Results 11 to 20 of about 1,952 (183)

Assessing the Effect of Large Igneous Provinces on Global Oceanic Redox Conditions Using Non‐traditional Metal Isotopes (Molybdenum, Uranium, Thallium)

open access: yesGeophysical Monograph Series, Page 305-323., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Brian Kendall   +2 more
wiley  

+7 more sources

Upper Cambrian-Ordovician reservoir characteristics in Well Gucheng-4 area, Tarim Basin

open access: yesPetroleum Exploration and Development, 2008
: Based on the data of regional geologic background, core, and thin section, this paper studies the characteristics of sedimentary facies and reservoirs of the Upper Cambrian-Ordovician in Well Gucheng-4, Tarim Basin, and points out the potential and ...
Chang-jian ZHU   +6 more
doaj   +1 more source

Warm-water Dasycladaceae algae from the Late Ordovician of the Parahio Valley, Spiti, India [PDF]

open access: yesEstonian Journal of Earth Sciences, 2019
Warm-water Dasycladaceae algae Mastopora and Cyclocrinites were for the first time recorded from the Takche Formation (Upper Ordovician–lower Silurian), Parahio Valley, Spiti, India.
Ravi S. Chaubey   +5 more
doaj   +1 more source

Distribution of phosphorus in the Middle and Upper Ordovician Baltoscandian carbonate palaeobasin [PDF]

open access: yesEstonian Journal of Earth Sciences, 2010
Baltoscandian Middle and Upper Ordovician carbonate rocks are relatively poor in phosphorus, with the P2O5 content of 0.05–0.5%, rarely exceeding 1%. Phosphorus distribution in the Ordovician carbonate succession shows spatial and temporal variations. In
Leho Ainsaar   +3 more
doaj   +1 more source

THE AMERICAN UPPER ORDOVICIAN STANDARD [PDF]

open access: yesGeological Society of America Bulletin, 1961
The large number of classifications of the type Cincinnatian (Ordovician) are to a great extent variations of a few fundamental concepts. Each of these elements is at least 40 years old and founded in the more rigid stratigraphic faiths of those times.
openaire   +1 more source

Difference Analysis of Organic Matter Enrichment Mechanisms in Upper Ordovician-Lower Silurian Shale from the Yangtze Region of Southern China and Its Geological Significance in Shale Gas Exploration

open access: yesGeofluids, 2019
The upper Ordovician-lower Silurian shale has always been the main target of marine shale gas exploration in southern China. However, the shale gas content varies greatly across different regions.
Ming Wen   +14 more
doaj   +1 more source

Natural gas accumulation and models in Ordovician carbonates, Ordos Basin, NW China

open access: yesPetroleum Exploration and Development, 2014
According to sedimentary environment, sources, hydrocarbon accumulation characteristics and gas reservoir types of the Ordovician in the Ordos Basin, the Ordovician carbonate rocks in the basin have good gas accumulation conditions.
Yanru GUO   +9 more
doaj   +1 more source

The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin)

open access: yesComptes Rendus. Géoscience, 2023
In the Ennedi Plateau, northeastern Chad, Cambrian(?)–Ordovician to Carboniferous strata represent one of the most proximal succession of the north-facing Gondwana platform. This study presents preliminary results related to the c.
Ghienne, Jean-François   +4 more
doaj   +1 more source

An Ordovician ostracod palaeopsychrosphere? [PDF]

open access: yesEstonian Journal of Earth Sciences, 2023
Ostracods are tiny bivalved crustaceans with a fossil record extending into rocks of the Lower Ordovician. They occupy almost all aquatic environments today, from the ocean abyssal planes to damp forest leaf litter.
Anna McGairy   +6 more
doaj   +1 more source

Identification and distribution of marine hydrocarbon source rocks in the Ordovician and Cambrian of the Tarim Basin

open access: yesPetroleum Exploration and Development, 2012
A process for identifying marine hydrocarbon source rocks is established based on outcrop measurement, ground-penetrating radar survey, core analysis, logging evaluation, seismic interpretation, etc.
Shuichang ZHANG   +5 more
doaj   +1 more source

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