Indian Association of Sedimentologists最新文献

{"title":"Indian Association of Sedimentologists","authors":"G. N. Nayak","doi":"10.51710/jias.v40ii.272","DOIUrl":"https://doi.org/10.51710/jias.v40ii.272","url":null,"abstract":"The idea to constitute a forum Indian Association of Sedimentologists (IAS) was floated in the valedictory session of a conference hosted by Delhi University, Delhi in 1975, for providing an opportunity to sedimentologists of the country to meet, discuss and extend ideas of mutual interest. The idea was appreciated and got support from veteran geologists and academicians. Soon after, in 1976, the Indian Association of Sedimentologists was formed and duly registered with its headquarters at the Department of Geology, Aligarh Muslim University, Aligarh in recognition of leading research carried out in the Department in the field of sedimentology.","PeriodicalId":159349,"journal":{"name":"Indian Association of Sedimentologists","volume":"80 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139367613","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}

{"title":"Reservoir characterization and rock eval pyrolysis of clastic sedimentary rocks in the Geku Formation, Arunachal Pradesh, North-eastern India","authors":"Anannya Bordoloi, Ananya Chutia, C. Taye","doi":"10.51710/jias.v40ii.284","DOIUrl":"https://doi.org/10.51710/jias.v40ii.284","url":null,"abstract":"The present investigation aims to decipher the reservoir quality and source rock potential of the sandstones and shales of the Geku Formation of the Yinkiong Group, Eastern Himalaya, NE India. To achieve the goal, sandstone petrography and rock-eval pyrolysis of shale aided with X-Ray diffraction have been employed. A petrographic study revealed that the detrital constituent of the sandstones is mainly quartz, feldspar, and lithic fragments. Authigenic cements such as carbonate and clay bind the detrital materials as indicated by petrographic as well as X-Ray diffraction study. Clay minerals include illite, smectite-montmorillonite and kaolinite. The studied sandstones underwent compaction as evidenced by the formation of concavo-convex and sutured grain contacts, which also suggest its phyllomorphic stage of diagenesis. The presence of calcite and clay cement has led to reduction of the porosity and permeability of sandstones, which is also substantiated by sorting and irregular grain shapes such as sub-angular, angular, and sub-rounded, thereby affecting reservoir quality. The rock eval pyrolysis data suggests that the Yinkiong shales have poor source rock potential with dominantly kerogen type III. The geochemical parameters of the studied shales suggest mostly immature and postmature organic matter and the very low TOC values indicate poor organic richness.","PeriodicalId":159349,"journal":{"name":"Indian Association of Sedimentologists","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139367018","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}

{"title":"Tectonic setting of Kaladgi-Badami basin and its possible connection with adjacent Proterozoic basins, Karnataka, India","authors":"Sukanta Goswami, Suman Das, Prathamesh S Samant, T. V. Kumar, Kalyan Chakrabarti, B. G. Prakash","doi":"10.51710/jias.v40ii.292","DOIUrl":"https://doi.org/10.51710/jias.v40ii.292","url":null,"abstract":"Sedimentary rock types and basin geometries are interrelated with characteristic tectonic settings. In fact, sedimentation pattern at central stable cratonic areas are not same as that on continental margins. Kaladgi-Badami (KB) basinal feldspathic arenite (i.e., arkose) dominated rocks contain more plagioclase than potassium feldspar unlike the opposite scenario of Phanerozoic sandstones. Tectonic history of the KB basin has been interpreted since basin development, sedimentation through interrupting hiatus, tectonic reworking, redeposition at later developed depocenters and later exhumation, erosion, tectonism till Deccan volcanism and finally latest configuration. As per the International commission of Stratigraphy (ICS), principles of stratigraphic classification and usages of terminology of fundamental lithostratigraphic unit ‘Formation’ is reexamined in this paper. The definition of Formation as “smallest mappable rock unit with a definite lithologic characteristic that allow it to be distinguished from other such units” is improperly used because without mentioning a specific scale every unit is mappable or traceable. Therefore, the minimum mappable unit means the unit which can be at least visible in a scale in which entire basin can be seen. Based on this slight modification is proposed in the stratigraphy of KB basin. Geochronology based radiometric stratigraphy is best tool for determination of time sequence of geological events. However, it is always a matter of concern that dating methods and materials are often not suitable in sedimentary geology. In case of passive rifted sedimentary basins like Kaladgi, Badami and Bhima of the Dharwar Craton, there is negligible igneous events and indirect dating methods are mostly available. Detrital zircon dating can give maximum age or provenance age, which cannot be of much use. However, there are other indirect tools, which are already utilized by several workers earlier and based on the reviews and present observation and mapping compilation it is proposed that KB and Bhima basins used to be a single basin, and later tectonism followed by Deccan volcanism affected the present geographic continuity. Since the distance between westernmost Bhima basinal rocks and easternmost KB basinal rocks near Mudhebihal is nearly around 15km, it is logical to consider that these were geographically connected, because there is an intense faulting near to these basin margins.","PeriodicalId":159349,"journal":{"name":"Indian Association of Sedimentologists","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139366703","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}

{"title":"Textural characteristics and abundance of microplastics in the Nethravati river estuary sediments, south-west Mangalore beach, India","authors":"D. M. S.,, K. Siddaraju, P. Mahadesh","doi":"10.51710/jias.v40ii.285","DOIUrl":"https://doi.org/10.51710/jias.v40ii.285","url":null,"abstract":"Microplastics commonly enter the world's sea through rivers and estuaries. Yet somehow, very little is known about what happens to plastic waste in estuaries. This study provides important information on the Microplastics (MP's) distribution and features in the Nethravati estuary. The present level of knowledge on microplastic trash dispersal in estuaries and their intertidal ecosystems. The MPs identified in this were classified as: source (Primary and secondary MPs), size < 1000 ?m (78%), followed by >1000 ?m (22%), color (coloured plastic (32%) and white plastic (68%), shape (fibre (96%), beads (3%), fragment (1%). The polymer types detected are Polyamide (60%), polyethylene (33%), followed by polypropylene (5%) and polystyrene (2%). We observed that secondary MPs were the most often recovered microplastics in 22 samples, indicating that primary microplastics had been destroyed by photo-degradation, chemical degradation, and biological degradation. According to the FTIR study, polyamide and polyethylene were the most common microplastics, followed by polystyrene and polypropylene. Future research to track MPs abundance along the Netravati estuary's shoreline can utilize the results of this study as guidelines. The best methods to prevent the abundance of MPs in estuary sediments are to manage solid wastes properly, implement laws, and spread awareness about the cause of MPs to the ecosystem.","PeriodicalId":159349,"journal":{"name":"Indian Association of Sedimentologists","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139367684","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}