秦航带南部加里东期a型花岗岩类的识别:与早古生代伸展的构造联系

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Liuyun Ouyang , Wenting Huang , Jing Wu , Juan Liao , Jian Zhang , Xilian Chen , Huaying Liang
{"title":"秦航带南部加里东期a型花岗岩类的识别:与早古生代伸展的构造联系","authors":"Liuyun Ouyang ,&nbsp;Wenting Huang ,&nbsp;Jing Wu ,&nbsp;Juan Liao ,&nbsp;Jian Zhang ,&nbsp;Xilian Chen ,&nbsp;Huaying Liang","doi":"10.1016/j.sesci.2022.12.001","DOIUrl":null,"url":null,"abstract":"<div><p>Evolution of the late Ordovician–Silurian Caledonian orogeny (ca. 460–420 Ma) in the South China Block (SCB) remains controversial due to the overprinting Triassic (Indosinian) and Jurassic-Cretaceous (Yanshanian) orogenic tectonics and the absence of enough petrologic records. This work reported a systematic study of whole-rock geochemistry, zircon U–Pb geochronology and Hf isotopes of the first Caledonian A-type granitoids (Dishui) in Jinxiu county, Guangxi (SW China). The Dishui granitoids are tectonically located in the southwestern Qin-Hang suture belt, which is the largest ancient orogenic belt formed by the collision of the Yangtze and Cathaysia blocks in South China. The Dishui granitoids consist primarily of a syenogranite pluton with a small-scale granodiorite porphyry dike. The Dishui syenogranite and granodiorite porphyry have LA-ICP-MS zircon U–Pb ages of 437.9 ± 1.0 Ma (MSWD = 0.77) and 436.6 ± 0.8 Ma (MSWD = 1.7), respectively. The syenogranite has high contents of SiO<sub>2</sub> (73.20–77.35 wt.%), total alkalis (Na<sub>2</sub>O + K<sub>2</sub>O = 7.42–8.99 wt.%), total REE (198–445 ppm), high field strength elements (HFSEs: Zr + Nb + Ce + Y = 253–520 ppm), and 10,000∗Ga/Al (2.93–3.11) and FeO<sub>t</sub>/(FeO<sub>t</sub> + MgO) (0.77–0.96) ratios and high F concentration, resembling highly-fractionated A-type granite. The granodiorite porphyry displays similar A-type granite affinities, including high (Zr + Nb + Ce + Y) (410–485 ppm), 10,000∗Ga/Al (2.47–4.59), and zircon saturation temperature (T<sub>Zr</sub> = 908–927 °C), medium to high SiO<sub>2</sub> (64.56–64.95 wt.%), Fe<sub>2</sub>O<sub>3</sub> (7.70–8.11 wt.%), and MgO (3.69–4.09 wt.%), and low FeO<sub>t</sub>/(FeO<sub>t</sub> + MgO) (0.61–0.64), resembling magnesian unfractionated A-type granitoid. The Dishui syenogranite and granodiorite porphyry dike have zircon ε<sub>Hf</sub>(t) value and two-stage model age (T<sub>DM2</sub>) of −3.9 to +1.5 and 1.32–1.66 Ga, and −1.7 to +11.8 and 0.94–1.53 Ga, respectively, both much more depleted than many Caledonian gneissic/massive granites and the Devonian A-type granites (ε<sub>Hf</sub>(t) = −14.9 to −3.5) in South China. All these data suggest that the Dishui syenogranite was derived from partial melting of the Proterozoic metamorphic basement with mantle-derived melt input, and the magma subsequently underwent extensive fractionation. Meanwhile, the Dishui granodiorite porphyry was likely derived from the same crustal melt with more mantle-derived input. New ages of the Dishui A-type granitoids (ca. 436–437 Ma) in the Qin-Hang belt indicate a tectonic transition from syn-collisional crustal thickening to post-collisional extension at ∼437 Ma in South China.