Ediacaran diamictite deposition in South China: Detrital zircon u-pb age evidence and macro sedimentary texture of the Aiqiling formation in southeastern Hunan Province

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2024-10-01 DOI:10.1016/j.precamres.2024.107580

Fang Song , Yaoyan He , Zhijun Niu , John Menzies , Wenqiang Yang , Zhihui An , Zhihong Wang

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Abstract

A better understanding of Ediacaran (Gaskiers) glaciations, including their ages, global distribution and types, is critical to our understanding of the Earth’s evolution following the Neoproterozoic “Snowball Earth”. The present study focuses on a diamictite that forms part of a continuous succession of Neoproterozoic clastic sedimentary rocks in the northwestern margin of the Cathaysia block in South China. Detailed sedimentary sequence established here shows that the diamictite, previously interpreted to be Cryogenian in age, is a part of the Ediacaran Aiqiling Formation. Detrital zircon U-Pb ages constrain its maximum deposition age to ca. 571 Ma, supporting its Ediacaran age. The macro sedimentary textures of the diamictite unit, including matrix-supported sediments with angular and randomly distributed clasts, combined with regional geochemical results, suggest a glaciogenic origin. The U-Pb detrital zircon age data also indicate an uplifting source area to the southeast that migrated northwestward since the Ediacaran.

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华南地区埃迪卡拉纪二迭纪沉积：湖南省东南部艾其岭地层的锆英石u-pb年龄证据和宏观沉积纹理

更好地了解埃迪卡拉（加基尔）冰川，包括其年龄、全球分布和类型，对于我们了解新近纪 "雪球地球 "之后的地球演化至关重要。本研究的重点是华南国泰地块西北边缘新元古代碎屑沉积岩连续演替中的一个二迭岩。所建立的详细沉积序列表明，以前被解释为冷新生代的二长岩是埃迪卡拉纪艾奇岭地层的一部分。碎屑锆石U-Pb年龄将其最大沉积年龄推定为约571Ma，支持了其埃迪卡拉纪年龄。二迭石单元的宏观沉积纹理（包括带有角状和随机分布的碎屑的基质支撑沉积物）与区域地球化学结果相结合，表明其起源于冰川。U-Pb 铁锆石年龄数据也表明，自埃迪加拉纪以来，东南部是一个向西北迁移的隆起源区。

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来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.