Journal of Palaeosciences最新文献

Demonstration of process-based reconstruction of annual temperatures from tree ring oxygen isotope 从树环氧同位素重建基于过程的年气温演示

Journal of Palaeosciences Pub Date : 2023-12-22 DOI: 10.54991/jop.2023.1849

T. Bose, Supriyo Chakraborty

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Palyno–morphological and isotopic characterization of monofloral and multifloral honeys from Lucknow, India 印度勒克瑙单花和多花蜂蜜的古生物形态学和同位素特征

Journal of Palaeosciences Pub Date : 2023-12-22 DOI: 10.54991/jop.2023.1858

S. Farooqui, Md. Firoze Quamar, A. Farooqui, Rajesh Agnihotri, Salman Khan

{"title":"Palyno–morphological and isotopic characterization of monofloral and multifloral honeys from Lucknow, India","authors":"S. Farooqui, Md. Firoze Quamar, A. Farooqui, Rajesh Agnihotri, Salman Khan","doi":"10.54991/jop.2023.1858","DOIUrl":"https://doi.org/10.54991/jop.2023.1858","url":null,"abstract":"We describe and illustrate the detailed palyno–morphological attributes, based on light microscopy (LM) and field emission scanning electron microscopy (FESEM), as well as characterize the carbon stable isotopic (δ13C) values of filtered and unfiltered natural and commercial honey samples from Lucknow, India. The principal objective behind conducting the melissopalynological investigation is to gather relevant information about the pollen and nectar sources, foraged by honey bees in an area, which is a decade–old expansion of the city on an arable land. The pollen assemblages revealed one monofloral and two multifloral honey samples, ultimately provide insights into the variety of plants foraged by honey bees in an urban set–up, and is a potential archive for observing decadal changes in plant diversity. The carbon stable isotopic (δ13C) values of all the natural honeys varied from ~ –25 to –26‰, which relates to the regional vegetation types and environmental conditions. The difference between the filtered (without pollen) and unfiltered honey is ≤ 1.00‰. The δ13C values of the three commercial honey, which are filtered /without pollen are same i.e. –27‰. Hence, it is suggested that honey with pollen of diverse flora of the study area should be preferred by the consumers as a pure and also as a clinically safe food product.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"37 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138946929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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XXI INQUA Congress 2023 Rome, Italy: India’s successful bid to host the INQUA Congress in 2027 2023 年第 21 届 INQUA 大会，意大利罗马：印度成功申办 2027 年 INQUA 大会

Journal of Palaeosciences Pub Date : 2023-12-22 DOI: 10.54991/jop.2023.1867

B. Phartiyal, Swati Tripathi, Manoj Mc

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Palaeoenvironmental and stratigraphical implications of the palynoflora and macro–charcoal from the early Permian of the Chuperbhita Coalfield, Rajmahal Basin, Jharkhand, India 印度恰尔肯德邦拉杰马哈尔盆地 Chuperbhita 煤田早二叠世古生物群和大型炭化物的古环境和地层学意义

Journal of Palaeosciences Pub Date : 2023-12-22 DOI: 10.54991/jop.2023.1865

S. Murthy, Deepa Agnihotri, Prof. Dieter Uhl, Prof. Andre Jasper, Ranjit Kumar Singh

{"title":"Palaeoenvironmental and stratigraphical implications of the palynoflora and macro–charcoal from the early Permian of the Chuperbhita Coalfield, Rajmahal Basin, Jharkhand, India","authors":"S. Murthy, Deepa Agnihotri, Prof. Dieter Uhl, Prof. Andre Jasper, Ranjit Kumar Singh","doi":"10.54991/jop.2023.1865","DOIUrl":"https://doi.org/10.54991/jop.2023.1865","url":null,"abstract":"Palynological and macro–charcoal studies have been carried out on fossiliferous material from the upper seam of the Barakar Formation of Simlong Open Cast Mine (OCM), Chuperbhita Coalfield, India. The palynoassemblage exhibits a dominance of non– striate bisaccate pollen, mainly Scheuringipollenites, and a subdominance of striate bisaccate pollen assignable to Faunipollenites, suggesting an early Permian age (Artinskian). The presence of macro–charcoal indicates the occurrence of wildfire at the time of deposition of the Barakar Formation at Simlong OCM. The composition of the palynological assemblage, as well as anatomical details of the macro–charcoal, indicate that the source vegetation was dominated by gymnosperms. The non–abraded edges of many charcoal fragments suggest that the charcoal has not been transported over a long distance, indicating local to regional fires. Together with previous records of macro–charcoal, and the high inertinite contents of many Permian coals from India, this study further supports the widespread occurrence of palaeo–wildfires as frequent sources of disturbance in continental ecosystems in this part of Gondwana during the early Permian.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"33 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138945848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Late Oligocene atmospheric carbon dioxide concentrations reconstructed from fossil leaves using stomatal index 利用气孔指数从化石叶片重建晚渐新世大气二氧化碳浓度

