Early-Middle Jurassic lithological and depositional facies of the Da Lat back-arc basin
The Da Lat back-arc basin formed on a deformed lithosphere caused by subduction of the Paleo-Pacific plate under Eurasia in the Mesozoic.
Lithology and sedimentary structure analysis from field works and UAV imaging show that the Early-Middle Jurassic deposits in this area can be divided into 7 types of litho-depositional facies: (i) coastal conglomerate; (ii) channel/shallow lake sandstone; (iii) shoreface sandstone; (iv) estuarine siltstone and mudstone; (v) deep marine shale; (vi) mass transport deposits; and (vii) turbidite.
These facies’ spatio-temporal distributions are closely related to their grain size. In the basin margin, Early Jurassic coarse-grained deposits are exposed, marking the opening of the basin, grading upward into shallow marine-shelf deposits. In the Middle Jurassic, the basin margin was uplifted corresponding to continental depositional environment, while the basin centre was filled by outer shelf deposits, reflecting a deepening process. Interbedding with these deposits are near shore and estuarine deposits.
Tran Van Tri and Vu Khuc, Geology and earth resources of Vietnam. Publishing House for Science and Technology, 2011.
Nguyễn Kim Hoàng, “Phân vùng sinh khoáng và triển vọng quặng hóa vàng đới Đà Lạt”, Tạp chí Phát triển Khoa học và Công nghệ, Tập 16, Số M2, trang 85 - 96, 2014.
La Thị Chích, Trịnh Văn Long, Nguyễn Kim Hoàng, và cộng sự, “Sự tiến hóa của dãy pluton - núi lửa Mesozoi muộn đới Đà Lạt và khoáng sản liên quan”, Tuyển tập Báo cáo Hội thảo Khoa học: Nghiên cứu cơ bản trong lĩnh vực các khoa học về Trái đất phục vụ phát triển bền vững kinh tế - xã hội khu vực Nam Bộ, 2004, trang 162 - 174.
Tong Duy Thanh, Vu Khuc, Stratigraphic units of Vietnam, Vietnam National University Publishing House, 2006.
Fucheng Li, Zhen Sun, and Hongfeng Yang, “Possible spatial distribution of the Mesozoic Volcanic Arc in the Present-Day South China Sea continental margin and its tectonic implications”, Journal of Geophysical Research: Solid Earth, Vol. 123, No. 8, pp. 6215 - 6235, 2018. DOI: 10.1029/2017JB014861.
Vũ Khúc, N.R. Abramov, Vũ Châu, Bùi Phú Mỹ, và Nguyễn Đức Thắng, “Về sự phân chia chi tiết trầm tích Jura biển ở phía nam khối Kon Tum”, Bản đồ Địa chất, Số 56, trang 44 - 51, 1983.
Jian-Xin Cai and Kai-Jun Zhang, “A new model for the Indochina and South China collision during the Late Permian to the Middle Triassic”, Tectonophysics, Vol. 467, No. 1 - 4, pp. 35 - 43, 2009. DOI: 10.1016/j.tecto.2008.12.003.
Andrew Carter and Peter D. Clift, “Was the Indosinian orogeny a Triassic mountain building or a thermotectonic reactivation event?”, Comptes Rendus Geoscience, Vol. 340, No. 2 - 3, pp. 83 - 93, 2008, DOI: 10.1016/j.crte.2007.08.011.
William J. Schmidt, James W. Handschy, Bui Huy Hoang, Christopher K. Morley, Do Van Linh, Nguyen Thanh Tung, and Nguyen Quang Tuan, “Structure and tectonics of a Late Jurassic, arcuate fold belt in the Ban Don Group, Southern Vietnam”, Tectonophysics, Vol. 817, 2021. DOI: 10.1016/j.tecto.2021.229040.
Zheng-Xiang Li and Xian-Hua Li, “Formation of the 1300-km-wide intracontinental orogen and postorogenic magmatic province in Mesozoic South China: A flat-slab subduction model”, Geology, Vol. 35, No. 2, pp. 179 - 182, 2007, DOI: 10.1130/G23193A.1.
Bilal U. Haq, “Jurassic sea-level variations: A reappraisal”, GSA Today, Vol. 28, No. 1, pp 4 -10, 2018. DOI: 10.1130/GSATG359A.1.
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