Petrographic characteristics of coal from Mailaram coalfield, Godavari valley, Andhra Pradesh

Sarate, Omprakash S.

doi:10.1007/s12594-010-0116-7

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The extensive stratigraphic gap of several tens of millions of years between the Carboniferous/Permian [see Cox (1953) for a discussion of the Permian taxa recorded by Ludwig (1861)] and the Late Triassic strata casts doubt on the attributions of the Palaeozoic species or, alternatively, reflects the extremely poor early Mesozoic freshwater fossil record. Additional species attributed to Lymnaeidae, Physidae, Pomatiopsidae, and Thiaridae in open nomenclature have been reported from Upper Triassic deposits of India (Nath, 1999). Yet, the taxonomy is highly doubtful again; for the purpose of this revision, these latter species are not considered herein as true first occurrences.…”

Section: A Global Review Of the Fossil Recordmentioning

confidence: 99%

The fossil record of freshwater Gastropoda – a global review

Neubauer

2023

Biological Reviews

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Gastropoda are an exceptionally successful group with a rich and diverse fossil record. They have conquered land and freshwater habitats multiple times independently and have dispersed across the entire globe. Since they are important constituents of fossil assemblages, they are often used for palaeoecological reconstruction, biostratigraphic correlations, and as model groups to study morphological and taxonomic evolution. While marine faunas and their evolution have been a common subject of study, the freshwater component of the fossil record has attracted much less attention, and a global overview is lacking. Here, I review the fossil record of freshwater gastropods on a global scale, ranging from their origins in the late Palaeozoic to the Pleistocene. As compiled here, the global fossil record of freshwater Gastropoda includes 5182 species in 490 genera, 44 families, and 12 superfamilies over a total of ~340 million years. Following a slow and poorly known start in the late Palaeozoic, diversity slowly increased during the Mesozoic. Diversity culminated in an all‐time high in the Neogene, relating to diversification in numerous long‐lived (ancient) lakes in Europe. I summarise well‐documented and hypothesised freshwater colonisation events and compare the patterns found in freshwater gastropods to those in land snails. Furthermore, I discuss potential preservation and sampling biases, as well as the main drivers underlying species diversification in fresh water on a larger scale. In that context, I particularly highlight the importance of long‐lived lakes as islands and archives of evolution and expand a well‐known concept in ecology and evolution to a broader spectrum: scale‐independent ecological opportunity.

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Section: A Global Review Of the Fossil Recordmentioning

confidence: 99%

The fossil record of freshwater Gastropoda – a global review

Neubauer

2023

Biological Reviews

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“…2). Fusinite and semi-fusinites are considered to be the product of peat fire (Sarate, 2013). Some mega sporinites are also recorded in some samples along with thick and thin-walled sporinites, appearing like elongated thread or spindle-shaped.…”

Section: Petrographic Compositionmentioning

confidence: 99%

“…The Talchir, Barakar, and Kamthi Formations make up the majority of the geologic sequence in the Chintalapudi Sub-basin. The Talchir sequence form the base of the Gondwana succession with a thickness of 200 to 370 metres, which also includes a shale sequence, fine-grained greenish sandstone, and a basal boulder bed (Lakshminarayana and Murti, 1990;Sarate, 2013Sarate, , 2017Sarate, , 2018. The generalised geological map of the area of the Chintalapudi Sub-basin along with the sample (borehole) locations is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Rock-Eval Pyrolysis and Petrographic Characteristics of Coals of Chintalapudi Sub-Basin, Pranhita-Godavari Basin, Southern India: Implication to Depositional Environment

Kiran¹,

Gogoi²

2023

JGSR

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The results of the Rock-Eval pyrolysis and petrological investigation carried out on coal samples from the Chintalapudi sub-basin of the Pranhita- Godavari basin have been discussed to identify the assessment of the maturity, type, and quantity of organic matter and interpret the depositional environment. Petrographically these coals are enriched in vitrinite (40.0%-60.7%) followed by liptinite (7.3%-26.0%) and inertinite (9.3%-24.0%) macerals.TOC concentrations range from 17.54% to 64.97%. S1 ranges from 0.30% to 1.63% and S2 ranges from 11.70% to 138.06% are considered to be good source rocks. The Tmax values of the Chintalapudi sub-basin coals are found to be between 420°C to 428°C, indicating an immature source rock for the production of oil. The coal samples have an average HI of 157 mg HC/g TOC and VRo of 0.30% placing them in the Type III gas kerogen range. HI, and OI values reveal that the samples of organic matter composition mostly follow the evolutionary route of mixed Type II/III kerogens and are contributed by terrestrial plants which is the main source of the organic matter. The GI (1.67-5.95) and TPI (2.75-47.14)values favour the existence of wet moor with moderate to severe floods with short periods of alternateoxic and anoxic moor environments due to the high concentration of vitrinite that allowed for adequate tissue preservation. Keywords: Kerogen, Rock-Eval Pyrolysis, Petrography, Chintalapudi Sub-basin

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Sub-surface Coal Seams of Bhupalpalli and Golapalli Areas of Godavari Valley Coalfield and their Petrographic Characteristics

Sarate¹

2016

Journal of the Geological Society of India

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The research work details the maceral organization of eleven coal seams intersected at a maximum depth of 446.45 m from Bhupalpalli area of the Mulug coal belt, in Warangal district of Godavari valley. Samples for petrographic study have been collected from ten coal seams intersected between 106 m and 299 m depth range from Bore-hole No. 618 which includes, IA and its underlying I, II, Index below II, IIIB, IIIA, III, IVA, IV and Index below IV respectively. However, the coal samples from the bottom most V seam were collected from Bore-hole No. 616 encountered between 445.65 m and 446.45 m. The study has revealed that V seam is marked by vitric type and seam IVA contains coal of fusic nature. The seams I, II, Index below II, IIIB, IIIA and IV, however, are represented by mixed type of coal. Whereas, the seams IA and III have the prevalence of vitric as well as mixed coal types. IA seam has witnessed alternate oxic and anoxic moor condition and also wet moor with intermittent moderate to high flooding. All the other seams have been deposited during alternate oxic and anoxic moor conditions. The coal seams of the study area have shown a wide range of variation in vitrinite reflectance (Ro mean %). The top of III, basal part of IV and the entire Index below IV have recorded high vitrinite reflectance (Ro mean %), which ranges between 0.66-0.67% thus they have reached high volatile bituminous B stage, all the other seams show lower reflectance and therefore have attained high volatile bituminous C rank.

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Petrographic characteristics of coal from Mailaram coalfield, Godavari valley, Andhra Pradesh

Cited by 5 publications

References 6 publications

The fossil record of freshwater Gastropoda – a global review

The fossil record of freshwater Gastropoda – a global review

Rock-Eval Pyrolysis and Petrographic Characteristics of Coals of Chintalapudi Sub-Basin, Pranhita-Godavari Basin, Southern India: Implication to Depositional Environment

Sub-surface Coal Seams of Bhupalpalli and Golapalli Areas of Godavari Valley Coalfield and their Petrographic Characteristics

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