Geology and tectonic history of the Lohit Valley, Eastern Arunachal Pradesh, India

Two-stage cooling history of pelitic and semi-pelitic mylonite (sensu lato) from the Dongjiu–Milin shear zone, northwest flank of the eastern Himalayan syntaxis

“…11), immediately after changing its approximately E-W-oriented strike through the eastern Himalaya to an approximately N-S strike (west-dipping) orientation. Notably, the STD and THS do not reappear on the eastern side of the syntaxis (Gururajan and Choudhuri, 2003), which exposes GHSequivalent units (Yin, 2006), supporting the interpretation that the STD is an upper-crustal structure only.…”

Tectonic studies and crustal shortening across Easternmost Arunachal Himalaya

“…Survey of India toposheets 82 P/14 and 82 P/15 on scale 1:50,000 were used as the base map for mapping. The mapped data were correlated and integrated with previously published geological maps (Gururajan and Choudhuri, 2003;Misra, 2009) and seismic studies (Mitra et al, 2010;Hazarika et al, 2012) of the area.…”

“…1). The KGR contain high-grade gneissic rocks which lie on eastern side of TMB schist and are Gururajan and Choudhuri, 2003;Misra, 2009). assumed to be northern continuation of the MMB .…”

“…A group of researchers believed that the Eastern Arunachal block (Mishmi Block) is a continuation of the Western Arunachal Himalaya and metamorphic rocks from the Indian Plate occurs structurally below the Indus-Yarlung-Tsangpo Suture (Gansser, 1964;Thakur and Jain, 1975;Acharyya, 1980;Singh and Chowdhury, 1990;Burg et al, 1998;DiPietro and Pogue, 2004;Misra, 2009).While another group considers the Eastern Arunachal block (Mishmi Block) as a part of Eurasian Plate (Mogok Metamorphic Belt, MMB) (Gururajan and Choudhuri, 2003;Sarma et al, 2009). Subsequently, Gururajan and Choudhuri (2003), tectonically divided the area into three units, the Mishmi Crystallines as an extended part of the Eastern Himalaya; the Eastern Belt of Lohit Plutonic Complex (LPC) as northward directed extension of MMB of the Central part of Myanmar and Western Belt as part of the Gangdese Batholith of Ladakh. Subsequent modifications on geology of the region were given by Misra (2009) whereby tectonic units based on stratigraphy and litho-contacts were established from cross-sections along a longitudinal profile.…”

Petrogenetic evolution of the felsic and mafic volcanic suite in the Siang window of Eastern Himalaya, Northeast India

“…1a). This antiform Syntaxis Bend is also defined by the folded litho-tectonic units into a major antiform across the Siang river (Singh, 1993;Kumar, 1997;Gururajan and Choudhuri, 2003), and the core of the Syntaxis has been named differently as Siang antiform (Singh, 1993) and Siang window (Acharyya, 1998). The crest of this Syntaxis is exposed further north in southern Tibet where the Indus Tsangpo Suture Zone and the Trans Himalaya plutonic belt wrap around NamcheBarwa peak area (Burg et al, 1997).…”