Ichnology of the Laisong Formation (late Eocene-early Oligocene) of the Naga Hills, Indo-Burma range (IBR): Paleoenvironmental significance

Lokho, Kapesa; Singh, Birendra; Whiso, Kezhakielie; Ezung, O. Chonchibeni

doi:10.1016/j.jseaes.2017.12.019

Cited by 10 publications

(3 citation statements)

References 75 publications

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“…Una hiperpicnita muestra recurrencia y pasajes transicionales, tanto verticales como laterales, de estructuras sedimentarias sin límites físicos definidos, rangos texturales variables, gradación inversa-normal, múltiples superficies de reactivación interna y en algunos casos abundante contenido de materia orgánica Mulder et al, 2003;Zavala et al, 2006;Ponce y Carmona, 2011a, b;Ponce et al, 2012;Canale et al, 2015). El estudio de las trazas fósiles asociadas a estos depósitos se ha incrementado de manera considerable en los últimos años (Gani et al, 2004;Ponce et al, 2007;Bhattacharya y MacEachern, 2009;Olivero et al, 2010;Carmona y Ponce, 2011;Dasgupta y Buatois, 2012;Canale et al, 2013Canale et al, , 2016Dasgupta et al, 2016;Lokho et al, 2017), permitiendo inferir las variaciones físico-químicas que generan estos sistemas en la columna de agua y en el sustrato, y cómo estas afectan la distribución temporo-espacial de los organismos.…”

Section: Introductionunclassified

Sedimentología e icnología de un delta fluvio-dominado, Formación Lajas (Jurásico Medio), cuenca Neuquina, Argentina

Canale

Ponce

Carmona

et al. 2020

andgeo

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Sedimentologic and ichnologic analysis of the Middle Jurassic Lajas Formation in Bajada de Los Molles area allow recognizing upper offshore-lower shoreface deposits in transition to prodelta, delta front and interdistributary bay succesions. This system is classified as a river-dominated delta due to the presence of distributary channel deposits with huge amounts of particulate organic matter and low diversity and abundance of trace fossils. Hyperpycnites are common in the basal and upper part of the studied section, and form channel-levee and distributary-channel systems, integrated by massive sandstones and load deformation structures, or transitional and recurrent passages of tractive sedimentary structures with abundant particulate organic matter on the foresets. The greatest diversity and abundance of trace fossils are recognized in the upper offshore-lower shoreface deposits where Skolithos and Cruziana ichnofacies occur. Deltaic deposits show trace fossil associations with lower diversity and abundance than the fully marine ones, whereas the hyperpycnite deposits are either unbioturbated or show the lowest diversity and abundance of trace fossils, reflecting the most stressed conditions within the system.

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Section: Introductionunclassified

Sedimentología e icnología de un delta fluvio-dominado, Formación Lajas (Jurásico Medio), cuenca Neuquina, Argentina

Canale

Ponce

Carmona

et al. 2020

andgeo

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“…Geological map of the study area after Lokho, Singh, Whiso and Chonchibeni Ezung (2018) with sample locations…”

Section: Geology Of the Study Areamentioning

confidence: 99%

Detrital zircon U–Pb ages of Tertiary sequences (Palaeocene‐Miocene): Inner Fold Belt and Belt of Schuppen, Indo‐Myanmar Ranges, India

et al. 2022

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The along‐strike heterogeneity in the tectonics of Himalaya is well recognized; however, the eastern segment of Himalaya is less studied compared to the other segments. This study combines the comprehensive field data, as well as the U–Pb geochronology of sandstone samples from the Indo‐Burma Range (east India). The study shows that the Lower Disang Formation was deposited in an open marine environment with a steep gradient during the Late Cretaceous to Mid‐Eocene, accommodating the detritus solely from an Indian source. Furthermore, during the Early to Late Eocene interval, the sedimentary basin changed to a shallow marine shelf when the sediments from Himalayan as well as trans‐Himalaya were deposited. The Upper Disang Formation must have been deposited just before or during the collision process between the Indian and Asian plates. After the India‐Asian collision, there was a remnant ocean, in which the sediments of the Barail and Surma groups were deposited in the shallow marine to deltaic environments. The Tethys Ocean completely dried out in the Late Miocene resulting in a change from marine to fluvial environments, which facilitated the deposition of the sandstones of the Tipam Formation. Based on the U–Pb ages, the Palaeogene basin history in the Indo‐Burma Range was unlike the central Himalaya, that is, the detritus were mainly sourced from the Burmese Plate and adjoining magmatic rocks.

