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U-Pb age and Hf isotopic constraints of detrital zircons from the Himalayan foreland Subathu sub-basin on the Tertiary palaeogeography of the Himalaya

文献类型：期刊论文

作者Ravikant, Vadlamani1; Wu, Fu-Yuan2; Ji, Wei-Qiang2
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2011-04-15
卷号304期号:3-4页码:356-368
关键词Subathu sub-basin Subhimalaya foreland sedimentation detrital zircon U-Pb ages Hf isotopes
ISSN号0012-821X
DOI10.1016/j.epsl.2011.02.009
文献子类Article
英文摘要The Subhimalaya of NW India exposes a well developed marine to continental foreland sequence preserving sediments shed from the tectonically evolving Cenozoic Himalayan orogen. Detrital zircon U-Pb ages and their Hf isotopic compositions, of seven samples, were analyzed from the Subathu sub-basin foreland formations to constrain sediment provenance. The detrital zircon U-Pb age spectra yielded a similar pattern, for all foreland formations, with major peaks clustered at similar to 500-650 Ma, 900-1000 Ma and similar to 2500 Ma, corresponding to (indistinguishable) Tethyan Himalaya and Higher Himalayan Crystalline sources and those at similar to 1800-1900 Ma corresponding to lower a Lesser Himalayan arc source. Comparison of the foreland detrital zircon U-Pb age spectra with Himalayan lithotectonic source units, in conjunction with their Hf isotopes and previously determined sediment petrography and age constraints, suggest that the sediments to the flysch marine Subathu Formation (similar to 65 to > 41 Ma) were sourced from a positive-relief area of the Tethyan Himalaya mixed with detritus from lower Lesser Himalaya and additional cratonic northern Indian Precambrian rocks. No Cretaceous to Eocene-aged detrital zircons, contributed by eroding Ladakh batholith north of the Indus Tsangpo suture zone, were recorded in the Palaeogene-aged foreland samples. The younger synorogenic continental Dagshai Formation (< 30 to < 22 Ma) sediments were sourced from the very low-grade Tethyan Himalaya, whereas the alluvial-facies Kasauli Formation (< 22 to 13 Ma) began to receive sediments additionally from erosion of the medium-grade metamorphic rocks of the Higher Himalayan Crystalline and the lower Lesser Himalaya. The Lower Siwalik Formation sediments (similar to 13-11.5 Ma) were derived from the low-grade rocks of the Tethyan Himalaya, both the upper and lower Lesser Himalaya and additionally from the eroding high-grade migmatitic gneisses of the Higher Himalayan Crystalline. Thus, from the similar detrital zircon age spectra of the foreland formations, we infer that differences in the continental sediment detritus into the foreland basin reflect a straightforward sediment mixture of variable proportions from fixed Himalayan lithotectonic sources which progressively shifted towards the foreland with development of the orogen. (C) 2011 Elsevier B.V. All rights reserved.
WOS关键词MAIN CENTRAL THRUST ; NW INDIA ; TECTONIC EVOLUTION ; SEDIMENTARY PROVENANCE ; NORTHWEST HIMALAYA ; CRUSTAL EVOLUTION ; GARHWAL HIMALAYA ; BASIN SEDIMENTS ; NORTHERN INDIA ; ICP-MS
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000290839000007
出版者ELSEVIER SCIENCE BV
资助机构Chinese Academy of Sciences(KZCX2-YW-Q09-06-2) ; Chinese Academy of Sciences(KZCX2-YW-Q09-06-2) ; Chinese Academy of Sciences(KZCX2-YW-Q09-06-2) ; Chinese Academy of Sciences(KZCX2-YW-Q09-06-2) ; Chinese Academy of Sciences(KZCX2-YW-Q09-06-2) ; Chinese Academy of Sciences(KZCX2-YW-Q09-06-2) ; Chinese Academy of Sciences(KZCX2-YW-Q09-06-2) ; Chinese Academy of Sciences(KZCX2-YW-Q09-06-2)
源URL[http://ir.iggcas.ac.cn/handle/132A11/74188]  
专题中国科学院地质与地球物理研究所
通讯作者Ravikant, Vadlamani
作者单位1.Indian Inst Sci Educ & Res Kolkata, Mohanpur 741252, India
2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Ravikant, Vadlamani,Wu, Fu-Yuan,Ji, Wei-Qiang. U-Pb age and Hf isotopic constraints of detrital zircons from the Himalayan foreland Subathu sub-basin on the Tertiary palaeogeography of the Himalaya[J]. EARTH AND PLANETARY SCIENCE LETTERS,2011,304(3-4):356-368.
APA Ravikant, Vadlamani,Wu, Fu-Yuan,&Ji, Wei-Qiang.(2011).U-Pb age and Hf isotopic constraints of detrital zircons from the Himalayan foreland Subathu sub-basin on the Tertiary palaeogeography of the Himalaya.EARTH AND PLANETARY SCIENCE LETTERS,304(3-4),356-368.
MLA Ravikant, Vadlamani,et al."U-Pb age and Hf isotopic constraints of detrital zircons from the Himalayan foreland Subathu sub-basin on the Tertiary palaeogeography of the Himalaya".EARTH AND PLANETARY SCIENCE LETTERS 304.3-4(2011):356-368.

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来源：地质与地球物理研究所

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