Indian Gondwana palynochronology: relationships and chronocalibration

Tiwari, R.S.; Kumar, Rajiv

doi:10.54991/jop.2002.1730

Cited by 3 publications

(2 citation statements)

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“…. The palynofloral assemblages of Killari borehole can be correlated easily with other contemporaneous deposits of India and Gondwanic basins Tiwari and Kumar (2002). andJha and Agrawal (2015) recorded Parasaccites korbaensis and Plicatipollenites indicus from early Permian sediments of Raniganj Basin and Talchir Formation of the Godavari Graben of South India, respectively.…”

mentioning

confidence: 76%

“…The palynofloral assemblages of Killari borehole can be correlated easily with other contemporaneous deposits of India and Gondwanic basins. Tiwari and Kumar (2002) and Jha and Agrawal (2015) recorded Parasaccites korbaensis and Plicatipollenites indicus from early Permian sediments of Raniganj Basin and Talchir Formation of the Godavari Graben of South India, respectively. Jha and Mishra (2017) recorded Plicatipollenites indicus , Parasaccites korbaensis , P. diffuses , Jayantisporites pseudozonatus from Chintalapudi area, Godavari Graben, South India.…”

Section: Palynological Studiesmentioning

confidence: 99%

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Presence of infratrappean Gondwana sediments below Deccan volcanic covered 1993 Killari earthquake region, Maharashtra (India) and geodynamical instability of the south Indian craton

et al. 2023

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KLR‐1 scientific deep borehole, drilled in the 1993 Killari earthquake region of Maharashtra (India), penetrated 8 m thick infratrappean sediments below a 338 m‐thick column of Deccan volcanics that rested over Neoarchean amphibolite to granulite facies mid‐crustal basement. Detailed palynological studies revealed the presence of characteristic Gondwana palynomorphs in sedimentary succession that include Plicatipollenites indicus, P. trigonalis, Parasaccites korbaensis, P. diffusus, Microbaculispora indica, Cyclobaculisporites minimus, Cyclogranisporites barakarensis, C. gondwanensis, Jayantisporites pseudozonatus, Leiosphaeridia bokaroensis, Latosporites sp., Verrucosisporites sp., cf. V. ambiplicatus and Striatopodocarpites gondwanensis. Qualitative analyses of palynomorphs would suggest an Asselian age (298–295 Ma) for their formation and burial in dysoxic to anoxic conditions. Recorded palynological assemblages correlate well with continental Lower Gondwana (Early Permian) sediments of India, as well as other Gondwana continents, indicating a larger extent of Gondwana sedimentation than hitherto known today. Petrological studies indicate the presence of two types of carbonate units that overly the crystalline basement. A relatively coarse‐grained sparry carbonate rock immediately overlies the basement (Sample KIL‐7). The size of the carbonate crystals in the sparite vary from 100 to 500 μm. This unit is overlain by an extremely fine‐grained micrite resembling lime mud (Sample KIL‐6). Micrite is made of carbonate grains with an average size of 10 μm. X‐ray diffraction studies indicate that calcite is the dominant carbonate mineral, while dolomite and quartz occur in minor amounts. Geochemical analyses indicate that in these two samples of carbonate rock that overlie the basement, CaO (33.38 to 38.16 wt %) is higher than MgO (16.0–23.85 wt%). These infratrappeans sediments are also characterized by stable carbon (δ13C) and oxygen (δ18O) isotopic ratios ranging from −1.59 to −8.74‰ and −9.12 to −13.50‰ versus PDB, respectively, thereby conforming to non‐marine fresh water deposits. These findings provide first evidences of reactivation and rifting of Dharwar intracratonic regions during earliest Permian Gondwana Period, which led to severe lithospheric mantle destruction, and massive regional uplift and erosion of the granitic‐gneissic upper crust. Large scale inland‐rifting during the Gondwana sedimentation period was possibly a prelude to India‐Antarctic breakup during the early Cretaceous.

