Geochronologic sequence of Neoproterozoic Tonian magmatism in Fanjingshan area, xiuning Country, Guizhou Province
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摘要:
为获得江南造山带西段梵净山地区新元古代拉伸纪岩浆的演化时序，为区域综合对比提供可靠的典型地区岩浆岩年代学研究基础资料，以及为梵净山申报地质公园提供详实的科普素材，对研究区新发现的辉绿岩体进行了年代学研究，获得该岩体U-Pb年龄为805.3±4.5Ma。通过对已有年龄数据的系统梳理与总结，认为梵净山群回香坪组内玄武岩的喷发结束时间为840Ma，存在831Ma、814~805Ma两次基性-超基性岩浆活动和855Ma、834Ma两次酸性岩浆活动。梵净山地区的新元古代拉伸纪岩浆活动时序可与黔东南—桂北地区对比。结合岩石类型及其地球化学特征，认为江南造山带西段拉伸早期岩浆岩的成因可能与扬子和华夏板块的俯冲碰撞有关，拉伸晚期岩浆岩的形成可能与华南大陆伸展裂陷有关。
Abstract:In order to obtain the geochronologic sequence of the Neoproterozoic magmatism in Fanjingshan area of the western Jiangnan Orogen and to provide a reliable foundation of chronological study in the typical area for comprehensive comparison and for geopark declaration and science popularization, the paper reports the zircon U-Pb dating of a newly discovered diabase in Fanjingshan area. The result shows that the diabase was formed at 805.3±4.5Ma. The authors also sorted and summarized the existing age reports in a comprehensive and systematic way, and hold that the end of the eruption of basalts was 840Ma. There were two periods of basic-ultrabasic magmatism (831Ma, 814~805Ma) and two periods of acid magmatism (855Ma, 834Ma) that occurred in Fanjingshan area during Neoproterozoic. The magmatic geochronology sequence of Fanjingshan area largely corresponds to that of southwest Guizhou-north Guangxi area. Combined with rock types and its geochemical features, it is implied that the Neoproterozoic Early Tonian magmatic rocks in western part of Jiangnan Orogen were formed by the subduction-collision process of Yangtze and Cathaysia blocks, and the Late Tonian magmatic rocks were formed by the rifting process of South China Craton.
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Key words:
- Jiangnan Orogen /
- Wuling movement /
- Banxi Group /
- diabase /
- zircon U-Pb dating /
- geopark
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表 1 梵净山地区已有岩浆岩年龄统计
Table 1. Statics of ages of magmatic rocks in Fanjingshan area
样品编号 位置 坐标 层位 岩性 定年方法 206Pb/238U年龄加权平均值 来源 Fjs-16 - N27°51'48.5"、
E108°45'38.6"梵净山群回香坪组 玄武岩 LA-ICP-MS 814±15Ma*(n=6, MSWD=0.57) [17] Fjs-07-2 - N27°51'59.2"、
E108°45'38.6"梵净山群回香坪组 辉长岩 LA-ICP-MS 827±24Ma(n=4，MSWD=0.12) [17] Fjs-09-2 - N27°51'57.3"、
E108°45'24.3"梵净山群回香坪组 辉绿岩 LA-ICP-MS 831±6Ma(n=22, MSWD=0.16) [17] Fjs-24 - N27°54'53.8"、
E108°38'08.8"梵净山群肖家河组 辉长辉绿岩 LA-ICP-MS 814±6Ma(n=8，MSWD=0.45) [17] F1047-5 公园佛堂前 N27°51.144'、
E108°45.998'梵净山群回香坪组 凝灰岩 SHRIMP 840.0±5Ma(n=17，MSWD=1.5) [22] 100831-7 登山路旁边 N27°54.057'、
E108°42.215'梵净山群回香坪组 辉长岩 LA-ICP-MS 748±2Ma(n=10，MSWD=0.16) [27] 100902-1A 烂茶坪 N27°58.567'、
E108°41.223'梵净山群淘金河组 辉长岩内部 LA-ICP-MS 804±5Ma(n=14，MSWD=0.24) [27] 100902-1D 烂荼坪 N27°58.567'、
E108°41.223'梵净山群淘金河组 辉长岩边部 LA-ICP-MS 813±8Ma(n=7，MSWD=0.19) [27] 100830-1C 鱼坳 N27°53.648'、
E108°43.274'梵净山群铜厂组 沉凝灰岩 LA-ICP-MS 832.0±8.5Ma(n=11，MSWD=6.5) [28] 090928-2B 护国寺 N27°55.020'、
E108°38.000'梵净山群肖家河组 辉绿岩 LA-ICP-MS 856.3±4.5Ma(n=4，MSWD=0.0024) [29] 100509-2A 桃树林北 N27°59.585'、
E108°41.266'梵净山群余家沟组 凝灰岩 LA-ICP-MS 851.3±4.0Ma(n=20，MSWD=1.5) [28] 100408-2B2 保庆堂 N27°59.680'、
