Contrasting petrogenesis of spatially related carbonatites from Samalpatti and Sevattur, Tamil Nadu, India

Proterozoic Alkaline rocks and Carbonatites of Peninsular India: A review

“…Occurrences of (deformed) ARCs of Proterozoic age in India are well known for the last three decades (Santosh et al, 1989;Natarajan et al, 1994;Kumar et al, 1998;Upadhyay et al, 2006a, b;Upadhyay, 2008;Mukhopadhyay et al, 2011a;Renjith et al, 2014;Chakrabarty et al, 2016;Hippe et al, 2016;Ackerman et al, 2017;Das et al, 2018;Ranjan et al, 2018). Approximately 60 alkaline complexes including carbonatite, lamprophyre and lamproite rocks have been identified in Rajasthan, and mainly in the eastern and southern Indian states of Bihar, Odisha, West Bengal, Andhra Pradesh, Telangana, Kerala, Karnataka, and Tamil Nadu (Mazumder et al, 2000;Leelanandam et al, 2006).…”

“…Note that the carbonatite is volumetrically insignificant to the associated alkaline rocks (Ashwal et al, 2016). The ARCs have been reported from three dominant tectonic settings: continental rifts, stable intraplate setting, and collisional or suture zones in subduction settings (Woolley, 2001;Burke et al, 2003Burke et al, , 2008Leelanandam et al, 2006;Vijaya Kumar et al, 2007;Upadhyay, 2008;Woolley and Kjarsgaard, 2008;Ashwal et al, 2016;Ackerman et al, 2017;Ranjan et al, 2018). In general, majority of the alkaline rocks occur in or near the continental rifts and ocean islands.…”

Distribution and significance of rare earth elements in Cenomanian-Turonian phosphate components and mudstones from the Bohemian Cretaceous Basin, Czech Republic

“…Trace element concentrations were measured using an Agilent 7900x ICPMS, housed at the Czech Geological Survey. Basalt BHVO-2 (USGS) and REE-rich phosphate sample IC10D (Ackerman et al 2017) were measured for monitoring the instrumental bias and assessing the quality control. The results for BHVO-2 and IC10D are listed in Table 1 and are within the ranges reported by Jochum et al (2005) and Ackerman et al (2017), respectively.…”

Carbonate-rich dyke in Roztoky Intrusive Complex - an evidence for carbonatite magmatism in the Eger Rift?

“…Alternatively, the increased δ 13 C value (−2.5 ‰) could be interpreted in terms of CO 2 -rich influx. Such an overprint would result in loss of REE such as described from carbonatites in southern India (Ackerman et al 2017) but shifts towards more positive δ 18 O would likely be observed.…”

“…Intraplate silicate alkaline magmatism commonly involves carbonatites of various types (e.g., Le Bas 1977;Wooley and Kjarsgaard 2008;Chen and Simonetti 2013;Stoppa and Schiazza 2013;Ackerman et al 2017), although the nature of this relationship remains elusive. Extensive alkaline magmatism was associated with Cenozoic extension in Central and Western Europe (Wimmenauer 1974;Wilson and Downes 2006;Lustrino and Wilson 2007), including the Ohře/Eger Rift in the Bohemian Massif during the Oligocene and Miocene (e.g., Cajz et al 1999Cajz et al , 2009Holub et al 2010;Ulrych et al 2011).…”