Himalayan Paleogene Foreland Basin, its collision induced early volcanic history and failed rift initiation

Acharyya, S. K.; Saha, Puspendu

doi:10.1016/j.jseaes.2018.04.031

Cited by 10 publications

(7 citation statements)

References 27 publications

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“…In the Cretaceous, due to the effect of shift and rotation of the Indian plate, the tectonic stress was mainly stretched and tensional in east-westward direction with dextral strike-slip shear characteristics and the transtensional faults were well developed, trending from northwest to southeast (Figure 3). In all, the Cretaceous fault system in the S Block is well developed, and the fault contact relationship is complex (Robson et al 2018;Feng et al 2018;Nabavi et al 2019;Acharyyaa and Saha 2018;Shabeer et al 2018;Teng et al 2017). From the latest seismic interpretation result and based on a series of fault factors, such as fault strike, fault throw, fault extension length and its cutting relation to stratum, the fault system is divided into three types: Type I (main faults), Type II (secondary faults) and Type III (interlayer small faults) (Table 1).…”

Section: Fault Classification and Characteristicsmentioning

confidence: 99%

Structural characteristics of transtensional fault system and its implication for hydrocarbon accumulation in S Block, South Asia area

DONG,

SATTI,

HERMANA

et al. 2021

Turkish J Earth Sci

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Transtensional faults are well developed in the S Block of the South Asia area, which have an important impact on the hydrocarbon accumulation. However, the transtensional fault structure is very complex. Based on drilling and seismic data interpretation results, faults are divided into three typical types in the Lower Cretaceous, which can help to understand the complex fault system. The main faults are distributed in the NNW-SSE direction and parallel arrangement with dextral strikeslip shear characteristics, which determines the development of the tectonic belt. The secondary faults are often associated with the main faults, often composed of multiple branch faults. The complexity of the fault system is further aggravated by the small interlayer faults. Based on balanced cross-section technique analysis, the fault evolution has experienced five geological periods, which is closely related to the Indo-Pakistan plate tectonics and the Indus Basin evolution. In the diagonal extension stage of the Late Cretaceous, the fault activity was very strong, which had a significant impact on the tectonic pattern of "horst-graben structures and locally complex faulted blocks" in S Block. It is found that transtensional fault assemblage patterns are regular and diverse. It consists of six kinds of plane assemblage and seven kinds of profile assemblage patterns. Plane assemblage patterns include en-echelon, broom, feather, comb, horsetail and diamond shape, while profile assemblage patterns consist of horst-graben faulted type, consequent faulted type, antithetic faulted type, "Y" and reverse "Y" type, "X" type and negative flower type. Different transtensional fault assemblage patterns form various kinds of hydrocarbon trap types, including faulted block, faulted nose, faulted anticline and composite traps. Fault activity and evolution promote the hydrocarbon generation, control the formation of tectonic zones and favorable traps and play an important control role in hydrocarbon migration and accumulation. Therefore, in this study the main exploration and evaluation targets are faulted reservoirs in the study area.

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Section: Fault Classification and Characteristicsmentioning

confidence: 99%

Structural characteristics of transtensional fault system and its implication for hydrocarbon accumulation in S Block, South Asia area

DONG,

SATTI,

HERMANA

et al. 2021

Turkish J Earth Sci

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“…Image shows the Himalayan Foreland basin with a marked inset for the Kangra and Subathu basins. ITS , Indus Tsangpo Suture; MCT , Main Central Thrust; MBT , Main Boundary Thrust; MFT , Main Frontal Thrust (after Acharyya, ; Acharyya & Saha, ). (C) Geological map of the Kangra Basin (after Raiverman et al ., ).…”

Section: Geological Settingmentioning

confidence: 99%

Role of latitudinal shift and climate change in evolution of red and yellow palaeosols of the Himalayas: Implications for early Oligocene seasonality and Mid‐Miocene enhanced precipitation

