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Synchronous Transformations of Mineral and Organic Constituents of Sedimentary Rocks in Geological Structure with an Initial Extension and Subsequent Compression Tectonic Regime |
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| Authors: | Petrova V V Nginh Le Thi Stukalova I E Sokolova A L Huyen Nguyen Xuan Pha Phang Dong |
| Institution: | (1) Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia;(2) Institute of Geology, National Center of Science and Technologies of Viet Nam, Nghihia Do Tu Liem Vien Dia Chat, Hanoi, Viet Nam |
| Abstract: | Sedimentary rocks of the section in the Red River fold zone of northern Viet Nam are considered. It is shown that secondary mineral parageneses formed in two stages. The first stage (35–17 Ma ago) corresponded to the period of structure extension and sediment subsidence to a depth of about 6 km. This period and subsequent  10 Ma were marked by the formation of a usual dia- and catagenetic zoning of metasedimentary rocks. The second stage (5–7 Ma ago) corresponded to processes of compression that were responsible for the deformation of rocks into gentle folds and 1.5 to 2.2 times contraction of the section thickness in different places. The sequential–mineralogical zoning was disturbed at this stage. Smectites and mixed-layer minerals were replaced by chlorites and hydromicas. Organic material also responded to compression simultaneously with inorganic components. The bituminous component was released from humic matter and rocks became enriched in hydrocarbons. |
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