Trace-element composition of zircon in Kofu and Tanzawa granitoids, Japan: Quantitative indicator of sediment incorporated in parent magma

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Island Arc Pub Date : 2022-07-15 DOI:10.1111/iar.12455
Yusuke Sawaki, Hisashi Asanuma, Shuhei Sakata, Mariko Abe, Takeshi Ohno
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引用次数: 1

Abstract

Zircon is one of the most important minerals in geochronologic research. Isotopic ratios and trace elements in zircons are expected to reflect those of their parent magmas. Many geochemical researchers have proposed various discrimination diagrams for zircon to indicate tectonic setting and to identify source rock. Because most detrital zircons accumulated at river mouths are derived primarily from granitoids, the classification of zircon within granitoids is potentially meaningful. In our research, we focused on sediment involvement during granitoid formation and tried to identify trace-element compositions in zircon that are sensitive to variation in sediment incorporation. To accomplish this, we examined trace-element compositions of both the granitoids and the included zircons in the Kofu granitic complex and the Tanzawa tonalitic plutons in Japan. Among the high-field-strength elements (Th, U, Ta, Nb, Hf, and rare earth elements), only Nb and Ta concentrations in the granitoids increased as the rate of sediment contribution increased. However, the zircon did not show such trends in Nb and Ta content. Zircon Y and P contents exhibited a positive correlation, indicating that xenotime substitution occurs to some extent. Because P exists as pentavalent ions in igneous systems, its presence likely affects the concentrations of pentads in zircon. When we divided the Nb and Ta contents by the P content, it became clear that zircon Nb/P and Ta/P ratios increase depending on sediment involvement. While some exceptions exist, we found that zircon Yb/Gd ratios also respond to sediment involvement. Our data further demonstrated that zircons in granitoids with significant sediment incorporation are characterized by low Ce/P contents, which is partly attributable to monazite crystallization before zircon saturation. This study demonstrates that combining these element ratios is useful for indicating sediment incorporation.

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日本Kofu和Tanzawa花岗质岩石中锆石的微量元素组成:母岩浆中沉积物的定量指标
锆石是地质年代学研究中最重要的矿物之一。锆石中的同位素比率和微量元素预计将反映其母岩浆的同位素比率。许多地球化学研究人员提出了各种锆石判别图来指示构造背景和识别烃源岩。由于河口堆积的大多数碎屑锆石主要来源于花岗岩类,因此在花岗岩类中对锆石进行分类具有潜在意义。在我们的研究中,我们专注于花岗岩类形成过程中的沉积物参与,并试图确定锆石中对沉积物掺入变化敏感的微量元素成分。为了实现这一点,我们检查了日本高富花岗质杂岩体和田泽英云闪长岩深成岩体中的花岗质岩石和包含的锆石的微量元素组成。在高场强元素(Th、U、Ta、Nb、Hf和稀土元素)中,只有Nb和Ta在花岗质岩石中的浓度随着沉积物贡献率的增加而增加。然而,锆石在Nb和Ta含量方面没有显示出这样的趋势。锆石Y和P含量呈正相关,表明在一定程度上发生了异时体取代。由于磷在火成岩系统中是以五价离子的形式存在的,它的存在可能会影响锆石中五价元素的浓度。当我们将Nb和Ta含量除以P含量时,很明显锆石Nb/P和Ta/P的比率随着沉积物的参与而增加。虽然存在一些例外,但我们发现锆石Yb/Gd比率也对沉积物的参与有反应。我们的数据进一步表明,具有显著沉积物掺入的花岗岩中的锆石具有低Ce/P含量的特征,这在一定程度上可归因于锆石饱和前的独居石结晶。这项研究表明,结合这些元素比例有助于指示沉积物的掺入。
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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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