40Ar/39Ar Ages of Gneiss and Granite from Huangling Uplift and Their Tectonic Significance
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摘要: 黄陵花岗岩是研究扬子陆块构造演化和岩浆活动的关键对象，高精度的40Ar/39Ar定年可以为确定黄陵花岗岩的构造演化提供准确的年代学依据.采用40Ar/39Ar阶段加热技术分别测定了黄陵隆起核部变质岩中角闪石、黄陵庙花岗岩中白云母和黑云母单矿物的年龄. 角闪石40Ar/39Ar坪年龄（835.1±0.8）Ma，白云母坪年龄为（830.0±1.7）Ma，黑云母获得上凸型年龄谱，没有形成明显的年龄坪. 分析认为，角闪石年龄指示围岩受到花岗岩侵入烘烤重置的时间，白云母年龄指示黄陵花岗岩冷却至350 ℃的年龄，岩体侵入时间不晚于835 Ma，在835~830 Ma经历快速冷却事件，冷却速率为50 ℃/Ma. 黑云母低温阶段获得的年轻年龄216 Ma，记录了在晚三叠世黄陵地区缓慢差异隆升过程中发生的一期热事件.
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关键词:
- 黄陵花岗岩 /
- 黄陵隆起 /
- 40Ar/39Ar定年 /
- 热扰动 /
- 地球化学
Abstract: The Huangling uplift, located in the front of the northeast corner of the Sichuan Basin, is composed mainly of Huangling granite. The granite is the geological record of the Jinning orogeny and the Rodinia supercontinent cracking in the Yangtze block, and it is critical for understanding the tectonic evolution and magmatic activity of the Yangtze block. To determine the formation time of the Huangling granite, abundant chronological data were published using isotope chronology methods such as U-Pb, K-Ar, and Rb-Sr. However, as a new chronology technique, 40Ar/39Ar is rarely used in studying Huangling granite. In this study, the age of amphibole in metamorphic rocks and muscovite and biotite in Huanglingmiao granite has been determined by 40Ar/39Ar stage heating technique. The plateau age of amphibole was (835.1±0.8) Ma, and the plateau age of muscovite was (830.0±1.7) Ma. The biotite sample yielded an age spectrum with an upward convex shape, and no obvious flat section was formed. It was concluded that the age of amphibole is much lower than the formation age and metamorphic age of metamorphic rocks, but slightly higher than the muscovite age of nearby granite, indicating the time when the surrounding rock was reset by granite baking and then cooled to 500 ℃. The muscovite age indicates the time Huangling granite cooled to 350 ℃. Both of them restrict the formation time of Huangling granite. Although no plateau age was obtained, the biotite sample gave a meaningful age of 216 Ma in the low-temperature steps, which probably indicates the