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黄金科学技术 ›› 2020, Vol. 28 ›› Issue (1): 1-11.doi: 10.11872/j.issn.1005-2518.2020.01.128

• 矿产勘查与资源评价 •    下一篇

滇西保山地块黑牛凹金矿区辉绿玢岩地球化学特征、锆石U-Pb年龄及地质意义

罗应1(),卢映祥2,刘学龙1(),薛顺荣2,王帅帅1,李振焕1,张昌振1,陈建航1   

  1. 1.昆明理工大学国土资源工程学院,云南 昆明 650093
    2.自然资源部三江成矿作用及资源勘查利用重点实验室,云南 昆明 650051
  • 收稿日期:2019-07-08 修回日期:2019-10-08 出版日期:2020-02-29 发布日期:2020-02-26
  • 通讯作者: 刘学龙 E-mail:52938746@qq.com;xuelongliu@foxmail.com
  • 作者简介:罗应(1992-),男,贵州安顺人,硕士研究生,从事矿床地质研究工作。52938746@qq.com
  • 基金资助:
    云南省科学技术奖“杰出贡献奖”项目“西南三江复合成矿作用疑难问题研究”(2017001);云南省基础研究计划项目“滇西北中甸铜厂沟燕山期斑岩型Mo-Cu矿床热液蚀变分带与成矿流体研究”(2019FB062);云南省万人计划“青年拔尖人才”专项(20190028);昆明理工大学重点学科建设经费项目“地质资源与地质工程(省级一流学科)”(1407839305)

Geochemical Characteristics,Zircon U-Pb Age and Geochronological Significance of Diabase in Heiniu’ao Gold Deposit,Baoshan Block,Western Yunnan

Ying LUO1(),Yingxiang LU2,Xuelong LIU1(),Shunrong XUE2,Shuaishuai WANG1,Zhenhuan LI1,Changzhen ZHANG1,Jianhang CHEN1   

  1. 1.Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China
    2.Key Laboratory of Sanjiang Mineralization and Resource Exploration and Utilization,Ministry of Land and Resources,Kunming 650051,Yunnan,China
  • Received:2019-07-08 Revised:2019-10-08 Online:2020-02-29 Published:2020-02-26
  • Contact: Xuelong LIU E-mail:52938746@qq.com;xuelongliu@foxmail.com

摘要:

通过对保山地块黑牛凹金矿区内辉绿玢岩进行LA-ICP-MS原位微区锆石U-Pb定年和岩石地球化学特征分析,获得了辉绿玢岩的成岩年龄为(212.0±4.9) Ma,这一时限与核桃坪矿区内辉绿玢岩成岩时限(195.0±5.3) Ma,以及金厂河矿区辉绿玢岩成岩时限(217.3±5.8) Ma具有一致性,均属晚三叠世。黑牛凹辉绿玢岩具有低SiO2、低MgO及高钾特征,属于钾玄系列。微量元素具有富集轻稀土元素(LREE)、大离子亲石元素(LILE)及亏损高场强元素(HFSE)的特征,暗示其源区为岩石圈地幔。岩石中的Cr、Ni元素含量明显比原始玄武岩浆低,表明岩浆可能经历了橄榄石和辉石的结晶分离作用。Nb、Ta元素具明显负异常,暗示在岩浆上升侵位过程中受到了地壳物质的混染。黑牛凹辉绿玢岩形成的构造背景与区域内金厂河辉绿岩、核桃坪辉绿岩一致,均为板内拉张环境,这可能与古特提斯洋闭合导致保山地块因碰撞而发生的内部拉张、伸展活动有关。

关键词: 辉绿玢岩, 锆石U-Pb定年, 地球化学特征, 晚三叠世, 板内拉张环境, 滇西

Abstract:

The special geotectonic location of Baoshan block makes it undergo a series of Tethys evolutionary activities with frequent regional tectonic-magmatic activities.Granite is developed from Paleozoic to Cenozoic.In addition,a large number of basic intrusive rocks occurring as dikes and dikes are also developed in the region.Previous research and analysis of granite in the region is relatively systematic,but the study and analysis of basic rocks in the region,especially basic dikes commonly developed in typical polymetallic ore areas in the ore concentration area,is relatively weak.Previous studies and analyses only the chronology of diabase and its relationship with mineralization in the Hetaoping lead-zinc polymetallic ore area.The study and analysis of the petrogenesis of basic rocks is almost blank.Therefore,the diabase porphyrite in typical boreholes of Heiniu’ao gold deposit has been systematically analyzed in terms of petrochemical characteristics and zircon U-Pb dating in LA-ICP-MS in situ.The main elements of Heiniu’ao diabase porphyry are characterized by low SiO2,low TiO2,high Al2O3,low MgO,high FeOT and low K2O,belonging to the shoshonite series.Trace and rare earth elements are characterized by enrichment of light rare earth elements (LREE) and large ion lithophile elements (LILE) and depletion of high field strength elements(HFSE),suggesting that their source areas are lithospheric mantle.The content of Cr and Ni in the rocks is obviously lower than that in the original basalt magma,indicating that the magma may have undergone the crystallization separation of olivine and pyroxene.The obvious negative anomalies of Nb and Ta suggest that they were contaminated by crustal materials during the process of magma emplacement.The tectonic environment is consistent with the tectonic background of Jinchanghe diabase and Hetaoping diabase,which are intraplate extensional environments.The diagenetic age of the diabase porphyrite obtained in the mining area is (212.0±4.9) Ma,which is similar to the diagenetic age of the Hetaoping diabase obtained by predecessors (195.0±5.3) Ma,and that of the Jinchanghe diabase (217.3±5.8) Ma are all Late Triassic.It shows that the basic dikes in the area are the products of the Triassic magmatic activities.The closure of the Triassic Paleo-Tethyan Ocean resulted in the collision between Baoshan and Simao blocks,which resulted in extensional activities in Baoshan block.The basalt magma originating from the mantle emplaced upward along the weak tectonic zone to form diabase porphyrite of this time limit,and experienced crystallization differentiation and crustal contamination during the process of magma emplacement.

Key words: diabase porphyrite, zircon U-Pb dating, geochemistry, Late-Triassic, intraplate extensional environment, Western Yunnan

中图分类号: 

  • P618.51

图1

黑牛凹金矿区地质简图(据杨怀[21]修改)1.第四纪洪坡积物;2.沙河厂组下段一层:灰色大理岩化灰岩;3.核桃坪组中段三层:灰绿色粉砂质板岩;4.核桃坪组中段二层:浅灰色泥质灰岩;5.核桃坪组中段一层:灰绿色粉砂质板岩;6.核桃坪组下段:灰绿色粉砂质板岩;7.辉绿玢岩;8.灰岩透镜体;9.断层及编号;10.构造蚀变带;11.金矿体;12.采样位置"

图2

黑牛凹金矿区18线地质剖面图1.第四系残坡积物;2.上寒武统核桃坪组上段钙质板岩;3.辉绿玢岩;4.蚀变带;5.金矿体;6.探槽;7钻孔"

图3

黑牛凹金矿区辉绿玢岩手标本(a)与显微照片(b)Py-黄铁矿;Pl-斜长石;Aug-辉石;Ab-角闪石;Ep-绿帘石;Hb-角闪石"

表1

黑牛凹金矿区辉绿玢岩主量和微量元素特征"