Journal of Palaeosciences Pub Date : 2023-12-22 DOI: 10.54991/jop.2023.1860

Tekie F. Tesfamichael

{"title":"Late Oligocene atmospheric carbon dioxide concentrations reconstructed from fossil leaves using stomatal index","authors":"Tekie F. Tesfamichael","doi":"10.54991/jop.2023.1860","DOIUrl":"https://doi.org/10.54991/jop.2023.1860","url":null,"abstract":"Ancient atmospheric CO2 can be reconstructed using various climate proxies; stomata from fossil leaves are one of the climate proxies that provide critical information about past climatic conditions of the Earth. Exceptionally well–preserved fossil leaves found in overbank deposits in Chilga of Northwest Ethiopia were used to estimate late Oligocene atmospheric CO2 values using stomatal index. The age of the fossils, 206Pb/238U: 27.23 ± 0.03 Ma, was determined from zircons in an ash deposit comprising the matrix deposited contemporaneously with the fossil leaves. Stomatal indices were calculated from both the fossil leaves and nearest living relatives of the fossils. Corresponding atmospheric CO2 values for the nearest living relatives of the fossils were assigned from historical records from the Mauna Loa Observatory. This produces a calibrating curve that shows variation of atmospheric CO2 over time, and late Oligocene atmospheric CO2 values were quantified from the calibrating curve. The quantified late Oligocene atmospheric CO2 values are about 343 ± 11 ppm which show a 12 % decrease when they are quantified using a leaf gas exchange method. This is consistent with the idea that stomatal–index method underestimates CO2 values compared to the leaf gas exchange method. The late Oligocene was colder than both its preceding Eocene and its following Miocene epochs, and the results are incongruent with the cold Oligocene period. These results for this particular geologic time provide opportunity to examine how plants responded to climate changes in the past and have important implications for the study of current and future climate changes.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"85 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139164095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Early Eocene biotic assemblage from the sedimentary deposits of the Tarkeshwar Lignite Mine, Gujarat and its palaeoenvironmental implications 古吉拉特邦塔克什瓦尔褐煤矿沉积物中的始新世早期生物组合及其对古环境的影响

