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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (4): 465-472.doi: 10.11872/j.issn.1005-2518.2018.04.465

• • 上一篇    下一篇

东昆仑小灶火地区钼矿化正长花岗岩年代学、地球化学特征及其地质意义

陈静(),胡继春,逯永卓,卢世银,王树林,徐贝贝   

  1. 1青海省地质调查院,青海省青藏高原北部地质过程与矿产资源重点实验室,青海 西宁 810012
  • 收稿日期:2018-03-06 修回日期:2018-05-23 出版日期:2018-10-10 发布日期:2018-10-17
  • 作者简介:陈静(1982-),女,浙江嵊州人,高级工程师,从事地质矿产科研工作。chenjing198231@163.com
  • 基金资助:
    青海省基础应用研究项目“东昆仑东段地区银多金属矿成矿规律及靶区优选”资助(2016-ZJ-719)

Geochronology,Geochemical Characteristics of Molybdenum Ore-bearing Syenogranite from Xiaozhaohuo Area in East Kunlun and Its Geological Significance

Jing CHEN(),Jichun HU,Yongzhuo LU,Shiying LU,Shulin WANG,Beibei XU   

  1. 1Qinghai Geological Survey Institue,The Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources Laboratory,Xining 810012,Qinghai,China
  • Received:2018-03-06 Revised:2018-05-23 Online:2018-10-10 Published:2018-10-17

摘要:

小灶火地区位于昆中岩浆弧北缘,北部与祁漫塔格弧后盆地区相邻,属于拉陵灶火整装勘查区众多铜钼多金属矿(化)点之一,该区含钼岩体为正长花岗岩。采用LA-ICP-MS锆石U-Pb法测得小灶火地区含矿正长花岗岩形成年龄为(226±1)Ma,形成于晚三叠世Carnian期。岩石地球化学分析结果显示,岩石明显具有富硅钾的特点,属高钾钙碱性系列,具有较弱的Eu负异常(0.75~0.86),Nb、Ta、Ti、P、Ba等元素亏损,Rb、Th、U、K等元素富集,Rb/Sr比值平均为1.90,Nb/Ta比值平均为11.33,上述特征均反映了岩石的壳源成因。结合区域上该期的火成岩岩石组合判断小灶火地区成岩成矿背景为晚三叠世后碰撞陆内造山阶段,与整个东昆仑造山带晚三叠世强烈壳—幔相互作用大背景相一致。

关键词: 正长花岗岩, 锆石U-Pb年龄, 岩石地球化学, 后碰撞阶段, 钼多金属矿, 小灶火, 东昆仑

Abstract:

Xiaozaohuo area is located in the northern region of the Middle Kunlun magmatic arc,next to the Qimantage back-arc basin in the north,which is one of the large number of copper molybdenum polymetallic mineralized points in Lalingzaohuo monoblock exploration area.The ore-bearing intrusion is syenogranite.Detailed studies on geochronology,element geochemical were carried out for the syenogranite.The results show that the age of syenogranite is (226±1)Ma,geochemical analysis show that it belongs to shoshonitic series,with weaker Eu negative anomaly (0.75~0.86),depleted of Nb,Ta,Ti,P,Ba,rich in Rb,Th,U,K;Rb/Sr ratios of 1.90 on average,Nb/Ta ratios of 11.33 on average,these characteristics are reflected the crust sources of the magma genesis.Combined with studies of igneous diagenetic assemblages in this area,this paper proposed that the diagenetic mineralization setting in Xiaozaohuo area is post-collision intracontinental orogenic stage in the late Triassic.

Key words: syenogranite, zircon U-Pb age, geochemistry, post-collision stage, molybdenum polymetallic ore, Xiaozaohuo, east Kunlun

中图分类号: 

  • P618.65

图1

东昆仑小灶火地区地质简图 Q-第四系:冲积物(al)、冲洪积物(pal)和风积物(eol);T3e-晚三叠世鄂拉山组碎屑岩;C1dg-早石炭世大干沟组碳酸盐岩;ξγT3-晚三叠世正长花岗岩;δοP1-早二叠世石英闪长岩;1.整合地质界线;2.角度不整合地质界线;3.逆断层;4.性质不明断层;5.岩层产状;6.钼矿化体;7.U-Pb同位素测年样品采集位置"

图2

小灶火地区含钼正长花岗岩宏观(a)及手标本(b)照片"

图3

正长花岗岩(XZHJD1)阴极发光图像"

小灶火地区含矿正长花岗岩(XZHJD1)锆石LA-ICP-MS U-Pb同位素测试数据"

