bulk carbonate (delta(13)C(carb)) and organic carbon isotope records (delta(13)C(org)) from black shales marking the Toarcian oceanic ...
van de Schootbrugge, B, Rosenthal, Y, Miller, KG, Bailey, TR, Wright, JD, McArthur, JM   +5 more
core  

Geophysical investigation of the Santa Marta impact structure—Piauí State, Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract The Santa Marta impact structure in northeastern Brazil, recognized as a partially preserved complex crater, was investigated through an integrated geophysical study employing magnetotelluric (MT) and gravity methods. Our research provides constraints on the crater's subsurface architecture.
Elienara Vasconcelos, João De Oliveira, Marcos Vasconcelos, Martyn Unsworth, Andrea Santos‐Matos, Florivaldo Sena   +5 more
wiley   +1 more source

Paleoenvironmental reconstruction and carbon and sulfur isotopes perturbation in black shales of the Paleocene Bolander member in the N’kapa Formation, Douala Sub-basin Cameroon

Geosystems and Geoenvironment
Black shales deposited across the Paleocene Bolander member of the N’kapa Formation are considered important source rock and shale gas reservoirs in the Douala sub-basin.
Ngong Roger Ngia, Elie Fosso Menkem, Alexandrine N’Nanga, Christopher Fuanya, Median Yongye   +4 more
doaj   +1 more source

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, EarlyView.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

Black shales – an unconventional source of noble metals and rhenium

Записки Горного института
The content of noble metals and rhenium in the Lower Paleozoic black shales of the eastern Baltic paleobasin in Russia was estimated. Shales are enriched in platinoids (PGM to 0.12 g/t) and rhenium (to 1.54 g/t).
Elena G. Panova, Svyatoslav Yu. Engalychev, Yaroslav Yu. Fadin, Galina A. Oleinikova, Irina Yu. Tikhomirova   +4 more
doaj  

Mineralogy and geochemistry of the Cambrain Shuijingtuo Formation black shales from Western Hubei, China: implications on enrichment of critical metals and paleoenvironment

Frontiers in Marine Science
Black shales have attracted the attention of numerous researchers not only due to their high potential as hydrocarbon source rocks and shale gas reservoirs, but also to the enrichment of critical metal elements in black shale series.
Yuan Wang, Jing Li, Yang Lin, Xinguo Zhuang, Vanlong Hoang, Peng Wu, Xin Luo, Han Zhang, Xiaoyang Zhang   +8 more
doaj   +1 more source

Mineralogy and Geochemistry of the Black Shales, Selangor

, 2016
This report presents the mineralogy and geochemistry of Black Shales at new outcrop located near Rawang, Selangor. However, nothing has been published regarding their geology, composition and maturation of this new outcrop.
Ramzi, Muhamad Syafiq
core  

The geochemistry of metalliferous black shales : understanding primary enrichments, metamorphic processes, and the role of metal-rich black shales in archiving earth evolution

, 2017
Black shales offer an important context to study the evolution of the oceans and atmosphere. As an archive of past climatic, evolutionary and geodynamic events in Earth history they offer the opportunity to further understand the nature of such events ...
Johnson, SC (15936263)
core   +1 more source