扬子地块西南部中元古代晚期与弧相关的花岗岩类岩浆活动：岩石成因及其地球动力学意义

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-02-01 DOI:10.1016/j.precamres.2024.107635

Mingda Huang , Xiaozhuang Cui , Guangming Ren , Qi Deng , Fenglin Chen , Junwei Yang , Tao Li , Zhiming Sun

{"title":"扬子地块西南部中元古代晚期与弧相关的花岗岩类岩浆活动：岩石成因及其地球动力学意义","authors":"Mingda Huang , Xiaozhuang Cui , Guangming Ren , Qi Deng , Fenglin Chen , Junwei Yang , Tao Li , Zhiming Sun","doi":"10.1016/j.precamres.2024.107635","DOIUrl":null,"url":null,"abstract":"<div><div>The geodynamic setting of the southwestern Yangtze Block in the latest Mesoproterozoic has been a controversial issue for decades, which confuses the relationship between the Yangtze Block and the assembly of Rodinia supercontinent. We here report an integrated dataset of petrology, whole-rock geochemistry, zircon U-Pb ages and Hf isotopes for the newly identified latest Mesoproterozoic granitoids from the Yonglang area, southwestern Yangtze Block. SHRIMP and LA-ICP-MS zircon U-Pb dating results suggest that these granitoids were mainly crystallized at ca. 1.02 Ga. These samples show typical geochemical signatures of I-type granite, such as negative correlation between P<sub>2</sub>O<sub>5</sub> and SiO<sub>2</sub> contents, positive correlation between A/CNK ratios and SiO<sub>2</sub> contents, and zirconium saturation temperature (<em>T</em><sub>zr</sub>) of 748–818 °C. Their zircon ε<sub>Hf</sub>(t) values range from −3.0 to 0.8, with two-stage model ages of 2.0–1.8 Ga. These ca. 1.02 Ga granitoids were likely generated by the partial melting of amphibolites under H<sub>2</sub>O-rich conditions originated from hydrous fluids of the subduction components, reinforced a latest Mesoproterozoic arc-back-arc system in the southwestern Yangtze Block. Based on the spatial–temporal variations of the late Mesoproterozoic subduction-related magmatic records around the periphery of the Yangtze Block, it is suggested that this block may have started to drift towards the Rodinia supercontinent at least at ca. 1.02 Ga.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107635"},"PeriodicalIF":3.2000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Latest Mesoproterozoic arc-related granitoid magmatism in the southwestern Yangtze Block, South China: Petrogenesis and geodynamic implications\",\"authors\":\"Mingda Huang , Xiaozhuang Cui , Guangming Ren , Qi Deng , Fenglin Chen , Junwei Yang , Tao Li , Zhiming Sun\",\"doi\":\"10.1016/j.precamres.2024.107635\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The geodynamic setting of the southwestern Yangtze Block in the latest Mesoproterozoic has been a controversial issue for decades, which confuses the relationship between the Yangtze Block and the assembly of Rodinia supercontinent. We here report an integrated dataset of petrology, whole-rock geochemistry, zircon U-Pb ages and Hf isotopes for the newly identified latest Mesoproterozoic granitoids from the Yonglang area, southwestern Yangtze Block. SHRIMP and LA-ICP-MS zircon U-Pb dating results suggest that these granitoids were mainly crystallized at ca. 1.02 Ga. These samples show typical geochemical signatures of I-type granite, such as negative correlation between P<sub>2</sub>O<sub>5</sub> and SiO<sub>2</sub> contents, positive correlation between A/CNK ratios and SiO<sub>2</sub> contents, and zirconium saturation temperature (<em>T</em><sub>zr</sub>) of 748–818 °C. Their zircon ε<sub>Hf</sub>(t) values range from −3.0 to 0.8, with two-stage model ages of 2.0–1.8 Ga. These ca. 1.02 Ga granitoids were likely generated by the partial melting of amphibolites under H<sub>2</sub>O-rich conditions originated from hydrous fluids of the subduction components, reinforced a latest Mesoproterozoic arc-back-arc system in the southwestern Yangtze Block. Based on the spatial–temporal variations of the late Mesoproterozoic subduction-related magmatic records around the periphery of the Yangtze Block, it is suggested that this block may have started to drift towards the Rodinia supercontinent at least at ca. 1.02 Ga.</div></div>\",\"PeriodicalId\":49674,\"journal\":{\"name\":\"Precambrian Research\",\"volume\":\"417 \",\"pages\":\"Article 107635\"},\"PeriodicalIF\":3.2000,\"publicationDate\":\"2025-02-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Precambrian Research\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0301926824003486\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Precambrian Research","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301926824003486","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

摘要

摘要中元古代晚期扬子地块西南部的地球动力学背景一直是一个有争议的问题，它混淆了扬子地块与罗迪尼亚超大陆组合的关系。本文报道了扬子地块西南永朗地区最新发现的中元古代花岗岩类的岩石学、全岩地球化学、锆石U-Pb年龄和Hf同位素的综合数据集。SHRIMP和LA-ICP-MS锆石U-Pb定年结果表明，这些花岗岩类主要在约1.02 Ga结晶。样品具有典型的i型花岗岩地球化学特征，P2O5与SiO2含量呈负相关，A/CNK比值与SiO2含量呈正相关，锆饱和温度Tzr为748 ~ 818℃。锆石εHf(t)值在−3.0 ~ 0.8之间，两阶段模型年龄为2.0 ~ 1.8 Ga。这些约1.02 Ga的花岗岩类可能是由角闪岩在富水条件下部分熔融形成的，源自俯冲成分的含水流体，强化了扬子地块西南部最新的中元古代弧-弧后体系。根据扬子地块周缘晚中元古代俯冲相关岩浆记录的时空变化，认为该地块至少在约1.02 Ga开始向Rodinia超大陆漂移。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Latest Mesoproterozoic arc-related granitoid magmatism in the southwestern Yangtze Block, South China: Petrogenesis and geodynamic implications

The geodynamic setting of the southwestern Yangtze Block in the latest Mesoproterozoic has been a controversial issue for decades, which confuses the relationship between the Yangtze Block and the assembly of Rodinia supercontinent. We here report an integrated dataset of petrology, whole-rock geochemistry, zircon U-Pb ages and Hf isotopes for the newly identified latest Mesoproterozoic granitoids from the Yonglang area, southwestern Yangtze Block. SHRIMP and LA-ICP-MS zircon U-Pb dating results suggest that these granitoids were mainly crystallized at ca. 1.02 Ga. These samples show typical geochemical signatures of I-type granite, such as negative correlation between P₂O₅ and SiO₂ contents, positive correlation between A/CNK ratios and SiO₂ contents, and zirconium saturation temperature (T_zr) of 748–818 °C. Their zircon ε_Hf(t) values range from −3.0 to 0.8, with two-stage model ages of 2.0–1.8 Ga. These ca. 1.02 Ga granitoids were likely generated by the partial melting of amphibolites under H₂O-rich conditions originated from hydrous fluids of the subduction components, reinforced a latest Mesoproterozoic arc-back-arc system in the southwestern Yangtze Block. Based on the spatial–temporal variations of the late Mesoproterozoic subduction-related magmatic records around the periphery of the Yangtze Block, it is suggested that this block may have started to drift towards the Rodinia supercontinent at least at ca. 1.02 Ga.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

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.