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Quy trình gia công và phân tích hóa thạch tảo vôi, áp dụng cho các trầm tích ven biển tỉnh Sóc Trăng

Bài viết giới thiệu quy trình gia công, phân tích mẫu hóa thạch tảo vôi và một số kết quả áp dụng cho các trầm tích ven biển tỉnh Sóc Trăng. | Quy trình gia công và phân tích hóa thạch tảo vôi áp dụng cho các trầm tích ven biển tỉnh Sóc Trăng Vietnam Journal of Marine Science and Technology Vol. 19 No. 4 2019 537 544 DOI https doi.org 10.15625 1859-3097 19 4 12676 http www.vjs.ac.vn index.php jmst The process of preparation and analysis of calcareous nannofossil sample and application for marine sediments of Soc Trang province Nguyen Thi Hong Nhung Nguyen Thi Thuy Nguyen Viet Hien Nguyen Huu Manh Institute of Geosciences and Mineral Resources Hanoi Vietnam E-mail nthnhung@monre.gov.vn nhungbokho@gmail.com Received 30 December 2018 Accepted 24 July 2019 2019 Vietnam Academy of Science and Technology VAST Abstract Calcareous nannofossils are very small microfossils composed of calcium carbonate. They are very good biostratigraphic markers within marine sediments by covering the Jurassic to present. The standard preparation of a sample for nannofossil analysis requires the collection of the largest quantity and the best fossils. Sample preparation accords to the following steps i. Pounding sample ii. Eliminating organic matter iii. Washing sample iv. Filter sample through the sieve v. Eliminating clay vi. Drying sample in an incubator vii. Packing sample. Sample analysis accords to the following steps i. Preparation of smear - slide ii. Observation of morphology iii. Determination iv. Taking photo v. Evaluating overall preservation and abundance of fossils vi. Making analysis result sheet. This process is applied to study calcareous nannofossils within marine sediments in Soc Trang province. It makes much clear to understand middle Pleistocene-early Holocene ecosystem of calcareous nannofossil. In conclusion this assemblage belongs to NN21 zone by the present of Emiliania huxleyi and Gephyrocapsa oceanica. Keywords Calcareous nannofossils process of preparation and analysis Soc Trang coastal area. Citation Nguyen Thi Hong Nhung Nguyn Thi Thuy Nguyen Viet Hien Nguyen Huu Manh 2019. The process of .