Oligo-Miocene Depositional Environment of the Tuotuohe Basin,Central Tibetan Plateau

LIU Zhi-fei; WANG Cheng-shan; JIN Wei; YI Hai-sheng; ZHENG Hong-bo; ZHAO Xi-xi; LI Ya-lin

A continuous sedimentary record throughout Oligocene to Miocene was discovered in the Tuotuohe Basin and is considered as the most integrated Oligo-Miocene record within the Tibetan Plateau, observed so far. The record includes the Oligocene Yaxicuo Group (31.3-23.8Ma) and the EarlyMioceneWudaoliang Group (31.3-23.8Ma)with a total thickness of 2393 m. The Yaxicuo Group consists mainly of violet and reddish brown, alternating sand-stone, siltstone, and mudstone. The Wudaoliang Group consists of lacustrine marl, intramicrite, and stromatolitic limestone. The Oligo-Miocene evolution of depositional environment of the Tuotuohe Basin underwent three periods:(1) earlyOligocene, mainly fluvial environmentwith mainly northward paleocurrrent and arid paleoclimate; (2) middle-late Oligocene, mainly lacustrine environment with mainly northeastward paleocurrent and warm and humid paleoclimate; (3) latest Oligocene to earlyMiocene, lacustrine environmentwith southward paleocurrent. During the third period, the lithology changed from alternating sandstone and mudstone of the upper Yaxicuo Group to mainly marl of theWudaoliang Group, suggesting the significant shift of sediment provenance, the stable trending of tectonic movement, and the aridity of paleoclimate condition. The Oligo-Miocene paleoclimate and tectonic evolution of the Tuotuohe Basin has disp layed its significance for understanding the early up lift of the Tibetan Plateau and the global climate change.

1. Laboratory of Marine Geology, Tongji University, Shanghai 200092;

2. School of Earth Sciences, China University of Geosciences, Beijing 100083;

3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059;

4. Institute of Tectonics and Earth Sciences Department, University of California, Santa Cruz, CA 95064, USA

Received Date: 2004-08-27

Rev Recd Date: 2004-10-14

Publish Date: 2005-06-10

Key words:

Abstract: A continuous sedimentary record throughout Oligocene to Miocene was discovered in the Tuotuohe Basin and is considered as the most integrated Oligo-Miocene record within the Tibetan Plateau, observed so far. The record includes the Oligocene Yaxicuo Group (31.3-23.8Ma) and the EarlyMioceneWudaoliang Group (31.3-23.8Ma)with a total thickness of 2393 m. The Yaxicuo Group consists mainly of violet and reddish brown, alternating sand-stone, siltstone, and mudstone. The Wudaoliang Group consists of lacustrine marl, intramicrite, and stromatolitic limestone. The Oligo-Miocene evolution of depositional environment of the Tuotuohe Basin underwent three periods:(1) earlyOligocene, mainly fluvial environmentwith mainly northward paleocurrrent and arid paleoclimate; (2) middle-late Oligocene, mainly lacustrine environment with mainly northeastward paleocurrent and warm and humid paleoclimate; (3) latest Oligocene to earlyMiocene, lacustrine environmentwith southward paleocurrent. During the third period, the lithology changed from alternating sandstone and mudstone of the upper Yaxicuo Group to mainly marl of theWudaoliang Group, suggesting the significant shift of sediment provenance, the stable trending of tectonic movement, and the aridity of paleoclimate condition. The Oligo-Miocene paleoclimate and tectonic evolution of the Tuotuohe Basin has disp layed its significance for understanding the early up lift of the Tibetan Plateau and the global climate change.

HTML

Reference (1)

[1]

1 Tapponnier P,Xu Z,Roger F. Oblique stepwise rise and growth of the Tibet Plateau[J].Science,2001.1671-1677.doi:10.1126/science.105978.

2 Liu Z,Wang C. Facies analysis and depositional systems of Cenozoic sediments in the Hoh Xil basin, northern Tibet[J].Sedimentary Geology,2001.251-270.

3 Liu Z,Zhao X,Wang C. Magnetostratigraphy of Tertiary sediments from the Hoh Xil Basin:implications for the Cenozoic tectonic history of the Tibetan plateau[J].Geophysical Journal of International,2003,(2):233-252.

4 Liu Z,Wang C,Yi H. Evolution and mass-balance in the Cenozoic Hoh Xil basin, northern Tibet[J].Journal of Sedimentary Research,2001.971-984.

5 刘志飞,王成善,伊海生. 可可西里盆地新生代沉积演化历史重建[J].地质学报,2001,(02):250-258.

6 刘志飞,王成善,伊海生. 青藏高原北部可可西里盆地早新生代沉降史及其高原隆升意义[A].北京:地质出版社,2002.111-119.

7 刘志飞,王成善. 青藏高原北部可可西里盆地第三纪风火山群沉积环境分析[J].沉积学报,2001,(01):28-36.

8 刘志飞,Lachlan K Stewart. 图形显示和比较古水流数据的一种软件(PC99):以青藏高原北部可可西里盆地新生代古水流数据为例[J].沉积学报,2002,(02):354-358.

9 Wang C,Liu Z,Yi H. Tertiary crustal shortening and peneplanation in the Hoh Xil region:implications for the tectonic history of the northern Tibetan plateau[J].Journal of Asian Earth Sciences,2002.211-223.

10 Liu Z,Wang C,Zhao X. Oligo-Miocene evolution of the Tuotuohe Basin (headwaters of the Yangtze River) and its significance for the uplift history of the central Tibetan Plateau. Abstracts of the 19th Himalaya-Karakoram-Tibet Workshop, 2004, Niseko, Japan[J].Himalayan Journal of Science,2004.201.

11 青海省地质矿产局. 青海省区域地质志[M].北京:地质出版社,1991.1-662.

12 青海省地质矿产局. 青海省岩石地层[M].武汉:中国地质大学出版社,1997.287-292.

13 刘志飞,王成善. 可可西里盆地早渐新世雅西措群沉积环境分析及古气候意义[J].沉积学报,2000,(03):355-361.

14 Liu Z,Wang C,Trentesaux A. Paleoclimate changes during early Oligocene in the Hoh Xil region, northern Tibetan Plateau[J].Acta Geologica Sinica,2003,(04):504-513.

15 Liu Z,Wang C. Oil shale in the Tertiary Hoh Xil Basin, northern Qinghai-Tibet Plateau[J].AAPG Bulletin,1999.1890.

16 Cande S C,Kent D V. Revised calibration of the geomagnetic polarity time-scale for the Late Cretaceous and Cenozoic[J].Journal of Geophysical Research,1995.6093-6095.

17 Miall A D. Lithofacies types and vertical profile models in braided river deposits: a summary[A]. 1978. 597-604.

18 Miall A D. Principles of sedimentary basin analysis[M].New York: Springer-Verlag,1984.1-668.

19 刘志飞,王成善,金玮. 可可西里盆地早渐新世雅西措群爬升沙纹层理及其沉积环境意义[J].沉积学报,2004,(04):560-565.

20 Zachos J,Pagani M,Sloan L. Trends, rhythms, and aberrations in global climate 65 Ma to present[J].Science,2001.686-693.

21 Guo Z T,Ruddiman W F,Hao Q Z. Onset of Asian desertification by 22 Myr ago inferred from loess deposits in China[J].Nature,2002.159-163.

Oligo-Miocene Depositional Environment of the Tuotuohe Basin,Central Tibetan Plateau

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Proportional views

Related