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“…Hyperpycnal flows produce deposits of variable thicknesses, with recurrent and transitional passages, both vertically and laterally, of sedimentary structures without defined physical boundaries, variable textural ranges, inverse–normal gradation, multiple internal reactivation surfaces and, in some cases, abundant organic content (Zavala et al ., 2001, 2006; Mulder et al ., 2003; Ponce & Carmona, 2011a,b; Canale et al ., 2015, 2020; Zavala, 2020). The study of trace fossils in hyperpycnites from shallow and deep marine environments has increased during recent years, allowing us to understand the physicochemical variations generated by these processes in the water column and in the substrate, and therefore to infer how they affect the temporo‐spatial distribution of organisms (Gani et al ., 2004; Pattison, 2005a,b,c; Ponce et al ., 2007; Bhattacharya & MacEachern, 2009; Buatois et al ., 2011, 2019; Carmona & Ponce, 2011; Dasgupta & Buatois, 2012; Ayranci et al ., 2014; Canale et al ., 2016, 2020; Dasgupta et al ., 2016a,b; Lokho et al ., 2017; Arregui et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

Sedimentological and ichnological characterization of delta front mouth bars in a river‐dominated delta (Upper Cretaceous) from the La Anita Formation, Austral Basin, Argentina

Ponce,

Carmona,

Jait

et al. 2023

Sedimentology

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Integrated sedimentological and ichnological studies in deltaic systems are key to determine whether a delta is river‐dominated, tide‐dominated, wave‐dominated or hybrid, and thus predict the distribution of their geometries and main reservoirs. The Austral Basin is one of the most important oil and gas basins from Argentina, and the Upper Cretaceous La Anita Formation has shown excellent attributes as a hydrocarbon reservoir. Analysis of eleven cores, supplemented by a large volume of well logging data and two‐dimensional and three‐dimensional seismic, allowed to recognize a river‐dominated deltaic system affected by hyperpycnal discharges and storm events. Four main facies associations were recognized (offshore, prodelta, delta front and interdistributary bay), being the delta front facies associations, the most recurrent facies and constituting the major reservoir of the La Anita Formation. Three types of deltaic mouth bars have been characterized in the delta front. Type I corresponds to active mouth bars with preservation of sedimentary structures and bioturbated by suspension and deposit feeding organisms. Type II represents the stopped progradation and the abandonment in the construction of mouth bars, which are completely reworked by suspension and deposit feeding organisms and, in some cases, affected by fair‐weather or storm‐wave processes at the top. Type III comprises hyperpycnal mouth bars characterized by transitional and recurrent intervals of sedimentary structures, high concentration of phytodetritus, and paucity of bioturbation. The amalgamation and coalescence of these three types of sandy mouth bars produce lobe‐like geometries and are the main processes of delta front construction and progradation. This proposed model allows to explain the principal mechanism of construction of the delta front and can be applied to the analysis of other reservoirs where mouth bar architectural elements are dominant.

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Ichnology of the Laisong Formation (late Eocene-early Oligocene) of the Naga Hills, Indo-Burma range (IBR): Paleoenvironmental significance

Cited by 10 publications

References 75 publications

Sedimentología e icnología de un delta fluvio-dominado, Formación Lajas (Jurásico Medio), cuenca Neuquina, Argentina

Sedimentología e icnología de un delta fluvio-dominado, Formación Lajas (Jurásico Medio), cuenca Neuquina, Argentina

Detrital zircon U–Pb ages of Tertiary sequences (Palaeocene‐Miocene): Inner Fold Belt and Belt of Schuppen, Indo‐Myanmar Ranges, India

Sedimentological and ichnological characterization of delta front mouth bars in a river‐dominated delta (Upper Cretaceous) from the La Anita Formation, Austral Basin, Argentina

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