Geochronology Study and Geological Significance of Cobalt-Nickel-Rich Albite Breccia in the Fengxian-Shanyang, Qinling Orogenic Belt
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摘要:
秦岭造山带内沿凤县–山阳断裂两侧分布大面积钠长角砾岩,这些钠长角砾岩的钴、镍等元素含量普遍较高,因此具有良好的研究价值。笔者通过野外地质考察发现与钠长岩有关的镍钴矿床、矿化点共6处(商南县博鱼沟钠长角砾岩、商南县过凤楼白云石钠长角砾岩、商南县开河白云石钠长角砾岩、商南县开河铁白云石方解石钠长角砾岩、山阳县桐木沟铁白云石钠长角砾岩和柞水县凤凰镇水滴沟白云石钠长角砾岩)。对此开展系统的岩石学、锆石U-Pb年代学和锆石微量元素研究,研究表明:这些富钴–镍钠长角砾岩主要呈浅灰白色和青灰色,块状构造,可见角砾状构造,部分区域可见黄铁矿、方解石、石英及钠长石脉。钠长角砾岩样品的锆石多呈现自形–半自形,年龄集中分布在375~543 Ma、665~959 Ma和963~
1155 Ma,其年龄峰值分别对应早泥盆世、志留纪、奥陶纪、新元古代、中元古代、古元古代。综合研究表明,这些富钴–镍的钠长角砾岩年龄和该区泥盆系地层年龄一致,不同时期壳源沉积物对泥盆纪钠长角砾岩沉积过程均有贡献,成岩后期的岩浆–热液作用对镍–钴矿有明显的富集作用,综上所述,研究区出露的钠长角砾岩具有钴–镍矿化的潜力。Abstract:In the Fengxian-Shanyang, Qinling orogenic belt, there are large amounts of albites breccia that show the obvious enrichment of cobalt and nickel elements, which therefore are important for the ore probe. In this paper, a total of 6 albite breccia related to Co-Ni deposits and mineralization points have been found through field geological investigation (Boyugou albite breccia in the Shangnan County, Guofenglou dolomite-bearing albite breccia in the Shangnan County, Kaihe dolomite-bearing albite breccia in the Shangnan County, Kaihe iron-dolomite- and calcite-bearing albite breccia in the Shangnan County, Tongmugou iron-dolomite-bearing albite breccia in the Shanyang County and Shuidigou dolomitbearing albite breccia in the Fenghuang Town of the Zhashui County). Systematic studies of petrology, zircon U-Pb chronology, and zircon trace elements display that these cobalt-nickel-rich albite breccia are mainly grayish white and bluish gray with massive structure and brecciated structure, and some areas occasionally exist the pyrite, calcite, quartz and albite veins. The zircons of albite breccia are mostly idiomorphic and semi-idiomorphic, and their ages are concentrated in 375~543 Ma, 665~959 Ma, and 963~
1155 Ma. Their age peaks are corresponding to the Early Devonian, Silurian, Ordovician, Neoproterozoic, Mesoproterozoic, and Paleoproterozoic. The comprehensive studies demonstrate that the zircon ages of these cobalt-nickel-rich albite breccia are consistent with the age of Devonian strata. Crust-derived sediments of different periods are contributed to the sedimentary process of Devonian albite breccia, and the later magmatic -hydrothermal processes are responsible for the enrichment of nickel-cobalt breccia deposits. In conclusion, the albite breccia exposed in the study area has the potential for cobalt-nickel mineralization. -
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图 4 秦岭造山带凤县-山阳地区富钴-镍钠长岩(6个样品)锆石稀土元素标准化配分模式图(据Sun et al. 1989)
Figure 4.
