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    Sedimentation and magmatism in the Paleoproterozoic Cuddapah Basin, India: Consequences of lithospheric extension

    Access Status
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    Authors
    Sheppard, S.
    Rasmussen, B.
    Zi, J.
    Somasekhar, V.
    Srinivasa Sarma, D.
    Ram Mohan, M.
    Krapež, B.
    Wilde, S.
    McNaughton, Neal
    Date
    2017
    Type
    Journal Article
    
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    Citation
    Sheppard, S. and Rasmussen, B. and Zi, J. and Somasekhar, V. and Srinivasa Sarma, D. and Ram Mohan, M. and Krapež, B. et al. 2017. Sedimentation and magmatism in the Paleoproterozoic Cuddapah Basin, India: Consequences of lithospheric extension. Gondwana Research. 48: pp. 153-163.
    Source Title
    Gondwana Research
    DOI
    10.1016/j.gr.2017.04.024
    ISSN
    1342-937X
    School
    John de Laeter Centre
    URI
    http://hdl.handle.net/20.500.11937/54013
    Collection
    • Curtin Research Publications
    Abstract

    The Cuddapah Basin is one of many Proterozoic, intracontinental sedimentary basins across Peninsular India. The basin comprises several unconformity-bounded successions, the lowermost of which (the Papaghni Group and overlying Chitravati Group) are intruded by dolerite sills that contact metamorphosed their host rocks. A mafic-ultramafic sill from the base of the Tadpatri Formation in the Chitravati Group was previously dated at c. 1885 Ma, and interpreted to be part of a large igneous province (LIP). We have dated two samples of a felsic tuff from the upper part of the Tadpatri Formation at 1864 ± 13 Ma and 1858 ± 16 Ma; combining data from the two samples yields a weighted mean date of 1862 ± 9 Ma. Mafic sills intrude rocks stratigraphically above the tuffaceous beds, indicating that mafic magmatism continued until after c. 1860 Ma. Given that the sills intruded lithified rocks, some of the sills may be considerably younger than 1860 Ma. Mafic volcanic rocks are also known from below the unconformity at the base of the Chitravati Group, within the basal Papaghni Group (> c. 1890 Ma). Collectively, these data indicate that mafic sill emplacement spanned more than 30 myr so that it is likely to have been a protracted event or a series of events, and, therefore unlikely to represent a LIP. The time span for mafic magmatism is more compatible with episodic, lithospheric extension (passive rifting) during basin evolution than it is with a mantle plume (active rifting).

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