Results 51 to 60 of about 105,423 (180)

The Formation Mechanism and Geological Significance of Graptolite from the Longmaxi Formation: Constraints from in situ Multi-element Imaging Analysis

Yankuang ceshi, 2019
BACKGROUND The black shale of the Longmaxi Formation in the Upper Yangtze region is rich in graptolites. Most of them were preserved as a carbonaceous film, and enriched in organic-rich layers.
ZHU Cheng-lin, WANG Hua-jian, YE Yun-tao, WANG Xiao-mei, HUANG Jia-xuan, ZHU Yu-mei, YANG Rui-dong   +6 more
doaj   +1 more source

Characteristics of effective helium source rocks and releasing mechanism of helium

Journal of Natural Gas Geoscience
Different helium source rocks exhibit varying characteristics, including differences in the content and occurrence states of precursor elements such as uranium (U) and thorium (Th).
Xiaofeng Wang, Dong Zhao, Dongdong Zhang, Xiaofu Li, Keyu Chen, Wenhui Liu   +5 more
doaj   +1 more source

Devastating landslides related to the 2002 Papandayan eruption

Indonesian Journal on Geoscience, 2014
http://dx.doi.org/10.17014/ijog.vol1no2.20063Papandayan is an A-type active strato volcano located at some 20 km SW of Garut or about 70 km SE of Bandung the capital city of West Java Province.
Rudy Dalimin Hadisantono
doaj   +1 more source

A phase inversion polymer coating to prevent swelling and spalling of clay fines in coal seam gas wells

International Journal of Coal Science & Technology, 2018
We report a phase inversion polymer coating as a novel concept with potential to prevent clay swelling and fines generation in coal seam gas, or other petroleum, wellbores.
Lei Ge, Christopher Hamilton, Rahmah Tasha Febrina, Victor Rudolph, Thomas E. Rufford   +4 more
doaj   +1 more source

Sulphur presence in paleokarst infillings and bitumen signs in upper cretaceous carbonates from the Kruja zone (Albania) [PDF]

Micro, Macro & Mezzo Geoinformation, 2021
Kruja zone represents mainly shallow-water carbonate deposits (Cr2-Pg2). They consist of dolomites, limestones with rudists also rich in miliolides and textularides with frequent hiatus, emersions, discontinuity surfaces and even bauxitic horizons ...
Ana FOCIRO, Gjergji FOTO, Antea LINATOPI
doaj   +2 more sources

Mineral chemistry, geochemistry and petrology of Ay-Qaleh-si intrusive body (east of Takab, NW Iran). [PDF]

پترولوژی, 2019
The intrusive body of the Ay-Qaleh-Si is located between the West Azarbaijan and Kurdistan provinces at the intersection of the Urumieh–Dokhtar volcanic belt (UDVB) and the Sandaj-Sirjan metamorphic belt of NW Iran.
hamid ghoreishvandi, Ali Asghar Sepahi Gerow, Mohammad Maanijou   +2 more
doaj   +1 more source

Characteristics of the early miocene globigerinid-rich siliciclastic-carbonate reservoirs in ultra-deep water areas of the Baiyun sag, pearl river mouth basin, South China sea

Frontiers in Earth Science
Exploring new types of high-quality reservoirs in terrigenous clastic-starved (ultra-)deep-water areas is a crucial component in ensuring future energy supply. Recent drilling (water depth >1,500 m) in the Pearl River Mouth Basin revealed globigerinid-
Yongkun Ma, Yongkun Ma, Leyi Xu, Leyi Xu, Leyi Xu, Han Jiang, Siyi Yao, Xiaomeng Wang, Xiaomeng Wang, Hui Sun, Hui Sun, Beichen Chen, Beichen Chen   +12 more
doaj   +1 more source

A general orientation distribution function for clay-rich media

Nature Communications, 2019
The role of the preferential orientation of clay platelets on the properties of a wide range of natural and engineered clay-rich media is well established.
Thomas Dabat, F. Hubert, E. Paineau, P. Launois, Claude Laforest, Brian Grégoire, Baptiste Dazas, E. Tertre, Alfred Delville, E. Ferrage   +9 more
semanticscholar   +1 more source

Hydrophilic and strength-softening characteristics of clay-rich rocks

Abstract To better understand the mechanism of the strength weakening process of clay-rich rocks after interacting with water, the relationship between mineral composition, microscopic pore structure and gaseous water adsorption characteristics of clay-rich rocks was comprehensively analyzed by using X-ray diffraction (XRD), scanning electron ...
Zongfang Han, Mohua Bu, Yuqiong Li, Manchao He   +3 more
openaire   +1 more source

Deposition of >3.7 Ga clay-rich strata of the Mawrth Vallis Group, Mars, in lacustrine, alluvial, and aeolian environments.

Geological Society of America Bulletin, 2019
The presence of abundant phyllosilicate minerals in Noachian (>3.7 Ga) rocks on Mars has been taken as evidence that liquid water was stable at or near the surface early in martian history.
D. Lowe, J. Bishop, D. Loizeau, J. Wray, R. Beyer   +4 more
semanticscholar   +1 more source