表 1 秦岭造山带富钴–镍钠长角砾岩及其围岩Co、Ni等元素光谱分析结果统计表
Table 1. Statistical table of spectral analysis results of Co, Ni and other elements in Cobalt-Nickel-rich albites and its surrounding rocks in the Fengxian-Shanyang area, Qinling Orogenic Belt
岩石类型
(件数)Co Ni Cu Pb Zn Au Ag Ga Cd 地层围岩
(75)4.47~75.9
(19.76)3.6~202
(47.21)4.4~ 10350
(175.91)1.1~509.1
(30.65)4.8~440
(40.07)0.49~216.06
(11.53)29~ 5352
(180.62)7.03~24.5
(16.34)0.02~28.4
(1.32)层状钠
长岩
(21)1.43~35
(10.55)3.45~94.3
(26.01)3.86~769
(49.50)1.01~147
(19.70)7.25~283
(52.90)0.35~92.5
(7.17)30~ 2712
(251.64)4.31~30.1
(13.30)0.03~4.98
(0.64)钠化岩石
(13)5.17~25.60
(13.74)9.21~57.60
(31.03)2.71~1 821
(252.08)1.46~83.44
(15.07)3.18~79
(21.56)0.37~58.70
(7.53)20.91~71.00
(40.39)4.58~24.90
(14.96)0.01~0.16
(0.06)钠长角
砾岩
(112)2.03~1 833
(91.71)5.19~ 99340
(1365.54 )1.23~1 821
(59.81)0.63~ 2323.33
(33.48)2.12~276
(23.57)0.32~936
(29.69)29~ 2165
(104.01)1.69~33.30
(13.74)0~3.79
(0.24)脉体
(24)3.65~102.81
(22.75)17.70~88.8
(127.23)1.2~ 2470
(168.25)1.08~56.60
(11.76)5.16~144
(46.55)0.52~46.20
(5.22)28.67~264
(83.37)2.56~22.40
(11.08)0.02~0.57
(0.18)原始地幔 100 2000 28 120 50 1.3 19* 3 40* 大陆地壳 29 105 75 80 80 3.0* 80* 18 98* 上陆壳 10 20 25 20 71 1.8* 50* 17 98* 下陆壳 35 135 90 4.0 83 3.4* 90* 18 98* 注:*元素含量为10−9,其余元素含量为10−6;原始地幔及大陆地壳数据引自(Taylor, 1985)。 表 2 秦岭造山带凤县–山阳地区钠长角砾岩及其镍钴矿岩石光谱分析结果
Table 2. Spectral analysis results of albite breccia and its nickel-cobalt ore rock in the Fengxian-Shanyang area, Qinling Orogenic Belt
样品编号 样品名称 Ag Au Co Cu Ga Ni Pb Zn Cd (10−9) (10−9) (10−6) (10−6) (10−6) (10−6) (10−6) (10−6) (10−6) BGD1-GP1 浅灰色细晶灰岩 30 0.85 16.6 13.6 12.9 35.8 2.74 26.7 0.05 BGD1-GP2 褐铁矿化变粉砂岩 46 1.06 12.9 83.4 18.9 58 2.81 161 0.2 FD11-GP1 蚀变黄铁矿化钠长岩 30 0.91 6.33 3.86 16.4 12.8 2.93 283 1.03 FD12- GP1 蚀变钠长岩 41 1.47 11.1 6.18 9.76 18.3 2.67 160 0.53 BGD3-GP1 青灰色钠化板长岩 30 58.7 8.41 1821 24.9 23.1 1.6 7.32 0.02 BGD6-GP1 青灰色蚀变钠化板岩 32 0.45 8.87 4.29 17 24.8 1.77 3.18 0.02 FD6- GP1 钠长角砾岩 53 1.27 10.5 1.23 7.52 25.5 6.22 276 1.02 BGD2-GP1 镜铁矿化钠长角砾岩 42 5.46 31.1 12.3 21.9 41.9 3.64 15.7 0.1 BGD3-GP3 青灰色蚀变钠长角砾岩 30 0.35 11.7 6.11 13.1 8.6 1.23 4.49 0.02 BGD4-GP1 褐铁矿化钠长角砾岩 29 0.72 17.7 11.4 20.7 66.3 2.05 11.5 0.06 BGD8-GP1 褐铁矿化钠长角砾岩 33 0.4 16.3 7.33 20.5 23.9 2.32 2.87 0.02 BGD11-GP1 青灰色钠长角砾岩 34 0.56 18.9 4.07 18.1 19.4 1.81 2.12 0.01 BGD11-GP2 青灰色钠长角砾岩 32 0.43 8.55 3.65 16.6 14.1 3.2 4.57 0.02 FD13-GP1 矿化铁碳酸盐岩脉 222 9.41 10.9 1821 5.08 36.5 9.3 233 0.9 BGD9-GP1 铁白云石石英脉 41 1.83 14.8 46.3 11 27.7 7.46 26.5 0.05 BGD10-GP1 铁碳酸盐岩脉 31 0.52 17.8 45 2.64 42.5 2.6 5.16 0.02 表 3 秦岭造山带凤县−山阳地区钠长角砾岩产出特征表
Table 3. Characteristics of albite breccia in the Fengxian-Shanyang area, Qinling orogenic belt
