Palaeomagnetic and rock magnetic study of charnockites from Tamil Nadu, India, and the ‘Ur’ protocontinent in Early Palaeoproterozoic times

Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The ∼1.8Ga LIP event and crustal consolidation in late Palaeoproterozoic times

“…Engel et al, 1974). It indicates that continental crust grew by progressive consolidation around a core of the ancient nuclei comprising 'Ur', 'Arctica' and 'Atlantica' protocontinents (Rogers 1996;Rogers and Santosh 2004) already in place by Late Archaean times (Piper, 2003(Piper, , 2010aMondal et al, 2009). This is illustrated in Fig.…”

Foundation Floor Geological Mapping of a Nuclear Reactor

“…The heterogeneous rock mass was categorized into the appropriate zones of weathering based classification given in Tables 1 and 2. 3 Geology of the Area 3.1 General of Geology PFBR is located on the coastal zone of the Bay of Bengal around 200 m from the seacoast i.e., on the east coast of peninsular India at Kalpakkam. The South Indian Shield comprises metamorphic and intrusive igneous rocks in the provinces of Kerala, Tamil Nadu, Karnataka, and Andhra Pradesh and is bisected by a west-east zone of granulitic facies terrane running from Mangalore to Madras incorporating extensive development of charnockite (Mondal et al 2009). The area is a part of the Peninsular Crystalline/Archaean complex (Poornachandra of Eastern Ghats belt, which is considered to be continuing southwards into Madras Block (Perraju et al 1979) overlain by clay and alluvium.…”

“…Generally bedrock is available between 12 to 16 m (Mondal et al 2009). The charnockite group of rocks is made up of highly quartzose, pyroxine, feldspar, and garnet rock (Ronald and Carol 2008).…”

Protopangaea: Palaeomagnetic definition of Earth's oldest (mid-Archaean-Palaeoproterozoic) supercontinent

“…The position of India within the Ur assemblage is constrained by an APW swathe defined by the range of Early Proterozoic charnockite poles (Mondal et al, 2009) and by their relationship to two ∼2.6 Ga poles from the Singhbhum Craton in the NE sector of the shield (Figs. 1 and 2); these data locate this shield immediate below Western Australia and Southern Africa.…”

“…Buchan et al, 2000;Mertanen et al, 1999;Windley, 1993a,b;Piper, 1982Piper, , 2003 that the core of the Fennoscandian Shield was part of this division by 2.5 Ga. Subsequently Laurentia and Fennoscandia also share a common geological history including Mesoproterozoic marginal accretion and anorogenic magmatism (Bridgewater and Windley, Evans et al (2002) and Hattingh (1989); h, Arestova et al (2002), i, Das et al (1996), j, Poornachandra Rao et al (1989); k, Piper et al (2003); l, Mondal et al (2009Mondal et al ( ). 1973Piper, 1980Piper, , 1987.…”