Journal article
Geology and geochemistry of Pachmarhi dykes and sills, Satpura Gondwana Basin, central India: problems of dyke-sill-flow correlations in the Deccan Traps
Contributions to mineralogy and petrology, v 158(3), pp 357-380
01 Sep 2009
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Abstract
Many tholeiitic dyke-sill intrusions of the Late Cretaceous Deccan Traps continental flood basalt province are exposed in the Satpura Gondwana Basin around Pachmarhi, central India. We present field, petrographic, major and trace element, and Sr-Nd-Pb isotope data on these intrusions and identify individual dykes and sills that chemically closely match several stratigraphically defined formations in the southwestern Deccan (Western Ghats). Some of these formations have also been identified more recently in the northern and northeastern Deccan. However, the Pachmarhi intrusions are significantly more evolved (lower Mg numbers and higher TiO2 contents) than many Deccan basalts, with isotopic signatures generally different from those of the chemically similar lava formations, indicating that most are not feeders to previously characterized flows. They appear to be products of mixing between Deccan basalt magmas and partial melts of Precambrian Indian amphibolites, as proposed previously for several Deccan basalt lavas of the lower Western Ghats stratigraphy. Broad chemical and isotopic similarities of several Pachmarhi intrusions to the northern and northeastern Deccan lavas indicate petrogenetic relationships. Distances these lava flows would have had to cover, if they originated in the Pachmarhi area, range from 150 to 350 km. The Pachmarhi data enlarge the hitherto known chemical and isotopic range of the Deccan flood basalt magmas. This study highlights the problems and ambiguities in dyke-sill-flow correlations even with extensive geochemical fingerprinting.
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Details
- Title
- Geology and geochemistry of Pachmarhi dykes and sills, Satpura Gondwana Basin, central India: problems of dyke-sill-flow correlations in the Deccan Traps
- Creators
- Hetu C. Sheth - Indian Institute of Technology BombayJyotiranjan S. Ray - Phys Res Lab, Planetary & Geosci Div, Ahmadabad 380009, Gujarat, IndiaRanjini Ray - Indian Inst Technol, Dept Earth Sci, Bombay 400076, Maharashtra, IndiaLoyc Vanderkluysen - University of Hawaii SystemJohn J. Mahoney - University of Hawaii SystemAlok Kumar - Phys Res Lab, Planetary & Geosci Div, Ahmadabad 380009, Gujarat, IndiaAnil D. Shukla - Physical Research LaboratoryPartha Das - Indian Institute of Technology BombaySubhrashis Adhikari - Indian Institute of Technology BombayBikashkali Jana - Indian Institute of Technology Bombay
- Publication Details
- Contributions to mineralogy and petrology, v 158(3), pp 357-380
- Publisher
- Springer Nature
- Number of pages
- 24
- Grant note
- IIT Bombay EAR02-29824 / US National Science Foundation; National Science Foundation (NSF) 03IR014 / Industrial Research and Consultancy Centre (IRCC)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Web of Science ID
- WOS:000268296000004
- Scopus ID
- 2-s2.0-68349085517
- Other Identifier
- 991021015467904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Geochemistry & Geophysics
- Mineralogy