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Xiagou Formation

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Series: Geological Society, London, Special Publications
Published: 01 January 2013
DOI: 10.1144/SP382.1
EISBN: 9781862396463
...‰. Carbon isotope chemostratigraphy can significantly aid the correlation of continental strata. The δ 13 C org curves of two profiles within lacustrine strata of the Xiagou Formation are characterized by a negative excursion followed by a large increase in δ 13 C of c. 12.5‰. Chemostratigraphic profiles...
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Journal Article
Published: 18 May 2006
Canadian Journal of Earth Sciences (2006) 43 (5): 547-554.
...Jerald D. Harris; Matthew C. Lamanna; Hai-lu You; Shu-an Ji; Qiang Ji Abstract A new specimen of an enantiornithean bird from the Lower Cretaceous Xiagou Formation of Gansu Province, northwestern China, consists of an articulated distal left humerus, ulna, radius, carpus, and manus. The specimen...
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XRD scans for examples of dolomite and calcite in the <b>Xiagou</b> <b>Formation</b> carb...
Published: 01 May 2017
Figure 4 XRD scans for examples of dolomite and calcite in the Xiagou Formation carbonates. Note the most intense calcite peak at 29.4 °2θ in sample CBBQ-43. The dolomite peak occurs higher, at 30.8 °2θ. Dolomite reference scan is from dolomite recovered in Lawrence, Arkansas, U.S.A. ( rruff.info
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Stable isotope and temperature data from the <b>Xiagou</b> <b>Formation</b>.
Published: 01 May 2017
Table 1 Stable isotope and temperature data from the Xiagou Formation.
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Macrofacies, microfacies, and CL characteristics of <b>Xiagou</b> <b>Formation</b> sample...
Published: 01 May 2017
Table 2 Macrofacies, microfacies, and CL characteristics of Xiagou Formation samples from the Changma fossil bird locality.
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Chondrite-normalized REE patterns of the (a) Zhonggou <b>Formation</b>, (d) <b>Xiagou</b>...
Published: 08 April 2019
Figure 6. Chondrite-normalized REE patterns of the (a) Zhonggou Formation, (d) Xiagou Formation redbeds, and (g) Chijinbao Formation; PAAS-normalized REE patterns of the (b) Zhonggou formation, (e) Xiagou Formation redbeds, and (h) Chijinbao Formation; and UCC-normalized REE patterns of the (c
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Comprehensive stratigraphic column of the lower Cretaceous <b>Xiagou</b> and Zhong...
Published: 03 July 2019
Figure 2. Comprehensive stratigraphic column of the lower Cretaceous Xiagou and Zhonggou Formations in the northwestern Jiuquan Basin.
Journal Article
Published: 19 June 2014
Geological Magazine (2014) 152 (1): 166-175.
... Q. , Li D. & You H.-L. 2013 b . A new turtle from the Xiagou Formation (Early Cretaceous) of Changma Basin, Gansu Province, P. R. China . Palaeobiodiversity...
FIGURES
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Plot of Th/U versus Th for the mudstone samples (after  McLennan et al., 19...
Published: 08 April 2019
Figure 9. Plot of Th/U versus Th for the mudstone samples (after McLennan et al., 1993 ) showing moderate weathering of the Chijinbao-Xiagou Formations and slight weathering of the Zhonggou Formation.
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(a) Plotted in the       M    +    -  4  Si  -    R    2  +       system, t...
Published: 08 April 2019
and the upper part of the Xiagou Formation plot around the corner of the weathered basalt domain area. (b) The Δ 4 Si % parameter is calculated using the AUCC compositions for the lower part of the Xiagou and Chijinbao Formations ( 4 Si % = 39.8 % ). Most of the compositions (no illite
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Tectonic discrimination plots of (a)      SiO  2      versus      K  2   O ...
Published: 08 April 2019
and Korsch (1986) . OIA, oceanic island arc; ACM, active continental margin; PM, passive margin; A1, arc setting, basaltic and andesitic detritus; A2, evolved arc setting, felsitic-plutonic detritus. The upper part of the Xiagou Formation includes five samples (MC1-11–MC1-15), and the lower part
Journal Article
Journal: Interpretation
Published: 08 April 2019
Interpretation (2019) 7 (2): T525-T545.
...Figure 6. Chondrite-normalized REE patterns of the (a) Zhonggou Formation, (d) Xiagou Formation redbeds, and (g) Chijinbao Formation; PAAS-normalized REE patterns of the (b) Zhonggou formation, (e) Xiagou Formation redbeds, and (h) Chijinbao Formation; and UCC-normalized REE patterns of the (c...
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Journal Article
Journal: Interpretation
Published: 03 July 2019
Interpretation (2019) 7 (3): T625-T636.
...Figure 2. Comprehensive stratigraphic column of the lower Cretaceous Xiagou and Zhonggou Formations in the northwestern Jiuquan Basin. ...
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Outcrops and cores showing the sedimentary characteristics of the lower Cre...
Published: 08 April 2019
. The high-angle fractures in the grayish-green mudstone are filled by purplish-red mudstone. (f) A vertical fracture in the core of the Xiagou Formation from well MC1.
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Plane-polarized light and cross-polarized light photomicrographs of represe...
Published: 01 May 2017
Figure 5 Plane-polarized light and cross-polarized light photomicrographs of representative categories of microfacies from the Xiagou Formation at the Changma fossil bird locality. A) Plane-polarized light and B) cross-polarized light images of CBBQ-2 (see Fig. 3 for macroscopic images
Journal Article
Published: 07 December 2017
Geological Magazine (2017) 156 (3): 533-546.
... . Chen , S. , Wang , H. , Wei , J. , Lv , Z. , Gan , H. & Jin , S. 2014 . Sedimentation of the Lower Cretaceous Xiagou Formation and its response to regional tectonics in the Qingxi Sag, Jiuquan Basin, NW China . Cretaceous Research 47 , 72 – 86 . Choi , K. S...
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Journal Article
Published: 01 January 2014
Journal of Paleontology (2014) 88 (1): 99-108.
..., and straight. The acromion is strikingly robust and about the same width as the proximal scapula; it is roughly rectangular and slightly expanded omally. The acromion appears most similar to that of an unnamed enantiornithine bird described from Xiagou Formation (Early Cretaceous age and proposed...
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Journal Article
Published: 01 May 2017
Journal of Sedimentary Research (2017) 87 (5): 486-499.
...Figure 4 XRD scans for examples of dolomite and calcite in the Xiagou Formation carbonates. Note the most intense calcite peak at 29.4 °2θ in sample CBBQ-43. The dolomite peak occurs higher, at 30.8 °2θ. Dolomite reference scan is from dolomite recovered in Lawrence, Arkansas, U.S.A. ( rruff.info...
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Series: Geological Society, London, Special Publications
Published: 01 January 2013
EISBN: 9781862396463
... of organic matter, lake level fluctuations, productivity, salinity and pH. Suarez et al. (2013 a ) examine two sections from the Early Cretaceous lacustrine strata of the Xiagou Formation, Changma Basin in Gansu Province, China. Because detailed temporal relationships in this region are lacking...
Series: Geological Society, London, Special Publications
Published: 01 January 2013
DOI: 10.1144/SP373.5
EISBN: 9781862396364
... , Early Cretaceous Xiagou Formation; E b , Palaeogene Baiyanghe Formation; N s , Neogene Shulehe Formation; Q 1 , Early Quaternary; Q 2–4 , Late Quaternary. The NE Tibetan Plateau is the furthest topographic and deformation edge of the Tibetan Plateau and is characterized by the overall features...
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