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Lithofacies, paleoenvironments and elements of sequence architecture, Late Oligocene - earliest Miocene Castle Craig Subgroup (Te Kuiti Group), Waikato-King Country Basin, New Zealand

机译:岩相,古环境和层序构造要素,晚渐新世-最早的中新世城堡克雷格小组(Te Kuiti集团),新西兰怀卡托-金国家盆地

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摘要

This report presents a comprehensive facies and sequence stratigraphic analysis of the Late Oligocene Castle Craig Subgroup (Orahiri Formation and Otorohanga Limestone) within the Late Eocene – Earliest Miocene Te Kuiti Group in the Waikato-King Country Basin in central-western North Island, New Zealand. Detailed field investigations have identified 12 lithofacies within the Castle Craig Subgroup, which have been grouped into three lithofacies associations named limestone, mixed carbonate-siliciclastic sandstone, and siliciclastic sandstone after the dominant lithologies. In areas south of Aotea Harbour the subgroup comprises a wide variety of limestone types with variable siliciclastic content, dominated by coarse skeletal rudstone/grainstone, with aggregate stratigraphic thicknesses of up to 100 m. These sediments accumulated at shelf depths in a moderate to highenergy tidal seaway. Around Raglan Harbour and in areas to the north, the subgroup comprises predominantly planktic foraminiferal-rich packstone to wackestone and calcareous siltstone/marl that accumulated mainly in slope/upper bathyal settings.
机译:本报告提供了晚始新世内晚渐新世城堡克雷格亚组(Orahiri组和Otorohanga石灰岩)的全面相和层序地层分析–新西兰北岛中西部怀卡托-金国家盆地的最早中新世Te Kuiti组。详细的现场调查已确定了Castle Craig子组内的12个岩相,根据主要岩性将其分为三个岩相协会,命名为石灰岩,碳酸盐-硅质碎屑混合砂岩和硅质碎屑砂岩。在Aotea港以南的地区,该亚组包括各种硅质碎屑含量不同的石灰岩类型,主要为粗骨质ruststone / grainstone,总地层厚度最高为100 m。这些沉积物在中度至高能的潮汐航道中的架子深度处积累。在拉格伦港周围和北部地区,该亚群主要是富含板状有孔虫的堆积岩,以瓦克石和钙质粉砂岩/泥灰岩为主,主要堆积在斜坡/上沉积环境中。

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