根据锆石U-Pb测年和侵入岩地球化学推断祁连造山带东南部志留纪—早泥盆世构造演化

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of the Geological Society Pub Date : 2023-06-19 DOI:10.1144/jgs2022-162
Xiyao Li, San-zhong Li, Sheng‐yao Yu, Yong‐jiang Liu, Zhen Qin, Zeng-Bao Huang, Qing Lu
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引用次数: 0

摘要

祁连造山带早古生代至中古生代构造热事件是在原特提斯洋闭合和冈瓦纳大陆外围微大陆汇聚期间发展起来的。本文介绍了祁连造山带东南部花岗质岩石和镁铁质岩脉的地质年代、地球化学和Sr-Nd-Hf同位素数据。荔湾(440 Ma)、石峡(434 Ma)和湖川(429 Ma)花岗岩具有金属发光至弱过发光特征,全岩εNd(t)值分别为1.1至1.6、-4.2至-4.4和-2.6至1.1,锆石εHf(t)分别为0至8.9、-6.6至1.6和-4.6至2.2。地球化学数据表明,荔湾、石峡和壶川花岗岩类分别源于元古界基底的部分熔融,并添加了新生物质、长英质地壳基底和镁铁质地壳物质。张家源镁铁质岩脉(403Ma)为高钾-钠玄岩,全岩εNd(t)(-1.1至-0.9)和锆石εHf(t)值(-0.9至13.3)源自富集的岩石圈地幔。我们认为,这些志留系-早泥盆系侵入岩是通过一系列复杂的事件形成的,这些事件涉及志留系期间与弧相关的俯冲,然后是板块撕裂到碰撞后过程,以及随后的早泥盆世岩石圈伸展。补充材料:https://doi.org/10.6084/m9.figshare.c.6693575
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Silurian to Early Devonian tectonic evolution of the southeastern Qilian Orogen inferred from zircon U–Pb dating and geochemistry of intrusive rocks
Early to mid-Paleozoic tectono-thermal events in the Qilian Orogen developed during the closure of the Proto-Tethys Ocean and the convergence of microcontinents in the periphery of East Gondwana. In this paper, we present geochronological, geochemical, and Sr-Nd-Hf isotopic data for the granitoid rocks and mafic dykes in southeastern Qilian Orogen. The Liwan (440 Ma), Shixia (434 Ma), and Huchuan (429 Ma) granitoid rocks have metaluminous to weakly peraluminous features, with whole-rock ε Nd (t) values of 1.1 to 1.6, -4.2 to -4.4, and -2.6 to 1.1, and zircon ε Hf (t) values of 0 to 8.9, -6.6 to 1.6, and -4.6 to 2.2, respectively. Geochemical data suggest that the Liwan, Shixia, and Huchuan granitoids are derived from partial melting of the Proterozoic basement with an addition of juvenile material, a felsic crustal basement, and a mafic crustal material, respectively. The Zhangjiayuan mafic dykes (403 Ma) are high-K to shoshonitic with whole-rock ε Nd (t) (-1.1 to -0.9) and zircon ε Hf (t) values (-0.9 to 13.3), derived from an enriched lithospheric mantle. We suggest that these Silurian–Early Devonian intrusive rocks were formed via a complex series of events involving arc-related subduction followed by slab-tearing to post-collisional processes during the Silurian and subsequent lithospheric extension in the Early Devonian. Supplementary material: https://doi.org/10.6084/m9.figshare.c.6693575
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来源期刊
Journal of the Geological Society
Journal of the Geological Society 地学-地球科学综合
CiteScore
6.00
自引率
3.70%
发文量
68
审稿时长
6-12 weeks
期刊介绍: Journal of the Geological Society (JGS) is owned and published by the Geological Society of London. JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed. Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists. The journal publishes research and invited review articles, discussion papers and thematic sets.
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