测点编号 含量(×10-6)及比值 同位素比值及误差 年龄及误差
238U 232Th 232Th/238U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 206Pb/238U 1σ
1 326.94 216.73 0.66 0.05793 0.00263 0.2854 0.01240 0.03572 0.00042 226 3
2 374.34 208.12 0.56 0.05433 0.00383 0.26757 0.01830 0.03571 0.00062 226 4
3 395.31 189.35 0.48 0.05925 0.00201 0.29372 0.00939 0.03595 0.00032 228 2
4 359.78 266.71 0.74 0.04898 0.00168 0.24110 0.00783 0.03570 0.00030 226 2
5 693.50 440.25 0.63 0.04605 0.00277 0.22469 0.01305 0.03539 0.00054 224 3
6 657.32 359.52 0.55 0.06043 0.00269 0.29869 0.01271 0.03584 0.00042 227 3
7 490.92 350.41 0.71 0.05873 0.00649 0.28267 0.03074 0.03491 0.00070 221 4
8 517.31 357.25 0.69 0.05016 0.00178 0.24696 0.00832 0.03571 0.00031 226 2
9 527.93 336.54 0.64 0.05116 0.00126 0.25231 0.00566 0.03576 0.00023 226 1
10 523.05 279.68 0.53 0.05250 0.00207 0.25912 0.00975 0.03579 0.00035 227 2
11 347.92 251.36 0.72 0.05393 0.00163 0.26560 0.00746 0.03571 0.00028 226 2
12 836.68 729.23 0.87 0.05047 0.00353 0.24607 0.01674 0.03536 0.00057 224 4
13 436.40 307.08 0.70 0.05415 0.00305 0.26383 0.01465 0.03534 0.00036 224 2
14 607.12 159.45 0.26 0.05286 0.00246 0.26142 0.01166 0.03586 0.00041 227 3
15 540.32 330.61 0.61 0.06155 0.00294 0.30362 0.01392 0.03577 0.00045 227 3
16 617.61 346.15 0.56 0.06802 0.00321 0.32634 0.01502 0.03480 0.00035 220 2

图4

小灶火地区正长花岗斑岩锆石U-Pb年龄谐和图"

图5

A/NK-A/CNK 分类图解(a)和SiO2-K2O图解(b)"

表2

正长花岗岩主量、稀土微量元素含量及参数特征"

元素 样品编号及元素含量
样品一 样品二 样品三 样品四
SiO2 73.51 73.02 77.20 77.36
TiO2 0.30 0.28 0.09 0.09
Al2O3 13.82 13.77 12.18 11.98
Fe2O3 0.96 1.44 0.64 0.66
FeO 0.77 0.71 0.35 0.38
MnO 0.044 0.042 0.03 0.02
MgO 0.58 0.34 0.19 0.21
CaO 0.86 0.94 0.74 0.75
Na2O 3.29 3.63 3.53 3.42
K2O 4.6 4.96 4.6 4.59
P2O5 0.08 0.066 0.01 0.02
H2O+ 1.14 0.68 0.48 0.80
LOS 0.61 0.17 0.26 0.20
A/CNK 1.156 1.055 1.004 1.002
La 34.5 30.7 23.4 20.8
Ce 61.93 62.04 52.06 43.34
Pr 8.83 7.45 6.03 5.20
Nd 25.90 24.70 20.70 17.30
Sm 4.94 4.27 3.66 3.01
Eu 1.08 1.03 0.83 0.79
Gd 3.62 3.62 2.82 2.48
Tb 0.57 0.54 0.38 0.37
Dy 2.59 2.78 1.70 1.83
Ho 0.59 0.58 0.31 0.35
Er 1.31 1.23 1.542 1.282
Tm 0.25 0.29 0.12 0.15
Yb 1.49 1.93 0.72 0.96
Lu 0.25 0.32 0.11 0.15
Rb 1 90 1 61 203.2 214.3
Ba 897 887 359.1 450.8
Th 8.94 25.00 16.23 16.72
Ta 0.76 1.24 1.633 1.333
Nb 10.60 12.50 16.92 14.57
Hf 4.05 4.89 2.931 2.728
Zr 148 166 72.98 70.65
Sm 4.13 3.79 4.272 3.198
Y 13.00 12.10 16.27 13.81
Sr 206 345 63.82 70.47
ΣREE 147.85 141.48 114.38 98.01
(La/Yb)N 16.61 11.41 23.31 15.54
σEu 0.75 0.78 0.76 0.86

图6

球粒陨石标准化REE配分型式(a)和原始地幔标准化微量元素蛛网图(b) 球粒陨石标准化值来自Boynton[14];原始地幔标准化值来自Sun and Medonough[15]"

图7

小灶火地区样品Y-Nb(a)和R1-R2(b)图解(底图据Batchlor等[17]) VAG-火山弧花岗岩;ORG-洋中脊花岗岩;WPG-板内花岗岩;Syn-COLG-同碰撞花岗岩"

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