区段 位置 构造 层位及围岩 规模 形态 产状 角砾特征 胶结物 类型 矿化 长(km) 宽(m) 成分 形状 块度 镇安县二台子–山阳县桐木沟 镇安县二台子桥梓沟到东甘沟 小磨岭复式背斜南翼的复杂褶皱带内 古道岭与星红铺组界面上下,灰岩、白云质灰岩、白云质千枚岩 4 1200 透镜状、局部脉状,由多个层间透镜体组成,单个角砾岩体长数十米到数百米 主要受层间断裂控制,亦有沿EW向断裂产出。总体走向270°~300°,倾向SWW,倾角变化不一。一般为50°~85° 白云岩、板岩、结晶灰岩、大理岩、铁白云石钠长岩、钠长石铁白云岩,粉砂岩及含黄铁矿绢云板岩、含黄铁矿粉砂、泥质白云岩等 一般为似球状、卵状、次棱角不规则状、少许棱角状 多为0.5~2 cm,小者数毫米,大者5~50 cm,大于50 cm者极少 主要为铁白云石,次为方解石、石英、钠长石、重晶石 以脉状钠长岩为主,此外钠长角砾岩 二台子中型铜金矿 柞水县凤镇南飞星沟到
水滴沟圪塔寺–水滴沟复向斜 九里坪组千枚岩、绢云板岩、绿泥绢云板岩、白云质绢云板岩、白云质粉砂岩、钠长
板岩7 2500 透镜状、似层状、脉状、由多条平行的角砾岩体构成、长数百米至
2 000 m、宽数米至40 m总体走向300°,产状不十分清楚,有顺层及穿层现象 千枚状绢云板岩、白云质粉砂岩、钠长板岩类(铁白云石钠长板岩、铁白云石石英钠长板岩、石英铁白云石岩)、方柱石角岩 多呈卵状,次棱角的条纹状及少量棱角明显的块状 一般5~10 cm,小者数毫米,大者50 cm 主要为铁白云石,次为石英、方解石、钠长石、白云母、绢云母 以钠化岩石为主,次为钠长角砾岩、脉状钠长岩 镇安县二台子–山阳县桐木沟 柞水县凤镇南宽坪乡到大寺沟脑 㞰峪沟–色河铺复向斜北翼 九里坪组绿泥绢云板岩、白云质灰岩 10 1000 似层状、透镜状,单个角砾岩体长数千米,宽10~300 m 走向280°,产状不清 白云质灰岩、绢云板岩、粉砂岩、钠长板岩类(铁白云石钠长板岩、含钠长石铁白
云岩)一般为卵状、似球状、次棱角条纹状及不规则状 多为1~15 cm,小者数毫米,大者50 cm 以铁白云石为主,次有方解石、石英、钠长石、重晶石 钠化岩为主,次为钠长角砾岩及脉状钠长岩 镇安县
大坪乡㞰峪沟–色河铺复向斜南翼 九里坪组绢云板岩、铁白云质绢云板岩、薄层灰岩、粉砂岩 7 0~10 扁豆状、单体规模小,长二百多米 产状与地层一致,走向近EW,其东部随地层转为SN向 灰岩、微晶白云岩、绢云板岩、粉砂岩、碳质绢云板岩、铁白云质钠长岩、角砾含量30%~60% 棱角明显的不规则状、板状 一般为5~20 cm, 最大者一米 主要为铁白云石、方解石,次为石英、钠长石、绢云母岩粉、黄铁矿 脉状钠长岩,钠长角砾岩 金矿化较弱 西起东坪乡笊篱沟,经车房沟,皂河东沟,东到肖台大水沟继续向东延伸 蔡玉窑–西芦山复式向斜
南翼池沟组粉砂质绢云板岩、铁白云质绢云板岩,绢云千枚岩,泥砂质白云岩、白云质钠长板岩 22 1200 似层状,透镜状,由多个角砾岩体组成,长数百米至数千米,宽数米至20 m 与岩层产状一致,呈NWW向延伸,总体产状10°~30°∠40°~
60°,各角砾岩体之间呈断续线状分布绢云板岩、绢云千枚岩、白云质粉砂岩、泥砂质白云岩、铁白云质钠长岩、方柱石角岩, 钠长细晶灰岩、石英钠长岩 棱角明显的条纹状,不规则状,亦有卵状 一般为1~8 cm,小者数毫米,大者数米 铁白云石、白云石、方解石、石英、黑云母、绿泥石、
钠长石沉积层状钠长岩、钠化岩石为主,次为钠长角砾岩,脉状钠长岩 金矿化较弱 镇安县二台子–山阳县桐木沟 柞水县凤镇万丈沟到金钱河蛇形地 蔡窑–西芦山复式向斜三南翼 牛耳川组 5 100 透镜状,由多个角砾岩体组成,长数十至数百米 与岩层产状一致,受层控制,产状20°~30°
∠50°~60°,角砾岩与碎裂岩混杂产出粉砂质绢云板岩,粉砂岩,白云质钠长板岩、钠长石白云岩,黄铁矿块 次棱角状、不规则状, 卵状 1~10 cm为主,小者数毫米,大者50~
100 cm含铁白云石、白云石、方解石、石英、钠长石 钠化岩石为主,次为钠长角砾岩,脉状钠
长岩镍钴矿、金矿、
铜矿山阳县色河铺干沟到板板山 㞰峪沟–色河铺复向斜东围合部位的干沟背斜两翼 绢云板岩、铁白云质绢云板岩、微晶白云岩、泥灰岩、粉砂岩、砂岩、含碳质板岩 14 1500 ~3500 多呈不规则脉状,似层状,有分枝,复合及胀缩现象,单体者200~500 m,长10 km 总体走向为EW,单体有NW和NE向者,且将EW方向者串通,走向随地层而转,倾向多切穿地层,产状十分复杂 主要为灰质砂岩、铁白云质粉砂绢云板岩、含碳板岩、粉砂岩、泥灰岩、白云岩。次为白云母石英片岩、白云斜长片岩、石英岩、钠长岩、角砾含量15%~30% 不规则棱角状、板状 多为1~10 cm,大者为巨大的块状,小者数毫米 主要为铁白云石、方解石,次为石英、岩粉、黄铁矿等 以钠长角砾岩、钠化岩石为主,次为脉状钠
长岩金矿化弱 山阳县晚阳沟–小西沟–桐木沟 野人沟–九岔沟复背斜及黄土包–崖家庄背斜北翼 晚阳沟–碾盘断裂带充填在青石垭组和池沟组之间绢云母板岩、粉砂质绢云母板岩、粉砂岩、铁白云岩及钠长岩 25 5~700 脉状、沿断裂带断续产出,单体大者长4 km,宽200 m 总体走向近EW向,倾角与地层基本
一致主要为砂质板岩、砂质灰岩、砂岩、绢云板岩、钠长岩,次为千枚岩、角岩化岩石,九岔沟以东出现钠长岩角砾,其西以碳酸盐岩为主,角砾含量为30%~45%,最多65% 不规则次棱角状, 浑园状及板状 一般为5~30 cm,局部有岩块 铁白云石、石英、方解石、白云母、钾长石、钠长石、黑云母、方柱石、黄铁矿、磷灰石、锆石、电气石 以层状钠长岩、钠长角砾岩及钠化岩石为主,见脉状钠长岩 锌矿 山阳县中村–商南县过风楼 山阳县高坝到中村 两岭街–竹林关背斜南翼,沿高坝–竹林关–青山断裂带北侧分布 高坝–银花主要赋存于牛耳川组及池沟组,岩性主要为铁白云质绢云板岩、铁白云质粉砂岩、千枚岩、绢云板岩、白云岩、钠长板岩 18 1000 ~2000 由大小不等的9个平行排列的脉状体组成。长数十米到8 km,宽1~300 m 走向NWW-SEE,与地层一致,倾向10°~30°,倾角50°~60°,与地层基本
一致铁白云质粉砂岩、铁白云质绢云板岩及千枚岩、铁白云岩,粉砂岩,少量钠长岩类。角砾含量15%~60% 不规则次棱角状,浑圆状 多为1~15 cm,局部含较多的碎裂岩块 主要为铁白云石、方解石,次为石英、钠长石、少量的黄铁矿、微量磷灰石、锆石、电气石、金红石、黄铜矿、黝铜矿 以钠化岩石为主,次为脉状钠长岩、钠长角砾岩 丹凤竹林关到商南县
