Late Tonian (ca. 770-720 Ma) arc activity in the Wuyi domain of the West Cathaysia terrane, South China

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2024-07-05 DOI:10.1016/j.precamres.2024.107505

Huan Liu , Lijun Wang , Shoufa Lin , Xilin Zhao

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引用次数: 0

Abstract

The late Tonian tectonic setting of the West Cathaysia terrane in South China is highly controversial and is key to better understanding the timing of amalgamation between the Yangtze Block and the West Cathaysia terrane and the positions of these two terranes in Rodinia and Gondwana. A detailed field-based study was conducted on the petrology, zircon U-Pb geochronology and Lu-Hf isotopes, and whole-rock geochemistry of a series of Neoproterozoic meta-volcanic and meta-sedimentary rocks in the Wuyi domain in the northeastern West Cathaysia terrane. The results indicate that the meta-volcanic rocks formed in an arc setting at 756-740 Ma, and the meta-sedimentary rocks were developed in an arc-related basin with single zircon age peaks of 765-728 Ma. We propose that the late Tonian arc in the Wuyi domain was part of a major arc system in the West Cathaysia terrane. An arc setting for the West Cathaysia terrane is distinct from the continental rift setting for the southeastern margin of the Yangtze Block at the time, supporting an interpretation that the two terranes were not amalgamated until after the late Tonian and occupied separate positions in Rodinia.

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华南西华夏地层武夷域的晚砺石期（约 770-720 Ma）弧活动

华南西国泰地层的晚砺石期构造背景极具争议，它是更好地理解长江地块与西国泰地层的混杂时间以及这两个地层在罗迪尼亚和冈瓦纳的位置的关键。该研究以野外为基础，对国泰西地层东北部武夷域一系列新新生代元火山岩和元沉积岩的岩石学、锆石U-Pb地质年代学和Lu-Hf同位素以及全岩地球化学进行了详细研究。结果表明，元火山岩形成于756-740Ma的弧环境中，元沉积岩则发育于与弧有关的盆地中，锆石年龄峰值为765-728Ma。我们认为武夷山域的晚砺石期弧系是西国泰地层中主要弧系的一部分。西国泰阶地的弧形环境与当时扬子地块东南缘的大陆裂谷环境截然不同，支持这两个阶地直到晚通年之后才合并并在罗迪尼亚占据不同位置的解释。

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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.