当前位置：
X-MOL 学术
›
Basin Res.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
High-frequency temporal variability of provenance signal in the submarine fan with the narrow shelf: Insights from sediment delivery and formation of late Triassic Zhuoni fan in the northeastern Paleo-Tethys Ocean
Basin Research ( IF 2.8 ) Pub Date : 2023-11-30 , DOI: 10.1111/bre.12835 Mingxuan Tan 1 , Haonan Sun 1 , Yilin Fu 1 , Haonan Cui 1, 2 , Chengcheng Zhang 3
Basin Research ( IF 2.8 ) Pub Date : 2023-11-30 , DOI: 10.1111/bre.12835 Mingxuan Tan 1 , Haonan Sun 1 , Yilin Fu 1 , Haonan Cui 1, 2 , Chengcheng Zhang 3
Affiliation
|
The submarine fan with a narrow shelf is usually reactive to environmental signal propagation; however, source-to-sink functioning can be further complicated by several allogenic forcings. Here, we document the high-frequency provenance variations and different sediment delivery models recorded in the late Triassic Zhuoni fan developed in the northeastern Paleo-Tethys Ocean, mainly based on process-based sedimentological and provenance study of the Panyuan section in the West Qinling area in the northeastern margin of Tibetan Plateau. High-, low-density turbidites, hybrid event beds and hyperpycnites are distributed in the lobe-dominated submarine fan succession. Field sedimentological evidence from surrounding outcrops suggests that shelf-edge failure was the main cause of most high- and low-density turbidites with the overall absence of submarine slides or slumps, whereas the narrow shelf configuration together with late Triassic humid pulses is favourable for the occurrence of flood-related hyperpycnites in the Zhuoni fan. Detrital zircon grains (N = 6; n = 123–272) generally have Palaeozoic-Mesozoic ages (ca. 350–250 Ma and 500–400 Ma) and Neoarchean-Paleoproterozoic ages (ca. 2100–1750 Ma and 2600–2400 Ma), but they can be further categized into three age groups due to different proportions of Precambrian age populations. The results demonstrate that the potential source areas may include the South and North Qinling Orogenic Belt, Qilian Orogenic Belt, different segments of North China Craton and the tectonic junction area between the Qinling and Qilian Orogenic Belts. The temporal changes in provenance signals, which are reflected by both the detrital zircon age spectra and heavy mineral assemblages, indicate different contributions of those sources in response to sea-level fluctuation. It could thus give rise to temporal variations between reactive and buffered source-to-sink sediment delivery models of the Zhuoni fan, despite the overall narrow shelf configuration. The development of the lowstand Zhuoni fan was directly related to extrabasinal hyperpycnal delivery from the river mouth and its high-frequency provenance variability recorded different efficiencies of signal transfer through the onshore catchment with significantly influence of temporal storage, fluvial rejuvenation or even regional climate variability. The highstand submarine fan was thought to be formed by shelf-edge failure with sediment buffering in the shelf region, which was associated with a strong magnitude of provenance mixing. Our work provides a new perspective for deciphering the different origins of deep-water sediment delivery in response to high-frequency sea-level and climate changes.
中文翻译：
窄陆架海底扇物源信号的高频时间变化：古特提斯洋东北部晚三叠世卓尼扇沉积物输送和形成的见解
具有狭窄架子的潜艇风扇通常对环境信号传播有反应；然而，源-库功能可能因几种同种异体强迫而进一步复杂化。本文主要基于西秦岭地区盘源剖面的过程沉积学和物源研究，记录了古特提斯洋东北部发育的晚三叠世卓尼扇的高频物源变化和不同的沉积输送模式。位于青藏高原东北缘。高、低密度浊积岩、混合事件层和异重岩分布在以叶瓣为主的海底扇序列中。周围露头的现场沉积学证据表明，陆架边缘的破坏是大多数高密度和低密度浊积岩的主要原因，总体上不存在海底滑坡或塌陷，而狭窄的陆架结构和晚三叠世的潮湿脉冲有利于沉积物的形成。卓尼扇内出现与洪水相关的异重岩。碎屑锆石颗粒（N =6；n =123-272）一般有古生代-中生代年龄（约350-250Ma和500-400Ma）和新太古代-古元古代年龄（约2100-1750Ma和2600-2400Ma） ），但由于前寒武纪年龄人口比例不同，可进一步分为三个年龄组。结果表明，潜在的物源区可能包括南、北秦岭造山带、祁连造山带、华北克拉通不同区段以及秦岭与祁连造山带的构造结合部。碎屑锆石年龄谱和重矿物组合反映的物源信号的时间变化表明这些来源对海平面波动的不同贡献。因此，尽管整体陆架结构狭窄，但它可能会导致卓尼扇的反应性和缓冲源-汇沉积物输送模型之间的时间变化。低位卓尼扇的发育与河口的盆外异重传递直接相关，其高频物源变异记录了通过陆上流域的不同信号传递效率，对时间储存、河流更新甚至区域气候变化具有显着影响。高位海底扇被认为是由陆架边缘破坏和陆架区域沉积物缓冲形成的，这与强烈的物源混合有关。我们的工作为破译深水沉积物输送响应高频海平面和气候变化的不同起源提供了新的视角。
更新日期：2023-11-30
中文翻译：
窄陆架海底扇物源信号的高频时间变化：古特提斯洋东北部晚三叠世卓尼扇沉积物输送和形成的见解
具有狭窄架子的潜艇风扇通常对环境信号传播有反应；然而，源-库功能可能因几种同种异体强迫而进一步复杂化。本文主要基于西秦岭地区盘源剖面的过程沉积学和物源研究，记录了古特提斯洋东北部发育的晚三叠世卓尼扇的高频物源变化和不同的沉积输送模式。位于青藏高原东北缘。高、低密度浊积岩、混合事件层和异重岩分布在以叶瓣为主的海底扇序列中。周围露头的现场沉积学证据表明，陆架边缘的破坏是大多数高密度和低密度浊积岩的主要原因，总体上不存在海底滑坡或塌陷，而狭窄的陆架结构和晚三叠世的潮湿脉冲有利于沉积物的形成。卓尼扇内出现与洪水相关的异重岩。碎屑锆石颗粒（N =6；n =123-272）一般有古生代-中生代年龄（约350-250Ma和500-400Ma）和新太古代-古元古代年龄（约2100-1750Ma和2600-2400Ma） ），但由于前寒武纪年龄人口比例不同，可进一步分为三个年龄组。结果表明，潜在的物源区可能包括南、北秦岭造山带、祁连造山带、华北克拉通不同区段以及秦岭与祁连造山带的构造结合部。碎屑锆石年龄谱和重矿物组合反映的物源信号的时间变化表明这些来源对海平面波动的不同贡献。因此，尽管整体陆架结构狭窄，但它可能会导致卓尼扇的反应性和缓冲源-汇沉积物输送模型之间的时间变化。低位卓尼扇的发育与河口的盆外异重传递直接相关，其高频物源变异记录了通过陆上流域的不同信号传递效率，对时间储存、河流更新甚至区域气候变化具有显着影响。高位海底扇被认为是由陆架边缘破坏和陆架区域沉积物缓冲形成的，这与强烈的物源混合有关。我们的工作为破译深水沉积物输送响应高频海平面和气候变化的不同起源提供了新的视角。
京公网安备 11010802027423号