青山单斜构造,沿竹林关–青山断裂南侧分布 赋存于星红铺组,岩性主要为粉砂质绢云板岩、变粉砂岩、薄层泥质灰岩 58 100~ 1000 脉状、似层状,单个角砾岩体长度不详、其厚度一般小于20 m 走向延伸与地层一致,为EW向,倾向10°~360°,倾角50°~70° 铁白云质钠长板岩、钠长板岩、含石英绢云钠长板岩等为主,次有少量粉砂岩、绢云板岩、大理岩、二云片岩等。角砾含量10~50% 不规则次棱角状, 浑圆状 一般为2~10 cm,少量可达数十厘米,小者为岩屑 主要为铁白云石,次为钠长石、方解石、石英,微量黄铁矿、黑云母,有些地段有大量的晚期镜铁矿脉穿插或胶结 以钠长角砾岩、钠化岩石为主,次为脉状钠
长岩商南开河、商南过风楼2处钴矿点;韭菜沟中型金矿,多处金矿化点 表 4 秦岭造山带凤县–山阳地区钠长角砾岩(BGD11) LA-ICP-MS锆石U-Pb同位素测试结果
Table 4. LA-ICP-MS zircon U-Pb isotope results of albite breccia (BGD11) in the Fengxian-Shanyang area, Qinling Orogenic Belt
点号 含量(10−6) Th/U 同位素比值 年龄(Ma) Th U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 59 47 1.25 0.3555 0.0076 6.0961 0.1415 0.1244 0.0028 1961 36 1990 20 2020 18 2 219 192 1.14 0.0652 0.0014 0.5052 0.0131 0.0562 0.0014 407 8 415 9 459 26 3 197 235 0.84 0.1318 0.0028 1.2223 0.0280 0.0673 0.0015 798 16 811 13 846 21 4 192 181 1.06 0.0729 0.0016 0.5872 0.0175 0.0584 0.0017 454 9 469 11 545 31 5 185 809 0.23 0.0838 0.0018 0.7628 0.0165 0.0660 0.0014 519 10 576 10 807 20 7 84 148 0.57 0.1163 0.0025 1.0925 0.0261 0.0681 0.0016 709 14 750 13 872 22 8 217 313 0.69 0.1132 0.0024 1.0742 0.0243 0.0688 0.0015 691 14 741 12 893 21 9 103 246 0.42 0.3403 0.0072 5.0391 0.1074 0.1074 0.0022 1888 34 1826 18 1755 18 11 319 345 0.92 0.0689 0.0015 0.5290 0.0125 0.0557 0.0013 430 9 431 8 439 24 12 84 628 0.13 0.0745 0.0016 0.5764 0.0175 0.0562 0.0021 463 9 462 11 458 84 13 112 183 0.61 0.2924 0.0066 4.1431 0.1540 0.1028 0.0045 1653 33 1663 30 1675 82 14 122 135 0.90 0.4670 0.0099 10.4168 0.2221 0.1618 0.0033 2471 44 2473 20 2474 16 15 105 224 0.47 0.0733 0.0016 0.5646 0.0138 0.0559 0.0013 456 9 454 9 447 24 18 109 162 0.67 0.1308 0.0028 1.1833 0.0284 0.0656 0.0015 793 16 793 13 793 22 19 88 113 0.78 0.1159 0.0025 0.9759 0.0247 0.0611 0.0015 707 14 692 13 641 24 20 415 455 0.91 0.0671 0.0014 0.5176 0.0122 0.0560 0.0013 418 9 424 8 452 23 21 137 211 0.65 0.0722 0.0016 0.5565 0.0138 0.0559 0.0013 449 9 449 9 449 25 22 58 191 0.30 0.1100 0.0024 0.9380 0.0229 0.0619 0.0015 673 14 672 12 669 23 23 324 300 1.08 0.1392 0.0030 1.3061 0.0292 0.0680 0.0015 840 17 848 13 870 21 26 217 338 0.64 0.0728 0.0016 0.5817 0.0138 0.0579 0.0013 453 9 466 9 527 23 27 252 494 0.51 0.0672 0.0014 0.5317 0.0125 0.0574 0.0013 419 9 433 8 507 23 28 151 333 0.45 0.1611 0.0034 1.5780 0.0347 0.0710 0.0015 963 19 962 14 958 20 30 214 755 0.28 0.0687 0.0015 0.5265 0.0119 0.0556 0.0012 428 9 430 8 436 23 表 5 秦岭造山带凤县–山阳地区钠长角砾岩(FD6) LA-ICP-MS锆石U-Pb同位素测试结果
Table 5. LA-ICP-MS zircon U-Pb isotope results of albite breccia (FD6) in the Fengxian-Shanyang area, Qinling Orogenic Belt