Journal of Palaeosciences Pub Date : 2023-12-22 DOI: 10.54991/jop.2023.1864

P. Uddandam, Priyadarshini Agnihotri, Shailesh Agrawal, Hukam Singh

{"title":"Early Eocene biotic assemblage from the sedimentary deposits of the Tarkeshwar Lignite Mine, Gujarat and its palaeoenvironmental implications","authors":"P. Uddandam, Priyadarshini Agnihotri, Shailesh Agrawal, Hukam Singh","doi":"10.54991/jop.2023.1864","DOIUrl":"https://doi.org/10.54991/jop.2023.1864","url":null,"abstract":"The Palaeogene biota and the palaeoenvironmental history from the low latitudes are remarkably well–preserved in theopen–cast lignite deposits from Western India. Lignite sequences of the Cambay Shale Formation (Gujarat) have been a majorsource to understand the concept of early evolution of fossils including flora, arthropods, vertebrates fauna, and several aquaticforms during the Early Eocene. The study deals with an extensive record of amber inclusions and extracted pollen, vertebratefragments, dinoflagellate cysts and Carbon isotopes from the lignite and associated sediments from the Tarkeshwar Lignite Mineto add insights into the palaeoenvironment and depositional conditions of the Cambay Basin during the Early Eocene period. Thecurrent study demonstrates that throughout the late Palaeocene and early Eocene epoch, the palaeoenvironment changed fromlow land, marshy (lower portion), to shallow marine environment, presumably due to hyperthermal event PETM (middle part).Age diagnostic taxa, viz. Auxiodinium longispinosum, Apectodinium parvum and early wetzelielloid (Vallodinium? sp.) excursionprovide late Palaeocene–early Eocene period (~56–53 Ma) for the dinocyst interval in the middle part of the section. A pronouncednegative Carbon Isotope Excursion (CIE) in the middle part is correlated to the second Eocene Thermal maximum (53.7 Ma),which is a globally recorded hyperthermal event. During the ETM–2 warming, the rise in pCO2 caused warm, humid conditionsas well as a rise in sea level, which may have contributed to the establishment of constrained shallow marine environments in theexamined middle unit sedimentary succession. Floral (spore–pollens, leaf, wood, seed, fruits) and faunal assemblages (Crocodiles,fish remains, amber insects) revealed the prevalence of a dense tropical luxurious rain forest (floral and faunal) near shore duringthe ETM–2 in the Tarkeshwar Lignite Mines, Cambay Basin.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"26 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139166061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Large–leaved Annularia species (Equisetopsida) in Pennsylvanian Variscan Euramerica–a Preliminary Review 欧洲宾夕法尼亚瓦里斯坎时期的大叶报春花属物种（Equisetopsida）--初步回顾

Journal of Palaeosciences Pub Date : 2023-12-22 DOI: 10.54991/jop.2023.1859

Christopher Cleal

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INQUA in India: Some Reminiscences and Some Anticipations 印度的 INQUA：一些回忆和一些期待

Journal of Palaeosciences Pub Date : 2023-12-22 DOI: 10.54991/jop.2023.1869

A.K. Singhvi

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National Workshop on Biodiversity & Conservation in the Himalayan Region 喜马拉雅地区生物多样性与保护国家研讨会

Journal of Palaeosciences Pub Date : 2023-12-22 DOI: 10.54991/jop.2023.1866

Ansuya Bhandari, Mohd Hussain, Priyanka Ashokrao Ingle, Anil Kumar

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Fluid–rock interaction in the basement granitoids: A plausible answer to recurring seismicity 基底花岗岩中的流体-岩石相互作用:对重复地震活动的合理解释

Journal of Palaeosciences Pub Date : 2023-07-14 DOI: 10.54991/jop.2023.1853

M. Shukla, Piyal Halder, K. Kumar, Anupam Sharma

{"title":"Fluid–rock interaction in the basement granitoids: A plausible answer to recurring seismicity","authors":"M. Shukla, Piyal Halder, K. Kumar, Anupam Sharma","doi":"10.54991/jop.2023.1853","DOIUrl":"https://doi.org/10.54991/jop.2023.1853","url":null,"abstract":"The Koyna–Warna Seismogenic Region in the western part of the Indian Subcontinent has been recognized as one of the most significant sites of Reservoir–Triggered–Seismicity (RTS) during the last five decades. The basement granitoids, overlain by the porous and vesicular Deccan Trap basalt, contain numerous interconnecting fractures which act as the ascending and descending pathways of fluid flow. As a result of this fluid flow along fractures, the host rock has been subjected to significant chemical alteration along with the subsequent formation of some new minerals at the expense of a few other pre–existing mineral phases. Mesoscopic observations followed by Optical microscopy in the core samples of the basement rocks upto 1.5 km depth retrieved from the borehole KBH1 near Rasati (about 4.7 km from the Koyna Dam) have revealed the presence of chlorite and the precipitation of calcite, whereas the bulk mineralogical XRD has reaffirmed the presence of chlorite, calcite along with illite at a certain depth. This entire secondary mineral assemblage resembles the propylitic kind of hydrothermal alteration at temperatures < 350°C under acid–to–neutral solution conditions and also indicates water channelization up to the deeper level in the basement granitoids (>1.5 km). In addition, the presence of the hydrophilic clay minerals along fault and fracture zones may be responsible for triggering the seismicity in the Koyna Seismogenic Region as their absorption of water reduces the shear strength of faults and their low frictional strength accelerates the fault weakening process causing the generation of slip surfaces. Thus, in addition to several seismotectonic features, fault geometry and existing stress pattern, the clay mineralisation along the pre–existing faults and fractures of the basement rocks may also be a factor behind the recurring seismicity in this region.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128340227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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