Nghiên cứu phát triển phương pháp tính thành phần hóa học dung thể magma basalt nguyên thủy giai đoạn Cenozoi khu vực ven biển và ngoài khơi Nam Trung Bộ

Bài viết cập nhật, bổ sung các tham số đầu vào và xây dựng phương pháp xác định thành phần dung thể magma nguyên thủy khu vực ven biển và ngoài khơi Nam Trung Bộ. | Nghiên cứu phát triển phương pháp tính thành phần hóa học dung thể magma basalt nguyên thủy giai đoạn Cenozoi khu vực ven biển và ngoài khơi Nam Trung Bộ Vietnam Journal of Marine Science and Technology Vol. 19 No. 3B 2019 55 70 DOI https 1859-3097 19 3B 14515 https jmst Establishing calculation method for chemical composition of primitive magma in the Cenozoic in South Central coast region and the adjacent continental shelf of Vietnam Le Duc Anh1 2 Nguyen Hoang2 3 Phung Van Phach1 2 A. I. Malinovskii4 Renat Shakirov5 Kasatkin S. Golozubov V. Bui Van Nam1 Mai Duc Dong1 Ngo Bich Huong1 Pham Thu Hien1 1 Institute of Marine Geology and Geophysics VAST Vietnam 2 Graduate University of Science and Technology VAST Vietnam 3 Institute of Geological Sciences VAST Vietnam 4 Far East Geological Institute of Far East Branch of Russian Academy of Sciences Vladivostok Russia 5 Il ichev Pacific Oceanographical Institute FEB RAS Vladivostok Russia E-mail leducanh010282@ Received 25 July 2019 Accepted 6 October 2019 2019 Vietnam Academy of Science and Technology VAST Abstract The calculations which determine the chemical composition of the primitive magma are simple but they show changes in the temperature and pressure states of the magma source. The method is based on the addition of the chemical composition of the Olivine to the major element composition of the eruptive rocks which follows the formula Ci Ci-1 Ci-1Ol. In accordance with the characteristics of the study area we have made new additions to the calculation method. The calculation results are highly accurate when tested and compared with the chemical composition of the eruptive rocks. The chemical composition of the primitive magma solution is used to calculate the temperature and pressure states in the magma source. The results show that there is a difference in temperature and pressure in the source at different tectonic positions in the study area. .