东准噶尔卡拉麦里辉长岩斜锆石U-Pb年代学及其构造意义

于漫; 第鹏飞

doi:10.11872/j.issn.1005-2518.2019.05.678

黄金科学技术 >

2019 , Vol. 27 >Issue 5: 678 - 686

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.05.678

矿产勘查与资源评价

东准噶尔卡拉麦里辉长岩斜锆石U-Pb年代学及其构造意义

于漫 ^,¹ ,
第鹏飞 ²

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1. 甘肃省国土资源规划研究院，甘肃兰州 730000
2. 甘肃省矿产资源储量评审中心，甘肃兰州 730000

于漫（1973-），女，吉林伊通人，工程师，从事矿产与土地资源规划工作。379804002@qq.com

收稿日期: 2018-10-29

修回日期: 2019-04-29

网络出版日期: 2019-11-07

基金资助

国家自然科学基金项目“东昆仑造山带夏日哈木岩浆铜镍硫化物矿床成矿机制的流体组成

多元同位素制约”(41872073)

“峨眉山大火成岩省钒钛磁铁矿矿床成矿机制的流体组成制约”(41472070)

甘肃省科技计划项目“金川铜镍硫化物矿床成矿过程Mg-Sr-Nd-Hf-O同位素组成示踪”(18JR3RA266)

兰州大学中央高校基本科研业务费专项资金“金川Ni-Cu硫化物矿床成矿过程的Mg同位素组成示踪”(lzujbky-2017-77)

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Baddeleyite U-Pb Geochronology and Tectonic Significance of the Gabbro in Kalamaili, Eastern Junggar

Man YU ^,¹ ,
Pengfei DI ²

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1. Gansu Institute of Land Resources Planning and Research, Lanzhou 730000, Gansu, China
2. Gansu Assessment Center of Mineral Resources Reserves, Lanzhou 730000, Gansu, China

Received date: 2018-10-29

Revised date: 2019-04-29

Online published: 2019-11-07

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本文亮点

卡拉麦里蛇绿岩带是东准噶尔重要的组成部分，该蛇绿岩带沿卡拉麦里山呈NWW向展布，延伸约400 km，主要由橄榄岩、辉长岩、斜长花岗岩和少量的硅质岩组成。选取蛇绿岩带西段呈团块状出露的辉长岩斜锆石进行了LA-ICP-MS锆石 U-Pb 测年得出，辉长岩谐和年龄为（434.4±2.7） Ma（MSWD=0.87），加权平均年龄为（436.4±2.5） Ma（MSWD=0.59），属早志留世。截至目前，该年龄是卡拉麦里蛇绿混杂岩中测得的最早年龄，标志着卡拉麦里洋盆在早志留世就已经开始拉张形成，即在扎河坝—阿尔曼太蛇绿岩所代表的洋盆闭合前，卡拉麦里洋盆就已经存在。

本文引用格式

于漫 , 第鹏飞 . 东准噶尔卡拉麦里辉长岩斜锆石U-Pb年代学及其构造意义[J]. 黄金科学技术, 2019 , 27(5) : 678 -686 . DOI: 10.11872/j.issn.1005-2518.2019.05.678

Highlights

The Kalamaili ophiolite belt is an important component of East Junggar.It extends along the Kalamaili Mountains in NWW direction, extending about 400 km.It is an important tectonic unit in the region. The opening and closing of oceanic separation represented by the ophiolite belt is of great significance to the tectonic evolution of the whole east Junggar region.Previous studies on the age of ophiolite have mainly come from the fossil age of siliceous rocks and the zircon U-Pb age of diabase, gabbro and baddeleyite granite. However,there are few reports on the age of baddeleyite in ophiolite.The Kalamaili ophiolite is mainly composed of peridotite,gabbro,plagiogranite and a small amount of siliceous rock, controlled by the Kalamaili fault, which makes gabbro appear as tectonic block and accompanied by peridotite.Gabbro belongs to the large class of silica-unsaturated rocks. Baddeleyite coexists steadily with pyroxene and olivine, while zircon belongs to silica-saturated, supersaturated minerals and gabbro. The crystallization of baddeleyitee is earlier than that of zircon, which is more representative of the true age of formation of rocks. Therefore, in this study, more than 200 baddeleyite were selected from fresh gabbro exposed in massive form in the western part of ophiolite belt, and 80 of them were selected to make targets and take transparent, reflective and cathodoluminescent photographs.Since baddeleyites are black in the cathodoluminescent photographs, LA-ICP-MS U-Pb dating was carried out at the selected testing sites of the transparent and reflective photographs, and 16 years of good harmony were obtained.Age data ranged from 431 Ma to 444 Ma. The harmonic age of rock ²⁰⁷Pb/²³⁵U-²⁰⁶Pb/²³⁸U is （434.4+2.7）Ma (MSWD=0.87) and the weighted average age of ²⁰⁶Pb/²³⁸U is （436.4+2.5）Ma (MSWD=0.59) calculated by ISOPLOT software. The two ages are consistent within the error range, indicating that the gabbro was formed in early Silurian.Up to now, this age is the earliest one found in the Karamari ophiolitic melange, which indicates that the Karamari oceanic basin began to stretch and form in the early Silurian.That is, the Karamari oceanic basin existed before the closure of the oceanic basin represented by the Zhaheba-Aermantai ophiolite in the north of the basin.

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