点号 含量(10−6) Th/U 同位素比值 年龄(Ma) Th U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 81 256 0.32 0.0770 0.0016 0.6004 0.0140 0.0566 0.0013 478 10 478 9 474 23 2 98 188 0.52 0.3176 0.0066 4.7441 0.1003 0.1084 0.0022 1778 32 1775 18 1772 18 3 241 236 1.02 0.0692 0.0015 0.5022 0.0120 0.0527 0.0012 431 9 413 8 315 24 4 76 99 0.77 0.1153 0.0025 1.0296 0.0283 0.0648 0.0018 703 14 719 14 767 27 5 128 72 1.78 0.2524 0.0054 3.2250 0.0761 0.0927 0.0022 1451 28 1463 18 1481 20 6 545 403 1.35 0.1299 0.0027 1.1929 0.0258 0.0666 0.0014 787 15 797 12 826 20 7 208 313 0.66 0.0732 0.0015 0.5576 0.0129 0.0553 0.0013 455 9 450 8 423 23 8 327 472 0.69 0.0675 0.0014 0.5233 0.0117 0.0562 0.0012 421 9 427 8 461 22 9 126 276 0.46 0.2905 0.0060 3.9560 0.0816 0.0988 0.0020 1644 30 1625 17 1601 18 10 274 471 0.58 0.0728 0.0015 0.5453 0.0120 0.0544 0.0012 453 9 442 8 386 22 11 162 321 0.50 0.0681 0.0015 0.5085 0.0311 0.0542 0.0035 425 9 417 21 378 151 12 136 440 0.31 0.1308 0.0027 1.1796 0.0250 0.0654 0.0014 792 15 791 12 788 20 13 368 476 0.77 0.0696 0.0015 0.5289 0.0121 0.0551 0.0012 434 9 431 8 417 23 14 117 158 0.74 0.0667 0.0014 0.5030 0.0128 0.0547 0.0014 416 8 414 9 399 26 15 231 261 0.89 0.1167 0.0027 1.0355 0.0647 0.0644 0.0043 711 15 722 32 754 145 16 6 322 0.02 0.2847 0.0059 3.9155 0.0823 0.0997 0.0021 1615 30 1617 17 1619 18 17 127 166 0.77 0.1237 0.0026 1.1546 0.0277 0.0677 0.0016 752 15 779 13 859 22 18 150 337 0.44 0.1755 0.0036 1.8078 0.0395 0.0747 0.0016 1043 20 1048 14 1060 20 19 378 484 0.78 0.0657 0.0014 0.4980 0.0114 0.0550 0.0012 410 8 410 8 412 23 20 1023 646 1.58 0.0577 0.0012 0.4440 0.0099 0.0558 0.0012 362 7 373 7 444 22 21 97 178 0.55 0.1158 0.0026 1.0881 0.0518 0.0682 0.0036 706 15 748 25 874 112 22 76 95 0.80 0.4728 0.0098 10.6874 0.2267 0.1639 0.0034 2496 43 2496 20 2496 16 23 193 322 0.60 0.0728 0.0015 0.5617 0.0140 0.0560 0.0014 453 9 453 9 450 25 24 114 237 0.48 0.2132 0.0044 2.4332 0.0535 0.0828 0.0018 1246 23 1252 16 1264 19 25 181 227 0.80 0.0653 0.0014 0.5109 0.0128 0.0568 0.0014 408 8 419 9 482 25 26 87 127 0.68 0.0879 0.0018 0.7023 0.0182 0.0580 0.0015 543 11 540 11 528 26 27 68 186 0.36 0.1353 0.0029 1.2495 0.0469 0.0670 0.0029 818 16 823 21 838 92 28 57 148 0.38 0.3482 0.0072 5.6759 0.1207 0.1182 0.0025 1 926 34 1 928 18 1 929 17 29 192 415 0.46 0.0663 0.0014 0.5289 0.0233 0.0578 0.0028 414 9 431 15 523 110 30 61 138 0.44 0.1652 0.0034 1.6494 0.0384 0.0724 0.0017 986 19 989 15 997 21 表 6 秦岭造山带凤县-山阳地区钠长角砾岩(FD13) LA-ICP-MS锆石U-Pb同位素测试结果
Table 6. LA-ICP-MS zircon U-Pb isotope results of albite breccia (FD13) in Fengxian-Shanyang area, Qinling Orogenic Belt
点号 含量(10−6) Th/U 同位素比值 年龄(Ma) Th U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 58 128 0.45 0.1459 0.0031 1.3581 0.0335 0.0675 0.0016 878 17 871 14 854 23 2 140 187 0.75 0.1518 0.0032 1.5139 0.0353 0.0723 0.0016 911 18 936 14 995 21 3 166 122 1.36 0.1193 0.0025 1.1165 0.0274 0.0679 0.0016 726 14 761 13 865 23 4 258 282 0.91 0.1327 0.0028 1.1950 0.0268 0.0653 0.0014 803 16 798 12 784 21 5 86 440 0.19 0.1401 0.0029 1.2986 0.0287 0.0672 0.0014 845 17 845 13 845 21 6 154 350 0.44 0.1455 0.0030 1.3374 0.0304 0.0667 0.0015 876 