Felsic dykes in the Neoproterozoic Nagar Parkar Igneous Complex, SE Sindh, Pakistan: geochemistry and tectonic settings

  • Tahseenullah KhanEmail author
  • Mamoru Murata
  • M. Qasim Jan
  • Hafiz Ur Rehman
  • Muhammad Zafar
  • Hiroaki Ozawa
  • Anwar Qadir
  • Saqib Mehmood
Original Paper


The Nagar Parkar Igneous Complex consists of Neoproterozoic igneous and metamorphic rocks dissected by mafic, felsic, and rhyolitic dykes. The latter can be classified broadly into porphyritic felsic dykes intruding gray and pink granites at Nagar Parkar and the surrounding areas, and the orthophyric felsic dykes intruding amphibolites, deformed pink granites, and the alkaline mafic dykes in the Dhedvero area, north of Nagar Parkar. The porphyritic felsic dykes are composed of perthites, quartz, and albitic plagioclase whereas the orthopheric felsic dykes contain K-feldspar (dominant), plagioclase, and minor quartz. Geochemically, the porphyritic and orthophyric felsic dykes are subalkaline and alkaline demonstrating post-orogenic A2- and OIB-A1-type characteristic on Nb–Y–Ce and Nb–Y–3Ga ternary plots, respectively. One orthophyric felsic dyke contains normative acmite and sodium metasilicate. This study suggests two distinct tectonic regimes for the origin of the felsic dykes of the area. The porphyritic felsic dykes show similarities with the ~800–700 Ma granites of the area, the rhyolite dykes of the Mount Abu, western Rajasthan in India, and the granites of the Seychelles microcontinent. The orthophyric felsic dykes show chemical resemblance with the Tavidar volcanic suite of western Rajasthan and the Silhouette and North islands of the Seychelles microcontinent. This study confirms spatial and temporal links among the Rodinian fragments exposed in the Nagar Parkar area of Pakistan, western Rajasthan of India, and the Seychelles microcontinent.


Nagar Parkar Felsic dykes Petrogenesis Rodinian fragments 



We are thankful to the President of the Naruto University of Education, National University Corporation, Naruto, Tokushima, Japan and Rector of the Bahria University, Pakistan for facilitating this research study in Japan. We are also obliged to Drs. K. Yokoyama and M. Shigeoka, National Museum of Nature and Science, Tokyo and Dr. Goto, A., University of Hyogo, Japan for the U–Th–Pb EPMA analysis. Thanks are also extended to anonymous reviewers for their valuable suggestions for the improvement of the manuscript.


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Copyright information

© Saudi Society for Geosciences 2017

Authors and Affiliations

  • Tahseenullah Khan
    • 1
    Email author
  • Mamoru Murata
    • 2
  • M. Qasim Jan
    • 3
  • Hafiz Ur Rehman
    • 4
  • Muhammad Zafar
    • 1
  • Hiroaki Ozawa
    • 5
  • Anwar Qadir
    • 6
  • Saqib Mehmood
    • 1
  1. 1.Department of Earth and Environmental SciencesBahria UniversityIslamabadPakistan
  2. 2.Department of Geosciences, Faculty of Science, Naruto University of EducationNational University CorporationNarutoJapan
  3. 3.National Centre of Excellence in GeologyUniversity of Peshawar and COMSTECH IslamabadPeshawarPakistan
  4. 4.Department of Earth and Environmental Science, Faculty of ScienceKagoshima UniversityKagoshimaJapan
  5. 5.International Cooperation Center for the Teacher Education and TrainingNaruto University of EducationNarutoJapan
  6. 6.Department of GeologyHaripur UniversityHaripurPakistan

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