日本北北带白谷岬上三叠统碳酸盐岩的沉积学和生物地层学

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2022-11-16 DOI:10.1111/iar.12473
Giovan Peyrotty, Andrea Fucelli, Camille Peybernes, Tetsuji Onoue, Hayato Ueda, Rossana Martini
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引用次数: 0

摘要

泛海的遗迹今天出现在整个环太平洋地区的增生复合体和地质体中。其中,浅水碳酸盐岩系统的遗迹提供了有关这片广阔海洋中盛行的生态和环境条件的宝贵信息。在这方面,北北上带的志谷角(日本本州岛青森县)是一个重要的研究地点。该海角的特点是在典型的增生岩中嵌有大量石灰岩矿床,包括多公里厚的块状板块和米制层状矿床,它确实是泛海盆地碳酸盐沉积的重要遗迹。首次对施里亚角的所有石灰岩露头进行了取样和详细研究。尽管总体上保存较差,但仍确定了宏观沉积特征,如洞穴和大型巨齿鲨斑块以及四种微相,并在本工作中进行了详细介绍。根据有孔虫和牙形刺生物地层学,确定石灰岩矿床的年龄为诺里期。与Panthalassan和Tethyan领域的类似和同步系统的相似性被广泛讨论。与Shiriya灰岩最相似的是Panthalassan Dalnegorsk灰岩(俄罗斯远东地区),无论是微相还是沉积背景。在希里亚角也发现了类似于特提斯同步系统中著名的lofer旋回的沉积序列。随着巨大的石灰岩板块,无数含石灰岩的砾岩也出现在希里亚角。他们的研究和与日本类似沉积物的比较突出了他们对了解中大洋碳酸盐解体的重要性。通过与已知碳酸盐岩体系的观察和比较,建立了一个假设的Shiriya灰岩沉积模型,该模型对应于在浸没火山海底山上发育的Norian孤立碳酸盐岩体系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sedimentology and biostratigraphy of the upper Triassic carbonates from the Shiriya cape, North Kitakami Belt, Japan

Sedimentology and biostratigraphy of the upper Triassic carbonates from the Shiriya cape, North Kitakami Belt, Japan

Relics of the Panthalassa Ocean occur today in accretionary complexes and terranes on the entire Circum-Pacific region. Among them, remains of shallow-water carbonate systems provide valuable information about the ecology and environmental conditions that prevailed in this immense ocean. In this regard, the Shiriya Cape of the North Kitakami Belt (Aomori Prefecture, Honshu Island, Japan) is an essential place to study. Characterized by the presence of numerous limestone deposits embedded in typical accretionary mélange, including pluri-kilometric massive slabs and metric bedded deposits, the cape is indeed a key vestige of carbonate deposition in the Panthalassa. All the limestone outcrop form the Shiriya Cape were sampled and studied in detail for the first time. Despite a general poor preservation, macroscopic sedimentary features such as burrows and large megalodontids patches as well as four microfacies were identified and are presented in detail in this work. On the basis of foraminifers and conodonts biostratigraphy, the age of the limestone deposits is defined as Norian. Similarities with analogous and synchronous systems from Panthalassan and Tethyan realms are extensively discussed. The closest analog to the Shiriya limestone appears to be the Panthalassan Dalnegorsk limestone (Russian Far East), both regarding microfacies and depositional setting. Sedimentary successions similar to Lofer-cycles, well known in Tethyan synchronous systems, were also discovered in the Shiriya Cape. Along with the large limestone slabs, countless limestone-bearing conglomerates also crop out on the Shiriya Cape. Their study and comparison with similar deposits in Japan highlighted their importance in the understanding of the dismantling of mid-oceanic carbonates. The observations and comparison with well-known carbonate systems permitted to establish a hypothetical depositional model of the Shiriya limestone corresponding to a Norian isolated carbonate system developed on an immerged volcanic seamount.

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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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