Results 191 to 200 of about 58,643 (272)

Formation Stages and Evolution Patterns of Structural Fractures in Marine Shale: Case Study of the Lower Silurian Longmaxi Formation in the Changning Area of the Southern Sichuan Basin, China

, 2020
Taking the Lower Silurian Longmaxi Formation in the Changning area of the southern Sichuan Basin as an example, the characteristics and formation stages of tectonic fractures are comprehensively st...
Cunhui Fan, Hu Li, Shengxian Zhao, Qirong Qin, Yu Fan, Jian-fa Wu, Jian Zhang   +6 more
semanticscholar   +1 more source

Silurian anorogenic basic and acidic magmatism in Northwest Turkey: Implications for the opening of the Paleo-Tethys

, 2020
The Sakarya Zone (northern Turkey) is a Gondwana-derived continental block accreted to northern Laurussia during the Carboniferous, and is regarded as the eastward extension of Armorica. Timing of its detachment from the northern margin of Gondwana, thus
G. Topuz, O. Candan, A. Okay, A. Quadt, M. Othman, T. Zack, Jia-Min Wang   +6 more
semanticscholar   +1 more source

A Silurian pseudocolonial pterobranch

Current Biology, 2023
Pterobranchs, a major group of the phylum Hemichordata, first appear in the fossil record during the Cambrian,1 and there are more than 600 fossil genera dominated by the mainly planktic graptolites of the Paleozoic, which are widely used as zone fossils for correlating sedimentary rock sequences.2 Pterobranchs are rare today; they are sessile marine ...
Derek E.G. Briggs, Nicolás Mongiardino Koch   +1 more
openaire   +2 more sources

Mineralogical and geochemical characteristics of the Paleozoic source rocks, Akkas gas field, Western Desert of Iraq: Implications for their origin, maturation and Ordovician-Silurian transition

Marine and Petroleum Geology, 2020
Ordovician-Silurian black shales are the source rocks in the Palaeozoic petroleum system in Iraq. However, their source and depositional conditions from their mineralogy and inorganic geochemistry are quite lacking in previous works.
I. Mohammed, S. Farouk, H. Baioumy, N. Lotfy, A. Al-hadidy   +4 more
semanticscholar   +1 more source

Silurian

Geological Society, London, Memoirs, 1992
Abstract The history of establishment of the Silurian System (and hence of the Silurian Period) and its principal divisions has been reviewed by Cocks et al . (1971) and Holland (1984, 1989 a ).
M. G. Bassett, B. J. Bluck, R. Cave, C. H. Holland, J. D. Lawson   +4 more
openaire   +1 more source

Biogenic silica and organic carbon fluxes provide evidence of enhanced marine productivity in the Upper Ordovician-Lower Silurian of South China

Palaeogeography, Palaeoclimatology, Palaeoecology, 2019
Biogenic silica is a powerful palaeoproductivity proxy in palaeomarine environments and is significant within shale gas reservoirs, demonstrating the association of marine hydrocarbon source rocks with the abundance of micro-siliceous fossils, yet ...
Maliha Zareen Khan, Q. Feng, Keming Zhang, Wei Guo   +3 more
semanticscholar   +1 more source

Mechanism analysis of organic matter enrichment in different sedimentary backgrounds: A case study of the Lower Cambrian and the Upper Ordovician-Lower Silurian, in Yangtze region

Marine and Petroleum Geology, 2019
In order to meet the demand of shale oil and gas exploration, it is more and more important to study the controlling effect of sedimentary environment on the enrichment of organic matter.
Kun Zhang, Yan Song, Shu Jiang, Zhenxue Jiang, C. Jia, Yizhou Huang, Ming Wen, Weiwei Liu, Xuelian Xie, Tianlin Liu, Pengfei Wang, Changan Shan, Yinghui Wu   +12 more
semanticscholar   +1 more source

Detrital provenance evolution of the Ediacaran–Silurian Nanhua foreland basin, South China

Gondwana Research, 2015
Zheng-Xiang Li, Li Su, Jin-Hui Yang
exaly   +2 more sources

Climatic and oceanic controlled deposition of Late Ordovician-Early Silurian black shales on the North Yangtze platform, South China

Marine and Petroleum Geology, 2019
Black shales deposited across the Late Ordovician and Early Silurian transition are considered to be the most important source rock and shale gas reservoirs in the Yangtze region of South China. However, the origin of these sediments remains contentious.
Yan De-tian, Chen Dai-zhao, Wang Zhuozhuo, Liao Jing, Yang Xiang-rong, Z. Bao   +5 more
semanticscholar   +1 more source

Ordovician and Silurian ichnofossils from carbonate facies in Estonia: A collection-based review

Palaeoworld, 2019
Trace fossils are common in the Ordovician and Silurian shallow marine carbonate succession of Estonia, with 45 ichnofossil genera and five bioclaustration structures identified, representing 31 categories of architectural designs and nine categories of ...
U. Toom, O. Vinn, O. Hints
semanticscholar   +1 more source