Journal of Palaeosciences最新文献_第4页

Palaeoclimatic variability during last eight millennia from a morainal lake in Zanskar, northwest Himalaya, India 印度喜玛拉雅西北部赞斯卡的一个冰川湖，近八千年来的古气候变化

Journal of Palaeosciences Pub Date : 2022-07-22 DOI: 10.54991/jop.2022.545

B. Phartiyal, S. Nawaz Ali, Anupam Sharma, Shailesh Agrawal, D. Nag, P. Tiwari, Mohan Kumar, P. Morthekai, P. Govil, B. Thakur, R. Bhushan, P. S. Jena, A. Shivam

{"title":"Palaeoclimatic variability during last eight millennia from a morainal lake in Zanskar, northwest Himalaya, India","authors":"B. Phartiyal, S. Nawaz Ali, Anupam Sharma, Shailesh Agrawal, D. Nag, P. Tiwari, Mohan Kumar, P. Morthekai, P. Govil, B. Thakur, R. Bhushan, P. S. Jena, A. Shivam","doi":"10.54991/jop.2022.545","DOIUrl":"https://doi.org/10.54991/jop.2022.545","url":null,"abstract":"Centennial–scale palaeoenvironmental variability has been deduced during past eight millennia using multi–proxy study (textural analysis, environmental magnetic parameters, stable carbon isotopes, palynofacies and elemental concentration), from Khangok–Padam in Zanskar Valley, northwest Himalaya. The multi–proxy record from this morainal lake spanning last ~8200 cal years BP has revealed four hydroclimatic phases. The overall progressively improving hydroclimatic trend is indicated by multi proxy study: sediment size/texture (as a proxy for the energy condition and depositional environment), mineral magnetism (proxy for sediment flux or lithogenic input and lithologic variation), carbon isotope signature (δ13Corg) preserved in organic constituents of sediments (a proxy for palaeovegetation and climate change), elemental geochemistry (proxy for weathering and erosion) and selected samples for palynofacies data (a proxy for changes in biological organic matter). This improving hydroclimatic trend is however punctuated by an abrupt wet spell at ~6200–5200 cal years BP and relatively drier climate during the Little Ice Age between 1400 and 1900 CE. The main driving force implicated for the changes are seen to be the solar output variations. The area lying in a transitional climatic zone of NW Himalaya shows no emphatic record of the events like the 4200 cal. years BP, 2600 cal. years BP and Holocene Climatic Optima. Contrary to the earlier studies in the region (e.g., Tsokar and TsoMorari), our results show an improving hydroclimatic condition in this transition climatic zone between the Indian Summer Monsoon dominated Higher and westerly dominated Trans Himalaya.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116706606","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

28th Indian Colloquium on Micropalaeontology and Stratigraphy 第28届印度微体古生物学和地层学研讨会

Journal of Palaeosciences Pub Date : 2022-07-22 DOI: 10.54991/jop.2022.999

Swati Tripathi, A. Pandey, A. Saxena, Neelam Das, A. Bhandari, Ipsita Roy, Priyanka Joshi, S. Singh, G. Singh, Nidhi Tomar, Priyadarshini Agnihotri, D. P. Mishra

引用次数: 0

Depositional environments in the White Nile Valley during the last 300,000 years 白尼罗河谷过去30万年的沉积环境

Journal of Palaeosciences Pub Date : 2022-07-22 DOI: 10.54991/jop.2022.36

Martin A. J. Williams, M. R. Snow, Peter G. Self, M. Raven, E. Cowan

{"title":"Depositional environments in the White Nile Valley during the last 300,000 years","authors":"Martin A. J. Williams, M. R. Snow, Peter G. Self, M. Raven, E. Cowan","doi":"10.54991/jop.2022.36","DOIUrl":"https://doi.org/10.54991/jop.2022.36","url":null,"abstract":"Before regulation, the White Nile contributed 83% of the low water flow to the main Nile and was responsible for maintaining the Nile as a perennial river during times of drought in Ethiopia. Two key unresolved questions relating to the White Nile are:\u0000 (a) When did the White Nile first join the main Nile?\u0000 (b) What type of sediment did the White Nile contribute to the main Nile?\u0000The answer to the first question has important implications for our understanding of hydro–climatic and tectonic events in the Ugandan Lake Plateau. The answer to the second question is essential for correctly interpreting the sedimentary record preserved in the Nile deep sea fan in the eastern Mediterranean. Our work has shown for the first time that the White Nile has been transporting smectite–rich sediments from the time of its probable inception over 240 ka ago and possibly since about 400 ka. Our analysis of the heavy mineral assemblages in White Nile alluvial sediments provides strong support for a source in the Lake Plateau region of Uganda. The White Nile was flowing from Uganda by at least 240 ka and very likely from about 400 ka.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124435443","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: 1

