Geology of the western Arunachal Himalaya in parts of Tawang and west Kameng districts, Arunachal Pradesh

Bhattacharjee, Sumana; Nandy, Sandip

doi:10.1007/s12594-009-0043-7

Cited by 12 publications

(25 citation statements)

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“…Previous studies noted a penetrative tectonic foliation in the granites in the form of an augen gneiss foliation (Verma and Tandon, 1976;Bhattacharjee and Nandy, 2008). The localization of such penetrative ductile strain in the Bomdila gneiss is also inferred from the map pattern in Fig.…”

Section: Bomdila Gneiss and Bomdila Groupsupporting

confidence: 51%

“…1). This area has been geologically mapped by Das et al (1975), Thakur (1986), Singh and Chowdhary (1990), Acharyya (1987), Kumar (1997) and Bhattacharjee and Nandy (2008) and others. A plethora of stratigraphic names have been proposed by these workers, resulting in considerable confusion on the litho-tectonic framework of the WAH.…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…There is a progressive increase in the garnet size with structural height. The pelitic schist in the upper part of the Dirang Formation contains sporadic occurrence of kyanite and staurolite, along with garnet and micas (Bhattacharjee and Nandy, 2008). These low-medium grade schists are exposed in the adjoining Bhutan Himalaya as the Jaishidanda Formation (Daniel et al, 2003), immediately below the Greater Himalayan Sequence (GHS) (Fig.…”

Section: Dirang Formationmentioning

confidence: 99%

“…The higher grade Galensiniak Formation consists of schists and gneisses, intruded by tourmaline granite and pegmatite. In the Se La-Tawang-Bumla section, the rocks are a complex association of migmatite, garnetiferous Bt-Pl gneiss, calc-gneiss/ marble (diopside and scapolite-bearing), staurolite-bearing schist, tourmaline-bearing leucogranite, quartzite and pegmatite (Bhattacharjee and Nandy, 2008). These authors noted the presence of Ky + Bt + St-bearing assemblages in the lower part of the Se La Group at places like Lish and north of Changla, while sillimanitebearing assemblages with garnet and biotite are present in the migmatitic upper part.…”

Section: Se La Groupmentioning

confidence: 99%

“…In the WAH, previous workers have defined the Main Central Thrust (MCT) as a metamorphic discontinuity, which separates the low-medium grade Dirang Formation from the medium-high grade Se La Group (Kumar, 1997;Yin et al, 2006;Bhattacharjee and Nandy, 2008). As in the adjoining Bhutan Himalaya, the MCT, defined in this way, coincides with the first appearance of kyanite in the migmatites of pelitic bulk rock composition in the Se La Group (see later).…”

Section: Definition Of the Main Central Thrust In Wahmentioning

confidence: 99%

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Petrology of a non-classical Barrovian inverted metamorphic sequence from the western Arunachal Himalaya, India

Goswami

Bhowmik

Dasgupta

2009

Journal of Asian Earth Sciences

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Section: Bomdila Gneiss and Bomdila Groupsupporting

confidence: 51%

Section: Regional Geological Settingmentioning

confidence: 99%

Section: Dirang Formationmentioning

confidence: 99%

Section: Se La Groupmentioning

confidence: 99%

Section: Definition Of the Main Central Thrust In Wahmentioning

confidence: 99%

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Petrology of a non-classical Barrovian inverted metamorphic sequence from the western Arunachal Himalaya, India

Goswami

Bhowmik

Dasgupta

2009

Journal of Asian Earth Sciences

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Geochemical characterization, petrogenesis, and emplacement tectonics of Paleoproterozoic high‐Ti and low‐Ti mafic intrusive rocks from the western Arunachal Himalaya, northeastern India and their possible relation to the ~1.9 Ga LIP event of the Indian shield