occurrence time of thermal disturbance in the later stage. The collision and merging of the North China and Yangtze plates caused the slow uplift of the Huangling, and activity of the NNW-trending faults in the Huangling area, and caused the thermal effect enough to affect the Ar closure of the biotite. The high precision 40Ar/39Ar age provides accurate chronological support for determining the tectonic evolution history of Huangling granite.-
Key words:
- Huangling Granite /
- Huangling Uplift /
- 40Ar/39Ar dating /
- thermal events /
- geochemistry
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图 1 黄陵地区地质简图及采样点位置图(a, 据研究区1∶25万地质图)；研究区大地构造位置图(b，底图为DEM地形图)
Fig. 1. Geological sketch map of the Huangling Uplift and locations of sampling (a) and tectonic position of study area (b)
图 2 9531角闪石和5632白云母矿物的40Ar/39Ar年龄谱
图中阴影部分指示年龄坪：TFA为全熔年龄；WMA为坪阶段加权平均年龄，即坪年龄；FA为年龄谱初始阶段的年轻年龄
Fig. 2. 40Ar/39Ar age spectra of 9531 amphibole and 5632 muscovite
图 3 10SN7黑云母40Ar/39Ar年龄谱及反等时线图
图中IIA为反等时线年龄，40/36为样品捕获的空气氩比值
Fig. 3. 40Ar/39Ar age spectra and inverse isochron diagram of 10SN7 biotite
表 1 黄陵隆起同位素年代学数据整理
Table 1. Compilation of isotopic ages for igneous rocks and metamorphic rocks in the Huangling Uplift
岩性（岩石组合） 矿物 年龄(Ma) 年代学方法 解释 文献 辉绿岩脉 锆石 2 842±11 U-Pb 岩浆锆石年龄，TTG花岗岩的形成时间 [1] 2 949±7 2 900±10 2 557 变质作用发生时间 辉绿岩脉 锆石 3 037±21 U-Pb 岩浆锆石，TTG古侵入体的形成时间 [2] 2 913 结晶锆石，脉岩形成时间 2 511 变质锆石，构造热事件时间 角闪岩 锆石 1 865~3 242 U-Pb 岩浆锆石，TTG花岗岩多期侵入时间 [3] 2 583±240 变质锆石，变质事件事件 奥长花岗片麻岩 锆石 3 051±12 U-Pb 岩浆锆石，TTG古侵入体的形成时间 [4] 2 739±18 变质锆石，片麻岩改造变质时间 2 947±5 奥长花岗岩的侵入年龄 2 895~2 938 岩浆锆石受后期元素活动扰动的时间 1 992±16 指示后期改造年龄 2 903±10 奥长花岗岩岩浆的侵入年龄 2 727±8 锆石变质增生边部年龄，指示变质活动 2 901±8 锆石核部年龄，指示古侵入体年龄 片麻岩 全岩 2 728±118 Sm-Nd 变质岩改造变质时间 [5] 斜长角闪岩 全岩 2 742±83 变质岩改造变质时间 角闪斜长混合岩 锆石 2 830±30 U-Pb 角闪斜长混合岩的改造变质时间 [6] 2 866±12 Pb-Pb 角闪斜长混合岩的改造变质时间 钾质花岗岩 锆石 1 840±4 U-Pb 钾质花岗岩的侵入时间 1 851±237 Pb-Pb 钾质花岗岩的侵入时间 黑云斜长变粒岩 锆石 2 913±4 Pb-Pb 变质岩改造变质时间 变基性岩 锆石 2 940±8 Rb-Sr 变质岩改造变质时间 钾长花岗质片麻岩 锆石 1 803±30 U-Pb 变质岩遭受构造-热事件改造的时间 [7] 片麻岩 锆石 2 015±15 U-Pb 变质锆石，改造变质时间 [8] 2 153±28 岩浆锆石 2 283~2602 辉绿岩脉 锆石 1 852±11 U-Pb 指示基性岩脉的侵入时间 [9] 混合岩 锆石 2 916~2947 U-Pb 岩浆锆石，指示原岩的形成时间 [10] 混合岩 锆石 3 113~3253 U-Pb 锆石继承核，指示原岩的形成时间 奥长花岗片麻岩 锆石 2 858±25 