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 Indian kimberlites
Supercontinent transition:
Links to ~1.1 Gyr diamondiferous kimberlites and related rocks in India


Ashutosh Pandey & N.V. Chalapathi Rao

Mantle Petrology Laboratory, Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221005, India, ashutosh.pandey@bhu.ac.in; nvcrao@bhu.ac.in

 

 

The generation and emplacement of kimberlites and related magmas require three circumstances (Helmstaedt & Gurney, 1997):

  1. a volatile- and incompatible-element-enriched mantle source,
  2. tectonic processes that trigger partial melting of this mantle source, and
  3. a crustal tectonic environment that controls their emplacement.
It is now widely agreed that kimberlites are derived from an isolated and homogeneous sub-lithospheric mantle reservoir (Woodhead et al., 2019). However, the tectonic process(es) triggering partial melting in such reservoirs remain unclear and diverse causative models have been proposed which include mantle plumes (e.g., Crough et al., 1980; Le Roex, 1986; Torsvik et al., 2010; Chalapathi Rao & Lehmann, 2011), passive continental extension (e.g., Moore et al., 2008; Jelsma et al., 2009), the volatile influx into the mantle as a result of subduction of oceanic plates (Helmstaedt & Gurney, 1997), lithospheric extension caused by subducting plate flexure (Zhang et al., 2019), and edge-driven convection (Kjarsgaard et al., 2017).  

The Eastern Dharwar Craton and the Bastar Craton of the Indian shield host numerous ~1.1 Gyr diamondiferous kimberlites and related rocks (ultramafic lamprophyres and lamproites) that are aligned parallel to a fold belt (Eastern Ghats Mobile Belt) (Kaur & Mitchell, 2016; Figure 1). Kumar et al. (2007) suggested a ‘short-lived mantle plume model’ to explain this widespread alkaline magmatism at ~1.1 Gyr on the basis of temporal correlation with the Warakurna, Keweenawan, and Umkondo Large Igneous Provinces (LIPs). We argue that ~1.1 Gyr kimberlites and related magmatism in southern India was more prolonged (1153-1023 Ma) than these contemporaneous LIPs, which were relatively short geological events (Warakurna: 1078-1070 Ma, Keweenawan: 1085-1117 Ma, Umkondo: 1112-1116 Ma). These circumstances do not support a mantle plume model.

 


Figure 1: Geological map of India showing ~1.1 Gyr corridor of kimberlites and related rocks which is aligned parallel to the Eastern Ghats Mobile Belt.

 

Magmatic provinces are linked to mantle plumes on the basis of age-wise linear magmatic geometry and excess mantle potential temperature. A classic example where linear geometry (>2000 km), along with age progression of kimberlites and related rocks, is observed is the Cretaceous North American kimberlites that are proposed to be an expression of the Great Meteor mantle plume hotspot track (see Heaman & Kjarsgaard, 2000). In contrast to this, the Mesoproterozoic Indian kimberlites and related rocks corridor lies parallel to a fold belt in the east, which is of considerable geodynamic significance. In fact, the emplacement ages of these rocks are consistent with a continental collision period responsible for the amalgamation of the Rodinia supercontinent. Various paleogeographic reconstructions of the Rodinia supercontinent place a Grenvillian (~1.1 Ga) orogenic belt at the easternmost Indian shield. A similar spatio-temporal correlation exists between ~520 Myr South African kimberlites that tap an ENE-WSW trending lineament parallel to the Damaran Orogenic Belt, which are concomitant with assembly of the Gondwana supercontinent (Jelsma et al., 2009).

Temperature estimates from the mantle xenoliths hosted in these kimberlites reveal that the ambient mantle was not anomalously hot, as expected for a mantle plume, when compared to numerical modelling and the actual sample-based mantle cooling curve through geological time (Figure 2). Mantle-plume-invoked protracted lithospheric heating has been noted from temperature estimates from the xenoliths hosted in the South African kimberlites (Franz et al., 1996; Bell et al., 2003; Boyd et al., 2004).

 


Figure 2: Temperature range estimated from the mantle xenoliths in the southern Indian kimberlites (Ganguly & Bhattacharya, 1987; Nehru & Reddy, 1989; Chalapathi Rao et al., 2004; Patel et al., 2009) compared to theoretical- and sample-based mantle potential temperature curves (Richter, 1988; Korenaga, 2008; Silver & Behn, 2008; Davies, 2009; Aulbach & Arndt, 2019).

 

The Eastern Dharwar Craton hosts abundant distinct Paleoproterozoic mafic dykes that were emplaced at 2.37-1.89 Ga. This was followed by a dearth in magmatic rocks for almost 400 Myr. The next episode of magmatism manifested in the form of 1.3-1.4 Gyr lamproites and subsequently 1.1 Gyr kimberlites, ultramafic lamprophyres, and lamproites. The gap in magmatism in the Eastern Dharwar Craton during the Mesoproterozoic (1.8-1.4 Ga) coincides with the life span of the Columbia supercontinent and the duration of continental lid (stable continent configuration) tectonics (Piper, 2013; Roberts, 2013). The intermittence of plate tectonics during this time period is manifested in the lack of passive margins, orogenic gold and volcanic-hosted massive sulphide deposits, and decelerated continental motions. Nevertheless, abundant anorogenic anorthosite magmatism occurred (see Cawood & Hawkesworth, 2014 and references therein). The emplacement age of the ~1.1 Gyr kimberlites and related rocks from the Indian shield, which succeed a period of tectonic quiescence, is consistent with enhanced tectonic activity leading to the amalgamation of Rodinia (Van Kranendonk & Kirkland, 2013).

We conclude that the ~1.1 Gyr kimberlites and related magmatism in India were triggered by a plate reorganization during the Columbia-to-Rodinia transition. A correlation between zircon oxygen isotopes, continental velocities and the frequency of kimberlites and related rocks support a relation between the transition from continental lid tectonics to rapid plate motions leading to supercontinent amalgamation (Rodinia at ~1200 Ma and Pannotia at ~600 Ma), and a rise in global kimberlites and associated magmatism (Figure 3).

 


Figure 3: Correlation between (a) global compilation of zircon δ18O (Van Kranendonk & Kirkland, 2013), (b) crustal root mean square velocity (νRMS) during the Precambrian (Piper, 2013), and (c) frequency of kimberlites and related rocks (Tappe et al., 2018). Dotted lines at 1200 Myr and 600 Myr represent the transition from continental lid tectonics to rapid plate motions, which is consistent with an abrupt rise in the frequency of kimberlites and related rocks.

 

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last updated 3rd August, 2020

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