东昆仑战红山地区花岗斑岩LA-ICP-MS锆石U-Pb测年及岩石地球化学特征

李积清; 张鑫利; 王涛; 李青; 王泰山; 薛万文

doi:10.19751/j.cnki.61-1149/p.2021.01.003

东昆仑战红山地区花岗斑岩LA-ICP-MS锆石U-Pb测年及岩石地球化学特征

青海省地质调查院, 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

基金项目:

青海省应用基础研究项目“青海省布青山地区金多金属成矿作用及找矿方向研究”（2018-ZJ-733、2018-SF-109），青海省省级财政勘查资金“青海省坑得弄舍-苦海地区金多金属矿成矿规律研究与靶区优选”项目（青国土资[2017]189号）

详细信息

作者简介:
李积清(1985-),男,青海乐都人,高级工程师,从事区域地质调查及矿产勘查工作。E-mail:lijiqing8999@163.com

通讯作者:
张鑫利(1987-),男,宁夏同心人,工程师,从事区域地质调查及矿产勘查工作。E-mail:317558467@qq.com

中图分类号: P595
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出版历程
- 收稿日期: 2020-04-09
- 修回日期: 2020-10-15
- 网络出版日期: 2022-07-28
- 发布日期: 2021-03-04

Zircon U-Pb Dating and Geochemical Characteristics of Granite Porphyry in Zhanhongshan Area, East Kunlun

Qinghai Geological Survey Institute, Key Laboratory of Geological Processes and Mineral Resources in Northern Qinghai-Tibet Plateau, Xining 810012, Qinghai, China

摘要

摘要: 在野外调查的基础上，对东昆仑战红山地区花岗斑岩通过锆石U-Pb测年和地球化学研究，获得花岗斑岩成岩年龄为（243.4±1.5）Ma（MSWD=0.99），属中三叠世。岩石地球化学特征显示岩石SiO₂为73.82%~75.65%，K₂O/Na₂O=0.61~0.95，相对富钠，贫MnO（0.05%~0.06%）、P₂O₅（0.05%）和TiO₂（0.17%~0.2%），A/CNK值为1~1.09，平均为1.053，Al₂O₃为12.02%~13.12%，里特曼指数δ值为1.61~1.89，TFeO/MgO为2.44~2.54，DI为91.2~92.64，表明其为过铝质、钙碱性岩系列的高分异I型花岗岩。岩石稀土总量较低（ΣREE=134.89×10^-6~165.65×10^-6），LREE/HREE=7.99~8.85，（La/Yb）_N=9.9~11.21，轻重稀土分馏明显，表现出轻稀土富集而重稀土亏损的右倾曲线。δEu为0.58~0.66，岩石具大离子亲石元素Rb、Ba及高场强元素U、Th、Pb相对富集，K、P、Ti相对亏损特征。结合岩石成岩年龄、地球化学特征以及区域构造演化，认为其形成于古特提斯洋向北俯冲的碰撞环境。
- 花岗斑岩 /
- 锆石U-Pb测年 /
- 中三叠世 /
- 东昆仑 /
- 战红山
Abstract: Based on the field investigation of granite porphyry in Zhanhongshan area of East Kunlun, zircon U-Pb dating and geochemical study show that the granite porphyry has a diagenetic age of (243.4 ±1.5) Ma (MSWD=0.99), belonging to the Middle Triassic. The geochemical characteristics of the rocks show that the SiO₂ ranges from 73.82% to 75.65%, K₂O/Na₂O=0.61-0.95, relatively rich in sodium, poor in MnO (0.05%~0.06%), P₂O₅ (0.05%) and TiO₂ (0.17%~0.2%). The A/CNK value is 1~1.09, with an average of 1.053. Al₂O₃ is between 12.02%~13.12%. The values of δ are 1.61~1.89. TFeO/MgO is 2.44~2.54 and DI is 91.2~92.64. All these show that it is a highly fractionated I-type granite of peraluminous and calc-alkaline series. The total REE content of the rocks is low (∑REE=134.89×10^-6~165.65×10^-6), LREE/HREE=7.99~8.85, (La/Yb)_N=9.9~11.21. The fractionation of LREE and HREE is obvious, showing a right dipping curve of LREE enrichment and HREE depletion.δEu is 0.58~0.66. The rocks are characterized by a relative enrichment of large ion lithophiles of Rb, Ba and high field strength elements of U, Th, Pb, whereas a depletion of K, P and Ti. Combined with the diagenetic age, geochemical characteristics and regional tectonic evolution,the authors hold that the rocks formed in the collision environment of the northward subduction of the PaleoTethys ocean.
- granite porphyry /
- zircon U-Pb dating /
- the Middle Triassic /
- East Kunlun /
- Zhanhongshan

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