A Paleogene magmatic overprint on Cretaceous seamounts of the western Pacific

A Paleogene magmatic overprint on Cretaceous seamounts of the western Pacific
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西太平洋白垩纪海山上的古近纪岩浆叠印

DOI:
10.1111/iar.12386
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发表时间:
2021
期刊:
影响因子:
1.5
通讯作者:
Ishii Teruaki
Ishii Teruaki
中科院分区:
地球科学4区
文献类型:
--
作者:
Hirano Naoto;Sumino Hirochika;Morishita Taisei;Machida Shiki;Kawano Takaomi;Yasukawa Kazutaka;Hirata Takafumi;Kato Yasuhiro;Ishii Teruaki

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西太平洋海山省(WPSP)代表了一系列短暂的白垩纪热点轨迹。然而,在西太平洋板块形成后,在海沟附近爆发的小斑点火山活动之前,没有发现板内火山。这项研究报告了西太平洋北方古近纪火山机构的新年龄,特别是小笠原高原和相关的山脊,以及南鸟岛。这些古近纪年龄是首次报告的西太平洋海山玄武岩,在一个地区,以前只产生白垩纪的年龄。新发现的古近纪火山活动覆盖在早-中白垩世火山大厦之上,因为这些大厦上的海山或古岛屿物质覆盖的礁灰岩盖都比本研究中确定的古近纪火山活动更古老。这项研究概述了几个可能的成因因素,古近纪火山作用叠加到现有的白垩纪海山,包括火山活动有关的岩石圈应力,或一个年轻的热点轨道内的北方部分的西太平洋板块,记录岩浆活动从~60 Ma。
The West Pacific Seamount Province (WPSP) represents a series of short‐lived Cretaceous hotspot tracks. However, no intraplate volcanoes in advance of petit‐spot volcanism erupted near a trench have been identified after the formation of the WPSP on the western Pacific Plate. This study reports new ages for Paleogene volcanic edifices within the northern WPSP, specifically the Ogasawara Plateau and related ridges, and Minamitorishima Island. These Paleogene ages are the first reported for basaltic rocks on western Pacific seamounts, in an area that has previously only yielded Cretaceous ages. The newly found Paleogene volcanisms overprint the Early–middle Cretaceous volcanic edifices, because the seamount or paleo‐island material‐covered reefal limestone caps on these edifices are uniformly older than the Paleogene volcanism identified in this study. This study outlines several possible causative factors for the Paleogene volcanism overprinting onto existing Cretaceous seamounts, including volcanism related to lithospheric stress, or a younger hotspot track within the northern part of the WPSP that records magmatism from ~60 Ma.
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