An arc terrane separated from the Yangtze Craton during Rodinia breakup: Insights from Neoproterozoic sedimentary successions of the Erguna Block, Northeast China

IF 3.2 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Precambrian Research Pub Date : 2024-07-03 DOI:10.1016/j.precamres.2024.107497
Ke Wang , Yilong Li , Wenjiao Xiao , Haitian Zhang , Guoqing Wang , Jianping Zheng , Xiujuan Bai , Guang Yang , Guohui Zhang , Fraukje M. Brouwer
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Abstract

The Central Asian Orogenic Belt (CAOB) is one of the largest and most complex accretionary systems and is responsible for considerable Phanerozoic juvenile crustal growth. The Erguna Block is a Precambrian microcontinent located in the eastern part of the CAOB. Controversy has long surrounded the origin and tectonic affinity of the Erguna Block, limiting reconstruction of its position in the supercontinent Rodinia. This study presents a systematic study of the petrology, whole-rock geochemistry and zircon U-Pb-Hf isotopes of metasedimentary rocks from the Ergunahe Formation, the Jiageda Formation and the Xinghuadukou Group, which are the oldest units in the Erguna Block. The samples from the Ergunahe Formation comprise phyllite and schist with detrital zircon ages of 2476–743 Ma, maximum protoliths depositional ages of 817–743 Ma and peaks at 763 Ma, 896 Ma and 1162 Ma, εHf(t) values of −15.54 to +11.66 and TDM2 model ages of 3464–978 Ma. The Jiageda Formation samples include metasandstone, metapelite and schist with detrital zircon ages of 2976–766 Ma, maximum protoliths depositional ages of 837–766 Ma and peaks at 776 Ma, 843 Ma, 918 Ma and 984 Ma, εHf(t) values of −9.46 to +14.68 and TDM2 model ages of 3207–866 Ma. From the Xinghuadukou Group, schists are studied with detrital zircon ages of 2908–785 Ma, maximum protoliths depositional ages of 839–785 Ma and peaks at 837 Ma and 907 Ma, εHf(t) values of −14.35 to +12.68 and TDM2 model ages of 3949–926 Ma. The protoliths of the metasedimentary rocks from the three groups have similar depositional age spans and source rocks. They are mainly siltstones and greywackes and represent a sedimentary sequence in a continental arc-related basin. The source rocks for the protoliths were mainly arc magmatic rocks in the Erguna Block, which were formed in a continental arc as oceanic lithosphere subducted during the assembly and break-up of the Rodinia supercontinent. Combined with existing data, the age spectrum and multidimensional scaling (MDS) analysis of detrital zircon indicate the Erguna Block originated from a continental arc at the margin of the Yangtze Craton. Long-term subduction at ca. 963–737 Ma accompanied by back-arc extension during ca. 904–737 Ma led to rifting of the Erguna Block off the Yangtze Craton. Neoproterozoic sedimentary rock assemblages from the Erguna Block were deposited in a large-scale long-term trench-arc-basin system that formed in front of the Yangtze Craton, along the northwest margin of Rodinia.

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在罗迪尼亚断裂过程中从长江克拉通分离出来的弧形陆相:中国东北额尔古纳地块新近新生代沉积演替的启示
中亚造山带(CAOB)是最大、最复杂的增生系统之一,是新生代幼年地壳生长的重要原因。额尔古纳地块是位于中亚造山带东部的前寒武纪微大陆。长期以来,围绕额尔古纳地块的起源和构造亲缘关系一直存在争议,限制了对其在罗迪尼亚超大陆中位置的重建。本研究对额尔古纳地块最古老的单元--额尔古纳河地层、嘉格达地层和杏花渡口组的变质岩的岩石学、全岩地球化学和锆石U-Pb-Hf同位素进行了系统研究。额尔古纳河地层样品包括辉绿岩和片岩,其锆英石碎片年龄为2476-743Ma,原岩最大沉积年龄为817-743Ma,峰值分别为763Ma、896Ma和1162Ma,εHf(t)值为-15.54至+11.66,TDM2模型年龄为3464-978Ma。佳格达地层样品包括元砂岩、玄武岩和片岩,锆英石碎片年龄为2976-766 Ma,原岩最大沉积年龄为837-766 Ma,峰值分别为776 Ma、843 Ma、918 Ma和984 Ma,εHf(t)值为-9.46至+14.68,TDM2模型年龄为3207-866 Ma。在杏花渡口组研究了片岩,其锆英石碎片年龄为2908-785 Ma,最大原岩沉积年龄为839-785 Ma,峰值为837 Ma和907 Ma,εHf(t)值为-14.35至+12.68,TDM2模型年龄为3949-926 Ma。三个组的变质岩的原岩具有相似的沉积年龄跨度和来源岩。它们主要是粉砂岩和灰岩,代表了大陆弧相关盆地的沉积序列。原岩的来源岩石主要是额尔古纳地块的弧岩浆岩,这些岩石是在罗迪尼亚超大陆组装和解体过程中海洋岩石圈俯冲到大陆弧中形成的。结合现有数据,碎屑锆石的年龄谱和多维尺度(MDS)分析表明额尔古纳地块起源于长江克拉通边缘的大陆弧。大约在963-737Ma的长期俯冲过程中约963-737Ma期间的长期俯冲,以及约904-737Ma期间的弧后延伸,导致额尔古纳地块脱离长江克拉通。来自额尔古纳地块的新近新生代沉积岩组合沉积在长江克拉通前沿罗迪尼亚西北边缘形成的大规模长期海沟-弧-盆地系统中。
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来源期刊
Precambrian Research
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.
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