...Figure 2. Photos of colorful claystones: (a) dark claystone of the Yanchang Formation (Chang 7) from the well Zhang 22, 1569.70 m; (b) gray-dark claystone of the Yanchang Formation (Chang 10) from the well Ning 93, 2003.53 m; (c) gray claystone of the Zhifang Formation from the well Zheng 78...

... to anthracite ( Teichmüller, 1974 ; Hood et al., 1975 ). Within about three-fourths of the area of the basin, the R o value is greater than 2% ( Figure 1 ). Six core samples of the Upper Triassic Yanchang and Middle Triassic Zhifang formations from well Q36, and one core sample of the Upper Permian...

... with limestone and volcanic materials. There are many Ordovician–Early Devonian granitoid intrusions distributed in the Yemaquan arc ( Fig. 1B ), accompanied by the occurrence of several Silurian thickened crust–derived adakitic plutons, such as the southern Kulankazigan, northern Zhifang, and northern Balikun...

... two beds of red tuff. In the Early Triassic there was a gap in sedimentation. Middle and Upper Triassic deposits are widespread on the western margin of the Ordos Basin. The Middle Triassic Zhifang Formation is composed of rocks of fluviolacustrine deltaic facies, mainly gray sandstones...

..., the major part of the Alxa ancient block, on the western side of this fault belt, was a long-term uplift, without Permian, Triassic, or early Jurassic deposition. However, the Ordos Basin, on the eastern side of this fault belt, contains the upper Triassic Zhifang and Yanchang Formations. The eastern side...

...Figure 5. Representative photographs showing stratigraphy, petrology, and sedimentology of Triassic strata in the study area. (A) Para-unconformity intervening between the Middle Triassic Zhifang Formation and the underlying Upper Permian Shiqianfeng Formation at the Rujigou section. (B...

... of graphite in the formation of unconformity-related uranium deposits of the Athabasca Basin, Canada: A case study of Raman spectroscopy of graphite from the world-class Phoenix uranium deposit Hao Song, Guoxiang Chi, Kewen Wang, Zenghua Li, Kathryn M. Bethune, Eric G. Potter, and Yongxing Liu 2128 APPLIED...

... incipient weathering: Insights into the role of groundwater in the formation of regolith-hosted REE deposit Jingzhao Dou, Christina Yan Wang, and Zisong Zhao article 69 DOKLADY EARTH SCIENCES Vol. 512, September 2023 Long evolution of a magmatic ore system of the Muruntau gold deposit, Western Uzbekistan...

... deposit (southern Kamchatka) K.O. Shishkanova, V.M. Okrugin, and T.M. Filosofova 142 Vol. 66, No. 2, 2024 Fluid migration regimes during the formation of the unconformityrelated Uranium deposits of the Alligator Rivers uranium field, Australia A.A. Pek, V.I. Malkovsky, and V.A. Petrov Conditions...

... SCIENCE LETTERS Vol. 584, 2022 Abiotic anoxic iron oxidation, formation of Archean banded iron formations, and the oxidation of early Earth Matthew S. Dodd, Haiyang Wang, Chao Li, Martyn Towner, and Dominic Papineau article 117469 GEOCHIMICA ET COSMOCHIMICA ACTA Vol. 325, 2022 Yttrium speciation...

... = total organic carbon; T 2 z = Middle Triassic Zhifang Formation; T 3 y = Upper Triassic Yanchang Formation. ...

.... Li S. X. You J. X. , 2017 , Geochemical characteristics and environmental implications of trace elements of Zhifang Formation in Ordos Basin : Acta Sedimentologica Sinica , 35 , 1265 – 1273 . Wang T. G. , 2002 , Discrimination and stipulation of some terms of molecular organic...

..., and fluvial sedimentary systems ( Fig. 1A ; Liu et al., 2013 , 2015 ; Zhao et al., 2020b ). The Triassic strata in the region primarily comprise the Liujiagou, Heshanggou, Zhifang, and Yanchang formations ( Fig. 1B ). Jurassic strata in the southern Ordos Basin unconformably overlie the Yanchang Formation...

... AND PETROLOGY Vol. 175, No. 1, 2020 Feldspar thermometry in pegmatites: Truth and consequences David London and Lindsey E. Hunt article:8 DOKLADY EARTH SCIENCES Vol. 489, No. 1, 2019 The unique role of pore water in lateritic bauxite formation, Republic of Guinea M.A. Makarova, V.I. Mamedov, Y.V. Alekhin...

...Xinhai Hu; Minghui Lu; Hong Cao; Zhifang Yang; Jianyong Song Abstract The Ordos Basin is located in the western part of the North-China Platform, where China’s largest shale oil field was discovered. Most of the production originates from relatively thin and tight sand bodies within the Chang 7...