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Article Navigation >  Acta Sedimentologica Sinica  > 2002  >  20(2): 229-237

YU YuanJiang, SUN JingMin, ZHU QingZhong, YANG Bing, SHEN JunShan, LIU XianBin, HAN ChunMing. Preliminary Research on the Mesozoic Lithofacies-Palaeogeography in the Chalangla Area, Qiangtang Basin, Northern Tibet[J]. Acta Sedimentologica Sinica, 2002, 20(2): 229-237.
Citation: YU YuanJiang, SUN JingMin, ZHU QingZhong, YANG Bing, SHEN JunShan, LIU XianBin, HAN ChunMing. Preliminary Research on the Mesozoic Lithofacies-Palaeogeography in the Chalangla Area, Qiangtang Basin, Northern Tibet[J]. Acta Sedimentologica Sinica, 2002, 20(2): 229-237.
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Preliminary Research on the Mesozoic Lithofacies-Palaeogeography in the Chalangla Area, Qiangtang Basin, Northern Tibet

  • 1.

    China University of geoscience, Beijing 100083;

  • 2.

    Instit ute of Petroleum Exploration and development Petrochina, Beijing 100083;

  • 3.

    Huabei Oilfield fift h Extraction factory, RenIiu Hebei 062552;

  • 4.

    Huabei Oilfield Research Instit ute, RenIiu Hebei 062552

  • Received Date: 2001-02-26
  • Rev Recd Date: 2001-06-04
  • Publish Date: 2002-04-10
  • For the first time, the paper systematically rebuilds the Mesozoic lithofacies and palaeogeography in the Chalangla area of Qiangtang Basin in Northern Tibet by using methods of stratigraphically dominant facies/subfacies and integrated analyses. This is on the basis of the measured sections and route geologic survey profiles as well as sedimentary facies analyses. Marine-continental transition facies were dominant in Late Triassic, forming regression sedimentary cycles and consequently developing delta facies, coastal facies, and littoral-neritic facies belt from NE towards SW. In the Middle Jurassic epoch developed neritic facies deposits, consequently delta-platform-neritic continental shelf facies occurred from NE towards SW and displayed in NWW～SEE direction. Twice marine transgression peaks occurred at J2 q Period and J2 b Period,and constituted two sedimentary cycles from marine ingression to regression. In the Late Jurassic epoch developed sea-continental transitional facies,which were delta, tidal flat, platform facies belts and displayed in NW～SE direction.In the Cretaceous period discrepancy in lithofacies and palaeogeography was present from the early to late. In the early stage developed platform edge shallow facies to restricted platform facies on the background of remnant sea, which formed the third marine transgression peak. After rapid overall swelling, in the late stage occurred alluvial fan-braided river facies sedimentary cycles made of red polyterrigenous molasse deposits with multi-source supplying. The Mesozoic provenance was mainly the central uplift belt in the north, and secondly the highland in the east and uplift region in the west. In the process of sedimentary evolution, sedimentary source areas were different in different geologic ages, and the terrain in general,was characteristic of being higher in north and east but lower in south and west.
  • [1] 1. 朱同兴。从弧后盆地到前陆盆地的沉积演化-以西藏北部羌塘中生代盆地分析为例[A].特提斯地质[C].北京:地质出版社，1999,23号:1～15 [Zhu Tongxing.Sedimentary Evolution from Back-arc to Foreland Basin: An Example from the Qiangtang Mesozoic Basin in Northern Xizang[A].Tethyan Geology[C].Beijing: Geological Publishing House,1999,No.23:1～15 ]

    2. 李勇，伊海生，王成善。青藏高原北部晚三叠世Epigondollella动物群的发现及其地质意义[J].地质论评，1999,45（4）:628 [Li Yong,Yi Haisheng,Wang Chengshan.The Discovery and its Geologic significance of Epigondollella fauna at late Triassic epoch in Northern Qinghai-Tibet Plateau[J].Geological Review,1999,45（4）:628 ]

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    8. 蒋忠锡。羌塘地区侏罗纪地层若干问题[A].青藏高原地质文集（3）[C].北京:地质出版社，1983.87～112 [Jiang Zhongxi.Some Problems on the Jurassic Stratigraphy of Qiangtang Region[A].Contribution to The Geology of The Qinghai-Xizang（Tibet） Plateau [C],No.3,Beijing: Geological Publishing House,1983,87～112 ]

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  • Received:  2001-02-26
  • Revised:  2001-06-04
  • Published:  2002-04-10

Preliminary Research on the Mesozoic Lithofacies-Palaeogeography in the Chalangla Area, Qiangtang Basin, Northern Tibet

  • 1. China University of geoscience, Beijing 100083;
  • 2. Instit ute of Petroleum Exploration and development Petrochina, Beijing 100083;
  • 3. Huabei Oilfield fift h Extraction factory, RenIiu Hebei 062552;
  • 4. Huabei Oilfield Research Instit ute, RenIiu Hebei 062552
  • Received Date: 2001-02-26
  • Rev Recd Date: 2001-06-04
  • Publish Date: 2002-04-10

Abstract: For the first time, the paper systematically rebuilds the Mesozoic lithofacies and palaeogeography in the Chalangla area of Qiangtang Basin in Northern Tibet by using methods of stratigraphically dominant facies/subfacies and integrated analyses. This is on the basis of the measured sections and route geologic survey profiles as well as sedimentary facies analyses. Marine-continental transition facies were dominant in Late Triassic, forming regression sedimentary cycles and consequently developing delta facies, coastal facies, and littoral-neritic facies belt from NE towards SW. In the Middle Jurassic epoch developed neritic facies deposits, consequently delta-platform-neritic continental shelf facies occurred from NE towards SW and displayed in NWW～SEE direction. Twice marine transgression peaks occurred at J2 q Period and J2 b Period,and constituted two sedimentary cycles from marine ingression to regression. In the Late Jurassic epoch developed sea-continental transitional facies,which were delta, tidal flat, platform facies belts and displayed in NW～SE direction.In the Cretaceous period discrepancy in lithofacies and palaeogeography was present from the early to late. In the early stage developed platform edge shallow facies to restricted platform facies on the background of remnant sea, which formed the third marine transgression peak. After rapid overall swelling, in the late stage occurred alluvial fan-braided river facies sedimentary cycles made of red polyterrigenous molasse deposits with multi-source supplying. The Mesozoic provenance was mainly the central uplift belt in the north, and secondly the highland in the east and uplift region in the west. In the process of sedimentary evolution, sedimentary source areas were different in different geologic ages, and the terrain in general,was characteristic of being higher in north and east but lower in south and west.

YU YuanJiang, SUN JingMin, ZHU QingZhong, YANG Bing, SHEN JunShan, LIU XianBin, HAN ChunMing. Preliminary Research on the Mesozoic Lithofacies-Palaeogeography in the Chalangla Area, Qiangtang Basin, Northern Tibet[J]. Acta Sedimentologica Sinica, 2002, 20(2): 229-237.
Citation: YU YuanJiang, SUN JingMin, ZHU QingZhong, YANG Bing, SHEN JunShan, LIU XianBin, HAN ChunMing. Preliminary Research on the Mesozoic Lithofacies-Palaeogeography in the Chalangla Area, Qiangtang Basin, Northern Tibet[J]. Acta Sedimentologica Sinica, 2002, 20(2): 229-237.
shu

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