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":null,"pages":null},"PeriodicalIF":2.0000,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Identification of the first Caledonian A-type granitoids in the southern Qin-Hang belt of south China: Tectonic link to early Paleozoic extension\",\"authors\":\"Liuyun Ouyang ,&nbsp;Wenting Huang ,&nbsp;Jing Wu ,&nbsp;Juan Liao ,&nbsp;Jian Zhang ,&nbsp;Xilian Chen ,&nbsp;Huaying Liang\",\"doi\":\"10.1016/j.sesci.2022.12.001\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Evolution of the late Ordovician–Silurian Caledonian orogeny (ca. 460–420 Ma) in the South China Block (SCB) remains controversial due to the overprinting Triassic (Indosinian) and Jurassic-Cretaceous (Yanshanian) orogenic tectonics and the absence of enough petrologic records. This work reported a systematic study of whole-rock geochemistry, zircon U–Pb geochronology and Hf isotopes of the first Caledonian A-type granitoids (Dishui) in Jinxiu county, Guangxi (SW China). The Dishui granitoids are tectonically located in the southwestern Qin-Hang suture belt, which is the largest ancient orogenic belt formed by the collision of the Yangtze and Cathaysia blocks in South China. The Dishui granitoids consist primarily of a syenogranite pluton with a small-scale granodiorite porphyry dike. The Dishui syenogranite and granodiorite porphyry have LA-ICP-MS zircon U–Pb ages of 437.9 ± 1.0 Ma (MSWD = 0.77) and 436.6 ± 0.8 Ma (MSWD = 1.7), respectively. The syenogranite has high contents of SiO<sub>2</sub> (73.20–77.35 wt.%), total alkalis (Na<sub>2</sub>O + K<sub>2</sub>O = 7.42–8.99 wt.%), total REE (198–445 ppm), high field strength elements (HFSEs: Zr + Nb + Ce + Y = 253–520 ppm), and 10,000∗Ga/Al (2.93–3.11) and FeO<sub>t</sub>/(FeO<sub>t</sub> + MgO) (0.77–0.96) ratios and high F concentration, resembling highly-fractionated A-type granite. The granodiorite porphyry displays similar A-type granite affinities, including high (Zr + Nb + Ce + Y) (410–485 ppm), 10,000∗Ga/Al (2.47–4.59), and zircon saturation temperature (T<sub>Zr</sub> = 908–927 °C), medium to high SiO<sub>2</sub> (64.56–64.95 wt.%), Fe<sub>2</sub>O<sub>3</sub> (7.70–8.11 wt.%), and MgO (3.69–4.09 wt.%), and low FeO<sub>t</sub>/(FeO<sub>t</sub> + MgO) (0.61–0.64), resembling magnesian unfractionated A-type granitoid. The Dishui syenogranite and granodiorite porphyry dike have zircon ε<sub>Hf</sub>(t) value and two-stage model age (T<sub>DM2</sub>) of −3.9 to +1.5 and 1.32–1.66 Ga, and −1.7 to +11.8 and 0.94–1.53 Ga, respectively, both much more depleted than many Caledonian gneissic/massive granites and the Devonian A-type granites (ε<sub>Hf</sub>(t) = −14.9 to −3.5) in South China. All these data suggest that the Dishui syenogranite was derived from partial melting of the Proterozoic metamorphic basement with mantle-derived melt input, and the magma subsequently underwent extensive fractionation. Meanwhile, the Dishui granodiorite porphyry was likely derived from the same crustal melt with more mantle-derived input. New ages of the Dishui A-type granitoids (ca. 436–437 Ma) in the Qin-Hang belt indicate a tectonic transition from syn-collisional crustal thickening to post-collisional extension at ∼437 Ma in South China.</p></div>\",\"PeriodicalId\":54172,\"journal\":{\"name\":\"Solid Earth Sciences\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.0000,\"publicationDate\":\"2023-03-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Solid Earth Sciences\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2451912X22000496\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2451912X22000496","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 3

