Origin and evolution of the Paleo-Kuril arc inferred from detrital zircon U–Pb chronology in eastern Hokkaido, NE Asia

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2022-08-27 DOI:10.1111/iar.12458
Futoshi Nanayama, Toru Yamasaki, Toshiya Kanamatsu, Hideki Iwano, Tohru Danhara, Takafumi Hirata
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引用次数: 0

Abstract

The Nemuro and Saroma Groups and Yusenkyo Formation occur in eastern Hokkaido and are considered to be forearc or intra-arc basin sediments of the Paleo-Kuril arc (PKA) deposited during the Late Cretaceous to middle Eocene. To further clarify the origin of the PKA, we examined the U–Pb ages of detrital zircons within these sandstones and acidic tuff beds; based on our results, we drew the following conclusions. (1) The PKA originated from an oceanic island arc on the oceanic Izanagi Plate around 85 Ma, to which the Nikoro Group greenstone complex was accreted between 81–80 Ma; the Lowest Unit of the Saroma Group covered the surface of the Nikoro accretional greenstone complex. (2) The PKA then first collided with NE Asia around the beginning of the deposition of the Hamanaka Formation (~70 Ma) and transitioned to a continental arc adjacent to NE Asia. This collision generated giant slump beds during deposition of the Akkeshi Formation. During deposition of the Kiritappu Formation, the entire Nemuro Peninsula was uplifted, supplying large volumes of clastic sediments. (3) Although we do not have data directly bearing on why the North American Plate was established in the edge of NE Asia, we speculate that it separated from the Eurasian continent around ~70 Ma when NE Asia first collided with the PKA. Subsequently, the PKA has behaved as part of the North American Plate. The Paleo-Japan arc (or East Sikhote–Alin arc) and the PKA became joined via the Hidaka Belt. Around 40 Ma, during the deposition of coarse conglomerate beds of the Urahoro Group, the PKA was uplifted and bent clockwise due to a second collision with NE Asia. (4) The modern Kuril arc was established around 36 Ma (late Eocene–early Oligocene), and the Kuril backarc basin opened into the present tectonic setting in the late Oligocene–early Miocene.

东北亚北海道东部碎屑锆石U–Pb年代学推断的古千岛弧的起源和演化
Nemuro组和Saroma组及Yusenkyo组产于北海道东部,被认为是晚白垩世至中始新世沉积的古千岛弧(PKA)的弧前或弧内盆地沉积。为了进一步明确PKA的成因,我们研究了这些砂岩和酸性凝灰岩层中碎屑锆石的U-Pb年龄;根据我们的研究结果,我们得出了以下结论。(1) PKA起源于85 Ma左右的伊扎那吉板块洋岛弧,81 ~ 80 Ma之间Nikoro群绿岩杂岩增生于此;Saroma组的最低单元覆盖了Nikoro增生绿岩复合体的表面。(2)在滨中组沉积初期(~70 Ma), PKA首次与东北亚发生碰撞,并转变为与东北亚相邻的大陆弧。这次碰撞在阿克什组沉积期间产生了巨大的滑塌层。Kiritappu组沉积期间,整个Nemuro半岛隆起,提供了大量碎屑沉积物。(3)虽然我们没有资料直接说明北美板块为何在东北亚边缘形成,但我们推测北美板块是在约70 Ma的时候从欧亚大陆分离出来的。随后,PKA表现为北美板块的一部分。古日本弧(或东锡霍特-阿林弧)和PKA通过Hidaka带连接在一起。40 Ma左右,在乌拉霍罗群粗砾岩层沉积期间,由于与东北亚的第二次碰撞,PKA被抬高并顺时针弯曲。(4)现代千岛弧大约建立于36 Ma(晚始新世—早渐新世),千岛弧后盆地在晚渐新世—中新世早期进入现今的构造环境。
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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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