...Zailin Chen; Zeming Shi; Shijun Ni; Junchun Hu Abstract This paper attempts to review the environmental geochemical characteristics (re.: enriched elements) in coals of the Late Permian Xuanwei Formation of NW Yunnan, China, and gauge the possible existence of significant relationships...

...JASON HILTON; WANG SHI-JUN; JEAN GALTIER; IAN GLASSPOOL; LIL STEVENS Abstract A new permineralized fossil plant assemblage is described from volcaniclastic tuff collected in the Upper Permian (Wuchiapigian to Changhsingian) Xuanwei Formation at Shanjiaoshu mine, Guizhou Province, China...

... facies of the Xuanwei and Kayitou Formations ( Chu et al., 2016 ; Zhang et al., 2016 ). The former consists of sandstone, mudstone, and common coal beds. The associated plant fossils belong to the Gigantopteris flora and include pecopterids, gigantopterids, lycopsiales, and equisetales taxa...

... these ashes to the early Wuchiapingian. Those altered ashes are geochemically akin to alkali tonsteins from the coal seams of the lower Xuanwei/Lungtan Formation in southwest China. The ashes postdating the GLB yield a coherent cluster of zircon U-Pb ages with weighted mean 206 Pb/ 238 U ages of 258.82 ± 0.61...

... is not younger than, or likely entirely Capitanian of the Guadalupian Epoch of the Permian. Yunnanospora radiata was reported only from the upper part of the Xuanwei Formation of the Lopingian Permian of Yunnan (Ouyang 1982 , 1986 ). Its occurrence in our material might indicate its occasional...

... . Cu concentrations are plotted along with values normalized to Al, to account for potential lithologic changes, and to TOC, given that Cu bonds with organic matter in terrestrial plants and soil. Cu values are relatively constant from the Xuanwei Formation to the base of the Kayitou Formation...

... Formation. c , LDEM01 profile. An arrow denotes clay stones along the boundary of the paleosols and the Xuanwei Formation. d , LDXW03 profile. The top of the profile is modern soils. e , LJBP38 profile, which is offset as a result of fault activities during the late period. ...

... Coal Geology Bureau 1996 ; Liu 2005 ). The Changxing Formation contains four unminable coalbeds (nos. 1, 2, 3, and 4). The strata of the Longtan and Changxin Formations in the western part of the Zhaotong Coalfield are named the Xuanwei Formation (P 2xw ), as shown in Figure 1a . F igure 1...

... Formation; Gl, Guanling Formation; Lh, Linghao Formation; Ll, Luolou Formation; Lm, Lanmu Formation; Lz, Longzhang Formation; Sd, Sidazhai Formation; Sp, Shipao Formation; Sw, Shaiwa Formation; Xw, Xuanwei Formation; Xy, Xinyuan Formation; Yl, Yongli Formation; Ylj, Yangliujing Formation; Yn, Yongningzhen...

... are named on the basis of the difference of the lithologic properties of rocks. The Longtan Formation and Wangjiazhai Formation are the main coal-bearing formations in western Guizhou. The Longtan Formation is stratigraphically equivalent to the lower part of the Xuanwei Formation in the study area...