U-Pb 岩浆锆石，指示原岩的形成时间 英云闪长质片麻岩 锆石 2 893±29 U-Pb 岩浆锆石，指示原岩的形成时间 变沉积岩 锆石 1 974±25 U-Pb 指示了构造热事件 砂岩 锆石 3 802±8 U-Pb 碎屑锆石年龄，记录扬子陆块几期主要的构造活动时间 3 145~3 309 2 901~2 976 1 928~1 961 733~830 黄陵庙花岗岩、花岗斑岩 锆石 821±2 U-Pb 岩套的成岩年龄 816±5 814±5 809±5 806±6 800±5 砂岩 锆石 3 119.6~3 507.5 U-Pb 碎屑锆石，指示岩浆作用时间 [11] 大老岭二长花岗岩 锆石 846±15 U-Pb 捕获成因锆石 [12] 794±7 结晶锆石，大老岭花岗岩侵入时间 746±10 新生锆石的形成年龄，或发生部分重置的年龄 三斗坪英云闪长岩 锆石 795±8 U-Pb 三斗坪花岗岩侵入时间 734±17 指示后期热事件 618±13 指示更晚期的热事件或Pb丢失 晓峰浅成花岗岩 锆石 871±18 U-Pb 捕获成因锆石 737±13 晓峰花岗岩的侵入时间 黑云母花岗闪长岩 黑云母 823±7 K-Ar 黄陵庙花岗岩形成时间 [13] 锆石 819±7 U-Pb 黄陵庙花岗岩形成时间 818±5 黄陵庙花岗岩形成时间 黄陵庙花岗岩 全岩 808±35 Rb-Sr 黄陵庙花岗岩形成时间 [14] 大老岭花岗岩 全岩 786±17 Rb-Sr 大老岭花岗岩形成时间 晓峰花岗岩 全岩 750±57 Rb-Sr 晓峰花岗岩形成时间 中粒闪长岩 全岩及组成矿物 805±4 Rb-Sr 黄陵隆起整酸性岩浆活动区域结束，
基本稳定的时间[15] 807±2 全岩 834±35 三斗坪闪长岩 锆石 832±12 U-Pb 三斗坪岩体的形成年龄 全岩及组成矿物 805±5 Rb-Sr 三斗坪岩体的Rb-Sr同位素体系封闭年龄 黄陵庙似斑状黑云母花岗闪长岩 锆石 819 U-Pb 黄陵庙花岗岩的形成时间 全岩及组成矿物 800±2 Rb-Sr 黄陵庙花岗岩的Rb-Sr同位素体系封闭年龄 花岗岩 黑云母 780~789 K-Ar 太平溪和黄陵庙花岗岩的K-Ar黑云母封闭年龄 [16] 角闪石 738~799 白云母 799 花岗伟晶岩脉 微斜长石、白云母 807±2 Rb-Sr 岩脉的侵入时间 花岗闪长岩脉 独居石 801±24 U-Pb 岩脉的侵入时间 花岗岩 锆石 837±7 U-Pb 花岗岩的侵入时间 [17] 层凝灰岩 锆石 724±12 U-Pb 指示两期岩浆环带的存在，较年轻年龄指示莲沱组顶界年龄 锆石 787±7 三斗坪花岗岩 角闪石 844.0±4.2 40Ar/39Ar 三斗坪花岗岩的形成时间 [18] 辉长岩 锆石 857±11 U-Pb 岩石结晶年龄 [19] 橄榄辉长岩 锆石 854±14 U-Pb 岩石侵位年龄 三斗坪英云闪长岩 黑云母 838.7±4.0 40Ar/39Ar 黑云母封闭年龄 [20] 838.2±4.1 837.3±4.2 三斗坪英云闪长岩 角闪石 844.0±4.2 角闪石封闭年龄 黄陵庙花岗岩 锆石 815±9 U-Pb 黄陵庙岩套侵位时间 [21] 片麻岩 角闪石 835.1±0.8 40Ar/39Ar 角闪石受花岗岩侵入烘烤重置时间 本文 黄陵庙花岗岩 白云母 830.0±1.7 花岗岩冷却白云母封闭年龄 黑云母 216 花岗岩遭受后期热扰动时间 注：[1]赵敏等(2012)；[2]魏君奇等(2009)；[3]Wei et al.(2020)；[4]高山等(2001)；[5]凌文黎等(1998)；[6]袁海华等(1991)；[7]赵风清等(2006)；[8]Li et al.(2016)；[9]彭敏等(2009)；[10]Zhang et al.(2006a, 2006b, 2006c)；[11]柳小明等(2005)；[12]凌文黎等(2006)；[13]马国干等(1984)；[14]马大铨等(2002)；[15]冯定犹等(1991)；[16]李志昌等(2002)；[17]高维和张传恒(2009)；[18]周忠友等(2007)；[19]Jiang et al.(2018)；[20]李益龙等(2007)；[21]惠博等(2022); 年龄解释为对应文献中的解释 
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表 2 黄陵隆起样品信息
Table 2. Sample information of Huanglin Uplift
样品号 采样位置 纬度 经度 高程（m） 岩性 定年单矿物 9531 雾渡河镇花岩村 N31°06.542′ E111°11.386′ 580 片麻岩 角闪石 5632 莲沱镇莲沱大桥附近 N30°51.019′ E111°09.029′ 93 花岗岩 白云母 10SN7 雾渡河至下堡坪的公路旁 N31°04.898′ E111°09.456′ 990 花岗岩 黑云母
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