The discovery of Silurian Yuanbaoshan Formation graptolite in Wulanshangde area of Alxa Left Banner, Inner Mongolia, and its geological significance

WANG Aishun; MA Yunfei; ZHANG Baoyan; WU Lijun; ZHANG Yunxue; XING Zhiqiang; LIU Mingjun; YANG Fuguang; LIANG Zhibao; JIA Yongqi; ZHAO Jiajia; ZHANG Qiang; SUN Zechen

2019 Vol. 38, No. 6

Article Contents

Article navigation > Geological Bulletin of China > 2019 > 38(6): 950-958

Next Article Previous Article

WANG Aishun, MA Yunfei, ZHANG Baoyan, WU Lijun, ZHANG Yunxue, XING Zhiqiang, LIU Mingjun, YANG Fuguang, LIANG Zhibao, JIA Yongqi, ZHAO Jiajia, ZHANG Qiang, SUN Zechen. The discovery of Silurian Yuanbaoshan Formation graptolite in Wulanshangde area of Alxa Left Banner, Inner Mongolia, and its geological significance[J]. Geological Bulletin of China, 2019, 38(6): 950-958.

Citation:

WANG Aishun, MA Yunfei, ZHANG Baoyan, WU Lijun, ZHANG Yunxue, XING Zhiqiang, LIU Mingjun, YANG Fuguang, LIANG Zhibao, JIA Yongqi, ZHAO Jiajia, ZHANG Qiang, SUN Zechen. The discovery of Silurian Yuanbaoshan Formation graptolite in Wulanshangde area of Alxa Left Banner, Inner Mongolia, and its geological significance[J]. Geological Bulletin of China, 2019, 38(6): 950-958.

The discovery of Silurian Yuanbaoshan Formation graptolite in Wulanshangde area of Alxa Left Banner, Inner Mongolia, and its geological significance

1.
Geological Survey Institute of Inner Mongolia, Hohhot 010010, Inner Mongolia, China
2.
Inner Mongolia Branch of China National Geological Exploration Center of Building Materials Industry, Hohhot 010010, Inner Mongolia, China

More Information

Corresponding author: MA Yunfei, dizhimyf@163.com

Received Date: 17 January 2019

Revised Date: 12 March 2019

Publish Date: 15 June 2019

Abstract

Abstract

A puzzling stratum is identified as Permian Shuangbaotang Formation, which is outcropped in NE direction for 770km² on both sides of Hariaoribuge sag in northern Hangwula Mountain of Alxa Left Banner. However, the summarized lithology, rock association and sequence characteristics of strata is in contradiction with the definition, geological characteristics and regional change of Shuangbaotang Formation named by Inner Mongolian lithostratigraphic researchers. In this study, 1:50, 000 regional mineral geological survey adopted modern sedimentology theory and sequence stratigraphy working method to study rock association, basic sequence, sedimentary structure and sedimentary environment. The authors divided the strata into three lithologic section-level geological units. According to the first discovery of graptolite and the invading contact of biotite granodiorites in the Late Devonian (U-Pb/379±2.9Ma), the strata age should be Early Silurian and it was changed into Silurian Yuanbaoshan Formation.The Devonian regional deformation and metamorphic process produced low-grade metamorphism and schistositilization deformation and formed NE-trending compound syncline structure. Then it experienced superimposition ofstructural deformation and formed closed-reverse fold. The establishment of Silurian Yuanbaoshan Formation plays an important role in stratigraphic subdivision and regional tectonic evolution study.
- stratigraphic subdivision /
- rock association /
- graptolite /
- Yuanbaoshan Formation /
- Alxa League

FullText(HTML)

References

[1]	李文国, 李庆富, 姜万德, 等.内蒙古自治区岩石地层[M].武汉:中国地质大学出版社, 1996. Google Scholar
[2]	周振寰.北山地区的早志留世笔石相地层[J].西北地质, 1982, (3):3-11. Google Scholar
[3]	潘桂棠, 肖庆辉, 陆松年, 等.中国大地构造单元划分[J].中国地质, 2009, 36(1):1-28. Google Scholar
[4]	潘桂棠, 陆松年, 肖庆辉, 等.中国大地构造阶段划分和演化[J].地学前缘, 2016, 23(6):1-23. Google Scholar
[5]	何世平, 周会武, 任秉琛, 等.甘肃内蒙古北山地区古生代地壳演化[J].西北地质, 2005, (3):6-15. doi: 10.3969/j.issn.1009-6248.2005.03.002 CrossRef Google Scholar
[6]	许伟, 魏建设, 韩伟, 等.银额盆地及周缘石炭系和二叠系沉积之后构造改造初探[J].地质通报, 2018, 37(1):132-143. Google Scholar
[7]	梁国冰, 丁仨平, 李佐臣, 等.甘肃北山小西弓南早泥盆世-晚志留世糜棱岩化石英闪长岩体年代学、地球化学特征及其地质意义[J].西北地质, 2017, 50(1):249-260. doi: 10.3969/j.issn.1009-6248.2017.01.021 CrossRef Google Scholar
[8]	程海峰, 辛后田, 梁国庆, 等.内蒙古北山地区黑红山一带斑状花岗闪长岩地球化学特征、LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报, 2018, 37(10):1895-1904. Google Scholar
[9]	代文军, 龚全胜, 李海林, 等.甘肃北山南带中段志留系的发现及地质意义[J].西北地质, 2002, (3):42-47. doi: 10.3969/j.issn.1009-6248.2002.03.006 CrossRef Google Scholar
[10]	张亚波, 闫海卿, 胡雷雷, 等.内蒙古额济纳旗地区早石炭纪火山岩喷发旋回与岩石化学特征[J].西北地质, 2018, 51(3):1-15. doi: 10.3969/j.issn.1009-6248.2018.03.001 CrossRef Google Scholar
[11]	闫海卿, 陈元, 范模春, 等.内蒙古额济纳旗拐子湖地区花岗岩地球化学特征及其地质意义[J].中国工程科学, 2015, 17(2):97-105. doi: 10.3969/j.issn.1009-1742.2015.02.011 CrossRef Google Scholar
[12]	牛亚卓, 魏建设, 史冀忠, 等.甘肃北山地区北部上石炭统火山岩LA-ICP-MS锆石U-Pb年龄及其构造意义[J].地质通报, 2013, 32(11):1720-1727. doi: 10.3969/j.issn.1671-2552.2013.11.004 CrossRef Google Scholar
[13]	尹海权, 周洪瑞, 徐东卓, 等.中亚造山带中段南缘圆包山组碎屑锆石U-Pb年龄、物源及其构造演化意义[J].地质学报, 2017, 91(10):2196-2211. doi: 10.3969/j.issn.0001-5717.2017.10.004 CrossRef Google Scholar
①	曹景轩, 何显洲, 王士政 . 中华人民共和国区域地质调查报告 (1∶20万哈日奥日布格幅).1982. Google Scholar
②	曹景轩, 何显洲, 王士政.中华人民共和国区域地质调查报告(1∶20万扎敏敖包幅).1982. Google Scholar
③	董尚林, 陈长虹, 李新虎, 等 .内蒙古自治区阿拉善盟傲干奥日布格等三幅 1∶5万区域矿产调查报告 .2008. Google Scholar