| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
HE Fubing, WEI Bo, XU Jixiang, SUN Yonghua, LI Ruijie. 2017. Ages, origin and geological implications of the volcanic rocks in the Baoligaomiao Formation of East Ujimqin Banner, Inner Mongolia[J]. Geology in China, 44(6): 1159-1174. doi: 10.12029/gc20170609
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Ages, origin and geological implications of the volcanic rocks in the Baoligaomiao Formation of East Ujimqin Banner, Inner Mongolia
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Abstract
Baoligaomiao Formation is outcropped in Bayan Aobao Town of East Ujimqin Banner, Inner Mongolia. It can be divided into three segments corresponding to the second, the third and the fourth section of Chaganaobao. The second segment comprises a set of variegated intermediate-acidic volcanic lava and volcanic clasts. Volcanic eruption is mainly as extrusive facies. The third segment includes a set of Annularia fossil-bearing grayish yellow, grayish white volcanic sedimentary clasts and terrigenous sediments, being an intermittent volcanic deposit; the fourth segment has a set of gray, light-gray acidic lavas containing rare volcanic-clastic sedimentary rock. Volcanic eruption is mainly as extrusive facies. The fourth segment includes purplish red crystal rhyolite, and the second segment is grayish black rhyolite with granite age being (305±4.1) Ma and (315.2±4.6) Ma. Isotope age and the fossils suggest that the stratigraphic age is late Carboniferous to early Early Permian. Baoligaomiao Formation has intermediateacidic volcanic rock, with separate andesitic, dacite, high-K calc-alkaline to Shoshonis series volcanic association. Major elements are characterized by enrichment of SiO2 and alkali and depletion of calcium and magnesium. Indexes of A/NK and FeOt/MgO are high, characterized by enrichment of Rb, Nb and depletion of transition group elements, with dramatic Eu negative anomaly, suggesting A2 type sub-granite. It was probably the magma from the mantle and partly from conglomerate substance of the lower crust in late Paleozoic. Magmatic evolution experienced dissociation to produce titanium iron minerals, ferromagnesian minerals, and plagioclase. The intermediate-acidic volcanic rock in Baoligaomiao Formation was formed in a post-collisional setting. Its characteristics reveal that Xing'an-Mongolian orogenic belt of East Ujimqin Banner was in the syn-collision to post-collision stage during late Carboniferous to early Permian period. In Early Permian, the evolution entered a stage of stretching after collision.
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Keywords:
- Baoligaomiao Formation /
- volcanic rock /
- zircon U-Pb age /
- lithochemistry /
- tectonic setting /
- East Ujimqin Banner
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HE Fubing, WEI Bo, XU Jixiang, SUN Yonghua, LI Ruijie. 2017. Ages, origin and geological implications of the volcanic rocks in the Baoligaomiao Formation of East Ujimqin Banner, Inner Mongolia[J]. Geology in China, 44(6): 1159-1174. doi: 10.12029/gc20170609
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Figure 1.
Simplified geological map of the study area and tectonic position of the East Ujimqin Banner, Inner Mongolia (Fig. a after Xin Houtian et al.)
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Figure 2.
Plants fossils and microphotographs showing textures of the volcanic-clastic sedimentary rocks in the Baoligaomiao Formation
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Figure 3.
SiO2-(K2O+Na2O) diagram for the volcanic rocks in the Baoligaomiao Formation in East Ujimqin Banner, Inner Mongolia(afterLe Maitre, 2002)
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Figure 4.
SiO2-K2O diagram for the volcanic rocks in the Baoligaomiao Formation in East Ujimqin Banner, Inner Mongolia
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Figure 5.
Aluminous index diagrams for the volcanic rocks in the Baoligaomiao Formation in East Ujimqin Banner, Inner Mongolia (after Maniar et al., 1989)
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Figure 6.
Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams (b) for the volcanic rocks in the Baoligaomiao Formation in East Ujimqin Banner, Inner Mongolia
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Figure 7.
CL images of the zircons from the volcanic rocks in the Baoligaomiao Formation in East Ujimqin Banner, Inner Mongolia
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Figure 8.
U-Pb concordia diagrams and recalculated weighted mean 206Pb/238U ages for zircons from the volcanic rocks in the aoligaomiao Formation in East Ujimqin Banner, Inner Mongolia
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Figure 9.
Nb-Y-Ce diagram for the volcanic rocks in the Baoligaomiao Formation in East Ujimqin Banner, Inner Mongolia (after Eby, 1992)
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Figure 10.
R1-R2 diagram, Yb-Ta diagram and(Yb+Ta)-Rb diagram for the volcanic rocks in the Baoligaomiao Formation in East Ujimqin Banner, Inner Mongolia (after Batchelor R A and Pearce J A)