1st Indian Quaternary Congress (IQC)– 2022 Organized by the Association of Quaternary Researchers (AoQR) 第一届印度第四纪会议(IQC) - 2022年由第四纪研究协会(AoQR)主办

Journal of Palaeosciences Pub Date : 2022-07-22 DOI: 10.54991/jop.2022.670

Anil Kumar, P. Bisht

引用次数: 0

Internal structure of Cambrian vendobionts Arumberia, Hallidaya, and Noffkarkys preserved by clay in Montana, USA 美国蒙大拿州寒武系盘生植物Arumberia、Hallidaya和Noffkarkys的内部结构

Journal of Palaeosciences Pub Date : 2022-07-22 DOI: 10.54991/jop.2022.539

G. Retallack

引用次数: 0

Palynology of the North Karanpura basin, Bihar, India 4. Subsurface Palynology of the bore-hole no. K.5 印度比哈尔邦北卡兰普拉盆地孢粉学钻孔的地下孢粉特征。K.5

Journal of Palaeosciences Pub Date : 2022-06-16 DOI: 10.54991/jop.1968.534

R. K. Kar

引用次数: 0

Palynology of the Umia plant beds of Kutch, W. India - 2. Bhuj exposures near Walkamata, Kutch district, Gujarat state - Systematic palynology 印度西部Kutch地区Umia植物床孢粉学研究- 2。古吉拉特邦库奇区Walkamata附近的Bhuj暴露-系统孢粉学

Journal of Palaeosciences Pub Date : 2022-06-16 DOI: 10.54991/jop.1968.533

B. S. Venkatachala

引用次数: 1

Fossil woods of Leguminosae and Anacardiaceae from the Tertiary of Assam 阿萨姆邦第三纪豆科和麻心科树木化石

Journal of Palaeosciences Pub Date : 2022-06-16 DOI: 10.54991/jop.1968.535

U. Prakash, P. P. Tripathi

引用次数: 2

Correlation of coal seams in Chirimiri coalfield, M.P., on the basis of sporae dispersae 基于孢子散布的Chirimiri煤田煤层对比

Journal of Palaeosciences Pub Date : 2022-06-16 DOI: 10.54991/jop.1968.537

D. Bhardwaj, S. C. Srivastava

{"title":"Correlation of coal seams in Chirimiri coalfield, M.P., on the basis of sporae dispersae","authors":"D. Bhardwaj, S. C. Srivastava","doi":"10.54991/jop.1968.537","DOIUrl":"https://doi.org/10.54991/jop.1968.537","url":null,"abstract":"Fifteen samples of coal collected from different parts of Chirimiri Coalfield, M.P., have been sporologically investigated. The qualitative and quantitative composition of the samples at generic level indicates that the general dominance is constituted by Lophotriletes, Microbaculispora, Indotriradites and Sulcatisporites. In addition to these, Horriditriletes, Retusotriletes, Potonieisporites, Faunipollenites and Ginkgocycadophytus are characteristically associated with the dominants. The association of these genera has enabled segregation of the samples into three assemblages. Assemblage A is dominated by Microbaculispora. Assemblage B is dominated by Microbaculispora in association with Indotriradites and Assemblage C has the dominance of Microbaculispora associated with Retusotriletes and Potonieisporites. It is suggested that the samples represent three coal seams corresponding to Assemblages A, B & C. \u0000The succession of mioflora in Chirimiri coalfield has been found to show general similarity with the succession of the three older coal seams in the northern part of Korba coalfield. The age of Chirimiri coal deposits is suggested as Lower Barakar.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127956221","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

Sur la presence d'un bois de meliacees dans le tertiaire du fezzan oriental : Entandrophragmoxylon boureaui louvet 在东费赞第三纪的meliacees森林的存在:Entandrophragmoxylon boureaui louvet

Journal of Palaeosciences Pub Date : 2022-06-16 DOI: 10.54991/jop.1968.536

J. Koeniguer, P. Louvet

引用次数: 0