Srivastava

Samal

2018

Geological Journal

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Paleoproterozoic mafic intrusive rocks from the western Arunachal Himalaya have been studied for understanding their petrogenesis and tectonic environment, in which they were emplaced, with the help of their bulk-rock major, trace, and rare-earth elements (REE) compositions. These mafic intrusive rocks, mostly small bodies of dykes, sills, and lenses, are exposed in the Higher as well as the Lesser Himalaya sequences. Geochemically, 2 suites of rocks are identified and grouped into high-titanium and low-titanium mafic intrusive rocks. High-titanium mafic intrusive (HTMI) samples have comparatively low Mg number (Mg#) and high high-field strength element contents in comparison to low-titanium mafic intrusive (LTMI) rocks. Multielements and REE patterns for these two identified groups are distinct. The LTMI and HTMI were originally spatially separated at the time of their emplacement and believed that probably they have been juxtaposed during the Himalayan orogeny by crustal shortening through development of imbricated thrusts. It is perceived that the HTMI and LTMI have different petrogenetic histories and are derived from two different melts; however, they are postulated to be parts of the same igneous province. Geochemical characteristics do not support any serious effect of crustal contamination; however, interaction with metasomatized lithospheric mantle cannot be discounted. Trace element petrogenetic modelling suggests derivation of the LTMI samples from a parental magma generated in spinel stability field (thin lithosphere) through a~20-25% melting of a lherzolite mantle source, whereas the HTMI samples were derived from~5-10% melting of a similar mantle source but from garnet stability field (thick lithosphere). Widespread Paleoproterozoic mafic events in the Indian shield such as Bastanar dyke swarm in the Bastar and the Hampi dyke swarm (also includes Pulivendla sills in the Cuddapah Basin) in the eastern Dharwar Craton together with mafic intrusive and extrusive rocks in the Himalayan region suggest presence of a large igneous province at~1.9 Ga.

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Brittle tectonics in the western Arunachal Himalayan frontal fold belt, northeast India: Change in stress regime from pre‐collisional extension to collisional compression

et al. 2022

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The study of brittle deformation of the collisional mountains can explain its shallow crustal tectonic evolution and the palaeostress regime. The Main Boundary Thrust (MBT) zone in the western Arunachal Himalaya displays imbrication in the Permian Gondwana sequence between the MBT‐1 (/Bome Thrust/MBT‐Upper) in the north and MBT‐2 (/MBT‐Lower) in the south with consistent northerly dip. The Lower Gondwana rocks occur in the footwall of the MBT‐1 with the Proterozoic Bomdila Group in the hangingwall. The upper Gondwana rocks constitute the hangingwall sequence for the MBT‐2 with Neogene Siwalik rocks in the footwall. This article analyses palaeostress using brittle fractures in the Gondwana rocks that crop out for ~120 km2 in the study area. The fault‐bounded imbricate zone depicts eight brittle shear indicators and four sets of joints (J1 and J2: inclined and J3 and J4: subvertical). The signatures of the inherited pre‐Himalayan extensional deformation are preserved in the Lower Gondwana Miri Formation. The Bichom and Bhareli rocks exhibit brittle deformation features of the Himalayan Orogeny under strong ~N‐S compression. The palaeostress analysis of all joint sets indicates three phases of brittle deformation in the Gondwana and Siwalik rocks of the area. The subvertical joint sets and normal faults in the Miri Formation indicate a north‐northwest (NNW)‐directed extensional phase of the pre‐Himalayan origin. The inclined joint sets of the Bichom and Bhareli formations of the Gondwana sequence depict Himalayan orogeny with ~N‐S compressional phases. The third phase of brittle deformation in the Siwalik sequence depicts an east‐west (~E‐W) extension. The arc‐parallel extension in the frontal fold belt of the Arunachal Himalaya may be due to oblique India‐Asia collisional tectonics.

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Geology of the western Arunachal Himalaya in parts of Tawang and west Kameng districts, Arunachal Pradesh

Cited by 12 publications

References 0 publications

Petrology of a non-classical Barrovian inverted metamorphic sequence from the western Arunachal Himalaya, India

Petrology of a non-classical Barrovian inverted metamorphic sequence from the western Arunachal Himalaya, India

Geochemical characterization, petrogenesis, and emplacement tectonics of Paleoproterozoic high‐Ti and low‐Ti mafic intrusive rocks from the western Arunachal Himalaya, northeastern India and their possible relation to the ~1.9 Ga LIP event of the Indian shield

Brittle tectonics in the western Arunachal Himalayan frontal fold belt, northeast India: Change in stress regime from pre‐collisional extension to collisional compression

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