Genesis and Tectonic Significance of Miocene Tephrite in Laohushan Volcanic Area, Jilin Province
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摘要: 老虎山单成因火山位于吉林省大口钦地区.为了探讨火山区中新世碱玄岩的地球化学特征、成因及其与区域断裂构造演化的耦合性，对其开展了全岩地球化学和Pb同位素研究.碱玄岩中Na2O/K2O=1.30~1.38，A/CNK值（0.97~1.09）偏低，Mg#值（58.05~61.11）偏高，富集Th、U、Nb等高场强元素（HFSEs），相对弱富集Rb、Ba、K等大离子亲石元素（LILEs），LREE/HREE=10.66~11.32，206Pb/204Pb、207Pb/204Pb和208Pb/204Pb值范围分别为17.661~17.675、15.451~15.457和37.652~37.692.成岩岩浆主要来源于软流圈地幔，混有少量俯冲洋壳物质，显示出OIB或板内交代富集型地幔源的属性，岩浆形成深度范围约在93~105 km，伊通-舒兰断裂的存在为火山深部岩浆的上升与裂隙式喷发提供了通道和空间，玄武质岩浆的形成及其对应的火山活动发生于伸展构造环境中.Abstract: The Laohushan monogenic volcano is located in Dakouqin area, southern Jilin Province. In order to explore the geochemistry characteristics and genesis of the Miocene tephrite in this volcanic area, together with the coupling between it and the evolution of regional fault structure, the whole rock geochemistry and Pb isotope study on it were carried out. Na2O/K2O values of the tephrites are range from 1.30 to 1.38, with low A/CNK (0.97-1.09) and high Mg# (58.05-61.11) values. The tephrites are enriched in high field strength elements (HFSEs), such as Th, U and Nb, and relatively weakly enriched in large ion lithophile elements (LILEs), such as Rb, Ba and K, with LREE/HREE=10.66-11.32. The values of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb are range from 17.661 to 17.675, 15.451 to 15.457 and 37.652 to 37.692, respectively. The parental magma is mainly from the asthenosphere mantle, with a small amount of subducted oceanic crust components, which shows the attribute characteristics of OIB (oceanic island basalt) or intraplate metasomatic enriched mantle source. The depth range of magma formation is about 93-105 km, and the existence of the Yitong-Shulan fault provides conduit and space for magma upwelling and fissure eruption. In addition, the formation of basaltic magma and its associated volcanic activity occurred in an extensional tectonic environment.
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Key words:
- element geochemistry /
- lead isotope /
- tephrite /
- Laohushan volcano /
- Jilin Province /
- geochemistry /
- petrology
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图 1 吉林省伊通-舒兰断裂带火山群位置简图(a)、中国东北部地区中-新生代地质构造简图(b)和大口钦老虎山火山区地质简图(c)
图a据Sun et al.（2022）修改；图b据Sun et al.（2022）修改；图c据吉林省地质矿产局（1988）修改
Fig. 1. Overview of the location of volcanic groups in Yitong-Shulan fault zone, Jilin Province (a), Mesozoic-Cenozoic geotectonic map of Northeast China (b) and geological map of the Laohushan volcanic area in Dakouqin (c)
图 2 老虎山火山野外图像(a)、碱玄岩的野外产状图像(b)、碱玄岩的手标本图像(c)、碱玄岩镜下矿物组成(d~e)
Chal.玉髓；Pl.斜长石；Ol.橄榄石；Opx.斜方辉石
Fig. 2. Field occurrence image of the Laohushan volcano in the study area (a), field occurrence image of tephrite (b), hand specimen image of tephrite (c), main rock-forming minerals of tephrite under microscope (d-e)
图 5 老虎山碱玄岩全岩中207Pb/204Pb与206Pb/204Pb铅同位素图解(a)和206Pb/204Pb与208Pb/204Pb铅同位素图解(b)
底图据Zartman and Doe（1981）修改
Fig. 5. 207Pb / 204Pb and 206Pb / 204Pb isotopic diagram (a) and 206Pb / 204Pb and 208Pb / 204Pb isotopic diagram (b) in the whole rock of tephrites in the Laohushan volcanic area
图 6 长白山火山区及邻区晚新生代火山岩年龄频次
年龄为汇总的长白山火山区及邻区晚新生代火山岩的K-Ar、40Ar-39Ar、14C和锆石U-Pb测年结果，阴影区域为不同年龄的分布数量，曲线为频次趋势线.底图据Li et al.（2021）修改
Fig. 6. Age frequency of Late Cenozoic volcanic rocks in Changbai Mountain volcanic area and its adjacent areas
图 7 Na2O+K2O-δEu图解(a)、Ba/La-Ba/Nb图解(b)、La/Ba-La/Nb图解(c)、Ba/Th-La/Sm图解(d)、Th/Hf -Ta/Hf图解(e)、Th/Yb-Ta/Yb图解(f)
图e中：I.板块发散边缘N-MORB区; II.板块汇聚边缘; III.大洋板内洋岛及大洋中脊玄武岩区; IV1.陆内裂谷及陆缘裂谷拉斑玄武岩区; IV2.陆内裂谷碱性玄武岩区; IV3.大陆拉张带玄武岩区; V.地幔热柱玄武岩区; 图f：中ICA.岛弧钙碱性系列; SHO.橄榄玄武粗面质; TH.拉斑系列; E-MORB.富集大洋玄武岩; N-MORB.正常大洋玄武岩; OIB.洋岛玄武岩.底图据赵振华（2016）修改
Fig. 7. Na2O+K2O versus δEu diagram (a), Ba/La versus Ba/Nb diagram (b), La/Ba versus La/Nb diagram (c), Ba/Th versus La/Sm diagram (d), Th/Hf versus Ta/Hf diagram (e), Th/Yb versus Ta/Yb diagram (f)
图 9 伊通-舒兰断裂带31~9 Ma岩石圈深部壳幔结构图(a)和(b)Na/Ti-Sm/Yb图解(b)
图a底图据张辉煌等（2006）修改；图b底图据赵振华（2016）修改
Fig. 9. Deep crust mantle structure of 31-9 Ma lithosphere of Yitong-Shulan fault (a) and Na/Ti versus Sm/Yb diagram (b)
表 1 老虎山碱玄岩全岩Pb同位素组成
Table 1. Lead isotopic composition of tephrite in the Laohushan volcano
样品编号 岩性 206Pb/204Pb 2σ 208Pb/204Pb 2σ 207Pb/204Pb 2σ Δβ Δγ Jhly05a 碱玄岩 17.675 0.003 37.692 0.007 15.457 0.003 8.1 6.5 Jhly05b 碱玄岩 17.661 0.004 37.654 0.010 15.454 0.004 7.9 5.5 Jhly05c 碱玄岩 17.665 0.005 37.652 0.011 15.451 0.004 7.7 5.4 注：Δβ和Δγ的具体含义和计算方法据朱炳泉(1998)，分别表示样品的207Pb/204Pb和208Pb/204Pb相对于同时代地幔的偏差值.Δβ= [βs(t)/βm(t)-1]×1 000，Δγ= [γs(t)/γm(t)-1]×1 000，β= 207Pb/204Pb，γ= 208Pb/204Pb，s表示样品，m表示地幔，t为样品形成时代.关于不同时代地幔Pb同位素组成计算采用地幔增长线公式，即取地幔μ值为7.8，232Th/238U = 4.04，地球年龄取4.57 Ga，原始Pb同位素组成取206Pb/204Pb = 9.307，207Pb/204Pb = 10.294，208Pb/204Pb = 29.476. 
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