Enigma of Dangoaposi and Jagannathpur Lavas of Singhbhum Craton, Eastern India: Possible Solution
- PDF / 1,190,312 Bytes
- 7 Pages / 595 x 842 pts (A4) Page_size
- 63 Downloads / 135 Views
Enigma of Dangoaposi and Jagannathpur Lavas of Singhbhum Craton, Eastern India: Possible Solution Jyotisankar Ray1*, Satyananda Maiti1, C. Manikyamba2, Madhuparna Paul1, Payel Dey1 and Satabdi Misra1 1
Department of Geology, University of Calcutta, 35, B.C. Road, Kolkata - 700 019, India CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, India *E-mail: [email protected] 2
ABSTRACT In the Precambrian Singhbhum stratigraphy, some enigmatic aspects exist as regards to Dangoaposi and Jagannathpur lavas. The existing enigma embodies locational aspects of these lavas, structural characteristics, stratigraphic position, and geochemical affinities. Based on recent field studies by the authors and knowledge acquired from existing literature, a possible solution has been proposed in the present study, which may be followed by Precambrian geologists in order to avoid all existing confusion and dilemma. The present study clearly indicates that in Jagannathpur, there is the presence of dyke rocks only (and there is no lava) and as such stratigraphic position of Jagannathpur lava in Singhbhum Geology should be discontinued. Dangoaposi lava (described as Jagannathpur lava by some previous workers) explicitly represents a portion of western Iron Ore Group (IOG) lava and therefore, may be considered to represent a sub-domain within western IOG. INTRODUCTION The Archean-Proterozoic rock succession in India gives us important clues to understand the nature of Precambrian stratigraphic development (Saha and Mazumder, 2012). The Singhbhum North Orissa Craton of Eastern India comprises two major Precambrian crustal sub-provinces namely the ancient Singhbhum Orissa Iron Ore Craton (SOIOC) and the Proterozoic mobile belts which surround the craton in the west, north and east (Mukhopadhyay, 1988; Saha, 1994; Mahadevan, 2002; Misra, 2006; Manikyamba et al. 2015; Mukhopadhyay and Matin, 2020) (Fig. 1). The Singhbhum North Orissa Craton constitutes a Precambrian terrain covering about 40,000 sq. km. in eastern India. Geological details of this terrain have been studied for more than 150 years by numerous geologists covering different aspects, such as assessing mineral resources, structural history, and geological evolution of this region. As a consequence, knowledge of Singhbhum geology was made available to the readers in a more and more modified form from time to time. In this paper, the prevailing controversy regarding Jagannathpur and Dangoaposi lavas is presented and an attempt is made to resolve this issue on the basis of available literature and recent field and laboratory investigations. So far as the Precambrian stratigraphic succession of Singhbhum is concerned, Jagannathpur lava has traditionally been interpreted in the literature as equivalent to Malangtoli lava, Dhanjori lava and Simlipal lava (Saha et al. 1988; Saha, 1994; Sarkar and Gupta, 2012; Mukhopadhyay and Matin, 2020). Dangoaposi lava, on the other hand, has not been given a place in the stratigraphic succession of Singhbhum (Sarkar and Sa
Data Loading...
