Volume 21 Issue 4
Dec.  2015
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SUN Jiao-peng, CHEN Shi-yue, ZHUANG Yu-kai, et al., 2015. THE CLASTIC COMPOSITION CHARACTERISTICS OF UPPER PALAEOZOIC GLUTENITE IN NORTHEAST QAIDAM EDGE AND THE STRUCTURAL ATTRIBUTES OF SOURCE AREA. Journal of Geomechanics, 21 (4): 463-472.
Citation: SUN Jiao-peng, CHEN Shi-yue, ZHUANG Yu-kai, et al., 2015. THE CLASTIC COMPOSITION CHARACTERISTICS OF UPPER PALAEOZOIC GLUTENITE IN NORTHEAST QAIDAM EDGE AND THE STRUCTURAL ATTRIBUTES OF SOURCE AREA. Journal of Geomechanics, 21 (4): 463-472.

THE CLASTIC COMPOSITION CHARACTERISTICS OF UPPER PALAEOZOIC GLUTENITE IN NORTHEAST QAIDAM EDGE AND THE STRUCTURAL ATTRIBUTES OF SOURCE AREA

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  • Received: 2015-03-24
  • Published: 2015-12-28
  • Combining the microscopic analysis of one hundred and twenty-six clastic rock samples from the Upper Paleozoic in Delingha region with the petrology and sedimentology features of Maoniushan formation, Chengqianggou formation, Huaitoutala formation, Keruk formation and Zhabugaxiu formation, we concluded the provenance of the Upper Palaeozoic clastic rocks in Northeast Qaidam edge and made further discussion on the basin-mountain framework in this area. The resluts showed that fan dalta-beach barrier sedimentary system widely developed in Delingha region, the northeastern margin of Qaidam basin. The texture maturity sandstone of glutenite was low and the gravity flow was widespread with obvious evidence. The value of Q/(R+F) in each gravel layer was between 1.89 and 3.74, reflecting the low texture maturity. The clastic composition and the near-source sedimentary evidence consistently showed that the Yuka-Shaliuhe Caledonian orogenic belt was the provenance of the study area in Late Paleozoic which existed at least 195 Ma, including the uplift stage from 465 Ma to 430 Ma ago and the denudation stage between 430 Ma and 270 Ma ago. Qaidam basin and Delingha basin are two independent basin, with depositional system of opposite direction distribution. The Yuka-Shaliuhe HP-UHP metamorphic belt should be the exploration border of the Upper Paleozoic petroleum system in Delingha region.

     

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