17 862 13 827 21 7 142 154 0.93 0.1748 0.0037 1.7342 0.0391 0.0719 0.0016 1039 20 1021 15 984 21 8 185 386 0.48 0.1204 0.0025 1.1390 0.0251 0.0686 0.0015 733 14 772 12 888 20 9 96 213 0.45 0.1781 0.0037 1.7893 0.0398 0.0729 0.0016 1057 20 1042 15 1010 20 10 58 336 0.17 0.1888 0.0039 1.9874 0.0427 0.0763 0.0016 1115 21 1111 15 1104 19 11 289 577 0.50 0.1120 0.0023 1.0218 0.0221 0.0662 0.0014 684 14 715 11 811 20 12 224 208 1.07 0.1951 0.0041 2.1078 0.0458 0.0783 0.0016 1149 22 1151 15 1155 19 13 313 351 0.89 0.0689 0.0015 0.5537 0.0130 0.0583 0.0013 429 9 447 8 541 23 15 89 125 0.71 0.1389 0.0029 1.2933 0.0305 0.0675 0.0016 838 17 843 14 854 22 16 149 140 1.07 0.1198 0.0025 1.0491 0.0250 0.0635 0.0015 730 15 728 12 725 23 20 52 106 0.49 0.1799 0.0038 1.9537 0.0446 0.0788 0.0018 1066 21 1100 15 1167 20 21 90 316 0.28 0.0977 0.0021 0.8055 0.0186 0.0598 0.0013 601 12 600 10 595 22 22 159 269 0.59 0.1559 0.0033 1.4998 0.0322 0.0698 0.0014 934 18 930 13 922 20 23 32 244 0.13 0.1456 0.0031 1.3995 0.0312 0.0697 0.0015 876 17 889 13 920 21 25 197 253 0.78 0.0685 0.0015 0.5141 0.0124 0.0544 0.0013 427 9 421 8 388 24 26 112 234 0.48 0.1671 0.0035 1.6239 0.0351 0.0705 0.0015 996 19 980 14 943 20 27 156 247 0.63 0.1294 0.0027 1.1753 0.0262 0.0659 0.0014 785 16 789 12 802 21 28 88 137 0.64 0.0738 0.0016 0.5702 0.0157 0.0561 0.0015 459 9 458 10 455 28 29 95 140 0.68 0.1822 0.0039 1.8912 0.0432 0.0753 0.0017 1079 21 1078 15 1077 21 30 68 112 0.61 0.3905 0.0082 7.1045 0.1491 0.1320 0.0027 2125 38 2125 19 2125 17 表 7 秦岭造山带凤县–山阳地区钠长角砾岩(GD1) LA-ICP-MS锆石U-Pb同位素测试结果(续)
Table 7. LA-ICP-MS zircon U-Pb isotope results of albite breccia (GD1) in Fengxian-Shanyang area, Qinling Orogenic Belt
点号 含量(10−6) Th/U 同位素比值 年龄(Ma) Th U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 56 126 0.45 0.1368 0.0029 1.2639 0.0294 0.0670 0.0015 826 16 830 13 836 22 2 184 344 0.53 0.0717 0.0015 0.5571 0.0128 0.0563 0.0013 446 9 450 8 465 23 4 217 627 0.35 0.0656 0.0014 0.5048 0.0110 0.0558 0.0012 410 8 415 7 443 22 5 119 191 0.62 0.0754 0.0016 0.5726 0.0142 0.0551 0.0013 468 10 460 9 415 25 6 94 74 1.27 0.1132 0.0024 0.9821 0.0265 0.0629 0.0017 691 14 695 14 705 26 7 73 408 0.18 0.1271 0.0027 1.1638 0.0255 0.0664 0.0014 771 15 784 12 818 21 8 148 220 0.67 0.1327 0.0028 1.2069 0.0271 0.0659 0.0014 803 16 804 12 804 21 9 758 1523 0.50 0.0648 0.0014 0.4879 0.0103 0.0546 0.0011 405 8 403 7 396 22 10 219 225 0.97 0.0861 0.0018 0.6650 0.0160 0.0560 0.0013 533 11 518 10 452 24 11 198 338 0.59 0.0721 0.0015 0.5465 0.0126 0.0550 0.0012 449 9 443 8 411 23 12 156 174 0.90 0.3507 0.0074 5.3225 0.1124 0.1100 0.0022 1938 35 1872 18 1800 18 13 348 438 0.80 0.0687 0.0015 0.5168 0.0118 0.0546 0.0012 428 9 423 8 396 23 14 413 617 0.67 0.0649 0.0014 0.4862 0.0107 0.0543 0.0012 405 8 402 7 385 22 15 137 