E108°41.067'板溪群芙蓉坝组 花岗岩砾石 LA-ICP-MS 855.1±1.5Ma(n=23，MSWD=1.6) [29] FJS16 - N27°54'45"、
E108°39'49"梵净山群下部 凝灰岩 SIMS 830.8±4.4Ma(n=7，MSWD=2.1) [30] FJS39 - N27°54'29"、
E108°39'10"梵净山群下部 火山碎屑岩 SIMS 827±15Ma(n=10，MSWD=3.0) [30] FG7 桃树林 N27°59'01"、
E108°41'24"梵净山群淘金河组 白云母花岗岩 SIMS 827.5±7.4Ma(n=10，MSWD=1.7) [30] T0731 金顶下1.6 km N27°55'03.6"、
E108°40'41.8"梵净山群回香坪组 火山集块岩 SHRIMP 840±11Ma(n=12，MSWD=0.86) [31] T090420a 桃树林 N27°59.026',
E108°41.403'梵净山群淘金河组 白云母花岗岩 LA-ICP-MS 838.5±1.5Ma(n=14，MSWD=11.1) [32] F1048-1B-2 桃树林 N27°59.025'、
E108°41.401'梵净山群淘金河组 白云母花岗岩 SHRIMP 835±5Ma(n=15，MSWD=1.2) [33] T09419-5 公园大门 N27°50.821'、
E108°46.211'板溪群甲路组 凝灰岩 LA-ICP-MS 814.0±6.3Ma(n=17，MSWD=1.5) [34] FJS-387A - - 梵净山群 辉长岩 SHRIMP 821±4Ma(n=15，MSWD=1.3) [35] HS24 - N28°01'58.6"、
E108°41'37.0"板溪群 英安岩 LA-ICP-MS 805.8±1.6Ma(n=14，MSWD=0.24) [36] JIA 平所村 N27°59'13.4"、
E108°40'34.6"板溪群甲路组 辉绿岩 LA-ICP-MS 805.3±4.5Ma(n=14,MSWD=0.043) 本次研究 注:*代表207Pb/206Pb年龄加权平均值 
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表 2 梵净山地区辉绿岩LA-ICP-MS锆石U-Th-Pb同位素比值及年龄
Table 2. LA-ICP-MS zircon U-Th-Pb dating results for diabase in Fanjingshan area
编号 Th /10-6 U /10-6 Th/U 207Pb/235U比值 207Pb/235U 1σ 206Pb/238U比值 206Pb/238U 1σ 207Pb/235U年龄/Ma 207Pb/235U 1σ 206Pb/238U年龄/Ma 206Pb/238U 1σ 谐和度 岩浆锆石 JIA-02 619 442 1.40 1.2552 0.0305 0.1328 0.0016 826 14 804 9 97% JIA-06 286 287 1.00 1.2234 0.0315 0.1330 0.0017 811 14 805 10 99% JIA-07 288 658 0.44 1.2679 0.0258 0.1330 0.0016 831 12 805 9 96% JIA-08 658 564 1.17 1.2590 0.0296 0.1328 0.0014 827 13 804 8 97% JIA-10 126 175 0.72 1.2341 0.0396 0.1327 0.0018 816 18 803 10 98% JIA-12 2693 904 2.98 1.2289 0.0259 0.1331 0.0014 814 12 805 8 98% JIA-13 1911 1063 1.80 1.2333 0.0228 0.1333 0.0013 816 10 807 7 98% JIA-16 118 248 0.47 1.2547 0.0302 0.1338 0.0017 826 14 809 10 98% JIA-17 104 372 0.28 1.2575 0.0283 0.1335 0.0013 827 13 808 8 97% JIA-18 1637 782 2.09 1.2362 0.0279 0.1329 0.0015 817 13 804 9 98% JIA-19 769 497 1.55 1.2669 0.0287 0.1327 0.0015 831 13 803 9 96% JIA-20 3298 2108 1.56 1.2428 0.0282 0.1330 0.0015 820 13 805 9 98% JIA-21 518 400 1.30 1.2128 0.0299 0.1333 0.0013 806 14 807 7 99% JIA-22 54 239 0.23 1.2367 0.0364 0.1328 0.0019 817 17 804 11 98% 捕获锆石 JIA-01 64 91 0.70 2.4247 0.0969 0.2211 0.0026 1250 29 1288 14 97% JIA-03 277 504 0.55 3.3343 0.0721 0.2526 0.0032 1489 17 1452 16 97% JIA-04 268 378 0.71 1.2912 0.0324 0.1392 0.0014 842 14 840 8 99% JIA-05 616 497 1.24 1.2752 0.0297 0.1387 0.0017 835 13 837 9 99% JIA-09 115 398 0.29 3.2740 0.0737 0.2510 0.0030 1475 18 1444 15 97% JIA-11 194 370 0.52 1.3677 0.0327 0.1453 0.0018 875 14 875 10 99% JIA-14 134 80 1.67 5.8957 0.1289 0.3312 0.0045 1961 19 1844 22 93% JIA-15 1 353 0.00 2.0986 0.0461 0.1895 0.0016 1148 15 1119 9 97% JIA-23 288 680 0.42 1.2744 0.0360 0.1405 0.0032 834 16 847 18 98% 注:谐和度=100×(1-abs(206Pb/238U Age-207Pb/235U Age)/((206Pb/238U Age+207Pb/235U Age)/2))
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① 中国国土资源航空物探遥感中心.黔东地区重点航磁异常研究报告. 2016.
② 贵州一〇八地质队第三分队.贵州省梵净山区1: 50000区域地质调查报告. 1974.
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