| Citation: |
ZHOU Guowu, LIN Min, QIU Guochun, WANG Feng. The redefinition of Xinmin Formation in Zhamuqin area of Horqin Right Wing Middle Banner of Inner Mongolia and its geological significance[J]. Geological Bulletin of China, 2018, 37(9): 1579-1587.
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The redefinition of Xinmin Formation in Zhamuqin area of Horqin Right Wing Middle Banner of Inner Mongolia and its geological significance
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Abstract
The Xinmin Formation in Zhamuqin area of Horqin Right Wing Middle Banner of Inner Mongolia were redefined by Inner Mongolia 1:50000 regional survey of four sheets such as Guonaotewula. According to lithologic combination, Xinmin Formation is divided into two lithogic sections:intermediate-acid pyroclastic rock is dominated by a small amount of pyroclastic rocks formed in lower segment overlying Linxi Formation with angular unconformity, whereas the upper part is a thick and thin clastic assemblage, which contains Pinuspollenites, Abiespollenites, Perinopollenites and some other Early-Middle Jurassic micropaleontologic fossils, with no top observed. LA-ICP-MS zircon U-Pb ages are 162.1±1.3Ma and 154.4±2.3Ma, suggesting Middle Jurassic.
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Keywords:
- Xinmin Formation /
- zircon U-Pb age /
- Middle Jurassic /
- Zhamuqin area
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References
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ZHOU Guowu, LIN Min, QIU Guochun, WANG Feng. The redefinition of Xinmin Formation in Zhamuqin area of Horqin Right Wing Middle Banner of Inner Mongolia and its geological significance[J]. Geological Bulletin of China, 2018, 37(9): 1579-1587.
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Figure 1.
Traffic location of the study area
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Figure 2.
Geological map of the study area
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Figure 3.
Sketch showing lower member of Xinmin Formation overlying Linxi Formation with angular unconformity in southeast Taolaoyan
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Figure 4.
Surveyed geological cross section of Middle Jurassic Xinmin Formation in Taolaoyan
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Figure 5.
Classification(a), sillicon-alkali relationship(b) and alkalinity diagrams of rocks(c)
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Figure 6.
AFM(a), An-Ab'-Or(b) and SiO2-K2O(c) diagrams
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Figure 7.
The frequency curves of volcanic rocks in Washingtion
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Figure 8.
Primitive mantle-normalized incompatible element spidergram
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Figure 9.
Chondrite-normalized REE patterns
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Figure 10.
Zircon CL images of Xinmin Formation (PM301-58)
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Figure 11.
Zircon U-Pb diagram of PM301-5
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Figure 12.
Zircon CL images of Xinmin Formation (PM301-104)
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Figure 13.
Zircon U-Pb diagram of PM301-104