171 0.80 0.1005 0.0022 0.8851 0.0234 0.0639 0.0017 617 13 644 13 739 25 17 784 1458 0.54 0.0636 0.0013 0.4875 0.0106 0.0557 0.0012 397 8 403 7 438 22 18 183 274 0.67 0.0685 0.0015 0.5484 0.0136 0.0581 0.0014 427 9 444 9 532 24 19 113 422 0.27 0.1088 0.0023 0.9217 0.0206 0.0615 0.0013 665 13 663 11 656 21 21 62 85 0.73 0.1604 0.0035 1.4469 0.0363 0.0655 0.0016 959 19 909 15 790 24 22 1028 760 1.35 0.1525 0.0033 1.5058 0.0325 0.0717 0.0015 915 18 933 13 976 20 23 186 341 0.55 0.0645 0.0014 0.5122 0.0127 0.0577 0.0014 403 8 420 9 517 24 24 58 243 0.24 0.2006 0.0043 2.1910 0.0487 0.0793 0.0017 1179 23 1178 16 1178 20 25 98 96 1.02 0.3209 0.0069 4.8741 0.1106 0.1102 0.0024 1794 34 1798 19 1803 19 26 361 441 0.82 0.0667 0.0014 0.5240 0.0125 0.0570 0.0013 416 9 428 8 491 24 27 127 260 0.49 0.1439 0.0031 1.3267 0.0303 0.0669 0.0014 867 17 857 13 835 21 28 96 366 0.26 0.1624 0.0035 1.6094 0.0363 0.0719 0.0015 970 19 974 14 984 21 30 443 421 1.05 0.0758 0.0016 0.5873 0.0139 0.0563 0.0013 471 10 469 9 463 23 表 8 秦岭造山带凤县–山阳地区钠长角砾岩(KD1) LA-ICP-MS锆石U-Pb同位素测试结果
Table 8. LA-ICP-MS zircon U-Pb isotope results of albite breccia (KD1) in the Fengxian-Shanyang area, Qinling Orogenic Belt
点号 含量(10−6) Th/U 同位素比值 年龄(Ma) Th U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 23 62 0.37 0.1416 0.0031 1.3098 0.0362 0.0671 0.0018 854 17 850 16 840 27 2 54 74 0.73 0.1340 0.0029 1.1976 0.0304 0.0648 0.0016 810 16 799 14 769 24 3 227 275 0.82 0.1341 0.0028 1.1684 0.0254 0.0632 0.0013 811 16 786 12 714 21 5 304 619 0.49 0.0711 0.0015 0.5294 0.0114 0.0540 0.0011 443 9 431 8 371 22 6 87 228 0.38 0.1401 0.0030 1.2497 0.0272 0.0647 0.0014 845 17 823 12 765 21 7 120 188 0.64 0.3418 0.0072 5.4720 0.1121 0.1161 0.0023 1895 34 1896 18 1898 17 8 126 187 0.67 0.0710 0.0015 0.5230 0.0129 0.0535 0.0013 442 9 427 9 348 25 9 251 299 0.84 0.0717 0.0015 0.5528 0.0127 0.0559 0.0013 447 9 447 8 449 23 10 65 187 0.35 0.3086 0.0065 4.5133 0.0931 0.1061 0.0021 1734 32 1733 17 1734 17 11 747 1675 0.45 0.0598 0.0013 0.4929 0.0102 0.0598 0.0012 375 8 407 7 596 21 12 584 751 0.78 0.0600 0.0013 0.4656 0.0099 0.0564 0.0012 375 8 388 7 466 21 13 461 295 1.56 0.1798 0.0037 1.8531 0.0379 0.0748 0.0015 1066 20 1065 13 1063 19 14 66 181 0.37 0.0710 0.0015 0.5083 0.0122 0.0520 0.0012 442 9 417 8 284 25 15 382 841 0.45 0.0620 0.0013 0.4530 0.0093 0.0530 0.0011 388 8 379 7 331 21 16 172 106 1.63 0.1272 0.0027 1.1400 0.0272 0.0651 0.0015 772 15 772 13 777 22 17 186 334 0.56 0.0711 0.0015 0.5207 0.0116 0.0532 0.0012 443 9 426 8 336 23 18 97 128 0.76 0.1275 0.0027 1.1041 0.0249 0.0629 0.0014 774 15 755 12 704 21 19 155 118 1.31 0.1303 0.0027 1.1732 0.0290 0.0654 0.0016 790 16 788 14 786 23 20 64 162 0.40 0.1320 0.0027 1.1953 0.0271 0.0658 0.0015 799 16 798 13 799 21 21 258 409 0.63 0.0707 0.0015 0.5306 