Results 81 to 90 of about 855 (200)

Oil accumulation and tectonic physicochemical parameters of Yanchang Formation of Triassic in the southern Ordos Basin, China

Open Geosciences
As the second largest sedimentary basin in China, the Ordos Basin has achieved significant results in tight oil and gas. By methods of fluid inclusion and tectonic evolution, the tectonic-physicochemical parameters of hydrocarbon accumulation are ...
Ding Chao, Guo Lan, Guo Shun, Huo Ruilin, Qiao Chang, Tian Suo, Chen Yu   +6 more
doaj   +1 more source

Relative proportions of smectite and illite, and illite-smectite oxygen-isotope compositions (δ18OI-S) of 39 mudstone samples collected from a lacustrian section at Paleolake Olduvai

, 2020
Most clay minerals in sedimentary environments have traditionally been considered to be of detrital origin, but under certain conditions, authigenic clay minerals can form at low temperature through the transformation of precursor clays or as direct ...
Beverly, Emily J, Simpson, Alexandra M, Gebregiorgis, Daniel, Deocampo, Daniel M, Ashley, Gail M, Delaney, Jeremy S, Longstaffe, Fred J, Cuadros, Javier   +7 more
core   +1 more source

Paleoenvironmental characteristics of continental shale and its significance to organic matter enrichment: Taking the fifth member of Xujiahe Formation in Tianfu area of Sichuan Basin as an example

Open Geosciences
Lake-phase organic-rich shales are widely developed in the fifth member (Xu5 Member) of the Triassic Xujiahe Formation in the Sichuan Basin. However, due to the lack of understanding of the paleoclimate and paleoenvironment, the mechanism of organic ...
Yang Jian, Jiang Yuqiang, Chen Weihua, Pan Hui, Yang Xing, Li Miao, Liu Tao, Wang Zhanlei, Gu Yifan   +8 more
doaj   +1 more source

(Fig. 3c) Summer SST reconstruction for sediment core KNR140-37JPC

, 1999
(Fig.
Mark R Chapman (6967613), Cortijo, Elsa, Scott, Lehman, Lloyd D Keigwin (6961208), Chapman, Mark R, Elsa Cortijo (6963581), Keigwin, Lloyd D, Laurent D Labeyrie (6963392), Labeyrie, Laurent D, Paillard, Didier, Lehman Scott (6967610), Didier Paillard (6967616)   +11 more
core   +1 more source

STABLE CARBON AND OXYGEN ISOTOPES OF SOME CARBONATE-FLUORAPATITES FROM CENOMANIAN AND TURONIAN SEQUENCES, BOHEMIAN CRETACEOUS BASIN, CZECH REPUBLIC

Iraqi Geological Journal, 2018
Stable carbon and oxygen isotopes were analysed in the structural CO3 of carbonate-fluorapatite in phosphate nodules and coprolites present in distinctive horizons at the Cenomanian – Turonian boundary and in late Turonian sequence at the ...
Khaldoun S. Al-Bassam
doaj   +1 more source

Holocene paleoenvironmental implications of diatom and organic carbon records from the Southeastern Kara Sea (Siberian Margin) [PDF]

, 2004
Diatom assemblages and organic carbon records from two sediment cores located within an estuarian bay of the inner Kara Sea trace changes in Yenisei River runoff and postglacial depositional environments.
Stein, Rüdiger, Polyakova, Yelena I., Stein, Ruediger, Polyakova, Ye. I.   +3 more
core   +1 more source

List of benthic foraminifera species-specific equations to estimate BWT and δ¹⁸O of seawater (δ¹⁸O_SW) (δ¹⁸O_C refers to δ¹⁸O measured on the foraminifera carbonate shells) as well as BWS.

, 2022
The number in the left column refers to the regions presented in Fig 1 to which the respective equations have been applied. References: Shackleton [60]–(SK74), Cacho and colleagues [17]–(CA06), Bryan and Marchitto [13]–(BM08), Huang and colleagues [15 ...
Jürgen Titschack (4610839), Dierk Hebbeln (5293741), Claudia Wienberg (12568508), Yusuke Yokoyama (3767380), Rodrigo da Costa Portilho-Ramos (12568505), Michael Georg Siccha Rojas (12568511)   +5 more
core   +1 more source

Biostratigraphy and assigning the paleosalinity by using Echinocorys and Planktonic foraminifera at Upper Maastrichtian, in Jorband section, Central Alborz, Iran

, 2009
Jorband section is located in the north slope of central Alborz, and 28 Km south of Noor. It has been sampled and index fossilic groups of planktonic foraminifera and echinoids were studied in order to assign the paleosalinity and biozonation in central ...
Esmail Kohansal, Masood Asgharian Rostami, Behnaz Balmaki, Meysam Shafiee Ardestani   +3 more
core   +1 more source

Isotope and Mg/Ca measurements from Cores ME0005A-43JC and 202-1242 of tropical Pacific

, 2006
Multiproxy geologic records of d18O and Mg/Ca in fossil foraminifera from sediments under the Eastern Pacific Warm Pool (EPWP) region west of Central America document variations in upper ocean temperature, pycnocline strength, and salinity (i.e., net ...
Heather M Benway (6982520), Gary P Klinkhammer (6968069), Benway, Heather M, Haley, Brian A, Mix, Alan C, Klinkhammer, Gary P, Alan C Mix (6886625), Brian A Haley (6885335)   +7 more
core   +1 more source

Origin and paleoenvironmental conditions of iron duricrust in the Paleogene N’kapa Formation, Douala sub-basin, Cameroon

Geosystems and Geoenvironment
This paper unravels rarely studied paleoenvironmental conditions and origin of iron duricrust in the Paleogene N’kapa Formation, Douala sub-basin, Cameroon. It integrates petrographic and geochemical techniques (mineralogy, trace, major and REEs elements)
Kevin Jorex Voufor Tsafack, Ngong Roger Ngia, Christopher Fuanya, Christopher M. Agyingi, Elie Fosso Menkem, Alexandrine N’nanga, Median Yongye, Ligbwah Victor Wotanie   +7 more
doaj   +1 more source