中国南部埃迪卡拉-寒武系界线附近k -膨润土的成因

IF 3.6 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Zongling Zhang , Mingzhong Zhou , Li Zhou , Di Zhang , Xixi Xue , Zhuo Wu , Zhongfa Zhou , Enlin Yang , Qing Wang , Jack Longman , Haifeng Fan
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引用次数: 0

摘要

了解在环境变化和进化发展时期火山物质的起源可能有助于研究变化与火山活动之间的因果关系。埃迪卡拉纪-寒武纪边界(ECB)就是这样一个有趣的环境变化时期,它发生在埃迪卡拉纪动物群出现之后,在寒武纪大爆发之前。近年来,由于年代学的发展,在华南地层中发现了一些ECB时代的k -膨润土,但尚未对其成因进行系统的研究。本文对中国南方梅树村朱家青组中期和平阴市刘坡坡组最上部的ecb年龄k -膨润土进行了矿物学、全岩和锆石地球化学研究,探讨了k -膨润土的成因。全岩主微量元素和k -膨润土中火山锆石的微量元素数据表明,源岩浆为长英质岩浆,而火山锆石的hf同位素组成表明,主要源岩浆可能来源于枯竭的地幔,古地壳物质的贡献较小。k -膨润土中火山锆石的全岩和微量元素数据进一步表明,源火山位于与俯冲有关的构造环境中。结合前人对冈瓦纳构造的研究,我们认为火山源很可能位于冈瓦纳西北缘原特提斯洋壳向伊朗地体俯冲形成的岩浆弧环境中。因此,k -膨长岩代表了埃迪卡拉-寒武纪过渡时期冈瓦纳西北边缘强烈的长英质爆炸性火山活动的片段,并可能被运送到1000公里外的研究地点。在整个地球历史上,大规模的长英质爆炸性火山活动在影响大气和海洋环境方面发挥了重要作用,这里记录的火山活动与世界其他地方的火山活动是同时期的。这种活动与埃迪卡拉纪-寒武纪过渡期间剧烈的环境波动和早期生命进化的转换之间的紧密时间联系,使我们提出火山作用可能在欧洲央行的环境和进化事件中发挥了作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Origin of K-bentonites near the Ediacaran-Cambrian boundary in South China
Understanding the origin of volcanic material at times of environmental change and evolutionary development may help aid investigation of causal linkages between the changes and volcanic activity. One such episode of environmental change of interest is the Ediacaran-Cambrian boundary (ECB), which follows the emergence of the Ediacaran fauna, and precedes the Cambrian explosion. Owing to recent developments in geochronology, a number of K-bentonites of ECB age have been identified in strata from South China, but systematic research on their origin has not been performed. Here, we carried out mineralogical, whole-rock, and zircon geochemical studies on ECB-age K-bentonites from the middle Zhujiaqing Formation at Meishucun and the topmost Liuchapo Formation at Pingyin in South China to investigate the origin of the K-bentonites. Whole-rock major- and trace-element data, and trace-element data of volcanic zircons in the K-bentonites indicate the source magmas are felsic, whilst Hf-isotope compositions of the volcanic zircons indicate the primary source magmas likely originated from the depleted mantle, with a minor contribution of ancient crustal material. Whole-rock data and trace-element data of volcanic zircons in the K-bentonites further indicate the source volcanoes were located in a subduction-related tectonic setting. By combining our findings with previous studies of Gondwanan tectonics, we suggest the source volcanoes were most probably located in a magmatic arc setting formed by subduction of the Proto-Tethys oceanic crust towards the Iran terrane in the northwestern margin of Gondwana. Thus, the K-bentonites represent episodes of intense felsic explosive volcanism along the northwestern margin of Gondwana during the Ediacaran-Cambrian transition and have likely been transported 1000 km to the studied sites. Large-scale felsic explosive volcanism played an important role in influencing the atmospheric and oceanic environments throughout Earth's history, and the volcanic activity documented here is contemporaneous with eruptions elsewhere in the world. The tight temporal link between this activity and the dramatic environmental fluctuations and the turnover of early life evolution during the Ediacaran-Cambrian transition, leads us to propose that volcanism may have played a role in the environmental and evolutionary events of the ECB.
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来源期刊
Chemical Geology
Chemical Geology 地学-地球化学与地球物理
CiteScore
7.20
自引率
10.30%
发文量
374
审稿时长
3.6 months
期刊介绍: Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.
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