样品编号岩性主量元素及含量/%
SiO2TiO2Al2O3Fe2O3TMgOCaONa2OK2OMnOP2O5LOITotal
HNA7-02-1辉绿玢岩49.061.4315.5911.454.967.191.882.730.180.164.8599.48
HNA7-02-2辉绿玢岩48.971.4215.6611.464.937.211.852.750.180.174.8599.45
HNA7-09辉绿玢岩48.951.4715.9311.244.706.492.102.700.170.165.5599.46
HNA7-10辉绿玢岩48.921.4515.8011.334.976.992.052.310.180.165.3099.46
JCH辉绿岩48.431.7114.8811.786.599.632.980.080.300.203.38100.21
HTP辉绿岩48.621.3414.2211.635.749.151.772.990.480.143.3899.46
样品编号岩性微量元素及含量/(×10-6)
RbBaThUTaNbSrZrHfCrCuPb
HNA7-02-1辉绿玢岩112.06973.410.601.0512.338968.12.2374.51306.48
HNA7-02-2辉绿玢岩109.06733.280.630.9211.737966.32.0675.01286.07
HNA7-09辉绿玢岩117.08853.141.170.9911.933159.91.8965.01247.26
HNA7-10辉绿玢岩87.305293.390.580.8912.033860.11.9871.71045.50
JCH辉绿岩1.34293.540.681.6028.439749.11.75153.0334.00
HTP辉绿岩90.055103.360.620.7110.9342237.351.88176.0129.3522.16
样品编号岩性微量元素及含量/(×10-6)
ZnNiCoLaCePrNdSmEuGdTbDy
HNA7-02-1辉绿玢岩105.045.441.016.833.14.4319.14.741.384.751.026.04
HNA7-02-2辉绿玢岩100.044.839.716.032.34.2118.54.471.324.620.995.89
HNA7-09辉绿玢岩100.038.936.915.631.54.1317.94.421.264.440.955.79
HNA7-10辉绿玢岩93.841.738.816.532.94.3218.74.561.154.580.945.88
JCH辉绿岩124.058.238.619.738.14.8017.54.411.524.250.874.78
HTP辉绿岩205.867.646.915.132.84.0918.94.921.445.560.935.92
样品编号岩性微量元素及含量/(×10-6)

LREE/

HREE

(La/Yb)NδEu
HoErTmYbLuYΣREELREEHREE
HNA7-02-1辉绿玢岩1.222.950.583.220.4032.599.7379.5520.183.943.740.88
HNA7-02-2辉绿玢岩1.192.910.563.090.3930.496.4476.819.643.913.710.88
HNA7-09辉绿玢岩1.162.840.543.020.3830.593.9374.8119.123.913.710.86
HNA7-10辉绿玢岩1.212.930.553.020.3831.997.6278.1319.494.013.920.76
JCH辉绿岩0.952.670.412.250.2925.1102.4585.9916.465.226.281.06
HTP辉绿岩1.113.070.402.350.3229.496.8977.2319.663.930.84

图4

黑牛凹金矿区辉绿玢岩TAS图解(a)及SiO2-K2O图解(b)"

图5

黑牛凹金矿区辉绿玢岩的稀土元素配分模式图(a)和原始地幔标准化微量元素蛛网图(b)(底图据Sun等[29])"

表2

黑牛凹金矿区辉绿玢岩LA-ICP-MS锆石U-Pb年龄"

分析点元素含量/(×10-6Th/U比值年龄
总PbThU207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ
HNA7-06-0361.46368.65397.440.930.05620.00300.26520.01400.03430.0007461.16115.73238.8711.27217.684.23
HNA7-06-0445.00252.52324.240.780.05280.00370.24240.01440.03430.0007320.43162.02220.4011.81217.614.55
HNA7-06-08119.74693.92759.570.910.05350.00270.24970.01220.03400.0006350.06114.80226.359.90215.733.82
HNA7-06-1128.19145.00805.000.180.04820.00210.22230.00990.03300.0004200.0868.46203.798.22209.222.46
HNA7-06-1327.4763.90770 .000.080.04900.00250.22330.01090.03300.0005146.38113.87204.659.09209.532.88

图6

黑牛凹金矿区辉绿玢岩锆石阴极发光(CL)图像和U-Pb同位素分析点位"

图7

黑牛凹辉绿玢岩锆石206Pb/238U-207Pb/235U谐和图"

图8

玄武岩构造环境判别FeOT-MgO-Al2O3图解(a)(底图据Pearce等[38])和玄武岩构造环境判别Th/Hf-Ta/Hf图解(b)(底图据汪云亮等[39])"

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