| 延边开山屯地区二叠纪地质体的构造属性：侵入岩及碎屑锆石证据 |
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| 引用本文： | 魏敬洋,裴福萍,周皓,焦骥,王奕朋.延边开山屯地区二叠纪地质体的构造属性：侵入岩及碎屑锆石证据[J].岩石学报,2020,36(3):759-780. |
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| 作者姓名： | 魏敬洋 裴福萍 周皓 焦骥 王奕朋 |
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| 作者单位： | 吉林大学地球科学学院, 长春 130061,吉林大学地球科学学院, 长春 130061;自然资源部东北亚矿产资源评价重点实验室, 长春 130061;东北亚生物演化与环境教育部重点实验室, 长春 130026,吉林大学地球科学学院, 长春 130061,吉林大学地球科学学院, 长春 130061,吉林大学地球科学学院, 长春 130061 |
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| 基金项目： | 本文受国家重点基础研究发展计划项目（2017YFC0601304）、国家自然科学基金项目（41572043）、自然资源部东北亚矿产资源评价重点实验室自主基金课题（DBY-ZZ-18-02）和吉林大学研究生创新基金资助项目（101832018C037）联合资助. |
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| 摘 要： | 本文对延边开山屯地区二叠纪侵入岩和地层中的(碎屑)锆石进行了LA-ICP-MS和SIMS U-Pb年代学及Hf同位素的研究,同时对侵入岩进行了全岩地球化学特征的研究,以便制约开山屯地区的构造属性以及延边地区晚古生代-早中生代演化历史。延边开山屯地区大蒜沟组复成分砾岩和岩屑杂砂岩中锆石最年轻峰值年龄为298Ma和293Ma,此外还存在330Ma、366Ma、438Ma、454Ma、479Ma峰值年龄。这些古生代碎屑锆石的ε_(Hf)(t)值介于-1.14～+15.17之间;开山屯组长石杂砂岩和长石砂岩中的锆石最年轻年龄峰值分别为259Ma和253Ma,此外还存在279Ma、456Ma、476Ma、500Ma、529Ma以及新元古代-古元古代(891～1765Ma)的峰值年龄。其中古生代碎屑锆石的ε_(Hf)(t)值介于-5.22～+10.15之间。开山屯地区中二叠世闪长岩和晚二叠世辉长闪长岩的形成时代分别为261Ma和256Ma,属于低钾拉斑-中钾钙碱性系列,相对富集轻稀土和大离子亲石元素,亏损重稀土和高场强元素,主要来源于受俯冲流体/熔体交代的亏损地幔楔的部分熔融。综合研究认为,开山屯地区与兴凯地块具有亲缘性;大蒜沟组的沉积时限为早-中二叠世,形成于兴凯地块西部活动大陆边缘的弧前盆地或增生楔环境;开山屯组形成于早-中三叠世,具有双向物源的特点(华北板块和兴凯地块)。早-中二叠世延边地区处于活动大陆边缘的构造背景。延边地区的古亚洲洋于早-中三叠世最终闭合。
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| 关 键 词： | 延边地区 二叠纪 古亚洲洋 侵入岩 碎屑锆石 锆石U-Pb年代学 |
| 收稿时间： | 2019/8/11 0:00:00 |
| 修稿时间： | 2019/12/30 0:00:00 |
Tectonic nature of Permian terrane in the Kaishantun area, Yanbian: Evidence from intrusive rocks and detrital zircons |
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| WEI JingYang,PEI FuPing,ZHOU Hao,JIAO Ji and WANG YiPeng.Tectonic nature of Permian terrane in the Kaishantun area, Yanbian: Evidence from intrusive rocks and detrital zircons[J].Acta Petrologica Sinica,2020,36(3):759-780. |
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| Authors: | WEI JingYang PEI FuPing ZHOU Hao JIAO Ji and WANG YiPeng |
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| Institution: | College of Earth Sciences, Jilin University, Changchun 130061, China,College of Earth Sciences, Jilin University, Changchun 130061, China;MNR Key Laboratory of Evaluation of Mineral Resources in Northeast Asia, Changchun 130061, China;MOE Key Laboratory for Biological Evolution and Environment in Northeast Asia, Changchun 130026, China,College of Earth Sciences, Jilin University, Changchun 130061, China,College of Earth Sciences, Jilin University, Changchun 130061, China and College of Earth Sciences, Jilin University, Changchun 130061, China |
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| Abstract: | LA-ICP-MS and SIMS zircon U-Pb dating, Hf isotopic analyses for the Permian intrusive rocks and strata in the Kaishantun area, Yanbian, together with whole-rock geochemistry of the intrusive rocks, are presented to constrain the tectonic nature of the Kaishantun area, and the Late Paleozoic to Early Mesozoic evolution history of the Yanbian area. The age spectrums of detrital zircons from polygenic conglomerate and lithic graywacke in the Dasuangou Formation exhibit the youngest populations at 298Ma and 293Ma, together with other populations of 330Ma, 366Ma, 438Ma, 454Ma and 479Ma. Initial Hf isotopic ratios of the Paleozoic detrital zircons from the Dasuangou Formation range from -1.14 to +15.17. The age spectrums of detrital zircons of feldspathic graywacke and feldspathic sandstone from the Kaishantun Formation show the youngest populations at 259Ma and 253Ma, together with age peaks of 279Ma, 456Ma, 476Ma, 500Ma and 529Ma, as well as Paleoproterozoic to Neoproterozoic (891~1765Ma). Initial Hf isotopic ratios of the Paleozoic detrital zircons from the Kaishantun Formation range from -5.22 to +10.15. According to zircon U-Pb dating, the diorite and gabbro diorite formed in the Middle Permian (261Ma) and the Late Permian (256Ma), respectively. They belong chemically to low-K tholeiitic and medium-K calc-alkaline series, and are characteristized by enrichment in light rare earth elements and large ion lithophile elements, and depletion of heavy rare earth elements and high field strength elements. The primary magma of the diorite and gabbro diorite could be mainly derived from partial melting of depleted mantle wedge metasomatized by subduction fluid/melt. Above all, the Dasuangou Formation deposited during the Early-Middle Permian, and was located under the fore-arc basin or accretionary wedge on the western active continental margin of the Khanka Massif; The Kaishantun Formation deposited during the Early-Middle Triassic, with the characteristics of bidirectional provenance (from the North China Block and Khanka Massif). The Kaishantun area had an affinity with the Khanka Massif during the Late Paleozoic, and Yanbian area (including Kaishantun area) was under an active continental margin environment during the Early-Middle Permian. The final closure of the Paleo-Asian Ocean in Yanbian area occurred during the Early-Middle Triassic. |
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| Keywords: | Yanbian area Permian Paleo-Asian Ocean Intrusive rocks Detrital zircons Zircon U-Pb chronology |
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