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confidence: 76%

Section: Palynological Studiesmentioning

confidence: 99%

Presence of infratrappean Gondwana sediments below Deccan volcanic covered 1993 Killari earthquake region, Maharashtra (India) and geodynamical instability of the south Indian craton

et al. 2023

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First Report of Fungal Palynomorphs From the Zechstein Group (Lopingian): Implications for the Stratigraphic Completeness of the Earth's Paleozoic Fungal Record

Gibson

2022

Palaios

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Palynological study of the Permian–Triassic boundary has typically focused on the pollen grain and spore content to reconstruct vegetation, with fungal remains either left unidentified or set aside for future research. Paleozoic fungal microfossil records in particular are lacking. The Zechstein Group (∼ 258–252 Ma; Lopingian) is a remarkable stratigraphic sequence of stacked carbonates and evaporites. High-resolution palynological analysis of new borehole cores through the Zechstein Group of northeast England has revealed its entire sedimentological history and enabled a new reconstruction of vegetation dynamics in central-western Europe preceding the Permian–Triassic boundary. Assemblages composed of conifers, pteridosperms, pteridophytes, sphenopsids, and cycads/ginkgoes were recovered alongside fungal remains throughout the entire sequence. Four fungal morphologies were observed, the most common being smooth-walled spheroidal inclusions of an endobiotic Chytridiomycota or Hypochytridiomycota affinity. Other evidence of fungi includes epiphytic Callimothallus-type fungi (Family Microthyraceae), the dematiaceous Chaetomium-like mold (Family Chaetomiaceae) found associated with soil, cellulose and plant debris, and possible evidence of chytrid-induced pitting on the surface of plant cuticle. This is the first study to highlight the fungal content of Zechstein palynological preparations and while occurrences are rare, they provide new insight into the composition of the Zechstein forest understory, reinforcing the interpretation that the upper Zechstein environment was humid. This work improves our understanding of the taxonomic and functional diversity of fungal taxa associated with evaporite systems during the Lopingian, and highlights the exceptional preservation potential of halite, combating underestimates of fungal richness in the fossil record.

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Evidence of an early Permian palynomorphs in Ophiolitic Mélange of the Shyok Suture Zone, Eastern Karakoram, Ladakh, India

Gautam¹,

Awatar²,

Sharma³

2023

JPS

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An Early Permian palynomorphs have been recorded for the first time from Ophiolitic Mélange of the Shyok Suture Zone, Eastern Karakoram, Ladakh, India. The characteristic taxa recorded in the assemblage are–Caheniasaccites diffusus, Crescentipollenites korbaensis, Distriatites bilateris, Faunipollenites varius, Ibisporites diplosaccus, Lacinitriletes badamensis, Lahirites parvus, Lunatisporites sp., Parasaccites korbaensis, Platysaccus brevizonatus, Plicatipollenites trigonalis, Potonieisporites mutabilis, Primuspollenites levis, Rhizomaspora indica, Scheuringipollenites tentulus, Striatites subtilis, Striasulcites ovatus, Striatopodocarpites gondwanensis and Verticipollenites secretus. The palynoflora recorded here reveals a typical early Permian age (Asselian–Sakmarian; 299.0–284.0 Ma) and affiliated to those described from the peninsular and extra–peninsular region of Lower Gondwana sediments of India as well as other core Gondwana continents. The study suggests that these palynomorphs were trapped remnants of the active continental margin of the Peri–Gondwanic Microcontinent/Kshiroda Plate that was cut off during subduction/integration processes between the Shyok–Suture–Zone of Ladakh and Karakoram Qiangtang Lhasa terrane and preserved in the Ophiolitic Mélange.

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Indian Gondwana palynochronology: relationships and chronocalibration

Cited by 3 publications

References 10 publications

Presence of infratrappean Gondwana sediments below Deccan volcanic covered 1993 Killari earthquake region, Maharashtra (India) and geodynamical instability of the south Indian craton

Presence of infratrappean Gondwana sediments below Deccan volcanic covered 1993 Killari earthquake region, Maharashtra (India) and geodynamical instability of the south Indian craton

First Report of Fungal Palynomorphs From the Zechstein Group (Lopingian): Implications for the Stratigraphic Completeness of the Earth's Paleozoic Fungal Record

Evidence of an early Permian palynomorphs in Ophiolitic Mélange of the Shyok Suture Zone, Eastern Karakoram, Ladakh, India

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