Upreti

Srivastava

2020

Sedimentology

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Cenozoic atmospheric circulation, climatic changes, sedimentation and weathering over the Indian sub-continent were mainly influenced by the northward drift of the Indian Plate, the shrinking Paratethys, India-Asia collision and the rise of the Himalayas. This study is aimed at exploring the fluvial sedimentary record of the north-west part of the Himalayan Foreland Basin to interpret weathering and pedogenesis during early Oligocene to Mid-Miocene time. Palaeopedological investigation of a 3.1 km thick succession from Kangra sub-basin of the Himalayan Foreland Basin shows that the lower 2 km part of the succession is characterized by the red (10R hue) and the upper 1.1 km part of the succession by the yellow (2.5Y hue) palaeosols with varying intensity of weathering and pedogenesis. The association of sedimentary rocks and pedogenic expression in palaeosols indicate four (Type-A to Type-D) pedofacies in the entire Oligocene-Miocene succession. The pedofacies are defined by a decrease in the intensity of palaeopedogenic development from strongly-developed palaeopedofeatures in Type-A, moderately-developed palaeopedofeatures in Type-B, weakly-developed palaeopedofeatures in Type-C and to the only incipient stage of palaeopedogenesis in Type-D pedofacies. The palaeolatitudinal shift during the convergence of the Indian Plate played a major role in weathering and palaeopedogenesis with the inception of seasonality during the early Oligocene, which is demonstrated by the formation of the red palaeosols with pedogenic CaCO 3 and vertic features in tropical conditions. The transition to yellow palaeosols at about 20 Ma is marked by increased humidity, rapid aggradation, pronounced uplift and enhanced erosion of the hinterland. These yellow palaeosols are characterized by the abundance of weakly-developed Bw and Bss horizons, pure clay pedofeatures and absence of any pedogenic CaCO 3 during short pedogenic intervals in subtropical conditions.

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“…The E-W elongated IGP shaped in response to the collision of the Indian plate, and Eurasian Plate that caused the uplift of Himalaya initiated in the Palaeogene is an active foreland basin (DEWEY JF and BIRD JM, 1970), (Singh, 2013)(Acharyya and Saha, 2018). The region integrates numerous covered faults and ridges in its basement (Valdiya, 1970) (Acharyya and Saha, 2018). In the IGP, groups of significant ridges added due to seismotectonic movements of the basements.…”

Section: Seismotectonic Setupmentioning

confidence: 99%

Deterministic Investigation of Effect of Stress Drop on Seismic Site Response Analysis of Allahabad City

Sharma

Pallav

Duggal

2020

Preprint

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Due to the high stress of Faizabad ridge close to Allahabad city and the absence of strong-motion records for any engineering studies, it is essential to use a stochastic model to study the deterministic earthquake scenario of Allahabad city. The work investigates the effect of stress drop for an earthquake on 30 sites (83 boreholes) located across the city using 1-D seismic site response analysis. The ground motion has been simulated for Allahabad fault using stochastic finite fault model for stress drop ranges from ~70 bar to ~200 bars. Simulation results show the Peak Ground Acceleration (PGA) value of 0.026 g and 0.085 g at 70 and 200 bars stress drops, respectively. Site response results reveal that Indian Standard IS: 1893-2002 underestimates the PGA at higher stress drop compared to the estimated spectral acceleration values. Further, the lower stress drop can give a higher mean spectral acceleration at a long-period. Contour plot of surface-level PGA, low and high period spectral acceleration with response spectra for Allahabad city shows the variation with stress drop.

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Himalayan Paleogene Foreland Basin, its collision induced early volcanic history and failed rift initiation

Cited by 10 publications

References 27 publications

Structural characteristics of transtensional fault system and its implication for hydrocarbon accumulation in S Block, South Asia area

Structural characteristics of transtensional fault system and its implication for hydrocarbon accumulation in S Block, South Asia area

Role of latitudinal shift and climate change in evolution of red and yellow palaeosols of the Himalayas: Implications for early Oligocene seasonality and Mid‐Miocene enhanced precipitation

Deterministic Investigation of Effect of Stress Drop on Seismic Site Response Analysis of Allahabad City

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