Permian tectonic evolution of the eastern section of the northern margin of the North China Plate: Constraints from zircon U-Pb geochronology and geochemistry of the volcanic rocks
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摘要:
本文对华北板块北缘东段大河深组、关门咀子组火山岩进行了锆石LA-ICP-MS U-Pb定年和岩石地球化学研究以便制约该区的区域构造演化。大河深组和关门咀子组火山岩中的锆石均呈自形-半自形晶, 具有清晰的岩浆振荡生长环带和条痕状吸收(玄武安山岩) 的特点, 其Th/U比值高达0.31~1.56, 表明其岩浆成因。测年结果表明, 桦甸大河深组流纹岩形成于早二叠世(279±3Ma~293±2Ma), 珲春和图们关门咀子组玄武安山岩和玄武岩分别形成于早二叠世(275±7Ma) 和晚二叠世(250±5Ma)。大河深组火山岩SiO2含量介于64.9%~75.4%, Mg#值介于0.21~0.57, 属于中钾-高钾钙碱性系列, 明显富集轻稀土元素(LREEs) 和大离子亲石元素(LILEs)、亏损高场强元素(HFSEs, 如Nb、Ta、Ti) 以及P元素, 类似活动大陆边缘火山岩；其锆石的εHf(t) 值为+0.9~+10.37, Hf同位素二阶段模式年龄值为785~1240Ma, 表明它们均起源于中-新元古代新增生玄武质下地壳的部分熔融。珲春早二叠世关门咀子组属于中钾钙碱性系列；贫硅(53.4%~53.7%) 和HFSEs, 富铝(16.4%~16.8%) 和LILEs, 具有较低的稀土元素总量, 以及较平坦的稀土配分型式, 显示出岛弧火山岩的地球化学属性；该组火山岩的原始岩浆应起源于受俯冲板片脱水熔融交代的亏损地幔楔。图们晚二叠世关门咀子组玄武岩SiO2含量为48.7%~49.6%, Mg#值高达0.64~0.72, 相对富集LREEs和LILEs, 亏损HREEs和HFSEs, 具有火山弧玄武岩的地球化学属性, 同时其εNd(t)=+6.01, 暗示其原始岩浆起源于亏损的岩石圈地幔。综上所述, 我们认为早二叠世至晚二叠世期间, 华北板块北缘东段(吉林中部地区) 和兴凯地块西南缘均处于古亚洲洋的俯冲作用下。
Abstract:LA-ICP-MS zircon U-Pb dating and geochemical data have been obtained for the volcanic rocks from the Daheshen and Guanmenzuizi formations in the middle-eastern parts of Jilin Province, with the aim of constraining the tectonic nature of the eastern section of the northern margin of the North China Plate in Late Paleozoic. Zircons from the volcanic rocks in the Daheshen and Guanmenzuizi formations are euhedral-subhedral in shape and display fine-scale oscillatory zoning and striped absorption (basaltic andesite) as well as high Th/U ratios (0.31~1.56), implying their magmatic origin. LA-ICP-MS zircon U-Pb age data indicate that the dacite and rhyolites from the Daheshen Formation in Huadian County formed in the Early Permian (279±3Ma~293±2Ma), whereas the basaltic andesite and basalt from the Guanmenzuizi Formation in the Hunchun and Tumen areas formed in the Early Permian (275±7Ma) and Late Permian (250±5Ma), respectively. The volcanic rocks from the Daheshen Formation have SiO2=64.9%~75.4%, Mg#=0.21~0.57, belonging chemically to medium-to high-K calc-alkaline series, and display an enrichment in LREEs and LILEs and depletion in HFSEs (such as Nb, Ta, and Ti) and P, similar chemically to those from an active continental margin setting. Their initial Hf isotopic ratios and Hf two-stage model ages range from +0.9 to +10.37 and from 785Ma to 1240Ma, respectively, suggesting that their primary magmas could be mainly derived from partial melting of the Meso-Neoproterozoic accretted lower crust. The Early Permian basaltic andesites from the Guanmenzuizi Formation in Hunchun area, belonging chemically to medium-K calc-alkaline series, are poor in SiO2 (53.4%~53.7%) and HFSEs, rich in Al2O3 (16.4%~16.8%) and LILEs, and display low REE abundances and flat REE pattern, similar to those from an island arc setting. The primary magma of the basaltic andesites could be mainly derived from partial melting of the depleted mantle wedge metasomatized by the subducted slab-derived fluid. The Late Permian basalts from the Guanmenzuizi Formation in Tumen area have SiO2=48.7%~49.6%, Mg#=0.64~0.72, and are enriched in LREEs and LILEs, and depleted in HREEs and HFSEs, similar chemically to those from a volcanic arc setting. Combined with its Nd isotopic ratios (+6.01), we consider that its primary magma could be derived from partial melting of a depleted lithospheric mantle. Taken together, we conclude that the subduction of the Paleo-Asian oceanic plate happened in both the eastern section of the northern margin of the North China Plate (in middle part of Jilin Province) and the southwestern margin of the Khanka Massif from Early Permian to Late Permian.
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图 1
华北北缘板块北缘东段地质略图
Figure 1.
Geological sketch map of the eastern section of the northern margin of the North China Plate
图 2
二叠纪火山岩的显微结构特征
Figure 2.
Microphotographs showing textures of the Permian volcanic rocks
图 3
二叠纪火山岩部分锆石CL图像
Figure 3.
CL images of selected zircons from the Permian volcanic rocks
图 4
二叠纪火山岩中锆石LA-ICP-MS U-Pb年龄谐和图
Figure 4.
Concordia diagram showing LA-ICP-MS zircon U-Pb dating date for the Permian volcanic rocks
图 5
二叠纪火山岩的TAS图(据Middlemost and Eric, 1994)
Figure 5.
TAS diagram for the Permian volcanic rocks (after Middlemost and Eric, 1994)
图 6
二叠纪火山岩的硅钾图(据Peccerillo and Taylor, 1976)
Figure 6.
SiO2 vs. K2O diagram for the Permian volcanic rocks (after Peccerillo and Taylor, 1976)
图 7
二叠纪火山岩的球粒陨石标准化稀土元素配分图(a, c, e, 标准化值据Boynton, 1984) 和原始地幔标准化痕量元素蛛网图(b, d, f, 标准化值据Sun and Mc Donough, 1989)
Figure 7.
Chondrite-normalized REE patterns (a, c, e, normalization values after Boynton, 1984) and primitive mantle-normalized trace element spider diagrams (b, d, f, normalization values after Sun and Mc Donough, 1989) for the Permian volcanic rocks
图 8
大河深组火山岩的Hf同位素特征
Figure 8.
Zircon Hf isotopic compositions for the volcanic rocks from the Daheshen Formation
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Zhang JF and Zhang YP
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