Geodynamic Model for Midcontinent Resurgent Activity and Instability of India Shield

Naik, G.C.; Srivastayva, A.K.; Mishra, Vishwatosh

doi:10.1201/9781003079583-13

Cited by 1 publication

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sen (1991) explained that the Son‐Narmada (SONA) Lineament of Central Indian Tectonic Zone (CITZ) could be extended up to the Mishimi tectonic zone through the northern flank of Brahmaputra Valley which was most active in the Cretaceous period and caused about 600 km relative dextral‐slip displacement. Naik, Srivastayva, and Mishra (1997) extended the SONA lineament up to the Jorhat Fault. Therefore, it can be inferred that Precambrian shears in eastern India might have played a significant role in the separation of Shillong Plateau from the CGGC and is a gap of understanding.…”

Section: Discussionmentioning

confidence: 99%

“…However, the present continental shelf/slope is far away from this EHZ, locating in the Indian Ocean. The Bengal Basin is largely considered as a remnant ocean basin (Alam et al, 2003; Gani & Alam, 1999, 2003; Ingersoll, Graham, & Dickinson, 1995; Mitchell & Reading, 1986; Naik et al, 1997) wherein, it was essentially a south‐east facing passive margin prior to Tertiary collision (Johnson & Alam, 1991) and the orogenic signature could be depicted through Miocene sedimentation (Uddin & Lundberg, 1998, 2004). Hence, it can be said that since Eocene time, the EHZ progressively shifted towards the south and south‐east due to rapid sedimentation during Miocene uplift of the Himalayas and Indo‐Burma ranges.…”

Section: Discussionmentioning

confidence: 99%

“…Chatterjee et al (2007) inferred the existence of a Pan-African suture caused by amalgamation of the Indian Plate with Antarctica and Australia Sen (1991). explained that the Son-Narmada (SONA) Lineament of Central Indian Tectonic Zone (CITZ) could be extended up to the Mishimi tectonic zone through the northern flank of Brahmaputra Valley which was most active in the Cretaceous period and caused about 600 km relative dextral-slip displacement Naik, Srivastayva, and Mishra (1997). extended the SONA lineament up to the Jorhat Fault.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Tectono‐stratigraphic evolution of Shillong Plateau, North East India through thePermian‐Eocenewindow

Ali

Duarah

2022

Geological Journal

View full text Add to dashboard Cite

The Shillong Plateau in the north‐eastern Indian Plate signifies a cut‐off patch of the Indian Peninsular Shield, bordered by fault and thrust sheets, with thick alluvium cover along its periphery. The basement rock in the plateau accomplished about 2 km relief difference with the adjoining Sylhet Trough of Bangladesh in the south. The plateau witnessed Permo‐Carboniferous Gondwana sedimentation at its western margin, with Early Cretaceous basaltic traps and continuous fluvio‐marine sedimentation along its southern edge since the late Cretaceous. Although it is largely believed that strike‐slip movement along the Dauki Fault shifted the plateau about 250 km eastward, however, the driving mechanism for Shillong Plateau detachment and conversion of rift‐intercratonic basin to platformal configuration has drawn more attraction. This article focuses on the tectono‐stratigraphic evolution of Shillong Plateau and its adjoining regions on the basis of previous works, to try to understand the distinct tectonic and environmental factors. Early Permian continental rifting to the south‐west of the plateau and south‐east and south‐west of the Malda High presumably separated the Shillong Plateau from Chotanagpur Granite Gneiss Complex (CGGC). Extrusion of Rajmahal Traps west of the Malda High and Bengal‐Sylhet‐Mikir volcanism along an Early Cretaceous geofracture probably accelerated the east‐northeast migration of Shillong Plateau with respect to the CGGC. Since the Late Cretaceous, sedimentation at the southern fringe of Shillong Plateau commenced with an intracratonic basin which gradually transformed into a passive margin configuration during the Late Palaeocene‐Eocene Epoch during growth of the Indian Ocean. Differential subsidence in southern Shillong Plateau caused clastic sedimentation without considerable transportation. At the beginning, the Late Cretaceous intracratonic basin had received volcanoclastic, fluvio‐lacustrine sediments in a series of graben/half‐grabens associated with extensional faulting and volcanism, as represented by the Lower Mahadek and Jadukata formations in the plateau. The upper Mahadek and later Palaeogene sequences along the southern margin of the plateau record marine sedimentation, initiated with an estuarine‐marshy environment during the Late Cretaceous to Palaeocene, followed by a platformal marine succession since the Mid‐Eocene. The Calcutta‐Mymensingh Eocene Hinge Zone that separates a stable shelf from the deep basinal part might be traced through the south‐eastern fringe of Shillong Plateau and presumably continues further north‐east between the Naga and Disang thrusts in the eastern part of Dhansiri Valley.

show abstract

Section: Discussionmentioning

confidence: 99%