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首页> 外文会议>2002 New Zealand Petroleum Conference Proceedings, Feb 24-27, 2002, Auckland New Zealand >Megasequence architecture of Taranaki, Wanganui, and King Country basins and Neogene progradation of two continental margin wedges across western New Zealand
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Megasequence architecture of Taranaki, Wanganui, and King Country basins and Neogene progradation of two continental margin wedges across western New Zealand

机译：Taranaki，Wanganui和King Country盆地的巨型层序结构以及横跨新西兰西部的两个大陆边缘楔形体的新近系发育

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Taranaki, Wanganui and King Country basins (formerly North Wanganui Basin) have been regarded as discrete basins, but they contain a very similar Neogene sedimentary succession and much of their geological history is held in common. Analysis of the stratigraphic architecture of the fill of each basin reveals the occurrence of four 2nd order megasequences of tectonic origin. The oldest is the early-early Miocene (Otaian Stage) Mahoenui Group/megasequence, followed by the late-early Miocene (Altonian Stage) Mokau Group/megasequence (King Country Basin), both of which correspond to the lower part of the Manganui Formation in Taranaki Basin. The third is the middle to late Miocene Whangamomona Group/megasequence, and the fourth is the latest Miocene-Pleistocene Rangitikei Supergroup/megasequence, both represented in the three basins. Higher order sequences (4th, 5th, 6th), having a eustatic origin, are evident in the Whangamomona and Rangitikei megasequences, particularly those of 5th order with 41 ka periodicity. The distribution of the megasequences are shown in a series of cross-section panels built-up from well -to-well correlations, complemented by time-stratigraphic cross-sections. The base of each megasequence is marked by marine flooding and represents a discrete phase in basin development. For the first megasequence this corresponded to rapid subsidence of the King Country Basin in a compressional setting and basement overthrusting on the Taranaki Fault, with the rapid introduction of terrigenous sediment during transgression. The Mahoenui megasequence accumulated mostly at bathyal depths; no regressive deposits are evident, having been eroded during subsequent uplift. The second (Mokau) megasequence accumulated during reverse movement on the Ohura Fault, formation of the Tarata Thrust Zone, and onlap of the basement block between the Taranaki Fault and the Patea-Tongaporutu-Herangi High (PTH). The Whangamomona megasequence accumulated during extensive reflooding of King Country Basin, onlap of the PTH High and of basement in the Wanganui Basin. This is an assymetrical sequence with a thin transgressive part (Otunui Formation) and a thick regressive part (Mount Messenger to Matemateaonga Formations). It represents the northward progradation of a continental margin wedge with bottom-set, slope-set and top-set components through Wanganui and King Country basins, with minor progradation over the PTH High and into Taranaki Basin. The Rangitikei megasequence is marked by extensive flooding at its base (Tangahoe Mudstone) and reflects the pull-down of the main Wanganui Basin depocentre. This megasequence comprises a second progradational margin wedge, which migrated on two fronts, one northward through Wanganui Basin and into King Country Basin, and a second west of the PTH High, through the Toru Trough and into the Central and Northern Grabens of Taranaki Basin and on to the Western Platform as the Giant Foresets Formation, thereby building up the modern shelf and slope.
机译：塔拉纳基盆地，旺加努伊盆地和金国盆地（以前是旺加努伊北部盆地）被认为是离散的盆地，但它们包含非常相似的新近纪沉积演替，并且它们的大部分地质历史是相同的。对每个盆地填充物的地层结构的分析揭示了构造起源的四个二阶巨型层序的发生。最古老的是早中新世（Otaian期）Mahoenui组/巨层序，其次是早中新世（Altonian期）Mokau组/巨层序（King Country Basin），两者均对应于Manganui组的下部在塔拉纳基盆地。第三个是中新世Whangamomona群/大序列的中晚期，第四个是最新的中新世-更新世Rangitikei超群/大序列，都在这三个盆地中代表。在旺格莫莫纳（Whangamomona）和兰吉蒂基（Rangitikei）巨序列中，尤其是具有41 ka周期性的5阶序列，具有较高的起源（第4，第5，第6）。兆序列的分布在一系列由井间相关性构建的横截面图中显示，并辅以时间地层横截面。每个巨型序列的底部都以海洋洪水为标志，代表着盆地发展的一个离散阶段。对于第一个超大序列，这对应于塔拉纳基断层在压缩环境和基底超推作用下国王乡村盆地的快速沉降，以及海侵过程中陆源沉积物的快速引入。 Mahoenui巨序列主要聚集在海床深处。在随后的隆升过程中，没有侵蚀性沉积物被侵蚀。第二个（Mokau）巨型序列在Ohura断层上逆向运动，塔拉塔逆冲带的形成以及塔拉纳基断层与Patea-Tongaporutu-Herangi高（PTH）之间的基底块重叠时积累。 Whangamomona巨型序列在King Country盆地，PTH High和Wanganui盆地的基底的大范围再驱替过程中积累。这是一个非对称序列，具有一个较薄的海侵部分（奥图努伊组）和一个较厚的逆向部分（马特玛提隆加组群的信使）。它代表着大陆边缘楔形物的北部向北扩展，穿过旺加努伊和金乡村盆地，并具有底部，倾斜和顶部组合，而在PTH高地和塔拉纳基盆地则略有扩展。 Rangitikei巨型序列在其底部（Tangahoe泥岩）泛滥成灾，反映了旺加努伊盆地主要沉积中心的拉低。这个巨大的序列包括第二个渐进的边缘楔形物，它在两个方面向北迁移，一个向北穿过旺格努伊盆地并进入金国盆地，而第二个向西迁移则位于PTH高地的第二个西部，穿过托鲁海槽并进入塔拉纳基盆地的中部和北部Grabens和进入西部平台，成为巨型前陆组，从而建立起现代的陆架和斜坡。

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