Correlation of the tertiary geosynclinal sediments of the Surma Valley, Assam, and Tripura State (India)

Sinha, Rajiv; Sastri, V. V.

doi:10.1016/0037-0738(73)90002-x

Cited by 25 publications

(8 citation statements)

References 5 publications

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“…Many workers have studied heavy minerals in the Siwalik Group (Gill, 1951;Sinha, 1970;Chaudhri, 1972) and its equivalents in Assam (Sinha and Sastri, 1973). These workers identified a number of marker minerals for their subgroups: staurolite, kyanite, sillimanite, and andalusite.…”

Section: Comparisons With Tertiary Sediments In Thementioning

confidence: 99%

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Mineralogy of Silts from the Bengal Fan

Yokoyama¹,

Amano²,

Taira³

et al. 1990

Proceedings of the Ocean Drilling Program

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Early Miocene to Quaternary sediments drilled from the Bengal Fan are divided into six zones by modal proportions of heavy minerals. The sediments were mostly derived from the Himalayas. Detritus from the Indian subcontinent is found sporadically in clay-rich sediments that were deposited during periods of slow sedimentation, when the deep-sea channel migrated away from the drilled sites.The oldest sediments, ranging from 17 to about 15 Ma, were derived mostly from the Precambrian and Paleozoic sedimentary rocks of the lower Himalayas. At about 15 Ma, metamorphic terrains were eroded in the source area. Further large-scale unroofing of metamorphic rocks occurred around 11 Ma. After 10 Ma, the major constituents in the drainage basin or the drainage pattern changed a few times. Between 3.5 and 0.5 Ma, a large peridotite body was unroofed by uplift and successive erosion of the central Himalayas. At this time, the single large river that had supplied detritus to the early Bengal Fan was divided into the Indus and Ganges rivers.

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Section: Comparisons With Tertiary Sediments In Thementioning

confidence: 99%

“…The change of flow direction of the Brahmaputra River may be explained by the uplift of the Central Himalayas (Sinha, 1970) and Assam (Sinha and Sastri, 1973). The ages in Punjab are from Johnson et al (1985).…”

Section: Comparisons With Tertiary Sediments In Thementioning

confidence: 99%

Mineralogy of Silts from the Bengal Fan

Yokoyama¹,

Amano²,

Taira³

et al. 1990

Proceedings of the Ocean Drilling Program

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“…• Stating that geology of Tripura received 'passing reference in the scientific literature' at the outset of their article (p. 354), Dey et al had chosen not to refer to any of the well-known works on structural geology of the CTFB that include Sinha and Sastri (1973); Nandi (1977); Ganguly (1983Ganguly ( , 1993; Nandy (1980Nandy ( , 1981Nandy ( , 2001; Nandy et al (1983); Ray and Asthana (1989) and Alam (1999, 2003) among others. • The structure of the Tripura fold belt is not a 'synclinorium' like Dey et al described (p. 357), but represents a series of discontinuous and plunging anticlines and synclines as mentioned earlier.…”

Section: Issues Related To Results and Discussionmentioning

confidence: 98%

Morphological signatures of fault lines in an earthquake prone zone of southern Baromura hill, north-east India: a multi source approach for spatial data analysis. A critical review

Bandyopadhyay

2010

Environ Earth Sci

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In a recent work, Dey et al. (Environ Earth Sci 59:353-361, 2009) presented some new observations on the southern part of one of the anticlinal ridges of Tripura, viz. the Baromura range. The work incorporated a number of irregularities and misinterpretations that need to be addressed to avoid future confusion. The present article critically reviews Dey et al.'s paper to bring out its inaccuracies.

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“…3B, 4A, and 4B) are Sinha andSastri, 1973 andRangarao, 1983. quartzolithic and contain subangular to angular grains of monocrystalline and polycrystalline quartz, mostly plagioclase feldspar, and sedimentary and metamorphic lithic fragments. Lithic fragments in this unit are more diverse compared to the Eocene Disang Group sandstones.…”

Section: Naogaon Formationmentioning

confidence: 98%

“…The stratigraphic framework of Assam is based mainly on biostratigraphy, predominantly using palynology, with correlations depending on lithostratigraphy (Evans, 1964;Sinha and Sastri, 1973;Rangarao, 1983). The basin sequences have also been correlated by seismic stratigraphy by various industry groups, including the Oil and Natural Gas Commission of India (Saikia, 1999).…”

Section: Assam Paleogene Sequencesmentioning

confidence: 99%

Early Orogenic History of the Eastern Himalayas: Compositional Studies of Paleogene Sandstones from Assam, Northeast India

Uddin

Kumar

Sarma

2007

International Geology Review

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Thick Eocene-Oligocene sequences, exposed near the Margherita-Changlang area, northeast Assam represent detritus derived from the early Himalayan and Indo-Burman orogenic belts, extending the 18-0 Ma record recovered from drilling the distal Bengal Fan. Sandstones from the Eocene Disang Group (Qt 68 F 3 L 29; total quartz-feldspar-lithic fragments) and the lower Oligocene Naogaon Formation (Qt 69 F 6 L 25 ) are compositionally and texturally immature, composed mainly of quartz, sedimentary and low-grade-metamorphic lithic fragments (including abundant chert), and plagioclase. Sandstones of the overlying middle and upper Oligocene Baragolai (Qt 66 F 12 L 22 ) and Tikak Parbat (Qt 82 F 4 L 14 ) formations are similar but also contain significant amounts of volcanic and higher grade metamorphic detritus. These sandstones are clearly derived from an orogenic source, exposing and eroding sedimentary and low-grade metamorphic units to form the older sandstones, followed by increasing contributions from volcanic and higher grade metamorphic rocks during deposition of the middle and upper Oligocene sandstones. In contrast, Eo-Oligocene strata (Eocene: Qt 99 F 1 L 0 ; Oligocene: Qt 90 F 3 L 7 ) from the neighboring Bengal Basin contain angular quartzose sands that represent first-cycle detritus, most likely from the Indian craton. The Bengal Basin was protected from orogenic sedimentation during the Eocene-Oligocene, either by a barrier to sediment transport (a peripheral forebulge or a marine basin) or by distance, prior to the approach of the basin toward Asia. Motion of this part of the Indian plate relative to now-adjacent Southeast Asia was most likely accomplished along strike-slip faults, like the N-S-trending Kaladan fault, located just east of the Bengal Basin. Similarity in modal composition (quartzolithic to phyllarenitic) of Paleogene sequences of Assam and basins south of the Himalayan western syntaxis suggests that the Himalayan emergence was not strongly diachronous, with initial collision and uplift at both syntaxial areas occurred in the Eocene.

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Correlation of the tertiary geosynclinal sediments of the Surma Valley, Assam, and Tripura State (India)

Cited by 25 publications

References 5 publications

Mineralogy of Silts from the Bengal Fan

Mineralogy of Silts from the Bengal Fan

Morphological signatures of fault lines in an earthquake prone zone of southern Baromura hill, north-east India: a multi source approach for spatial data analysis. A critical review

Early Orogenic History of the Eastern Himalayas: Compositional Studies of Paleogene Sandstones from Assam, Northeast India

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