摘要

由于三叠纪(印支期)和侏罗纪-白垩纪(燕山期)造山构造叠印,加之缺乏足够的岩石学记录,华南地块晚奥陶—志留纪加里东造山运动(约460 ~ 420 Ma)的演化至今仍存在争议。本文报道了广西锦绣地区第一批加里东期a型花岗岩的全岩地球化学、锆石U-Pb年代学和Hf同位素的系统研究。地水花岗岩类构造上位于秦航缝合带西南部,秦航缝合带是华南地区扬子地块与华夏地块碰撞形成的最大的古造山带。滴水花岗岩体主要由正长花岗岩体和小型花岗闪长斑岩脉组成。滴水正长花岗岩和花岗闪长斑岩的LA-ICP-MS锆石U-Pb年龄分别为437.9±1.0 Ma (MSWD = 0.77)和436.6±0.8 Ma (MSWD = 1.7)。该正长花岗岩具有高SiO2 (73.20 ~ 77.35 wt.%)、高碱(Na2O + K2O = 7.42 ~ 8.99 wt.%)、高稀土(198 ~ 445 ppm)、高场强元素(hfse: Zr + Nb + Ce + Y = 252 ~ 520 ppm)、10,000 * Ga/Al(2.93 ~ 3.11)和FeOt/(FeOt + MgO)(0.77 ~ 0.96)比和高F浓度等特征,具有高分选a型花岗岩的特征。花岗闪长斑岩具有相似的a型花岗岩亲和力,高(Zr + Nb + Ce + Y) (410 ~ 485 ppm), 10000 * Ga/Al(2.47 ~ 4.59),锆石饱和温度(TZr = 908 ~ 927℃),中高SiO2 (64.56 ~ 64.95 wt.%), Fe2O3 (7.70 ~ 8.11 wt.%), MgO (3.69 ~ 4.09 wt.%),低FeOt/(FeOt + MgO)(0.61 ~ 0.64),类似于镁质未分选的a型花岗岩。迪水正长花岗岩和花岗闪长斑岩岩脉的锆石εHf(t)值和两期模式年龄(TDM2)分别为- 3.9 ~ +1.5和1.32 ~ 1.66 Ga, - 1.7 ~ +11.8和0.94 ~ 1.53 Ga,比华南许多加里东期片麻质/块状花岗岩和泥盆系a型花岗岩(εHf(t) = - 14.9 ~ - 3.5)贫得多。这些资料表明,滴水正长花岗岩是由幔源熔融输入的元古代变质基底部分熔融形成的,岩浆随后经历了广泛的分馏作用。同时,滴水花岗闪长斑岩可能来源于同样的地壳熔融,更多的是幔源输入。秦杭带的大水a型花岗岩新时代(约436 ~ 437 Ma)标志着华南地区在~ 437 Ma由同碰撞时期地壳增厚向碰撞后伸展的构造转变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Identification of the first Caledonian A-type granitoids in the southern Qin-Hang belt of south China: Tectonic link to early Paleozoic extension

Evolution of the late Ordovician–Silurian Caledonian orogeny (ca. 460–420 Ma) in the South China Block (SCB) remains controversial due to the overprinting Triassic (Indosinian) and Jurassic-Cretaceous (Yanshanian) orogenic tectonics and the absence of enough petrologic records. This work reported a systematic study of whole-rock geochemistry, zircon U–Pb geochronology and Hf isotopes of the first Caledonian A-type granitoids (Dishui) in Jinxiu county, Guangxi (SW China). The Dishui granitoids are tectonically located in the southwestern Qin-Hang suture belt, which is the largest ancient orogenic belt formed by the collision of the Yangtze and Cathaysia blocks in South China. The Dishui granitoids consist primarily of a syenogranite pluton with a small-scale granodiorite porphyry dike. The Dishui syenogranite and granodiorite porphyry have LA-ICP-MS zircon U–Pb ages of 437.9 ± 1.0 Ma (MSWD = 0.77) and 436.6 ± 0.8 Ma (MSWD = 1.7), respectively. The syenogranite has high contents of SiO2 (73.20–77.35 wt.%), total alkalis (Na2O + K2O = 7.42–8.99 wt.%), total REE (198–445 ppm), high field strength elements (HFSEs: Zr + Nb + Ce + Y = 253–520 ppm), and 10,000∗Ga/Al (2.93–3.11) and FeOt/(FeOt + MgO) (0.77–0.96) ratios and high F concentration, resembling highly-fractionated A-type granite. The granodiorite porphyry displays similar A-type granite affinities, including high (Zr + Nb + Ce + Y) (410–485 ppm), 10,000∗Ga/Al (2.47–4.59), and zircon saturation temperature (TZr = 908–927 °C), medium to high SiO2 (64.56–64.95 wt.%), Fe2O3 (7.70–8.11 wt.%), and MgO (3.69–4.09 wt.%), and low FeOt/(FeOt + MgO) (0.61–0.64), resembling magnesian unfractionated A-type granitoid. The Dishui syenogranite and granodiorite porphyry dike have zircon εHf(t) value and two-stage model age (TDM2) of −3.9 to +1.5 and 1.32–1.66 Ga, and −1.7 to +11.8 and 0.94–1.53 Ga, respectively, both much more depleted than many Caledonian gneissic/massive granites and the Devonian A-type granites (εHf(t) = −14.9 to −3.5) in South China. All these data suggest that the Dishui syenogranite was derived from partial melting of the Proterozoic metamorphic basement with mantle-derived melt input, and the magma subsequently underwent extensive fractionation. Meanwhile, the Dishui granodiorite porphyry was likely derived from the same crustal melt with more mantle-derived input. New ages of the Dishui A-type granitoids (ca. 436–437 Ma) in the Qin-Hang belt indicate a tectonic transition from syn-collisional crustal thickening to post-collisional extension at ∼437 Ma in South China.

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
Solid Earth Sciences
Solid Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
5.00%
发文量
20
审稿时长
103 days
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信