gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2018-9-3-0372gtcrust-626Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSТЕКТОНИЧЕСКАЯ ЭВОЛЮЦИЯ ЮЖНОЙ ЧАСТИ ЦЕНТРАЛЬНОГО ВЬЕТНАМА И ПРИЛЕГАЮЩЕЙ ТЕРРИТОРИИTECTONIC EVOLUTION OF THE SOUTHERN PART OF CENTRAL VIET NAM AND THE ADJACENT AREAФатьФунг ВанPhachPhung Van

Phung Van Phach, PhD

Building A27, 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi

pvphach@yahoo.comАньЛе ДыкAnhLe Duc

Le Duc Anh

Building A27, 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi

educanh010282@gmail.comИнститут морской геологии и геофизики, Вьетнамская академия наук и технологийВьетнамInstitute of Marine Geology and Geophysics, Vietnam Academy of Science and TechnologyViet Nam20180810201893801825Copyright © Фать Ф., Ань Л., 20182018Фать Ф., Ань Л.Phach P., Anh L.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/626

Путем интерпретации данных о сейсмических, гравитационных и магнитных аномалиях, а также данных о структуре прибрежной зоны южной части Центрального Вьетнама и прилегающих к нему третичных впадин можно выделить несколько этапов тектонической эволюции изучаемого региона, с позднего мелового до четвертичного периода. Цель статьи – получить более точную картину тектонической эволюции южной части Центрального Вьетнама и прилегающей территории. Тектоническая фаза, датируемая как мел – палеоцен, началась после прекращения глубинного магматизма в западной части Тихого океана, приведшего к образованию многочисленных диабазов и аплитовых даек, ориентированных в основном субмеридионально. В течение этой фазы происходило меридиональное сжатие (С-Ю) и расширение в широтном направлении (З-В). В геоморфологическом и геологическом отношении ЮЗ Азия значительно изменилась в течение неотектонических фаз вследствие столкновения между Индийской плитой и Евразийским континентом. Ранняя и поздняя неотектонические фазы разделены региональным несогласием, которое установлено как поверхность, разграничивающая сильнодеформированные толщи (синрифтовые) и перекрывающие, менее деформированные формации (пострифтовые). Ранняя неотектоническая фаза, связанная с левосторонним смещением в зоне разлома Ред-Ривер, может быть разделена на две тектонические подфазы: эоцен – олигоцен (сжатие в СЗ-ЮВ направлении) и олигоцен – миоцен (широтное сжатие, В-З). В течение подфазы, датируемой как олигоцен – миоцен, возникли рифтовые впадины на континентальной окраине южной части Центрального Вьетнама. Поздняя неотектоническая фаза началась после прекращения сдвигового смещения в зоне разлома Ред-Ривер и прекращения расширения Восточного (Южно-Китайского) моря. Поздняя неотектоническая фаза также может быть разделена на две тектонические подфазы: поздний ранний миоцен (субмеридиональное сжатие) и поздний миоцен – плиоцен (сжатие в СВ-ЮЗ направлении). В течение подфазы, датируемой как поздний миоцен – плиоцен, происходили вертикальные движения, приведшие к формированию ряда поднятий на суше, а также опускания в районе морской впадины Фухань. При этом по всей южной части Индокитая и на континентальной окраине широко распространены миоцен-плиоцен-четвертичные базальтовые извержения.

Interpretations of seismic, gravity and magnetic anomalies and structural data on the coastal zone of southern part of Central Viet Nam (SCVN) and the adjacent Tertiary basins suggest several phases in the tectonic evolution of the study region since the Late Cretaceous to Quaternary. In this paper, we try to clarify the tectonic evolution of SCVN and the adjacent continental margin. The Cretaceous – Paleocene tectonic phase commenced after cessation of the West Pacific plutonic magmatic activity that produced numerous diabases and aplite dykes of mainly sub-meridian orientation. It was characterized by N–S compression and E–W extension. The geomorphology and geology ofSE Asiawere considerably changed during the Neotectonic phases caused by collision between the Indian plate and the Eurasian continent. Two tectonic phases – Early and Late Neotectonic – are separated by a regional unconformity represented by a boundary surface between below strongly deformed strata (synrift) and above less deformed formations (post-rift). The Early Neotectonic phase was related to the left-lateral movement of the Red River Fault Zone (RRFZ) and includes two tectonic sub-phases: Eocene – Oligocene (NW–SE compression), and Oligocene – Miocene (E–W compression). Activity in the Oligocene-Miocene sub-phase gave birth to rift basins in the continental margin of the SCVN. The Late Neotectonic phase began since the RRFZ stopped left-lateral movement and the East Viet Nam (orSouth China) Sea stopped spreading. The Late Neotectonic phase is also divided into two tectonic sub-phases: Late Early Miocene (sub-meridian compression), and Late Miocene – Pliocene (NE–SW compression). The Late Miocene – Pliocene sub-phase is characterized by vertical movements that caused episodic uplifting of the onland terrains, and subsidence of the offshore Phu Khanh basin. Besides, Miocene – Pliocene-Quarternary basaltic eruptions were widespread all over the southern Indosinian terrain and the continental margin.

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The authors declare that there are no conflicts of interest present.