Results 41 to 50 of about 139,956 (281)

The potassic sedimentary rocks in Gale Crater, Mars, as seen by ChemCam on board Curiosity [PDF]

, 2016
The Mars Science Laboratory rover Curiosity encountered potassium-rich clastic sedimentary rocks at two sites in Gale Crater, the waypoints Cooperstown and Kimberley.
Anderson, RB, Blaney, D, Clegg, S, Cousin, A, Dromart, G, Fabre, C, Fisk, M, Forni, O, Gasnault, O, Grotzinger, JP, Gupta, S, Lanza, N, Lasue, J, Le Deit, L, Le Mouelic, S, Mangold, N, Maurice, S, McLennan, SM, Meslin, P-Y, Nachon, M, Newsom, H, Payre, V, Rapin, W, Rice, M, Sautter, V, Schroder, S, Stack, KM, Sumner, D, Treiman, AH, Wiens, RC   +29 more
core   +3 more sources

Characteristics and main controlling factors of the sweet spot reservoir in the first member of Lower Shihezi Formation of well J58 in Hangjinqi area, Ordos Basin

矿业科学学报, 2022
For a long time, the characteristics and main controlling factors of the sweet spot reservoir of tight sandstone gas in the first member of the Shihezi Formation in Hangjinqi area of Ordos Basin are not clear, which restricts the natural gas productivity
Hu Huidong, Li Xianqing, Chen Chunfang, Liu Yang, Zhang Boxiang   +4 more
doaj   +1 more source

Significance of sorting in sedimentary rocks [PDF]

Geological Society of America Bulletin, 1917
Dominant Considerations and the Question Raised The facts that the grains composing most sedimentary rocks show more or less sorting, that this sorting is not uniform, either in degree or kind, and that the rocks are known to have been laid down by various agents, naturally leads to the question: To what extent may it be possible to determine, from ...
openaire   +2 more sources

A study of high-frequency strong ground motion from the San Fernando earthquake [PDF]

, 1975
This thesis describes an investigation of the attenuation of strong earthquake ground motion in the 0. 4 to 16 Hz frequency band during the M=6.4, February 9, 1971, San Fernando, California earthquake.
Berrill, John Beauchamp
core   +2 more sources

Influence of sedimentary microfacies on the rock mechanics of ultra-deep reservoirs and its application: a case study of the Cretaceous formation in the BZ gas field of Kuqa Depression, Tarim Basin

Shiyou shiyan dizhi
To optimize the identification of sweet spots with natural fracture development in ultra-deep tight sandstone reservoirs of Cretaceous in the Kuqa Depression, Tarim Basin, this study systematically analyzed the differences in rock mechanical properties ...
Zhimin WANG, Haitao SUN, Hui ZHANG, Chenguang WANG, Guoqing YIN, Ke XU, Dakang ZHONG   +6 more
doaj   +1 more source

Description and Dynamic Analyses of the 1935 Luchedu Rock Avalanche in Sichuan, China

Geofluids, 2022
The Luchedu rock avalanche (LRA) that occurred in 1935 at the junction of Sichuan and Yunnan in Southwest China is a disaster chain of the rock slide, debris avalanche, and river blocking induced by heavy rainfall.
Jie Cui, Chunyu Gao, Zhilong Zhang, Guifu Xiang   +3 more
doaj   +1 more source

Provenance history of a Late Triassic-Jurassic Gondwana margin forearc basin, Murihiku Terrane, North Island, New Zealand: petrographic and geochemical constraints [PDF]

, 2004
The Murihiku Terrane in the North Island was a forearc basin adjacent to a volcanic arc along the eastern margin of Gondwana during the Mesozoic. The rocks that infill the basin are mainly volcaniclastic sandstones and mudstones, often turbiditic, with ...
Briggs, Roger M., Middleton, Matthew P., Nelson, Campbell S.   +2 more
core   +2 more sources

Assessing the representative elementary volume of rock types by X-ray computed tomography (CT) – a simple approach to demonstrate the heterogeneity of the Boda Claystone Formation in Hungary

Geologos, 2021
X-ray computed tomography (CT) can reveal internal, three-dimensional details of objects in a non-destructive way and provide high-resolution, quantitative data in the form of CT numbers.
Abutaha Saja M., Geiger János, Gulyás Sándor, Fedor Ferenc   +3 more
doaj   +1 more source

Mechanistic Links Between the Sedimentary Redox Cycle and Marine Acid-Base Chemistry [PDF]

, 2019
The redox state of Earth's surface is controlled on geological timescales by the flow of electrons through the sedimentary rock cycle, mediated largely by the weathering and burial of C‐S‐Fe phases. These processes buffer atmospheric pO₂.
Fischer, Woodward W., Reinhard, Christopher T.   +1 more
core  

Classification of Red-Bed Rock Mass Structures and Slope Failure Modes in South China

Geosciences, 2019
Red beds are Meso−Cenozoic continental sedimentary strata that are mainly composed of gravel stone, sandstone, siltstone, mudstone, and shale and occasionally have interlayers of limestone, halite, and gypsum.
Cuiying Zhou, Xu Yang, Yanhao Liang, Zichun Du, Zhen Liu, Wei Huang, Weihua Ming   +6 more
doaj   +1 more source