0.0113 0.0545 0.0012 440 9 432 8 391 22 22 181 193 0.94 0.3518 0.0072 5.5621 0.1096 0.1148 0.0022 1943 34 1910 17 1876 17 23 260 238 1.10 0.0699 0.0015 0.5843 0.0137 0.0607 0.0014 435 9 467 9 629 22 24 142 224 0.63 0.0712 0.0015 0.5262 0.0120 0.0537 0.0012 443 9 429 8 357 23 25 291 494 0.59 0.0663 0.0014 0.4877 0.0104 0.0534 0.0011 414 8 403 7 346 22 27 213 357 0.60 0.0660 0.0014 0.4813 0.0108 0.0530 0.0012 412 8 399 7 328 23 28 92 268 0.35 0.0770 0.0016 0.5889 0.0128 0.0555 0.0012 478 9 470 8 434 22 30 90 874 0.10 0.1312 0.0027 1.1879 0.0229 0.0657 0.0013 795 15 795 11 797 19 表 9 秦岭造山带凤县–山阳地区钠长角砾岩(TD2) LA-ICP-MS锆石U-Pb同位素测试结果
Table 9. LA-ICP-MS zircon U-Pb isotope results of albite breccia (TD2) in the Fengxian-Shanyang area, Qinling Orogenic Belt
点号 含量(10−6) Th/U 同位素比值 年龄(Ma) Th U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 529 578 0.91 0.0766 0.0017 0.6015 0.0139 0.0568 0.0012 476 10 478 9 485 23 2 251 421 0.60 0.1485 0.0033 1.3590 0.0302 0.0663 0.0014 892 18 871 13 816 21 3 115 153 0.76 0.3581 0.0079 5.9835 0.1314 0.1210 0.0025 1 973 37 1 973 19 1 971 18 4 205 362 0.57 0.0754 0.0017 0.5792 0.0135 0.0557 0.0012 469 10 464 9 438 23 5 228 434 0.52 0.1391 0.0030 1.2805 0.0285 0.0667 0.0014 839 17 837 13 829 21 6 347 619 0.56 0.0759 0.0017 0.5753 0.0130 0.0550 0.0012 471 10 461 8 410 23 7 163 309 0.53 0.0727 0.0017 0.6378 0.0350 0.0636 0.0038 453 10 501 22 728 130 8 77 280 0.28 0.0827 0.0018 0.6290 0.0149 0.0551 0.0012 512 11 495 9 417 24 9 91 54 1.70 0.1362 0.0030 1.2288 0.0342 0.0654 0.0018 823 17 814 16 789 27 10 89 196 0.46 0.0749 0.0016 0.5542 0.0139 0.0537 0.0013 465 10 448 9 358 25 12 167 134 1.25 0.4353 0.0094 9.0028 0.1905 0.1500 0.0030 2329 42 2338 19 2346 17 13 999 1413 0.71 0.1213 0.0026 1.1826 0.0249 0.0707 0.0014 738 15 793 12 950 20 14 472 327 1.45 0.1208 0.0026 1.1029 0.0245 0.0663 0.0014 735 15 755 12 815 21 15 241 223 1.08 0.1559 0.0034 1.5069 0.0351 0.0701 0.0016 934 19 933 14 932 21 16 142 176 0.80 0.4841 0.0103 11.2773 0.2343 0.1690 0.0033 2545 45 2546 19 2548 16 18 88 180 0.49 0.1334 0.0029 1.1894 0.0267 0.0647 0.0014 807 16 796 12 765 21 19 81 129 0.63 0.2189 0.0047 2.4741 0.0544 0.0820 0.0017 1276 25 1264 16 1246 19 20 129 311 0.42 0.0751 0.0016 0.5837 0.0139 0.0564 0.0013 467 10 467 9 469 24 22 399 639 0.63 0.1180 0.0025 1.0309 0.0214 0.0635 0.0013 719 14 719 11 723 20 23 120 128 0.94 0.1056 0.0026 0.9097 0.0716 0.0625 0.0052 647 15 657 38 691 182 24 165 259 0.64 0.2622 0.0055 3.3808 0.0697 0.0936 0.0019 1501 28 1500 16 1500 18 25 132 161 0.82 0.0726 0.0015 0.5595 0.0143 0.0560 0.0014 452 9 451 9 450 26 28 218 223 0.97 0.4562 0.0095 9.9484 0.1992 0.1584 0.0031 2423 42 2430 18 2439 16 30 76 98 0.78 0.1176 0.0025 1.0093 0.0293 0.0623 0.0018 717 15 709 15 685 29 -
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