里卡河盆地次西里西亚推覆体地质(乌克兰喀尔巴阡山脉,霍利亚廷构造)

O. Hnylko
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引用次数: 0

摘要

作者详细的地质填图工作表明,Holyatyn构造(位于乌克兰喀尔巴阡山脉外喀尔巴阡地区Rika河流域Holyatyn村和Maidan村附近)是位于西里西亚和Skyba推覆体之间的外喀尔巴阡山脉亚西里西亚推覆体的一个破碎片段。在该构造内,下白垩统-渐新统沉积物发育于邻近构造单元渐新统复理石中。这些矿床的地层演替表现为:深色至黑色复理岩(巴雷米亚-阿尔比安Shypot组);有燧石的绿色页岩;红色和绿色页岩和泥灰岩(上白垩世-古新世Holyatyn地层);绿的和暗的到黑色的复理石(始新世的索米组);黑色页岩、燧石和砂岩(渐新世Menilite组)和灰色复理石层黑色页岩(渐新世Verets组或过渡组)。逆冲板前缘发育石灰岩块体(年龄不详)。根据沉积学特征(典型的半浮游岩)、年龄和微动物群含量,Holyatyn层对应于波兰喀尔巴阡山脉Subsilesian单元的Weglowka Marls,而Weglowka Marls是Subsilesian单元的“诊断岩相”。Holyatyn构造可能是一个“挤压透镜体”,其背斜核心由变形的下白垩统复理石层和延性的上白垩统粘土-泥质Holyatyn层组成。这种挤压明显发生在推覆构造形成之后,是由逆压运动引起的。结果,相对较薄且韧性较好的亚西里推覆体被拉伸成位于相邻构造推覆体的刚性复理石之间的独立构造透镜体(大型体)。其中一个透镜是Holyatyn结构,它类似于压迫的“花结构”。在西里西亚/次西里西亚推覆构造逆冲带暴露出一韧性型混杂岩。说明初始逆冲阶段发生在低固结水饱和沉积物中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
GEOLOGY OF THE SUB-SILESIAN NAPPE IN THE RIKA RIVER BASIN (UKRAINIAN CARPATHIANS, HOLYATYN STRUCTURE)
The author's detailed geological mapping works suggest that the Holyatyn Structure (located near the villages of Holyatyn and Maidan in the Rika River basin, Ukrainian Carpathians, Transcarpathian administrative region) is a destructured fragment of the Sub-Silesian Nappe located in the Outer Carpathians between the Silesian and Skyba nappes. Within this structure, Lower Cretaceous–Oligocene deposits are developed among the Oligocene flysch of neighboring tectonic units. The stratigraphic succession of these deposits is represented by: dark to black flysch (Shypot Formation, Barremian–Albian); green shales with cherts; red and green shales and marls (Holyatyn Beds, Upper Cretaceous–Paleocene); greenish and dark to black flysch (Soimy Formation, Eocene); black shales, cherts and sandstones (Menilite Formation, Oligocene) and gray flysch with layers of black shales (Verets or Transitional Formation, Oligocene). The limestone blocks (unknown age) is developed in front of the thrust-sheet. According to sedimentological features (typical hemipelagites), age and microfauna content, the Holyatyn Beds correspond to the Weglowka Marls of the Subsilesian Unit in the Polish Carpathians, while the Weglowka Marls are a “diagnostic lithofacies” for the Subsilesian Unit. The Holyatyn Structure is probably an “extruded lens”, the anticline core of which is composed of deformed Lower Cretaceous flysch and ductile Upper Cretaceous clay-marly Holyatyn Beds. This extrusion apparently occurred after nappe structure forming and was caused by transpressive movements. In result, the relatively thin and ductile Subsilesian Nappe was stretched into separate tectonic lenses (large boudins ?) placed between the rigid flysch of neighboring tectonic nappes. One such lens is the Holyatyn Structure, which is similar to the transpressive “flower structure”. A ductile-type melange is exposed in the thrust zone of the Silesian/Sub-Silesian nappes. It suggests that the initial thrust stage occured in poorly consolidated water-saturated sediments.
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