秦岭-祁连接合带巫山-商丹洋造山演化探究:早泥盆世太鲁岩块的启示

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-09-05 DOI:10.3390/min14090910
Hao Lin, Zuochen Li, Xianzhi Pei, Ruibao Li, Hai Zhou, Meng Wang, Shaowei Zhao, Li Qin, Mao Wang
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引用次数: 0

摘要

秦岭-祁连连线带的主要海洋-大陆转换阶段发生在早古生代,出现了大量与俯冲碰撞有关的岩浆岩。然而,关于原特提斯洋(此处称为巫山-商丹洋)俯冲-碰撞造山过程的持续时间仍存在较大争议。我们提供了该地区典型的早泥盆世火成岩的地质年代、地球化学和Lu-Hf同位素数据,并将其命名为泰卢岩体。410Ma时的台路岩块由富K、钙碱性、金属铝质A型花岗岩组成,Y/Nb比(0.85-1.35)和A/CNK值(0.90-1.01)较低;SiO2含量(65.44-74.46 wt%)、Mg#值(39.2-50.7)和锆石饱和度较高。7)和锆石饱和温度(745 至 846 °C);以及负的 εHf (t) 值(-8.0 至-1.9);因此,它们是板内岩浆作用过程中古代长英质下地壳部分熔融并伴有地幔衍生物质的结果。台路岩的研究为早古生代秦岭-祁连接合带的演化过程提供了更充分的证据,它与原特提斯洋北部巫山-商丹洋的演化过程有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating the Orogenic Evolution of the Wushan–Shangdan Ocean in the Qinling–Qilian Conjunction Zone: Insights from the Early Devonian Tailu Pluton
The main ocean–continent transformation stage of the Qinling and Qilian conjunction zone happened in the Early Paleozoic with the occurrence of a lot of subduction–collision–related magmatic rocks. However, there is still considerable controversy over the duration of the subduction–collision orogeny process of the Proto-Tethys Ocean, here termed as the Wushan–Shangdan Ocean. We provide geochronological, geochemical, and Lu-Hf isotopic data for typical Early Devonian igneous rocks there, named Tailu pluton. The Tailu pluton at 410 Ma comprised K-rich, calc-alkaline, metaluminous A-type granite with low Y/Nb ratios (0.85 to 1.35) and A/CNK values (0.90 to 1.01); with high SiO2 contents (65.44 to 74.46 wt%), Mg# values (39.2 to 50.7), and zircon saturation temperatures (745 to 846 °C); and with negative εHf (t) values (−8.0 to −1.9); therefore, they resulted from the partial melting of the ancient felsic lower crust accompanied by the incorporation of mantle-derived material during the intraplate magmatism process. Research on Tailu pluton has provided more sufficient evidence for the evolution process of the Qinling–Qilian conjunction zone in the Early Paleozoic, associated with evolution of the Wushan–Shangdan Ocean, the northern part of the Proto-Tethys Ocean.
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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