Results 61 to 70 of about 6,336 (226)

Reservoir-forming by lateral supply of hydrocarbon: A new understanding of the formation of Ordovician gas reservoirs under gypsolyte in the Ordos Basin

Natural Gas Industry B, 2014
There developed thick gypsum-salt strata in the Lower Paleozoic Ordovician in the Ordos Basin, particularly gypsum-salt in the 6th segment of the 5th member of Majiagou Fm (O1m56) in a wide distribution, serving as a good regional cap.
Yang Hua, Bao Hongping, Ma Zhanrong
doaj   +1 more source

The SPICE carbon isotope excursion in Siberia: a combined study of the upper Middle Cambrian-lowermost Ordovician Kulyumbe River section, northwestern Siberian Platform

, 2008
An integrated, high-resolution chemostratigraphic (C, O and Sr isotopes) and magnetostratigraphic study through the upper Middle Cambrian–lowermost Ordovician shallowmarine carbonates of the northwestern margin of the Siberian Platform is reported. The
Gallet, Y, Kouchinsky, A, Pavlov, V, Ziegler, K, Runnegar, B, Shields, G, Young, E, Bengtson, S, Veizer, J, Korovnikov, I   +9 more
core  

The Durness Group of NW Scotland: a stratigraphical and sedimentological study of a Cambro-Ordovician passive margin succession [PDF]

, 2010
The Cambrian to Ordovician Durness Group was deposited on the Scottish sector of the passively-subsiding, continental margin of the Laurentian craton, and now forms part of the Hebridean terrane, lying to the west of the Moine Thrust zone.
Raine, Robert James
core  

Filling the Gondwanan gap:paleobiogeographic implications of new crinoids from the Castillejo and Fombuena formations (Middle and Upper Ordovician, Iberian Chains, Spain)

, 2017
A diverse crinoid fauna is described from the Upper Ordovician (Katian) Fombuena Formation from the eastern Iberian Chains of Spain. New crinoids include the diplobathrid camerates Fombuenacrinus nodulus n. gen. n. Sp., Goyacrinus gutierrezi n. gen.
Cole, Selina R., Colmenar Lallena, Jorge, Colmenar, Jorge, William I. Ausich, Selina R. Cole, Ausich, William I., Zamora Iranzo, Samuel Andrés, Samuel Zamora, Zamora, Samuel, Jorge Colmenar   +9 more
core   +1 more source

Did lingering ice sheets moderate anoxia in the early Palaeozoic of Libya?

The Hirnantian glaciation of West Gondwana produced a glacially sculpted topography, which is draped by organic-rich latest Ordovician and early Silurian ‘hot shales’.
Meinhold, Guido, Le Heron, D. P., Page, A. A., Whitham, A. G.   +3 more
core   +1 more source

Effect of the hydrothermal activity in the Lower Yangtze region on marine shale gas enrichment: A case study of Lower Cambrian and Upper Ordovician-Lower Silurian shales in Jiangye-1 well

Open Geosciences, 2018
Finding favorable sites for the exploration of shale gas, is still one of the important areas of research that needs immediate attention. The content of organic matter in shale plays a crucial role in the hydrocarbon generation potential, reservoir space
Liu Weiwei, Zhang Kun, Jiang Zhenxue, Jiang Shu, Song Yan, Jia Chengzao, Huang Yizhou, Wen Ming, Liu Tianlin, Xie Xuelian, Wang Pengfei, Shan Chang’an, Liu Xiaoxue, Wang Xin   +13 more
doaj   +1 more source

Rare earth geochemistry of Arenig cherts from the Ballantrae Ophiolite and Leadhills Imbricate Zone, southern Scotland: implications for origin and significance to the Caledonian Orongeny [PDF]

, 1999
Rare earth element (REE) data from low to mid-Arenig cherts are used to test competing models for the early Ordovician evolution of the Laurentian margin in the northern British Isles.
Armstrong, H.A., Owen, A.W., Floyd, J.D.
core  

On the Upper Ordovician unconformity in the Pyrenees

, 2007
In recent years, contradictory reports about whether or not an unconformity exists at the base of the Upper Ordovician succession of the Pyrenees have been made. In the Cerdanya area (Central Pyrenees), good outcrop evidence for this unconformity is displayed at the base of the Rabassa conglomerates.
Casas Tuset, Josep Maria, Fernández, Óscar   +1 more
openaire   +2 more sources

Paleomagnetic Constraints on the Separation of the Olongbuluke Block From the North China Block During the Late Cambrian–Middle Ordovician and Its Tectonic Significance

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract The collisional evolution of the micro‐blocks in the northeastern Tibetan Plateau is relatively well constrained. However, the reason why a fragment of the North China Block, the Olongbuluke Block, became separated from North China by the Central Qilian Block (a fragment of the South China Block) remains unclear.
Teng Wang, Yanan Zhou, Ruiyang Chai, Xin Cheng, Hanning Wu   +4 more
wiley   +1 more source

A new species of graptolite from the western margin of the Kufra Basin, Libya

Normalograptus kufraensis sp. nov. occurs as monospecific assemblages in the Tanezzuft Formation at the western margin of the Kufra Basin (Jabal Eghei), southern Libya.
Elgardy, Mohamed, Meinhold, Guido, Le Heron, D. P., Page, A. A.   +3 more
core   +1 more source